Understanding Withholding Tax in Singapore

If your business makes payments to foreign companies or individuals, such as a consultant overseas, a software development firm in India, or a board director based in London, you may need to deduct withholding tax (WHT) before the money leaves Singapore.

But not every overseas payment triggers WHT. The question is whether the payment has a Singapore source. For service payments, that depends on where the work is actually performed. For payment types like interest, royalties, and director fees, source is assumed and WHT always applies.

Withholding tax catches Singapore SME owners off guard for one consistent reason: it's easy to assume international payments are someone else's issue. They're not. As the payer, the obligation falls squarely on your business.

What Is Withholding Tax?

Withholding tax in Singapore is a tax deducted at the source of payment when a Singapore company or individual makes certain payments to a non-resident. Rather than the foreign recipient filing a Singapore tax return themselves, you (the payer) deduct the tax and pay it directly to IRAS via the S45 form.

The tax ensures Singapore can collect revenue from income with a Singapore source, even when the recipient is based overseas.

Who Is Considered a Non-Resident?

Withholding tax applies to payments made to non-residents. There are two categories:

Non-resident companies: Companies incorporated outside Singapore, or Singapore-incorporated companies managed and controlled from outside Singapore.

Non-resident individuals: Foreign professionals, public entertainers, and foreign board directors who spend fewer than 183 days in Singapore in a calendar year.

If you're paying a Singapore-resident company or individual, WHT generally does not apply; those recipients handle their own Singapore tax filing.

Does Location Matter? The Source Rule Explained

Under Section 45 of the Income Tax Act, WHT applies when a Singapore business makes a specified payment to a non-resident that has a Singapore source. What counts as a Singapore source depends on the type of payment. Getting it wrong costs money in both directions: over-withholding where it isn't required, or missing it where it is.

The consultant and service firm rule: If your foreign vendor provides services entirely from overseas without sending anyone to Singapore, WHT generally does not apply. The test is physical presence and where the work is actually performed. A software developer in Vietnam writing code remotely is outside scope. The same developer flying to Singapore to work on-site for a month brings the payment into scope.

The director exception: Non-resident directors are the clearest case. WHT at 24% applies to their director's fees regardless of where they physically are. Whether your London-based director attends board meetings by Zoom or in person makes no difference.

For digital subscriptions and SaaS paid to overseas providers, WHT is generally not in scope. Your obligation there is GST, not WHT. We cover this in our guide on charging GST to foreign clients.

Which Payments Attract Withholding Tax?

Once you've confirmed the payment falls within scope, the rate depends on the type of payment.

Source: IRAS, Types of Payment and Withholding Tax Rates

Payments Exempt from Withholding Tax

Certain payments fall outside the WHT regime entirely:

• Dividend payments
• Payments to Singapore branches of non-resident companies
• Payments by banks, finance companies, and certain approved entities
• Payments for the charter of ships

When Is Withholding Tax Due?

The filing and payment deadline is the 15th of the second month following the date of payment to the non-resident.

Example: You pay a foreign consultant on 10 March. Your WHT obligation is due by 15 May.

If you pay by GIRO, the deduction date is the 25th of the month the tax falls due.

What Counts as the Payment Date?

IRAS uses the earliest of three dates:

1. When the payment is due under your contract or invoice
2. When the amount is credited to the non-resident's account
3. The date of actual payment

This matters in practice. If your contract says payment is due on the 1st but you bank-transfer the funds on the 20th, the clock starts on the 1st. Many companies get this wrong and file late without realising it.

How to File: The S45 Form via myTax Portal

Filing is done electronically at mytax.iras.gov.sg using Corppass.

One-time setup: Your Corppass admin assigns the “S45 Withholding Tax (Filing)” digital service to the relevant staff. Set roles as Preparer (drafts the form) or Approver (reviews and submits to IRAS).

Filing steps:

1. Log in to myTax Portal with Corppass
2. Select “File S45 Form”
3. Enter payer tax reference, payee details, nature of payment, amount, and payment date
4. For DTA relief, select “Double Taxation Relief” and upload the non-resident’s Certificate of Residence (COR)
5. Preparer submits to Approver; Approver reviews and submits to IRAS
6. On approval, you receive a 14-digit payment slip number; use this to make payment if not on GIRO

File the form before remitting the payment to the non-resident. IRAS expects filing first; payment follows.

Double Tax Agreements: Reducing the Rate

Singapore has over 100 Double Tax Agreements (DTAs) with other countries. If your foreign vendor or director is tax-resident in a treaty country, they may qualify for a reduced WHT rate.

Common reduced rates under DTA:

To claim DTA relief, the non-resident provides a Certificate of Residence (COR) from their home country tax authority. You submit this when filing the S45 form.

One point worth stressing: you must still file the S45 form even when the DTA rate is 0%. Not filing because “no money goes to IRAS” is not compliant, and it’s one of the more common errors we see in new client accounts.

Common Mistakes Singapore Companies Make

These come up regularly in IRAS audits and account reviews.

Not deducting WHT at all. If you’ve been paying a foreign consultant or royalty holder without deducting WHT, your company is still liable for the tax, even after you’ve remitted the full amount to the non-resident. IRAS pursues the payer, not the recipient.

Using the wrong payment date. Many businesses use the actual bank transfer date. If your contract or invoice specifies an earlier due date, the clock starts there, not when you actually pay.

Ticking “Tax Borne by Payer” incorrectly. This applies only when your contract explicitly makes your company responsible for the full tax cost. If you’re deducting WHT from the non-resident’s payment, do not tick this.

Not filing when the DTA rate is 0%. Even a zero-rate WHT transaction must be reported on the S45 form. Skipping it is a compliance breach.

Forgetting WHT on non-resident director fees. Non-resident directors attract 24% WHT on director fees. This is easy to overlook when the director is permanently overseas and never in the office.

Applying 10% to non-resident public entertainers. The rate has been 15% since April 2022. If your company has been booking overseas performers, speakers, or emcees, verify the historical rate applied.

Penalties for Late or Non-Payment

IRAS issues a Demand Note if you miss the deadline. The initial late payment penalty is 5% of the tax outstanding. If the balance is not cleared by the date specified in the Demand Note, further penalties apply.

The administrative burden of managing a demand notice far exceeds the cost of filing and paying on time.

Frequently Asked Questions

What is withholding tax in Singapore? Withholding tax in Singapore is a tax the payer deducts from certain payments made to non-residents before remitting the balance. The payer files an S45 form with IRAS and pays the withheld tax directly to the authority. Rates range from 10% to 24% depending on the type of payment.

Do I need to withhold tax on SaaS or software subscriptions paid to overseas companies? Generally, no. Payments for SaaS, cloud services, and fully remote software services do not attract WHT because the underlying service does not create Singapore-sourced income for WHT purposes. Your obligation on these payments is GST via the reverse-charge mechanism for B2B imported services, not WHT.

What happens if I pay a foreign consultant without deducting withholding tax? IRAS holds your business liable for the WHT even if you’ve already paid the full gross amount to the consultant. You would need to top up the WHT from your own funds, pay IRAS directly, and settle any late payment penalties. The liability does not transfer to the consultant.

Can a Double Tax Agreement reduce my withholding tax rate to zero? Some DTAs reduce specific payment types to 0%, but you must still file the S45 form and provide the non-resident’s Certificate of Residence. Not filing is a compliance breach even at a 0% effective rate.

What is the withholding tax rate for non-resident directors in Singapore? Non-resident directors are subject to 24% WHT on their director fees in Singapore. This applies to directors who spend fewer than 183 days in Singapore in a calendar year.

When is withholding tax due in Singapore? WHT is due on the 15th of the second month following the date of payment to the non-resident. The payment date is the earliest of: the contractual due date, the date the amount is credited to the non-resident’s account, or the date of actual payment.

Need Help Getting This Right?

Withholding tax compliance is one of those areas where small errors compound. A wrong rate applied across two years of director fee payments, or WHT not deducted on technical service fees, can create a real liability when it surfaces in an audit.

If you’re unsure whether your current processes are correct, Harvest Accounting can review your accounts and put a clean workflow in place. Contact us to get started.