If you bought your new main home before selling your old one, you paid the 5% additional-property surcharge on completion — typically £20,000-£60,000 on a family-home purchase. That surcharge is refundable in full when you sell your previous main residence, provided the sale completes within 36 months of the new purchase's effective date. The deadline is strict and HMRC does not remind you. This page shows your refund amount, the exact deadline, and how to file.

How the surcharge refund works

The 5% additional-property surcharge exists because at the moment of completion on your new home, you owned two residential properties — the new one and your existing main residence. HMRC treats you as owning multiple properties and applies the surcharge. But if the new home is your replacement main residence, the surcharge is recoverable once the previous main residence is sold, so long as the sale happens within 36 months of the new purchase.

The refund equals the full surcharge you paid — typically 5% of the new home's price above the £40,000 entry threshold, calculated band-by-band. On a £500,000 purchase the refund is £30,000; on £750,000 it's £45,000. Not a rounding item.

The two deadlines you must not miss

Deadline 1 — Sell within 36 months of the new purchase

The previous main residence must be sold (completion, not just under offer) within 36 months of the effective date of the new home purchase. Effective date is usually the completion date. Miss this deadline and the refund is permanently lost — HMRC does not grant extensions except in exceptional circumstances (e.g., the previous home being subject to compulsory purchase orders that delay sale).

Deadline 2 — File the reclaim within 12 months of the sale

Once the previous main residence has sold, you have 12 months from the sale completion date (or 12 months from the original SDLT return filing date, whichever is later) to file the reclaim. Miss this and again the refund is permanently lost.

Between the sale and the file-by date is when 90% of permanent-loss cases happen. Set a calendar reminder for the day of sale — file within 30-60 days of completing the sale.

How to file the reclaim

Two routes. Both are straightforward.

Route A — file yourself via HMRC's online tool (free)

1. Go to gov.uk and search for "apply for stamp duty land tax refund"
2. Choose the "higher rates for additional properties" refund option
3. Enter: the property address, the SDLT return unique transaction reference (UTRN), the effective date of the new purchase, the sale completion date of the previous main residence, and buyer details
4. Upload evidence that the previous property was your main residence
5. Submit. HMRC typically processes valid reclaims within 15 working days.

The UTRN is on your original SDLT5 certificate — your conveyancer should have sent it to you at completion. If lost, your conveyancer can retrieve it.

Route B — instruct a specialist SDLT reclaim firm (paid, 15-25% fee typical)

Firms exist that will file the reclaim on your behalf, typically charging a percentage of the refund (15-25% is common). For simple cases this is expensive relative to the effort of Route A. For complex cases (divorce, inheritance, mixed residence history) a specialist can add real value.

Warning: some reclaim firms cold-contact recent buyers claiming they can secure additional refunds beyond the standard replacement-of-main-residence path. Most of these claims are speculative and can trigger HMRC enquiries. Use only established, regulated firms — check with the ICAEW or CIOT for member firms.

Evidence HMRC accepts

HMRC needs to be satisfied that the previous property was genuinely your main residence. Common evidence:

• Council tax bills addressed to you at the previous property
• Utility bills (gas, electric, water) in your name at that address
• Electoral roll registration
• Bank statements showing the address
• GP or dentist registration at the address
• HMRC self-assessment records showing the address
• Driving licence with the address
• Sale contract and completion statement for the previous property

2-3 documents from different categories is usually sufficient. For contested cases (previous home rented out, moved back in briefly, complex history), more evidence is needed.

Worked examples

Example 1 — Standard family move, £450,000 new home

Emma bought a £450,000 family home on 15 April 2026 before her previous £320,000 home sold. She paid £22,500 SDLT (£12,500 standard + £10,000 surcharge). Her old home completed on sale on 22 August 2026 — 4 months later, well inside the 36-month window.

• Sale deadline: 15 April 2029
• Sale completed: 22 August 2026 ✓ within window
• Claim deadline: 22 August 2027
• Refund: £10,000 (the surcharge element)
• Emma files via HMRC's online tool in September 2026 and receives the refund in early October 2026.

Example 2 — Slow chain, £600,000 new home

James bought a £600,000 home on 3 January 2026 before selling his £500,000 flat. He paid £50,000 SDLT (£20,000 standard + £30,000 surcharge). His flat took 30 months to sell — completing on 15 July 2028.

• Sale deadline: 3 January 2029
• Sale completed: 15 July 2028 ✓ within window (5 months to spare)
• Claim deadline: 15 July 2029
• Refund: £30,000
• Cash-flow lesson: James was £30,000 out of pocket for 30 months waiting for his flat to sell. Factor this into the "buy first, sell later" decision.

Example 3 — Missed the deadline, £750,000 new home

Priya bought a £750,000 house on 10 February 2025. She paid £72,500 SDLT (£27,500 standard + £45,000 surcharge). Her previous home hadn't sold by 10 February 2028 — the 36-month deadline passed. She sold in April 2028.

• Sale deadline: 10 February 2028 (missed by ~2 months)
• Refund: £0 — permanently lost
• Lesson: if the sale is close to the deadline, drop the asking price aggressively to complete inside the window. A 5-10% price cut is almost always worth it to preserve a £30k-£60k refund.

Example 4 — Same-day sale and purchase (no surcharge to reclaim)

Rebecca sold her £280,000 flat and bought her £425,000 house on the same day (26 March 2026). Because the sale and purchase completed simultaneously, she never owned two properties at the end of completion day. No surcharge was due at completion, so no reclaim is needed. This is the cleanest route and avoids the cash-flow problem.

Common reasons reclaims are refused

1. Previous property was not the main residence. If you rented for years and the previous property was BTL only, the reclaim doesn't apply.
2. Sale completed after the 36-month deadline. No exceptions except in narrow special circumstances.
3. Reclaim filed after the 12-month post-sale window. Also no exceptions.
4. Evidence insufficient. Especially where the previous property was owned briefly or rented out for a period.
5. Wrong UTRN or address details. Simple data-entry errors reject the claim; refile immediately.

Interaction with the non-UK resident 2% surcharge

Non-UK-resident buyers pay 2% on top of standard SDLT and, if additional-property, 5% on top of that. Both surcharges have separate reclaim paths:

• Additional-property (5%) — reclaim via replacement of main residence within 36 months
• Non-UK resident (2%) — reclaim via becoming UK-resident within 12 months of the new purchase

Both are independent — you may reclaim one, the other, or both. See the non-resident SDLT surcharge calculator for the residence reclaim path.

Cash-flow planning for the "buy first, sell later" scenario

The 5% surcharge is typically £20,000-£60,000 on family-home purchases. That's cash you must find at completion, then wait to reclaim after the previous home sells and the amendment processes. Practical implications:

• Budget the surcharge as real cash flow, not a paper adjustment. It sits with HMRC for months.
• Interest is not paid on the reclaimed sum. The opportunity cost is yours.
• Bridging finance or short-term loans exist to cover the surcharge but carry meaningful cost (typically 8-15% APR for short-term property bridges).
• Same-day sale-and-purchase (Example 4) avoids the problem entirely — coordinate with your conveyancer if feasible.

What if my situation is complicated?

Divorce or separation

Where the previous main residence is subject to a court order or financial remedy in divorce proceedings, the reclaim can still apply but the effective date of the sale may be affected by the court order. Take specialist advice.

Inherited property

Inheritance of a residential property doesn't count against you for the additional-property surcharge if your share is 50% or less AND the new purchase is within 3 years of inheritance. Beyond either threshold, the surcharge applies and the standard reclaim path is the only route back.

Rented-out previous home

A previous main residence that was later let out still qualifies for the reclaim provided it was genuinely your main residence at some point in the 3 years before the new purchase. Evidence of main-residence status (council tax, electoral roll, GP registration) during that earlier period is essential.

Company purchases

Companies do not get replacement-of-main-residence relief — the concept doesn't apply to corporate buyers. Company purchases of residential property are typically subject to the 15% or 17% flat rate on properties above £500,000 unless a relief applies (e.g., property rental business relief).

Frequently asked questions

Can I get a refund of the 5% SDLT surcharge?

Yes if you paid it on your new home and sold your previous main residence within 36 months. Refund equals the full surcharge amount — usually £20k-£60k on family-home purchases.

What is the deadline to claim the refund?

Sale of previous home: within 36 months of new-home completion. Claim filing: within 12 months of the sale (or 12 months from original SDLT return, whichever is later). Both are strict.

How do I file the reclaim?

HMRC's online tool at gov.uk/apply-stamp-duty-land-tax-refund. Free, straightforward, processed in 15 working days typically. Alternative: specialist reclaim firms (15-25% fee).

How much is a typical surcharge refund?

£20k on £400k, £30k on £500k, £45k on £750k, £60k on £900k. Meaningful cash flow, not a rounding item.

What if the previous home was rented out before I sold it?

Still eligible provided it was genuinely your main residence at some point in the 3 years before the new purchase. Evidence from the main-residence period is essential.

What if I inherited a share of another property?

Disregarded if share ≤ 50% AND purchase within 3 years of inheritance. Above either threshold, surcharge applies; reclaim via standard replacement-of-main-residence path.

Can HMRC refuse the refund?

Yes — for insufficient evidence, missed 36-month or 12-month deadlines, or the previous property not being genuinely your main residence. Get evidence right first time.

Do I need a solicitor to file?

No. HMRC's online tool is designed for direct buyer filing. Specialist firms exist for complex cases (typically £150-£400 fixed fee or 15-25% of refund).

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Last reviewed: 21 August 2026. Estimate only — always confirm SDLT with your conveyancer.