Withholding tax: check before you pay a non-resident
Interest, royalties and services performed in Singapore — when s45 makes you the tax collector, the rates, and why the contract stage is where this is won.
When do I need to withhold tax on payments to non-residents?
Under s45 of the Income Tax Act, certain payments to non-residents require you to withhold tax: interest at 15%, royalties at 10%, rent on movable property at 15%, and fees for services performed in Singapore at 17%. Filing and payment fall due by the 15th of the second month following the date of payment — which is the earliest of several events, including when the sum becomes due under the contract, not simply when the transfer is made.
Withholding tax inverts the usual arrangement: when you make certain payments to a non-resident, s45 of the Income Tax Act makes you responsible for deducting tax and handing it to IRAS. Miss it, and the liability — with penalties — is yours, not the vendor's.
Payments in scope, and the rates
Per IRAS, the common ones for a small company:
| Payment to a non-resident | Rate |
|---|---|
| Interest on loans | 15% |
| Royalties — use of IP, know-how, commercial information | 10% |
| Rent on movable property (equipment) | 15% |
| Fees for services performed in Singapore | 17% |
| Non-resident director's remuneration | 24% |
Two boundaries do most of the work in practice. Services: withholding applies to services performed in Singapore — a consultant who works entirely from overseas is generally outside it, but fly the same consultant in for two weeks and the fee for that work is in scope. Royalties vs purchases: paying to use intellectual property is a royalty; buying a product that happens to contain IP usually is not. Software and SaaS sit right on this line — end-user licences are generally not royalties, commercial exploitation rights can be.
Deadlines and mechanics
File and pay by the 15th of the second month following the date of payment to the non-resident.
That phrase is a term of art, and taking it to mean "when the money left the bank" is a common way to file late. For withholding tax the date of payment is the earliest of several events — broadly, when the amount is credited to the non-resident's account, when it is otherwise made available to them, when it becomes due and payable under the contract, or when it is actually paid. A fee contractually due in March but settled in June is generally counted from March, not June, so the deadline can fall before you have parted with the cash.
Double tax treaties frequently reduce the rates — sometimes to zero on interest or royalties. To rely on one, get a certificate of residence from your counterparty and keep it with your records.
Win it at the contract stage
The recurring, expensive mistake: signing a contract silent on withholding, paying the invoice gross, and discovering the obligation later. At that point you either recover the tax from an unwilling vendor or bear it yourself — grossed up, because the tax is computed on the amount the non-resident was entitled to receive.
The fix costs nothing: before signing any cross-border contract for loans, IP, equipment or services, ask "does s45 apply, and who bears the tax?" — and write the answer into the payment clause. A gross-up clause, a treaty rate, or simply pricing the tax in: any of these is fine, as long as it is decided before the money moves.
Make "check before you pay a non-Singapore tax resident" a standing rule in your payment process — one question per foreign invoice, against the table above. It sits naturally in the payment workflow you delegate, but the judgement on ambiguous cases is worth an adviser's confirmation the first few times.
Frequently asked questions
This guide is general information, not legal or tax advice. Confirm requirements with ACRA and IRAS, or speak to your corporate secretary.