When is the deadline to pay Stamp Duty?

In England and Northern Ireland, Stamp Duty Land Tax has to be filed and paid within 14 days of the effective date of the transaction, which is usually the day of completion¹. The same 14-day window applies whether or not any tax is actually owed: a return is still required, and filing it produces an 11-character unique transaction reference number¹.

The clock does not start on the day the offer is accepted, or on exchange of contracts. It starts on the effective date, which HMRC defines as usually the date the transfer completes, though it can also be the date a contract is "substantially performed"¹. In practice most buyers never handle the return themselves: a solicitor or conveyancer usually submits it and arranges payment, often before completion, but the legal responsibility for making sure HMRC receives it on time and with the correct information stays with the buyer³.

Scotland and Wales run their own property taxes with their own deadlines. Land and Buildings Transaction Tax in Scotland and Land Transaction Tax in Wales both give 30 days after the effective date to submit and pay, rather than 14⁵. Missing any of these deadlines brings penalties and interest.

Stamp Duty deadline: 14 days from completion

The 14-day rule is set out in HMRC's own guidance and repeated across the industry. HMRC states that the return must be sent within 14 days of the effective date of the transaction, even if no tax is owed¹. A building society's step-by-step guide to the mortgage process puts it from the buyer's side: "As the buyer you will have 14 days to pay any stamp duty you owe"¹⁰. A lender's guide confirms the deadline in England and Northern Ireland is within 14 days of completion, the day the purchase officially transfers¹¹.

Fourteen days is short by the standards of most tax deadlines. Income Tax Self Assessment, for comparison, gives taxpayers until 31 January following the tax year to file a return and pay any remaining tax due¹². The property deadline is measured in days from a single event, not months from the end of a tax year, which is why the return is almost always prepared in advance of completion rather than after it.

The tax itself is charged on a slice basis, so more expensive properties face progressively higher rates on the portions above each threshold¹³. That structure is why the amount due is not simply a percentage of the whole price, and why the return needs the exact figures from the completed transaction rather than an estimate.

When the 14 days start: the effective date

The effective date is the anchor for everything else. HMRC's guidance says it is usually the date the transfer completes, and that it can also be the date the contract is "substantially performed"¹. Substantial performance is the point at which a buyer takes possession, pays most of the price or otherwise becomes entitled to the property, and it can fall before formal completion in some arrangements.

That matters because a return filed against the wrong effective date starts the 14-day clock in the wrong place. The date also drives the higher rates refund window: legislation sets the claim period for additional dwellings as within the period of 12 months beginning with the effective date of the transaction disposing of the major interest in the sold dwelling, with an application to HMRC for a longer permitted period possible under exceptional circumstances¹⁴.

There is a wider timing context too. Stamp Duty changes took effect on 1 April 2025, and UK Finance recorded that customers rushed to complete before those changes¹⁵. Buyers who completed around a threshold change still face the same 14-day filing window afterwards; the deadline does not move because the rates did.

Who files the return and pays, and how

Most buyers use a solicitor or conveyancer, and HMRC is explicit that this does not transfer responsibility. "Even if your representative sends us your return, you're still responsible for making sure we get the return on time and with the correct information"³. A lender's guide makes the same point: a solicitor will usually arrange the payment, often before completion, but it remains the buyer's legal responsibility to ensure the stamp duty is paid⁴.

Buyers who are not represented must use the SDLT1 paper return and send it to HMRC by post³. There is no online route for unrepresented taxpayers.

Payment methods HMRC accepts include approving a payment through online banking, paying online with a debit card or corporate credit card, making a bank transfer, or sending a cheque in the post². The payment has to reach HMRC within 14 days of the completion date¹⁶.

Penalties and interest if you miss the deadline

HMRC's position is direct: "We charge a late filing penalty and interest if your SDLT return is not filed on time"³. The same principle runs through HMRC's wider penalty guidance, which states that a penalty applies if a tax return is needed and the deadline for submitting it or paying the bill is missed, and that interest is charged on payments made after the deadline¹⁷.

The pattern is consistent across the UK's property taxes. Revenue Scotland warns that penalties and interest may be charged if an LBTT return is not submitted or the tax is not paid on time¹⁸. Where a civil penalty is issued for a fraudulent or negligent incorrect statement or declaration, payment must be made within 30 days and interest can be added¹⁹.

Scotland and Wales: different taxes, different rules

Stamp Duty Land Tax applies in England and Northern Ireland only¹³. Scotland has Land and Buildings Transaction Tax, and Wales has Land Transaction Tax. Both give 30 days rather than 14.

For Land Transaction Tax, the organisation paying the return has 30 days after the effective date to submit and pay⁵. A lender's guide states the same for buyers: in Scotland and Wales the equivalent payment must be made within 30 days of completing the sale²¹. A consumer guide notes that buyers in Scotland and Wales have 30 days to make the payment for the equivalent land taxes²².

For Land and Buildings Transaction Tax, Revenue Scotland sets out a further timing rule: if the return is submitted before the effective date, the tax is due on the earlier of the date the return is submitted and the filing date for the return¹⁸.

The difference is not cosmetic. A buyer moving from England to Scotland, or buying in both nations in the same period, is working to two different clocks with two different filing systems. The Land and Buildings Transaction Tax and Land Transaction Tax pages cover the returns themselves.

Claiming a Stamp Duty refund: the time limits

Refunds have their own deadlines, separate from the filing window. HMRC's guidance states that a refund can be applied for if the claimant is within one year of the filing date for the SDLT return⁹. HMRC then has up to 9 months to make a compliance check on an amended return or claim, and a repayment being made does not mean HMRC has agreed the refund is due⁹.

For the higher rates charged on additional dwellings, the claim window is different again. A lender's guidance says the claim must be completed within 12 months of the sale, or within 12 months from the date the stamp duty return was filed²³. For properties sold on or before 28 October 2018, HMRC must receive the request by 3 months after the date of sale, whichever of the listed dates is later²⁴.

In Wales, the higher rate refund window is longer. The taxpayer has up to three years to sell their previous main residence and claim a refund of the higher Land Transaction Tax rates⁸.

Where a refund is going to an agent rather than the purchaser, HMRC requires a covering letter and signed purchaser authority in JPEG or PDF format, maximum 5MB, plus a signed letter of consent from the main buyer²⁴. HMRC pays refunds to the buyer unless the buyer gives permission for payment to go to someone else, such as a solicitor or agent⁹.