Singapore Sole Proprietor Tax Guide 2026

Singapore sole proprietors pay personal income tax on net trade income, not a separate business tax. You work out revenue minus allowable expenses, report the profit to IRAS on a Form B, and pay at the normal individual rates. That is the whole model, and it is simpler than most people expect.

One thing worth clearing up before anything else, because it causes real confusion. For tax purposes, a registered sole proprietor and an unregistered freelancer are treated the same way. Both are self-employed persons. Registering with ACRA gives you a business name and a UEN, which some clients ask for, but it does not create a separate taxpayer and it does not change your rates. If you are searching for sole proprietor tax rules and finding freelancer guides, that is why. This guide covers both.

Do you need to file a tax return?

As a freelancer or sole proprietor you are treated as self-employed. There are two separate triggers here, and missing the second one is the most common mistake people make. You need to file if your total annual income is more than S$22,000, or if your net profit from self-employment is more than S$6,000. That second trigger catches people who assume a small side business is too small to matter to IRAS. Make S$12,000 of profit with no other income and you are under the S$22,000 line but well over the S$6,000 one, so you file. You also file whenever IRAS sends you a notification or paper form, whatever the amounts. Your business income is reported as net trade income, which is your revenue minus your allowable business expenses. If you register as a sole proprietor with ACRA rather than freelancing under your own name, our guide on how invoicing works if you register as a sole proprietor covers what changes on your paperwork.

How is self-employed income taxed?

Singapore taxes individuals on a progressive scale, so the more you earn, the higher the rate on the top slice of your income. The first S$20,000 of chargeable income is taxed at zero percent, and the rates rise in bands from there. Most freelancers sit in the lower and middle bands, which keeps the effective rate modest compared with many countries. Importantly, you are taxed on your profit, not your total invoiced amount, which is why tracking expenses matters so much.

Is income from overseas clients taxable?

Usually yes, and the reason catches a lot of freelancers out. The test is where you did the work, not where your client sits or which currency they paid in.

If you're in Singapore doing the work, that income is Singapore-sourced and taxable, even when the client is in Sydney, the contract is in US dollars, and the money lands in a Wise account. Being paid from abroad does not make income foreign-sourced. This is the single most common misconception among freelancers with international clients, and it's an expensive one to get wrong, because the assumption usually means the income was never declared at all.

The genuine foreign-sourced exemption is narrower than the name suggests. IRAS treats overseas income received in Singapore by resident individuals as generally not taxable, including when it's paid into a Singapore bank account, with the main exception being income received through a partnership in Singapore. But that rule is about income whose source is genuinely outside Singapore. Work performed here doesn't become foreign-sourced because of who paid for it.

So the practical position for most people reading this:

• You're in Singapore, client is overseas. Taxable. Declare it with the rest of your trade income. Currency conversion happens at the rate on the date you received it, and keep the record showing which rate you used.
• You spent an extended period working abroad. This is where it stops being a blog-post question. Source, residency and any tax treaty all start to matter, and the answer depends on specifics.
• You have genuine foreign investment or rental income. Different category from your trade income, and generally exempt for resident individuals outside a partnership.

One habit worth building regardless. Keep the invoice, the contract and the payment record for overseas work in the same place as everything else, and note where the work was performed. If the question ever comes up years later, the thing you'll need is evidence of where you were sitting, and that's much easier to capture at the time than to reconstruct.

If a meaningful share of your income is cross-border, or you're splitting your year between countries, this is worth twenty minutes with a tax adviser rather than a guess. The cost of getting it wrong compounds quietly across years.

What if an overseas client deducts tax before paying you?

You invoice 5,000 and 4,500 arrives. Nothing has gone wrong with the transfer. Your client's country made them withhold tax at source on the service fee before the money ever left, and that missing slice is now a problem you have to deal with in two tax systems at once.

This catches Singapore freelancers constantly once they pick up clients in markets that operate withholding on professional fees. And the instinct most people have, which is to quietly write off the shortfall as a cost of doing business, is usually the wrong call. You may be paying tax twice on the same money.

Two routes exist, and the order matters enormously.

The good route is stopping the deduction before it happens. Singapore has a wide treaty network. IRAS's own list of DTAs, limited DTAs and exchange of information arrangements covers around 100 jurisdictions, so there's a decent chance your client's country is on it. Where a treaty applies, it can reduce or remove the withholding on your fee. But your client cannot just take your word that you're a Singapore tax resident. They need proof, and the proof is a Certificate of Residence.

A COR is a letter from IRAS confirming you're tax resident here, issued so you can claim treaty benefits from a foreign tax authority. Individuals can apply, and IRAS sets out how on its Apply for Certificate of Residence page. The thing to understand is the timing. A COR is worth far more before your client processes payment than after, because once the tax has been remitted to a foreign revenue authority, getting it back means a refund claim in a country whose tax system you don't know, in a language you may not read.

The salvage route is claiming a foreign tax credit. If tax has already been withheld, IRAS allows resident individuals to claim relief in some circumstances so the same income isn't taxed twice. Its guidance on claiming foreign tax credit sets three conditions that all have to be met: you're a Singapore tax resident for that basis year, tax has been paid or is payable on that income in the foreign country, and the income is taxable in Singapore.

Read the third one carefully, because it's where people come unstuck. A credit only helps against tax you actually owe here. And the amount of relief is not automatically the full sum withheld. Whether you qualify, and for how much, turns on the specific treaty and your own circumstances, so this is a question for IRAS or an adviser rather than a rule you can apply from a blog post.

What you can do without advice is stop losing the paperwork:

• Ask before you sign, not after. A single question to a new overseas client about whether they withhold tax on service fees will tell you what you're walking into.
• Get the withholding certificate every time. Whatever the client's country calls it, that document is your evidence the tax was paid. Without it you have a shortfall you cannot explain and cannot claim.
• Invoice the gross amount. Your books should show the full fee earned and the tax deducted as a separate line, not a smaller invoice. That way your records match what actually happened.
• Apply for the COR early if a client is going to be ongoing. One certificate can cover repeated payments through the year instead of you fighting the same battle each invoice.
• Don't assume small amounts don't matter. Ten percent withheld across a year of steady work with one foreign client adds up to a real number, and it's a number you may not have to lose.

And if a client tells you they must withhold and there's nothing to be done, that's worth testing rather than accepting. Plenty of finance teams apply a default rate because nobody has ever handed them a residence certificate.

Do you file a 2-line or 4-line statement?

This is the bit of the Form B that trips up first-time filers, and it comes down to one number: your annual revenue.

If your revenue is below S$200,000, you file a 2-line statement. You report just two figures, revenue and adjusted profit. That is genuinely all IRAS wants from you, and it is why most sole proprietors find the filing itself takes minutes once the bookkeeping is done.

Once revenue reaches S$200,000, you move to a 4-line statement: revenue, gross profit, allowable business expenses, and adjusted profit. Nothing about your tax rate changes, and you do not suddenly owe more. You are just showing your working in more detail.

Note that the threshold is on revenue, not profit. A consultant billing S$220,000 with S$60,000 of expenses is on a 4-line statement even though the profit is well under S$200,000. Plan your bookkeeping around the number you invoice, not the number you keep.

What can you deduct?

Allowable business expenses are costs incurred wholly and exclusively to earn your income. Common examples for freelancers include:

• Software subscriptions and tools you use for client work.
• A reasonable portion of your phone and internet bills used for business.
• Professional development directly related to your trade.
• Business travel, transport to client meetings, and courier costs.
• Marketing, a website, and payment processing fees.
• Home office expenses on a fair, apportioned basis if you work from home.

Keep every receipt and a simple record of what each expense was for. Private and personal costs are not deductible, and mixed expenses should be split fairly between business and personal use.

There is an exception worth knowing about if you drive, deliver, or work on commission. IRAS runs a Fixed Expense Deduction Ratio that lets qualifying workers claim a deemed percentage of gross income as expenses instead of adding up actual receipts. It started with private hire and taxi drivers in YA 2019, extended to qualifying commission agents in YA 2020 at 25 percent of gross commission, and reached delivery workers in YA 2024.

Two things to be clear about. As the rules stand it is not a general shortcut for every sole proprietor, so if you are a consultant or designer it does not currently apply to you. And it replaces your actual expense claim rather than sitting alongside it, so if your real costs run higher than the deemed ratio you are better off itemising. Check the rate for your own trade on the IRAS page before you decide, because the percentages differ by category.

That first point may be about to change, which is worth knowing before you set up your bookkeeping for the year. The Ministry of Finance ran a public consultation on the proposed Finance (Income Taxes) Bill 2026 from 8 June to 1 July 2026, covering 20 amendments to the Income Tax Act 1947. Among those from its periodic review of the income tax system is introducing a broad-based Fixed Expense Deduction Ratio for self-employed persons and individual sole proprietors.

Where it stands now: the consultation has closed and the Bill has not passed. MOF is blunt about the status of what it published, saying the draft was released only for the purpose of consultation and should not be used for individual or business decisions because it does not represent the final legislation. Take them at their word on that.

So read it as a signal rather than a rule you can use. The detailed ratio and the Year of Assessment it would start from sit in the annexes rather than the announcement, and nothing is in force until the Bill passes and commences. But the direction is clear enough to be useful: the deemed-expense route looks likely to widen beyond drivers, commission agents and delivery workers. If your actual expenses are low relative to your income, that could eventually save you a lot of receipt-filing. Keep itemising properly in the meantime, because you cannot claim a ratio that has not commenced, and a half-kept set of records is the worst position to be in if the rules change under you.

How long do you need to keep your records?

Five years. That is the part most freelancers find out about far too late, usually when someone asks a question about a year they have already mentally closed.

IRAS expects self-employed persons to keep proper records and accounts for five years, so that the income earned and the business expenses claimed can be readily determined. And the records on their own are not enough. You need to be able to back them up with invoices, receipts, vouchers and other supporting documents.

Read that requirement carefully, because it sets a higher bar than most people assume. A spreadsheet saying you spent S$480 on software in March is a record. The receipt proving it is the support. If a claim gets queried and you have the first without the second, you are in a weak position.

What this means in practice

• Every invoice you issue, kept for five years. Not just the amounts, the actual documents. This is the income side of your return and it is the first thing anyone would ask to see.
• Every receipt behind an expense you claimed. Card statements show that money left your account. They do not show what you bought or why it was a business cost.
• Bank records that let you reconcile the two. If your invoices say one number and your account says another, you want to be the one who noticed first.

The practical trap here is the small stuff. Nobody loses the S$8,000 project invoice. People lose the S$30 receipts, and across a year those add up to a deduction you can no longer support, which quietly costs you real money on your bill. Photograph them the day you get them.

Five years also means the clock is longer than your filing habit. Filing for 2025 in April 2026 does not close 2025. Keep a folder per year, and do not clear one out until it is genuinely past the window.

Do you have to pay CPF as a sole proprietor?

Self-employed people in Singapore have one compulsory CPF obligation: MediSave. If your net trade income for the year is more than S$6,000, you must contribute to your MediSave account. The amount is a percentage of your net trade income, and the percentage depends on your age and income, up to a yearly cap. IRAS and the CPF Board coordinate this, and you will usually receive a notice telling you how much to pay after you file. Paying MediSave is not optional, and it builds your own healthcare savings, so treat it as part of your annual tax routine.

Two details worth getting right. The CPF Board calculates your contribution using your age as at 1 January of that year, not your age when you pay, so a birthday mid-year does not change the bill. And from work year 2025 onwards, net earnings from platform work are excluded from the net trade income used in this calculation, because platform operators now handle those contributions separately. If you mix agency work with platform gigs, those two streams are treated differently.

The CPF Board defines net trade income for this purpose as your gross trade income minus allowable business expenses, capital allowances and trade losses, as determined by IRAS. In other words it is the same profit figure you already reported, not a second calculation.

Does paying MediSave reduce your tax bill?

Yes, and calling it compulsory hides that. MediSave isn't only a bill you settle after filing. It's also a tax relief, so what you put in comes off your assessable income. Plenty of sole proprietors pay it for years without ever noticing they were getting something back.

Per IRAS, your relief on compulsory MediSave and voluntary CPF contributions is whichever of three figures is lowest: 37 percent of your assessable income, the CPF Annual Limit of S$37,740, or the amount you actually contributed. For most sole proprietors the actual contribution is the smallest of the three, so in practice you get relief on what you paid.

The voluntary side is where this gets genuinely useful, and where the rules bite. You can top up your CPF beyond the compulsory MediSave amount and claim relief on that too. But if you also hold a job, your compulsory employee CPF counts toward the same annual limit. Once employee CPF plus compulsory MediSave already exceeds that limit, voluntary contributions earn you no further relief at all. So work out where you sit before topping up, because money added after you've hit the ceiling is just cash you can't touch until much later, with no tax benefit attached.

One ceiling sits above all of it. A personal income tax relief cap of S$80,000 applies to the total of every relief you claim in a Year of Assessment, CPF included. Most sole proprietors are nowhere near it. But if you're claiming across several relief categories, that's the number that decides whether one more actually does anything for you.

Is there a point where you stop paying MediSave?

Yes. MediSave has a ceiling called the Basic Healthcare Sum, and once your MediSave account reaches it you are no longer required to keep topping it up. Almost nobody mentions this to sole proprietors, so people assume the obligation runs forever. It does not.

For 2026 the CPF Board set the Basic Healthcare Sum at S$79,000 for members below 65, up from S$75,500 in 2025. It is raised most years while you are under 65, which is the part that trips people up: it is a moving target rather than a fixed finish line, and it rises to keep pace with healthcare costs.

Two age rules decide whether it keeps moving for you. If you turn 65 in 2026, your Basic Healthcare Sum is fixed at S$79,000 and stays there for the rest of your life. If you are already 66 or older, your cohort figure does not change either. So the annual increase only applies while you are under 65, and whatever the number is in the year you turn 65 is the one you keep.

Be realistic about when this affects you. S$79,000 is a lot of MediSave to accumulate on self-employed contributions alone, so if you are in your twenties or thirties this is a ceiling you will not touch for a long time. It matters most if you spent years as an employee before going freelance, since employee CPF builds MediSave much faster, and you may be closer to the cap than you would guess.

The practical move is to check your MediSave balance against the current Basic Healthcare Sum before you assume you owe the full compulsory amount. The CPF Board's self-employed MediSave calculator, linked earlier in this guide, works out what you actually owe for the year, and it accounts for where your balance already sits. Do not just pay the number a third-party article quotes at you.

What if you freelance alongside a full-time job?

You file one return covering both, and the freelance side does not get a free pass because your employer already deducted nothing and reported your salary for you. This is the most common shape a Singapore freelancer actually takes, and it is where the filing rules trip people up.

Go back to the two triggers near the top of this page. Total annual income above S$22,000 is the one people remember, and your salary alone often clears it. The second trigger is the one that catches side businesses: net profit from self-employment above S$6,000. Those are separate tests and you only need to meet one.

So the awkward case is the person earning a normal salary who makes S$8,000 of profit from weekend work and assumes it is too small to declare. It is not. The salary is already reported by the employer, the freelance profit is not, and the second trigger exists precisely to capture it.

Three practical consequences.

• Your freelance profit stacks on top of your salary. It is not taxed separately at some lower rate. It sits on the top slice of your total chargeable income, so it is taxed at your highest marginal band rather than starting again from zero. That is why the tax on a small side business can feel disproportionate.
• You still owe MediSave on the self-employed portion. Employment CPF from your day job does not cover it. MediSave is due on your net trade income once it passes the threshold, separately from whatever your employer contributes on your salary.
• Deductions only apply to the business side. You can deduct expenses incurred wholly in producing the freelance income. Nothing from your employment gets deducted here, and mixing the two is a fast way to an amended assessment.

The bookkeeping fix is boring and works. Keep the freelance income and expenses in their own account and their own spreadsheet from day one, so that at filing time the business figure is already sitting there rather than being reconstructed out of a personal bank statement in April.

Are you a platform worker, and does that change things?

Yes, quite a lot, if you drive or deliver through an app. Since 1 January 2025 platform workers sit in their own legal category that is neither ordinary self-employed nor employee, and the CPF paragraph above only tells half that story.

The change came from the Platform Workers Act 2024, which MOM brought fully into force on 1 January 2025. It covers people doing ride-hail, delivery and similar work through a platform operator. If you are a designer, tutor or consultant invoicing clients directly, none of this applies to you and the rest of the guide is your version.

What changed for CPF?

Increased CPF contributions became mandatory for platform workers born on or after 1 January 1995. Platform operators now contribute alongside you, stepping up in stages toward parity with employer rates by 2029, so you build Ordinary and Special Account savings rather than only MediSave. Check your own rate on the CPF Board site, because it depends on your birth year and the year you are in.

Workers born before 1995 can opt in instead. Two things about that decision deserve more attention than they usually get:

• It cannot be reversed. MOM is explicit that there is no deadline to opt in and that the choice is permanent once made. This is a one-way door, so it is worth doing the sums properly rather than tapping through a prompt in an app.
• It lowers your take-home now to raise your savings later. More CPF means less cash this month. Whether that trade suits you depends on your housing plans, your age and how thin your month already runs.

Uptake was quick. MOM reported more than 8,000 platform workers had opted in by December 2024, before the Act even commenced. And lower-income workers who opt in can get Platform Workers CPF Transition Support, which offsets part of the year-on-year rise in their own share of the contributions.

That support is tapering, and if you opted in during 2025 the number you remember is no longer the number you get. Per the CPF Board, PCTS offsets the increase in your Ordinary and Special or Retirement Account contributions at 100 percent in 2025, 75 percent in 2026, 50 percent in 2027 and 25 percent in 2028. So this year you are absorbing a quarter of the step-up yourself, and that share grows each year until the support ends.

The eligibility test runs monthly rather than annually, which catches people out. You qualify if you are a Singapore citizen, you were born in 1995 or later or opted in, your share of those contributions has gone up on last year, and your net income from platform work and other employment does not exceed S$3,000 for the month. A good month can put you over the line and cost you that month's support. There is nothing to apply for. CPF assesses you automatically from the net earnings your platform operator declares, so the thing to check is that those declarations are right.

What else did the Act bring?

Work injury coverage, which is the part that gets least attention and may matter most. Platform operators must now provide work injury compensation insurance at the same level of coverage as employees get. Before this, a rider hurt on a job was often on their own.

On the tax side, this is why the CPF section above notes that platform earnings are excluded from the net trade income used for your MediSave calculation from work year 2025. The operator handles those contributions, so counting the same earnings twice would overcharge you.

The practical consequence if you mix income types: platform work and ordinary freelancing are two streams treated differently for CPF, and lumping them into one figure will give you the wrong number. Keep them separated in your records from the start of the year rather than trying to unpick them in April.

One thing that did not change. Platform income is still taxable trade income and you still declare it. The Act reshaped CPF and insurance, not whether the money counts.

What are the key deadlines?

The Singapore tax year, called the Year of Assessment, covers income earned in the previous calendar year. The main filing deadline is 18 April for online filing, with an earlier date of 15 April for paper filing. Mark these in your calendar well ahead of time. Filing late can lead to penalties, and rushing at the last minute is how mistakes happen. After you file, IRAS issues a Notice of Assessment showing your tax payable, which you can pay in one go or by GIRO instalments.

One budgeting habit worth building. Personal income tax rebates are announced Budget by Budget, and they are not a standing feature of the system. Singapore has granted them in some Years of Assessment and not in others, at different percentages and caps each time. So do not assume last year's rebate applies to this year when you are setting money aside. Check the IRAS rebate page for the specific Year of Assessment you are filing before you count on it, and if you are not sure, budget as though there is none. Being pleasantly surprised in April beats the alternative.

Here's a live example of why that matters, because the confusion is already out there. A Personal Income Tax Rebate of 60 percent of tax payable, capped at S$200, was granted to tax residents for Year of Assessment 2025. Several third-party tax guides now repeat that same 60 percent and S$200 figure as though it applies to YA 2026. It's the kind of copy-paste error that spreads fast, because the numbers are real and only the year is wrong.

For Year of Assessment 2026 the answer is now settled, and it is worth knowing before you set money aside: Budget 2026 granted no personal income tax rebate. The 60 percent rebate capped at S$200 covered YA 2024 and YA 2025 and was not extended, so an individual with identical income pays slightly more tax in YA 2026 than in YA 2025. Budget it that way. And keep the general habit anyway, because rebates come out of the Budget, IRAS applies them automatically once granted, and you never need to claim one. There is no downside to budgeting without a rebate and being wrong. There is a real downside to budgeting with one that belongs to a different year.

What if you made a mistake or missed a year?

Tell IRAS before they ask you. That single move is worth real money, and it's the part of the system almost nobody knows about until they need it.

IRAS runs a Voluntary Disclosure Programme that reduces or waives penalties when you come forward yourself. For income tax, a voluntary disclosure made within a grace period of one year from the statutory filing date gets the penalty waived. Disclose after that window and the penalty drops to 5 percent for each back year involved, applied on an incremental basis, rather than the much steeper penalties that apply when IRAS finds the problem first.

The qualifying conditions are the part to read carefully. A disclosure has to be accurate, complete, timely and self-initiated, and that last word is doing the heavy lifting. It only counts if you come forward before IRAS starts an audit or investigation, or before they send you a query about that specific matter. Once a letter arrives asking about something, the option is gone for that issue.

Read together, those two rules point at one behaviour. If you realise in September that you understated last year's income, disclosing now is materially cheaper than discovering the same thing after a query lands. Waiting does not make it quieter. It just moves you out of the grace period and eventually out of the programme.

The situations where this matters most for sole proprietors are ordinary rather than dramatic:

• A client's payments went to a second bank account you forgot to include.
• You claimed something as a business expense that was really personal, or claimed the full cost of something you should have apportioned.
• You had a side income year you assumed was too small to file for, before reading the S$6,000 net profit trigger further up this page.
• Overseas client income you treated as foreign-sourced when the work was done here.

None of those make you a tax evader. They make you someone who needs to file an amendment, which for individual income tax you can generally do yourself through myTax Portal. Fix it, keep the record of when and why you fixed it, and move on.

Does the No-Filing Service mean you don't have to file?

Usually not, if you're self-employed. This is the single most expensive misunderstanding in Singapore personal tax, because the letter that tells you you're covered looks a lot like the letter that tells you you're not.

Here's how the system works now. In a media release dated 10 March 2026, IRAS said over 2 million individual taxpayers were expected to benefit from the No-Filing Service for YA 2026, with about 1 million of those receiving their tax bill directly under the Direct Notice of Assessment initiative from mid-March. If you're in either group, IRAS has already computed your tax and you don't file a return.

But that works because employers and intermediaries send your income straight to IRAS. Sole proprietors often have no such intermediary. IRAS spells out who still has to file, and the examples it gives are exactly the people reading this: self-employed individuals whose income isn't pre-filled, naming home-based business owners, private tuition teachers, and people providing media or creative services. If you invoice clients directly, nobody is reporting that income for you.

So watch for the SMS, email or letter IRAS sends between February and March telling you which category you're in. Don't assume. And even if you are on NFS or D-NOA, you're still responsible for the numbers being right. IRAS is explicit that taxpayers must verify their income details and make sure everything is declared, including self-employment and rental income. If something's missing, you amend the tax bill within 30 days of its date, or file a return by 18 April.

What happens if you pay late?

It gets expensive faster than most people expect, and the figures aren't hypothetical.

Tax is due within one month of the date on your tax bill, not on 18 April. Miss that and a 5 per cent late payment penalty lands on the unpaid amount, unless you're on an approved instalment plan. From there IRAS can appoint agents to recover the money directly, and its own list of agents includes your bank, your employer, your tenant, or the lawyer handling a property sale. It can also issue a Travel Restriction Order or take legal action.

How often does this actually happen? For YA 2025, IRAS collected over $5 million in penalties from close to 37,000 taxpayers who didn't pay on time. That's an average of roughly $135 each, so these are mostly ordinary people missing an ordinary deadline rather than a handful of large cases.

The fix costs nothing. Set up GIRO, which starts collecting in May each year and gives you up to 12 months of interest-free instalments. For a sole proprietor with lumpy income, spreading the bill across the year is easier than finding it in one month anyway. And if you genuinely can't pay, contact IRAS before the due date rather than after, since a longer instalment plan can be arranged for extenuating circumstances.

When do you need to register for GST?

Once your taxable turnover passes S$1 million. Below that you are not required to register, and most sole proprietors never get there.

IRAS applies two tests, and you only need to fail one. The retrospective test looks back: if your taxable turnover over the past 12 months exceeded S$1 million, you must register. The prospective test looks forward: if you can reasonably expect to cross S$1 million in the next 12 months, you must register then, not after the fact. That second one catches people who sign a large contract and assume they can wait and see. The current GST rate is 9 percent, unchanged since 1 January 2024.

Here is the detail that genuinely surprises sole proprietors, and it is worth knowing before you start a second venture. A sole proprietorship registers for GST under the owner's name, and all your sole proprietorship businesses are combined for the threshold. Two businesses turning over S$600,000 each are not two businesses safely under the line. They are S$1.2 million and you are registrable. The S$1 million belongs to you, not to each trading name.

You can also register voluntarily while under the threshold. That is worth considering only if you buy a lot from GST-registered suppliers and want to claim the input tax back, and mainly if your clients are businesses who can reclaim the GST you charge them. If you sell to consumers, voluntary registration just makes you 9 percent more expensive. It also locks you into filing returns and staying registered for at least two years, so it is not a decision to take lightly.

Once you are registered, your invoices have to change. Our GST invoice guide covers the mandatory fields IRAS requires and the difference between a simplified and a full tax invoice.

Is it better to stay a sole proprietor or incorporate?

This is the question that shows up once the profit gets meaningful, and the honest answer is that tax is only one input. But it is the input people ask about, so here is how the two actually differ.

As a sole proprietor your profit is taxed at your personal rates, which run from zero on the first S$20,000 of chargeable income up to a top marginal rate of 24 percent. There is no business-level exemption. A private limited company is taxed separately at a flat corporate rate of 17 percent, and a qualifying new company gets the Start-Up Tax Exemption on top of that. There is also a timing quirk worth knowing this year. Budget 2026 gave companies a 40 percent corporate income tax rebate for YA 2026, with the total benefit capped at S$30,000, while individuals got no rebate at all. That gap is a one-off rather than a structural feature, so it is a reason to check the current year rather than a reason on its own to incorporate.

The exemption is the part worth understanding, because it is where the gap opens up. Under SUTE a qualifying company gets 75 percent exemption on its first S$100,000 of normal chargeable income and 50 percent on the next S$100,000, for its first three consecutive Years of Assessment. That is up to S$125,000 of exempt income a year. It applies automatically when you file, with no separate application.

Not every company qualifies. The company must be incorporated in Singapore, have no more than 20 shareholders throughout the basis period, and have at least one individual shareholder holding at least 10 percent of the ordinary shares. Companies whose main activity is investment holding or property development are excluded.

Now the parts that are not tax, because they decide this more often than the rates do:

• Liability. A sole proprietorship is not a separate legal entity. Your business debts are your debts, and your personal assets are exposed. A company limits that to what you put in.
• Running cost. A company means annual returns, statutory accounts, a company secretary and usually an accountant. That is real money and real admin every year, whether you made a profit or not.
• How clients see you. Some larger clients and government buyers simply prefer contracting with a company. If that is your market, it can matter more than the tax.

So do not incorporate purely because you read that 17 is smaller than 24. Those two numbers are not comparing the same thing, since the personal rate is marginal and only bites on your top slice, while reliefs, your other income and the annual cost of running a company all move the answer. If you are near the point where it might pay off, that is the moment to spend an hour with an accountant rather than a blog post. This one included.

How do you stay organised through the year?

The freelancers who find tax season painless are simply the ones who stayed organised all year. Send clear, numbered invoices, save a copy of each one, and log your expenses monthly rather than scrambling in April. A short monthly habit of reconciling what came in against your invoices, and filing receipts as you go, turns tax filing into a quick review rather than a stressful reconstruction. Good invoicing is the foundation of good record keeping.

For the numbers behind your tax obligations, try the free Singapore and Malaysia tax calculators at AsiaCalc.

Sources: Inland Revenue Authority of Singapore (IRAS), Calculating business income, Basic guide for self-employed persons, and Keeping proper records and accounts, iras.gov.sg. Inland Revenue Authority of Singapore (IRAS), Do I need to register for GST, iras.gov.sg. Central Provident Fund Board, Self-Employed MediSave Contribution Calculator, cpf.gov.sg. Accounting and Corporate Regulatory Authority (ACRA), registering a sole proprietorship, acra.gov.sg. Inland Revenue Authority of Singapore (IRAS), Income received from overseas, iras.gov.sg. Inland Revenue Authority of Singapore (IRAS), Errors in tax returns and the Voluntary Disclosure Programme, iras.gov.sg. Central Provident Fund Board, Platform Workers CPF Transition Support, cpf.gov.sg, on the 100, 75, 50 and 25 percent offsets for 2025 to 2028, the S$3,000 monthly net income cap and automatic assessment. Ministry of Manpower, Commencement of Platform Workers Act from 1 January 2025, press release dated 17 December 2024, mom.gov.sg, on mandatory increased CPF for platform workers born on or after 1 January 1995, the irreversible opt-in for older workers, over 8,000 opt-ins by December 2024, work injury compensation coverage, and Platform Workers CPF Transition Support. Ministry of Finance, Public Consultation on Proposed Finance (Income Taxes) Bill 2026, consultation open 8 June to 1 July 2026 covering 20 amendments to the Income Tax Act 1947, mof.gov.sg, including a proposed broad-based Fixed Expense Deduction Ratio for self-employed persons and individual sole proprietors. MOF states the draft was released only for the purpose of consultation and does not represent the final legislation. Consultation closed and the Bill had not passed as at August 2026, so the ratio is not in force. Inland Revenue Authority of Singapore (IRAS), Central Provident Fund (CPF) relief for self-employed persons, iras.gov.sg, on relief being the lowest of 37 percent of assessable income, the CPF Annual Limit of S$37,740, or the actual contribution, and on the S$80,000 personal income tax relief cap that applies to all reliefs combined per Year of Assessment. Inland Revenue Authority of Singapore (IRAS), Personal Income Tax Rebate, iras.gov.sg, on the rebate of 60 percent of tax payable capped at S$200 granted to tax residents for Year of Assessment 2025, and on rebates being granted automatically without any need to claim. No equivalent rebate for YA 2026 was confirmed on that page as at August 2026, and third-party guides restating the YA 2025 figure as a YA 2026 one are misreporting the year. Thresholds and deadlines are current as at August 2026 and are set by the authorities, so check the official pages before you file. CPF Board, CPF interest rates from 1 January to 31 March 2026 and Basic Healthcare Sum for 2026, cpf.gov.sg, on the Basic Healthcare Sum rising to S$79,000 for members below 65 from S$75,500, being fixed at S$79,000 for life for members turning 65 in 2026, and remaining unchanged for members aged 66 and above. This guide is general information, not tax advice.