If your Singapore company pays a non-resident — for interest, royalties, technical or management services, director’s fees, or rent on movable property — you may have to withhold tax from that payment and remit it to the Inland Revenue Authority of Singapore (IRAS) under Section 45 of the Income Tax Act 1947.
The mechanic is simple in theory: deduct, file, and pay on time. In practice, missing a withholding obligation triggers a 5% surcharge plus 1% per month, and the cost falls on the payer (you), not the non-resident. This 2026 guide explains which payments are caught, the headline rates, how Double Tax Agreement (DTA) relief works, and how to file and pay through IRAS’ myTax Portal.
What Is Singapore Withholding Tax?
Withholding tax is a final tax on certain Singapore-sourced payments to non-resident persons. The payer is required to withhold the tax at the time the payment is made (or deemed made) and remit it to IRAS. The non-resident is the taxpayer; the payer is the agent collecting on IRAS’ behalf — but it is the payer that faces penalties for non-compliance.
Which Payments Are Caught?
Section 45 catches the following classes of payments to non-residents:
- Interest, commissions, fees or any other payment in connection with any loan or indebtedness
- Royalties or other lump sums for the use of movable property, copyright, patents, trademarks, or know-how
- Payments for the use of, or right to use, scientific, technical, industrial or commercial knowledge or information
- Management fees
- Rent or other payments for the use of movable property
- Directors’ fees paid to non-resident directors
- Distributions from a real estate investment trust (REIT) to non-resident unit-holders
- Payments to non-resident professionals (e.g. consultants) for services rendered in Singapore
- Payments to non-resident public entertainers for performances in Singapore
Headline Withholding Tax Rates
Interest, royalties and technical services
- Interest: 15% on gross (final tax) — domestic rate
- Royalties: 10% on gross (final tax)
- Technical / management service fees (services in Singapore): Prevailing corporate tax rate (17%) on net income basis
- Rent on movable property: 15% on gross
Non-resident directors
Directors’ fees paid to non-resident directors are subject to withholding at 24% (prevailing top marginal rate). This applies regardless of whether the director attended board meetings in Singapore.
Non-resident professionals and public entertainers
- Non-resident professionals: 15% on gross OR 24% on net (taxpayer can elect)
- Non-resident public entertainers: 10% on gross (current concessionary rate)
Treaty Relief: Using Singapore’s DTAs
Singapore has more than 90 comprehensive Double Tax Agreements. Where a DTA exists, the treaty rate often reduces or eliminates the domestic withholding rate. For example:
- Interest paid to a Hong Kong resident — DTA caps the rate at 0% (vs 15% domestic)
- Royalties paid to a UK resident — DTA caps the rate at 8% (vs 10% domestic)
- Technical services where there is no permanent establishment — may be exempt under the business profits article
To claim treaty relief, the payer must obtain a Certificate of Residence (COR) issued by the non-resident’s tax authority for the relevant year. The COR must cover the year in which the payment is made. Without a valid COR, IRAS will deny treaty relief on audit and recover the shortfall plus penalties.
Filing and Payment Deadlines (S45 Filing)
Withholding tax must be paid to IRAS by the 15th of the second month following the date of payment (or deemed payment).
Example: A payment made on 10 March 2026 must be remitted to IRAS by 15 May 2026. Filing is via the S45 form on myTax Portal. Payments are accepted via GIRO, eNETS or PayNow.
Penalties for Non-Compliance
- Late payment: 5% surcharge on tax outstanding
- Continued default: Additional 1% per month, up to a maximum of 15%
- Failure to file: IRAS can issue an estimated assessment and recover from the payer’s other assets
Common Pitfalls
Forgetting that the gross-up clause shifts the cost to you
Many service agreements with non-residents include a “gross-up” clause that requires the payer to bear the withholding tax. Read your contracts carefully — the headline price may not be the all-in cost.
Treating treaty relief as automatic
The COR must be on file at the time of payment, not retroactively. If you discover after the fact that no COR exists, withhold at the domestic rate.
Missing the Singapore-source rule
Withholding only applies where the income has a Singapore source. A consultant who never sets foot in Singapore and provides services entirely from abroad may not be caught — but document the position carefully.
Practical Compliance Workflow
- Before signing the contract, identify the type of payment and check the domestic withholding rate.
- Ask the non-resident for a COR if they want treaty relief. No COR = withhold at full rate.
- At payment time, deduct the withholding amount and remit only the net to the non-resident.
- File the S45 return and pay IRAS by the 15th of the second month after payment.
- Keep the COR, contract and invoice on file for at least 5 years.
How This Connects to Your Tax Filing
Withholding tax compliance is separate from your annual corporate tax return — but errors often surface during the corporate tax filing process. See our Form C-S vs Form C guide and the IRAS Voluntary Disclosure Programme guide if you have historic withholding tax errors to correct.
Final Thoughts
Singapore’s withholding tax regime is rules-based and unforgiving on timing. Build the S45 deadline into your payment workflow, demand CORs before remitting funds, and reserve the gross-up cost in your contracts. The downside of getting it wrong is a 5% surcharge — and IRAS comes after the payer, not the non-resident.
Raffles Corporate Services handles S45 filings, COR coordination and DTA position memos for clients across professional services, IP licensing and cross-border financing.
— The Editorial Team, Raffles Corporate Services