What happens if I don't pay Stamp Duty on time?

Stamp Duty Land Tax is a government tax on property purchases in England and Northern Ireland, charged on a sliding scale once the price passes a minimum amount set by the government, which can change at any time¹. It is charged on a "slice" basis, so more expensive properties face progressively higher rates². The return and any tax are both due within 14 days of the effective date of the transaction, which for most buyers is completion³.

Miss that deadline and HMRC charges a late filing penalty and interest³. Independent guidance on moving costs puts the automatic fine for failing to pay on time at £100 in England and Northern Ireland⁴. The tax cannot be paid in instalments: it has to be paid in full to the government within 14 days of buying the property⁵.

The 14 days is a hard window, and it applies whether or not you have a solicitor doing the paperwork. Even when a representative sends the return, you remain responsible for making sure HMRC gets it on time and with the correct information³. This page sets out what the deadline is, what a late return or payment costs, how weekends and bank holidays affect the date, who is responsible when a solicitor handles it, and how Scotland and Wales differ.

The deadline: return and payment within 14 days of completion

The clock starts on the effective date of the transaction. HMRC's guidance is that you must send the SDLT return and pay any tax within 14 days of that date³. Independent guidance for buyers states the same rule in everyday terms: Stamp Duty must be paid within 14 days of completion⁸. It is payable at the point of completion⁹.

Two things are due inside that window, and they are separate obligations. The return is the document that tells HMRC what was bought, for how much, and what tax is due. The payment is the money itself. HMRC charges a late filing penalty and interest if the return is not filed on time, so a return that arrives late can cost money even where the tax was paid³.

If you are not represented by a solicitor or conveyancer, you must use the SDLT1 paper return and send it to HMRC by post³. That matters for anyone buying without professional help, because the online route is not open to unrepresented taxpayers.

A return is not only for purchases where tax is due. HMRC's guidance on when a return is needed covers situations such as taking over a property and paying money or taking on a debt, for example a mortgage, for the property¹⁰. Where a property was left to you in a will, that is listed among the situations where a return is not needed¹⁰.

Penalties and interest HMRC can charge

The core rule is short and firm: HMRC charges a late filing penalty and interest if your SDLT return is not filed on time³. Independent guidance on the unexpected costs of moving records the automatic fine for failing to pay on time as £100 in England and Northern Ireland⁴.

Beyond that headline figure, the published penalty scales that apply to HMRC tax returns generally give a sense of how costs escalate. HMRC could automatically charge £100 if a return is up to 3 months late¹¹. At 12 months late, an additional £300 fine applies, or 5% of the tax due if that is higher, plus the earlier penalties¹¹. There is also interest on any late payment of tax¹².

The same pattern appears in the late payment rules for income tax. Between 16 and 30 days overdue, a 3% penalty applies on the tax owed at day 15 for the 2025 to 2026 and 2026 to 2027 tax years¹³. After 12 months, an additional 5% applies¹¹. Where a payment date has passed, HMRC will charge interest on the late payment¹⁴.

Two points of caution. First, these scales are published for Self Assessment and income tax, and no equivalent full penalty ladder specific to SDLT is given, so they show the general shape of HMRC late penalties rather than a precise SDLT tariff. Second, the figures reported for the 5% penalty differ: one source describes a 5% penalty for tax unpaid 11 months after the due date, another for tax unpaid five months after the due date, and the two are not reconciled. Both figures are reported here as they stand.

How the effective date and weekends affect the deadline

The deadline runs from the effective date of the transaction, not from the day you move in or the day your solicitor sends the paperwork³. For most buyers that date is completion, which is why the 14 days is often described as running from completion⁸.

Weekends and bank holidays do not extend the window in the way people sometimes assume. HMRC's rule for payments is that if the payment deadline falls on a weekend or bank holiday, the payment must reach HMRC on the last working day before it, unless you are paying by Faster Payments¹⁶. The identical wording is used for voluntary Class 2 National Insurance contributions¹⁷.

The practical effect is that a deadline landing on a Saturday, Sunday or bank holiday should be treated as falling on the previous working day, so the money needs to be with HMRC earlier than the calendar suggests. The same principle appears in other official time limits: for data protection rights requests, if the end date falls on a Saturday, Sunday or bank holiday, the period ends on the next working day¹⁸. That is the opposite direction from the payment rule, which is exactly why the payment rule is worth checking rather than assuming.

Who is responsible when your solicitor handles it

In most purchases the solicitor or conveyancer deals with the tax. You pay your solicitor or conveyancer and they pay it to HMRC¹⁹. Your solicitor will usually arrange the payment for you, often before your purchase is completed, but it is your legal responsibility to ensure that your stamp duty is paid⁶.

That split matters if something goes wrong. Even if your representative sends the return, you are still responsible for making sure HMRC gets the return on time and with the correct information³. The same principle applies to refunds: if you pay an agent to claim for you, you are still responsible for checking that your claim is correct²⁰.

There is a separate protection worth knowing about if a payment goes astray in the banking system. Under the Payment Services Regulations 2017, a payment service provider is liable to its payment service user for any charges for which the user is responsible and any interest the user must pay as a consequence of a delay under regulation 86(2B), whether or not the payment order is ultimately executed²¹. That rule sits in the payments framework rather than in tax law, and it is about delays in the payment chain, not about a buyer simply missing the deadline.

If a conveyancer fails to pay tax they have collected, the buyer's position is different from a straightforward late payment, and it is worth taking advice quickly rather than waiting for HMRC to make contact.

Scotland and Wales: different taxes, different rules

Stamp Duty Land Tax applies in England and Northern Ireland only⁷. There are different versions of the tax in Scotland and Wales²³, and stamp duty costs are different in both nations²⁴. Stamp duty rates and thresholds are different in Scotland and Wales²⁵.

In Scotland the tax is Land and Buildings Transaction Tax, administered by Revenue Scotland. Its guidance states that you may be charged penalties and interest if you do not submit or pay your tax return on time²⁶. The Scottish penalty structure includes a second late payment penalty where tax is not paid within 5 months of the first late payment penalty date²⁷.

For additional properties, the surcharges differ in Scotland and Wales, although the rules around replacing a main residence still apply²⁸. That means a buyer with a second home or a buy-to-let in Scotland or Wales is working to a different set of rates and thresholds from a buyer in England or Northern Ireland, even where the underlying principle, pay on time or face a penalty, is the same.

The practical consequence is that the 14-day figure and the £100 automatic fine are England and Northern Ireland rules³. Anyone buying in Scotland or Wales should check the deadline and penalty rules that apply to their transaction rather than carrying over the English figures.

If the property came to you another way

A property left to you in a will is listed among the situations where you do not need to send a Stamp Duty Land Tax return¹⁰. That removes the SDLT filing obligation in that case, but it does not mean no tax deadline applies to the estate.

Inheritance Tax can carry interest after the due date²⁹. Separately, you may have to pay a penalty if you are late handing in returns or late paying income tax³⁰. Those are different taxes with different deadlines, and they can arise at the same time as a bereavement, which is when deadlines are easiest to miss.

If you are dealing with an estate and are unsure what is due and when, free and impartial help is available. TaxAid provides tax information for people who are struggling, including on problems paying a tax debt and on tax enquiries¹⁴. Business Debtline publishes guidance on income tax debt³⁰. Both are worth contacting before a deadline passes rather than after.

Where to get help

If a Stamp Duty deadline has passed or is about to, the first step is to establish which tax applies and what has actually been filed. HMRC's guidance on sending a return sets out the online and paper routes and the 14-day rule³. Its guidance on refunds explains how to apply online or by writing, and warns that a repayment is not agreement that the refund was due: if you receive a repayment where the amount you claimed was not due, you must pay it back along with any interest due²⁰.

For anyone who cannot pay, the general HMRC position is that interest runs on late payment of tax¹², and penalties can follow missed deadlines for sending requested information¹². Free, impartial help exists: TaxAid covers problems paying a tax debt and tax enquiries¹⁴, and Business Debtline covers income tax debt³⁰. StepChange provides guidance on mortgage arrears if a late tax bill is sitting alongside mortgage pressure¹⁵.

If you are buying and want to see how the tax fits into the wider picture, the costs of buying a house page sets out the other bills that arrive around completion, and Stamp Duty Land Tax in England and Northern Ireland explains how the charge itself is worked out. The deadline to pay Stamp Duty page covers the timing question in more detail, and what to do if your conveyancer fails to pay property tax deals with the situation where the money left your account but did not reach HMRC.