Withholding Tax on Payments to Non-Residents

A Singapore distributor brings in a US consultancy to run a three-day sales workshop at its office. The invoice — S$20,000, dated 27 February — goes to the director who signed the engagement, sits in an inbox, and reaches the finance team in April. Accounts payable checks it, gets approval, and pays the full S$20,000 on 22 April. Everyone did their job.

In November, while preparing the tax computation, the accountant asks a question nobody had considered: where is the withholding tax? Training delivered in Singapore by a non-resident company is a service fee. The US has no comprehensive tax treaty with Singapore. So 17% of the fee — S$3,400 — should have been held back and paid to IRAS. It was due on 15 April, a week before the supplier was even paid. The consultancy has the full S$20,000. The S$3,400 now comes out of the distributor's pocket, with penalties on top.

This is withholding tax, sometimes called Section 45 tax after the section of the Income Tax Act that creates it. Most Singapore SMEs never think about it because most of their suppliers are local. It catches them the first time they pay a foreign trainer, borrow from an overseas shareholder, or license a brand. The rules are not complicated. They just live outside the normal accounts payable process, which is why they get missed.

How withholding tax works

When you make certain types of payment to a non-resident, you — the payer — must withhold a percentage of the payment and pay it to IRAS. The supplier receives the rest. IRAS collects tax from a party it cannot easily reach (the foreign supplier) through a party it can (you).

Three points shape everything that follows:

The obligation is yours. The supplier may never have heard of Singapore withholding tax. That does not move the responsibility.
It is income tax, not GST. Whether GST applies to an imported service is a separate question with separate rules. Getting one right says nothing about the other.
It is calculated on the gross payment. Not on the supplier's profit, and not on the amount after bank charges.

Who counts as a non-resident

Residence is not the same as where the supplier is incorporated or where its bank account sits.

A company is non-resident if its control and management is exercised outside Singapore — usually, where its board makes strategic decisions. A Singapore-incorporated company controlled from abroad can be non-resident. A foreign-incorporated company managed from Singapore can be resident.
An individual is non-resident if they are in Singapore for less than 183 days in a calendar year. That includes non-resident directors and independent professionals such as consultants, trainers, coaches and seminar speakers working here under a contract for service.

For a foreign supplier with no Singapore office, assume non-resident unless you have evidence otherwise. Payments to a supplier's Singapore branch follow different rules: IRAS waives withholding on Section 12(6) and 12(7) payments made to Singapore branches of non-resident companies. Check who the invoice is actually from.

Which payments it covers, and at what rate

These are the IRAS rates that matter for most SMEs. They apply to the gross payment unless a tax treaty reduces them.

Payment to a non-resident	Rate	Typical SME example
Interest, and fees connected with a loan	15%	Loans from overseas lenders, shareholders or related companies
Royalties, and payments for technical or commercial know-how	10%	Brand licences, franchise fees, rights to use IP
Rent for movable property	15%	Leasing equipment from an overseas owner
Technical, service and management fees	17%	Only on the part of the work done in Singapore
Director's fees	24%	Fees to directors who are not Singapore tax residents
Independent professionals	15% of gross, or 24% of net	Consultants, trainers, coaches working here as individuals
Public entertainers	15%	Performers and artistes appearing in Singapore

Two things this table hides:

The 17% on services is not necessarily the final tax. It is the prevailing corporate tax rate. A non-resident company can submit accounts and a tax computation to claim its expenses, and IRAS refunds any excess. That is the supplier's choice to make. You still withhold 17%.
The 15% and 10% rates are final tax when the non-resident carries on its operations outside Singapore. If the income comes from operations in Singapore, the corporate rate (or 24% for individuals) applies instead.

Dividends are not on the list. Singapore does not withhold tax on dividends, even where a treaty mentions a dividend rate.

Services: where the work is done decides it

Service fees cause the most confusion because the same supplier can trigger withholding on one engagement and not the next. IRAS draws the line at where the work is performed:

On-site work in Singapore is in scope. Installation, technical support, training, consultancy, and management services delivered here attract withholding on the fees attributable to the Singapore work.
Remote work is out of scope. If the supplier delivers by email, video call, or online presentation without sending anyone to Singapore, the service is rendered outside Singapore and no withholding applies.
Mixed engagements split. A project with two weeks of remote design and three days of on-site implementation attracts withholding on the on-site portion. That only works if the contract or invoice shows the split. Ask for it.
Allowances count as fees. If you pay daily or monthly allowances to the supplier's staff while they work here, IRAS treats those as additional service fees.
Hardware is not a service. On a software customisation contract that bundles hardware, the hardware portion is not subject to withholding. The customisation work is, if it is done in Singapore.

The practical consequence: whether a service invoice needs withholding depends on a fact that rarely appears on the invoice. Someone has to know whether the supplier's people were physically here.

Software: the question is what rights you bought

Paying an overseas vendor for software does not automatically mean withholding. IRAS asks whether you can commercially exploit the software — reproduce it, modify or adapt it and distribute it, or build derivative works for distribution.

Buying software for use in your own business, with no right to reproduce or distribute it, is not subject to withholding. This covers the ordinary case of an SME licensing tools for its staff.
Licensing rights to commercially exploit someone else's copyright is a royalty, subject to 10% or a lower treaty rate. A business that white-labels and resells an overseas platform, or embeds licensed code in a product it sells, is in this territory.
Buying the copyright outright — complete transfer of ownership — is a sale, not a royalty, and is not subject to withholding.

If your contract with a foreign software vendor contains the words "reproduce", "sublicense", or "distribute", it is worth a closer read.

Tax treaties reduce the rate, they don't remove the filing

Singapore has Avoidance of Double Taxation Agreements (DTAs) with many countries. A DTA can reduce the withholding rate or remove it entirely. For services, many treaties only allow Singapore to tax a foreign company's business profits if it has a permanent establishment here. A consultancy from a treaty country with no Singapore office often owes nothing.

To claim treaty relief, you need:

Confirmation the treaty applies. IRAS provides an S45 Double Taxation Relief calculator in myTax Portal for non-resident companies, and a separate DTA calculator for non-resident professionals. The full treaty list is on the IRAS site.
An original Certificate of Residence from the supplier, issued by its home tax authority, for each year you claim relief. Last year's certificate does not cover this year.
A filing anyway. Even when the treaty reduces the tax to zero, you must still file the withholding tax form and tick the treaty relief box. Skipping the filing because "nothing is due" is itself a failure to file.

Declaring the wrong relief can attract late payment penalties, so the certificate needs to be on file before you file the form, not chased afterwards.

Not every country has a comprehensive treaty with Singapore. IRAS itself uses the US and Hong Kong as examples. Service fees for work done in Singapore by companies from those jurisdictions are withheld at 17%.

Who bears the tax: gross and net contracts

Foreign suppliers often quote a price and expect to receive it in full. If your contract says the supplier receives its fee net of Singapore tax, you are bearing the withholding tax. IRAS then calculates the tax on a grossed-up amount, not on the invoice:

Agreed fee, net of tax              S$10,000.00
Grossed-up fee  (10,000 ÷ 0.83)     S$12,048.19
Withholding tax (17% of gross)       S$2,048.19
Paid to supplier                    S$10,000.00
Total cost to you                   S$12,048.19

The effective tax is 20.5% of the agreed fee, not 17%. That difference belongs in the budget before the contract is signed. It is also the honest answer to "can we just pay them in full?": yes, and the extra cost is yours.

When there is no net-of-tax clause, the default is simple. Withhold the tax from the payment, pay the supplier the balance, and give them the IRAS acknowledgement so they can claim credit at home. Tell them before the payment lands short, not after.

The date that starts the clock

The filing and payment deadline is the 15th of the second month after the date of payment. The trap is the definition of "date of payment". For everything except director's fees, it is the earliest of:

When the payment is due and payable under the contract — or, if there is no contract, the date of the invoice, ignoring any credit terms
When the amount is credited to the supplier's account, or an account they designate
When you actually pay

That is why the workshop invoice in the opening was late before it was paid. No contract set a payment date, so the invoice date — 27 February — started the clock. Fifteenth of the second month: 15 April. The 30-day terms printed on the invoice changed nothing.

The same logic catches other arrangements:

Royalties that accrue quarterly are "paid" when they accrue at quarter end, even if the transfer happens weeks later.
Loan interest is "paid" when it falls due under the loan agreement, even if the overseas shareholder agrees to let it roll up unpaid.
Director's fees voted in arrears are "paid" when the shareholders approve them at the AGM — not when the money leaves the bank.

The safe operating rule: the withholding deadline is calculated from the invoice or accrual date, and it goes into the calendar when the invoice is received, not when it is approved for payment.

Filing, paying, and what lateness costs

Withholding tax is filed online through myTax Portal under the S45 service. The form is the IR37. Paper filing has not been accepted since July 2016. Individual payers filing for the first time activate their S45 account through a FormSG application first.

Some practical details:

Report in Singapore dollars. A foreign-currency invoice is converted before filing — IRAS's own amendment guidance uses "reported in foreign currency instead of Singapore dollars" as its example of an error to fix. Use the same rate policy as the rest of your books; the foreign-currency invoicing guide covers what IRAS accepts.
GIRO deducts on the 25th of the month the tax is due, or the next working day.
Mistakes can be amended online through myTax Portal for records filed within the last two years. Older corrections go through IRAS directly.

Penalties for paying late are mechanical:

5% of the unpaid tax as soon as the due date passes.
A further 1% per completed month once the tax is more than 30 days overdue.
Capped at 15% of the unpaid tax in total.

On the opening example, S$3,400 due on 15 April and discovered at year end attracts S$170 immediately and roughly another S$200 by November. Unpleasant, not ruinous. The real cost is the S$3,400 itself. Once the supplier has the full fee, recovering the tax is a negotiation with a business in another country, and the contract is the only leverage you have.

Where automation helps

Withholding tax is rarely missed because the rule is hard. It is missed because the information needed to apply it — supplier residence, where the work happened, what rights were licensed, whether a treaty certificate exists — sits in different places, and nothing in a normal payables process brings it together. That is a workflow problem:

Flag it in the supplier master. When an overseas supplier is set up, capture tax residence, whether a treaty may apply, and the expiry year of their Certificate of Residence. The supplier onboarding guide covers the core fields. Withholding status is one more, and it only has to be decided once.
Route non-resident invoices for a withholding decision. Invoice data extraction can identify a foreign supplier and a service-type line, then ask one question before approval: was any of this work done in Singapore?
Start the deadline at the invoice date. The moment a non-resident invoice is logged, calculate the 15th-of-the-second-month deadline from the invoice date and put it in the AP calendar. Holding an invoice in someone's inbox should never move a tax deadline.
Make the payment run withhold. The AP payment run should pay the supplier the net amount and post the withheld tax to a "Withholding tax payable" liability account in your chart of accounts. An open balance on that account at month end is an unfiled IR37.
Check it at close. One line on the month-end close checklist: every non-resident payment this month has either a filed IR37 or a recorded reason why none is needed.

None of this replaces judgement. Whether a contract creates a royalty, or whether a supplier has a permanent establishment here, are questions for your tax adviser. Automation makes sure the question is asked every time, at the right moment, and that the answer is recorded where your accountant will find it at corporate tax filing time.

The bottom line

The rules that matter most for a Singapore SME paying overseas:

Who pays IRAS          → you, the payer, not the supplier
Interest / loan fees   → 15%
Royalties / know-how   → 10%
Services               → 17%, only on work done in Singapore
Remote-only services   → no withholding
Own-use software       → no withholding
Treaty relief          → Certificate of Residence each year; still file
Net-of-tax contracts   → tax on the grossed-up fee (17% becomes ~20.5%)
Deadline               → 15th of the 2nd month from the EARLIEST of due date
                         (or invoice date), crediting, or payment
Late payment           → 5%, then 1% a month after 30 days, capped at 15%

Most SMEs make a handful of these payments a year, which is exactly the problem. A process used three times a year is never remembered. It has to be built into supplier setup and the payment run, so the question asks itself.

Use the Calcudesk automation ROI calculator to estimate what manual payables checks cost you. If your overseas payments go through the same process as local ones and nobody asks about withholding until year end, send us an enquiry and we will map where the decision should sit.