Reclaiming the higher rates after the three-year window

If you paid the higher Stamp Duty rates on a second home or buy-to-let and then sold your previous main home, you can usually reclaim the extra tax. The rule is that the sale has to happen within three years of buying the new home. The law sets that window as "the period of three years beginning with the day after the effective date of the transaction concerned"¹.

Where the sale takes longer, the refund does not disappear automatically. HMRC allows a claim outside the three years if you bought your new home on or after 1 January 2017, exceptional circumstances stopped the sale of the previous home, and that home has now been sold². You write to HMRC with an explanation of why the sale could not go through in time.

The refund itself is the difference between the higher rate you paid and the standard rate that would have applied to the same purchase. HMRC statistics show 6,900 additional dwellings refunds in the first quarter of 2025, totalling £136 million³. The amount you get back depends on your purchase price and the rates in force on your completion date.

When the higher rates can be refunded: selling your old home within three years

The higher rates exist because the tax system treats a second home as an extra. If you buy a new main home before selling the old one, you pay the surcharge on the new purchase, then reclaim it once the old home is sold. HMRC's own wording is that "if you sell or give away your previous main home in the 3 years after you buy your new home, you can apply for a refund of the higher rate part of your SDLT bill"⁶.

The same principle applies to buy-to-let. If you sell the property you were renting out within three years, you can claim back the difference between what you paid and the normal home mover rates⁷. The three-year clock runs from the day after completion on the new purchase, not from the date you filed the return¹.

Where the sale runs past three years, the exceptional circumstances route is the one to use. HMRC's guidance for the higher rates refund sets out three conditions that must all be met: the new home was bought on or after 1 January 2017, exceptional circumstances stopped the sale of the previous home, and the previous home has now been sold². The claim goes in writing, with an explanation of why the sale could not be completed within three years.

Refund deadlines: three months from the sale or 12 months from the filing date

Two deadlines matter, and which one applies depends on when you sold. For properties sold on or before 28 October 2018, HMRC must receive the refund request by whichever is later: three months after the date of sale, or 12 months from the filing date of the return².

For everything else, the practical limit is a year. HMRC's general refund guidance says you can apply "if you are within one year of the filing date for your SDLT return"⁶. One high street lender's guidance puts it as completing the claim within 12 months of the sale, or within 12 months from the date the Stamp Duty return was filed⁸.

There is a separate longstop for overpayment relief, which applies where more than a year has passed since the filing date but no more than four years since the effective date of the transaction⁶. That route is for tax paid that was not due at all, rather than the higher rates refund specifically.

Once a claim is in, HMRC has up to nine months to make a compliance check on your amended return or claim⁶. A repayment landing in your account does not mean HMRC has accepted the refund was due, and if you receive money that was not due you must pay it back along with any interest⁶.

The 5% surcharge you may be reclaiming

The surcharge on additional homes rose from 3% to 5% on 1 April 2025, across all bands⁵. Purchases completed before that date were charged at the lower rate, so the size of your refund depends on when you completed, not when you claim.

The surcharge sits on top of the standard rates rather than replacing them. In England, Wales and Northern Ireland, buyers are charged an extra 5% on top of the standard stamp duty rates⁹. Stamp Duty Land Tax is charged on a slice basis, so more expensive properties face progressively higher rates on the upper portions of the price⁴.

The refund is the difference between the higher rate paid and the standard rate for the same transaction. If you completed before April 2025, you are reclaiming the 3% element; if you completed after, you are reclaiming 5%. The rest of the bill stays payable.

There is a separate surcharge for non-UK residents. If you meet certain residence requirements after your transaction, you may be able to apply for a refund of the 2% surcharge for non-UK residents⁶. One lender describes the same rule as becoming a UK resident within 12 months after your purchase⁵.

How to apply for a Stamp Duty refund from HMRC

You can apply for a refund either by applying online or writing to HMRC⁶. The postal route works by amending your Stamp Duty return⁶. The online route requires signing in; the paper route uses form SDLT16, which you fill in, print and post to HMRC at the address shown on the form. The form cannot be saved part-completed².

For a claim outside the three-year window, the letter needs to explain why the previous main home could not be sold within three years, alongside the information in the form's "Before you start" section. The address is BT Stamp Duty Land Tax, HM Revenue and Customs, BX9 1HD².

For a postal claim, HMRC asks for your bank name, account number, sort code and the name of the account holder⁶. A lender's checklist for the same process adds your personal details, the main buyer's details if different, details of the property you paid higher-rate stamp duty on including the purchase date and transaction reference number, details of the former main home you sold including sale date, address and buyer's name, the amount of stamp duty originally paid, the amount you are claiming back, and bank account and sort code for the refund payment⁹.

The 11-character transaction reference comes from the original return, which is normally filed by the solicitor or conveyancer who handled the purchase¹⁰. HMRC pays any refund to you unless you give permission to pay it to someone else, such as your solicitor or agent⁶. If you pay an agent to claim for you, you are still responsible for checking that your claim is correct⁶.

Where the refund does not apply: Scotland, Wales and other exclusions

Stamp Duty Land Tax applies to England and Northern Ireland⁶. Scotland and Wales run their own property taxes, and the additional homes surcharge does not apply to purchases of land or buildings in Scotland or Wales¹¹.

Wales has Land Transaction Tax, and it has its own higher rate refund rule. The taxpayer has up to three years to sell their previous main residence and claim a refund¹². When a refund for a higher rates residential transaction is claimed, the original transaction is amended to a main rate residential transaction¹³. The Welsh Government has also set out a new refund rule for the higher residential rates of Land Transaction Tax where a private landlord buys a dwelling and then leases it to a local authority in Wales through Leasing Scheme Wales; the main residential rates of Land Transaction Tax will continue to apply¹⁴.

Scotland has Land and Buildings Transaction Tax and the Additional Dwelling Supplement, with separate rules and a separate refund process. If you bought in Scotland, the HMRC refund route described here is not the one to use.

Other exclusions are narrower. Stamp Duty does not apply when buying funds or exchange-traded funds, and shares in companies newly listed in the UK are exempt for the first three years¹⁵. A property left to you in a will does not need a Stamp Duty return¹⁶.