How to Pay Stamp Duty in Singapore via IRAS: Filing, Payment and Proof

The key point for agents is that stamp duty attaches to a dutiable document, so IRAS needs the document details before it can determine what is due. In a property deal, that usually means the lawyer or authorised filer starts with the relevant instrument, such as the sale and purchase agreement, transfer, or tenancy agreement.

A simple way to explain the process to clients is: file, pay, save proof. That matters because many clients assume they can jump straight to payment. In practice, the record has to be created and the duty has to be assessed before the payment stage is meaningful.

Typical workflow in practice:

• the document details are submitted through IRAS e-Stamping
• IRAS assesses the duty based on those details
• payment is made through the available payment stage in the IRAS flow
• the IRAS stamp certificate or official acknowledgement is downloaded and kept

Agent takeaway: do not treat a bank transfer screenshot as the end of the process. The file is only clean when the IRAS proof is back. For the official route, use IRAS' e-Stamping and where to e-Stamp documents. For the broader duty types, see Singapore Property Stamp Duty Explained: ABSD, BSD and SSD.

Agents should separate two questions early: who is legally responsible for the duty, and who is actually handling the admin.

In most purchase transactions, buyer-related duties are usually borne by the buyer, while the buyer’s lawyer or conveyancing team handles the IRAS filing and payment using client funds or payment instructions. Where seller-side duty issues arise, the seller side usually bears them and the seller’s legal team usually handles the stamping steps. For leases, the tenant commonly bears the duty unless the tenancy terms allocate it differently.

The practical mistake to avoid is assuming the person who files is the person who bears the duty. They are often not the same. If the contract allocates payment responsibility differently, the contract wording and lawyer’s instructions should override assumptions. IRAS' Who should pay stamp duty is the official starting point. For a broader overview, see Which Property Documents Need Stamp Duty in Singapore?.

Most delays happen before payment, not during payment. The issue is usually missing or inconsistent information in the stamping record.

The common items to prepare are:

• the signed dutiable document, such as a sale and purchase agreement, tenancy agreement, or transfer instrument
• the document type being stamped
• the contract or signing date shown on the instrument
• the parties’ names exactly as they appear on the document
• the transaction details needed for assessment
• any reference numbers the lawyer or conveyancing team needs
• the filer’s access, such as Singpass or business account access where applicable

A practical agent check is to compare the signed document against the details being passed to the lawyer. If the purchaser’s or tenant’s name is abbreviated in one place and written in full in another, or the wrong instrument type is being used, the filing may need correction before payment can proceed.

Short insight: most stamping problems are data-quality problems. For a separate document-by-document guide, see Which Property Documents Need Stamp Duty in Singapore?. For a broader overview, see When to Pay Stamp Duty After Exercising the OTP in Singapore.

Keep the process high-level and operational, because portal labels can change. In practice, the workflow usually looks like this:

1. The filer logs in to the IRAS stamping service.
2. A new stamping record is created, or an existing draft is opened.
3. The filer enters the document details, including the correct parties, document type, and transaction information.
4. IRAS assesses the duty based on the submitted details.
5. The payer completes payment through the available payment step.
6. The IRAS stamp certificate or official acknowledgement is downloaded and saved.

Where agents add value is not by manually calculating every case. It is by checking that the details going in are correct and that the responsible party is ready to pay when the filing reaches that stage.

Three useful coordination checks:

• confirm the exact document being stamped
• confirm who is funding or authorising payment
• confirm who will send the IRAS proof back after payment

If the amount assessed looks materially different from expectations, pause and verify the filing inputs before treating the payment stage as a mere admin step. For the current service entry points, use IRAS' digital Stamp Duty services and its frequently used e-Stamping guides. For a broader overview, see What Happens If Stamp Duty Is Paid Late in Singapore?.

After the document details are accepted and the duty is assessed, payment is usually completed within the IRAS stamping process. Older guides and current practice may refer to channels such as GIRO, PayNow QR, AXS, or internet banking-type payments, but agents should not rely on memory or old screenshots because the available options can change.

Practical agent guidance:

• if the lawyer is handling payment, ask whether the client needs to top up funds or approve payment instructions
• if the client is paying directly, make sure the client has the needed banking or app access ready before the payment step opens
• if multiple parties are involved, confirm who will actually make the payment so the file does not stall at the last minute

A useful client-facing line is: “Do not prepare only the money; prepare the payment access too.” That is often the real bottleneck.

For official guidance, refer clients to IRAS' e-Stamping page or the IRAS pay stamp duty guide PDF. For a broader overview, see How to Calculate Buyer's Stamp Duty in Singapore: Rates, Purchase Price, and Valuation Basis.

For transaction records, the safest document is the IRAS-issued proof of stamping. That is the record most worth keeping if there is a later question from a client, lender, internal compliance team, or another professional on the deal.

What to request for the file:

• the IRAS stamp certificate PDF or official acknowledgement
• the document or transaction reference number
• the payment date
• the stamped instrument, if the conveyancing team provides it
• any supporting bank receipt only as secondary backup

A common agent scenario is receiving only a PayNow screenshot from the client. That is not ideal as the final file copy because it shows money movement, not necessarily completed stamping. The safer follow-up is: “Thanks, please also send the IRAS stamp certificate once issued.”

Insight line: the IRAS record is the file copy that matters.

The best reminder timing is tied to transaction milestones, not just completion week. In practice, that usually means reminding the client when the OTP is exercised, when the sale and purchase agreement is signed, or when the tenancy is signed.

A workable agent workflow is:

• first reminder once the relevant document is signed or exercised
• second reminder if the lawyer or filing party has not confirmed payment or submission
• final check before completion, handover, or key collection coordination

Do not give one blanket deadline for every case. The applicable timing depends on the type of document and where it was executed or received, so the safer move is to ask the lawyer or filer to confirm the specific IRAS deadline for that instrument.

Client-facing explanation: “Once the paperwork is done, stamping should move quickly too. We just need to confirm who is filing and when the IRAS proof will be issued.”

For timing context, see When to Pay Stamp Duty After Exercising the OTP in Singapore.

Start with the assumptions used in the filing. A duty amount can differ from a client’s rough expectation if the assessment is being based on a different transaction value, market value basis, ownership setup, or instrument type from what the client had in mind.

Ask the lawyer or conveyancing team to confirm:

• what document was actually stamped
• what transaction details were entered into IRAS
• whether the duty was assessed on a market value basis or another basis relevant to the instrument
• whether any relief, remission, trust arrangement, or unusual transfer structure is in play

For agents, the right script is usually: “Let’s confirm the filing basis first, then we can see why IRAS assessed it that way.” That keeps the conversation factual and avoids overcommitting on tax treatment.

If the question is really about buyer-side amount mechanics, send the client to How to Calculate Buyer’s Stamp Duty in Singapore. If the structure is unusual, treat it as a lawyer-led verification issue rather than a quick admin clarification.