1. Are you eligible?

The higher rate SDLT refund — formally the replacement-of-main-residence relief under Schedule 4ZA of the Finance Act 2003 — applies in one specific situation. You qualify if all of the following are true:

• You bought a new property that was intended to be your main residence;
• At the time of that purchase, you already owned another residential property, so you paid the higher rate surcharge (3% before 31 October 2024, 5% from 31 October 2024 onwards) on top of the standard SDLT;
• You have now sold (or otherwise disposed of) the previous property that was your main residence;
• The sale of the previous home happened within three years of the purchase of the new one; and
• You're applying within twelve months of the sale of the previous home, or twelve months of the original SDLT filing date, whichever is later.

If all of those apply, you're eligible to claim the surcharge portion back. The refund is the difference between what you paid (with surcharge) and what you would have paid without it.

2. What to have ready before you start

The form runs much faster if everything is to hand. Gather these before you click "Start":

3. Section 1 — Contact details

HMRC starts with where you live and how to reach you. Five quick questions.

4. Section 2 — Transaction details (the new property)

This section is about the property where the higher rate was paid — i.e. the new main home you bought.

5. Section 3 — Previous main residence (the property you sold)

Now HMRC asks about the property you've sold — the one that was your main home before the move.

6. Section 4 — Tax assessment (the numbers)

This is the section where most people slow down — it asks for two SDLT figures that you may not have to hand.

7. Section 5 — Bank account details

Where HMRC pays the refund. This must be a UK account in the name of one of the original purchasers.

8. Section 6 — Check your answers and declaration

HMRC presents every answer you've given on a single page for review, with a "Change" link beside each. Read it carefully. Look particularly at:

• The two dates — purchase of new home and sale of previous home — and verify they're within three years of each other
• The UTRN — a typo here will cause the claim to fail to match HMRC's records
• The two SDLT figures, and the refund amount
• The bank account details, especially the account holder's name

The page also has a "Save or print a draft copy of your answers" link — use it. Save the PDF as proof of what you submitted.

Click Accept and submit. You should receive an on-screen confirmation with a claim reference, and the confirmation email shortly after.

9. After you've submitted: what HMRC will ask for

HMRC processes the refund on a "pay now, check later" basis. In most cases, you'll receive the refund into your nominated bank account within 6–9 weeks of submission, sometimes sooner. But HMRC also routinely follows up with a request for supporting documentation, often after the refund has already been paid. Be ready for this.

Documents HMRC commonly requests

For the property you paid the higher rate on (the new home):

• The contract for sale
• The signed TR1 (transfer of registered title)
• The completion statement from your conveyancer
• The SDLT5 certificate (or original SDLT return)

For the property you've sold (the previous main residence):

• The contract for sale showing the disposal
• The completion statement showing the date and proceeds
• Sometimes: evidence that it was your main residence (utility bills, council tax records, electoral roll registration covering the relevant period)

Typical timeline

• Same day: On-screen confirmation and email with claim reference
• 1–2 weeks: HMRC may write asking for supporting documents
• 4–9 weeks: Refund paid into your nominated account
• Up to 9 months later: HMRC may open a formal enquiry under section 9A FA 2003
• Up to 4–6 years later: HMRC may raise a discovery assessment to claw back the refund if anything looks irregular, with penalty exposure under FA 2007 Schedule 24

10. If something goes wrong

HMRC writes asking for documents you don't have

The most common requests are for the contract for sale, TR1, completion statement and SDLT5. If you can't find them, your conveyancer is the first port of call — they're required to retain SDLT-related documents for at least six years. If the firm has closed or merged, the Solicitors Regulation Authority can usually trace the successor practice.

HMRC challenges the main-residence status of the previous property

This is where claims most commonly fall apart. HMRC will look at evidence of where you actually lived: council tax registration, utility bills in your name, post addressed there, electoral roll registration, and the duration and pattern of occupation. If you have any of this evidence for the relevant period, gather it. If you don't, or if you have evidence that points the other way (e.g. council tax registered elsewhere), the claim is at risk and you should get advice immediately.

HMRC opens an enquiry

An enquiry is HMRC's formal investigation of the claim, opened by a written notice under section 9A FA 2003. The standard enquiry window is nine months from the date the amendment was submitted. If you receive an enquiry notice, do not respond off the cuff — get advice. The way you respond at this stage materially affects the outcome and any subsequent penalty exposure under Schedule 24 of the Finance Act 2007 (penalties for inaccuracies).

Note that the nine-month enquiry window isn't HMRC's only route. Under the discovery rules (section 29 TMA 1970, applied to SDLT by Schedule 10 FA 2003), HMRC can raise an assessment to claw back a refund up to four years after submission for honest mistakes, six years for careless behaviour, and twenty years for deliberate behaviour. This is the route HMRC most commonly uses to challenge refunds long after the formal enquiry window has closed, and it's where careless-inaccuracy penalties typically attach.

HMRC proposes a penalty

If HMRC concludes the original claim was inaccurate and you didn't take reasonable care, they can propose a penalty of 15–30% of the lost revenue (the refund itself plus interest). This is an area where the recent Cox v HMRC case ([2026] UKUT 00007 (TCC)) confirmed HMRC's broad discretion. If you receive a penalty proposal, this is no longer DIY territory — get a specialist involved before you respond.

11. When this isn't a DIY job

For most replacement-of-main-residence cases, the form above is straightforward and the refund arrives without incident. The cases where DIY filing carries real risk — and where the cost of getting it wrong outweighs the cost of professional handling — are the ones with these features:

• Main-residence status is genuinely debatable — you split time between two homes, were abroad for parts of the period, or have weak evidence of occupation
• Ownership has changed between purchase and sale — separation, divorce, equity release, transfer to or from a spouse, change in tenancy structure
• You retained any ownership or beneficial interest in the previous home after sale — for example, an option to repurchase, a side-letter, or an undisclosed share — or the sale was to family on non-arm's-length terms
• You bought through a company, trust, or partnership — Schedule 4ZA applies more strictly to non-natural persons
• You own additional residential properties — particularly abroad, or as inherited shares
• HMRC has already engaged — opened an enquiry, requested documents you can't find, or proposed a penalty
• Time limits are tight — close to or past either the three-year sale window or the twelve-month claim window

If any of these apply, the value of professional handling is twofold: the claim is built to withstand HMRC review at the time of submission (rather than patched up after), and if HMRC does come back, the response is handled by someone who knows the regime rather than left to you to deal with alone.

For straightforward cases — the substantial majority — there's no reason to pay anyone. Use this guide, file the form, keep your documents, and the refund will arrive.