Stamp Duty Surcharge Refund: Selling Your Old Home in Time

By Lisa Hayes · 16 September 2026

If you bought your new home before selling your old one, you almost certainly paid the higher rates of stamp duty — an extra 5% of the purchase price in England and Northern Ireland. You can claim every penny of that surcharge back, but only if your previous main residence sells within 36 months of the day you completed on the new one, and only if your claim reaches the tax authority inside a separate 12-month window. Miss either deadline and the money is gone for good.

That is the whole answer in three sentences. The rest of this guide covers the bit nobody explains properly: what happens when the old house won't sell, how the two deadlines interact, how the rules differ in Scotland and Wales, and the arithmetic that tells you whether accepting a lower offer is cheaper than losing the refund.

Why did I pay a stamp duty surcharge on my own home?

The higher rates for additional dwellings were introduced in April 2016 to cool the buy-to-let market. The rule is blunt: if you own more than one residential property at the end of the day you complete, you pay the surcharge. It does not care that you are an ordinary family moving house. It does not care that the second property is the home you lived in for fifteen years and are desperate to be rid of.

At the Autumn Budget 2024 the surcharge rose from 3% to 5% for transactions with an effective date on or after 31 October 2024. That single change nearly doubled the sum at stake for anyone caught in this position, and it is why the refund matters far more now than it did a couple of years ago.

The surcharge applies to every slice of the price, including the slice that would normally be taxed at zero. So on a £350,000 purchase you pay the standard £7,500 plus £17,500, for a total of £25,000. Buying before selling turned a £7,500 tax bill into a £25,000 one.

• 5%surcharge on the full price (England & NI)
• 36 monthsto sell your previous main residence
• 6,900refunds paid in one quarter (Q1 2025)
• £136mrefunded in that quarter alone

Those last two figures come from HMRC's own quarterly SDLT statistics, and they are worth sitting with. Divide one by the other and the average refund works out at roughly £19,700 per household. That is not a rounding error. For most people it is the single largest sum of money hanging on how quickly one property sells.

How much money will I actually get back?

Here is the part that surprises people. In England and Northern Ireland the refund is not a complicated calculation. Because the surcharge is a flat five percentage points on every band, the refund is simply 5% of the price you paid for your new home. Nothing else affects it.

Figures use the residential SDLT bands in force since 1 April 2025: nil rate to £125,000, then 2% to £250,000, then 5% to £925,000. If you were also a non-UK resident you paid a further 2% on top. That surcharge has its own separate refund route and is not covered by the higher-rates claim.

Find the price you paid, multiply by 0.05, and that is the cheque. Now you know what the deadline is worth.

How long do I have to sell my old home?

Thirty-six months from the effective date of the new purchase — in almost every case, the day you completed and got the keys. Not the day you exchanged, and not the day your offer was accepted.

The qualifying event is the sale completing, not going under offer. A buyer who has exchanged but not completed on day 1,095 does you no good whatsoever. If your three years are nearly up, work backwards from the completion date you need and be ruthless about how long conveyancing actually takes, which in a normal chain is routinely twelve to sixteen weeks from accepted offer to completion. If you are inside six months of your deadline and not yet under offer with a proceedable buyer, you are already in trouble.

One condition people forget: the property you sold must genuinely have been your only or main residence at some point in the three years before you bought the new one. A buy-to-let you happened to dispose of does not qualify. Neither does a holiday home. It has to be somewhere you actually lived.

What is the deadline for the claim itself?

This is the trap, and it catches people who did everything else right.

Selling inside 36 months makes you eligible. It does not get you paid. HMRC must physically receive your refund request by whichever of these two dates is later:

• 12 months after the date of sale of the previous main residence, or
• 12 months after the filing date of the SDLT return for your new home. The return is due 14 days after completion, so this clock runs out roughly twelve months and two weeks after you moved in.

If you sell late in the window — month 30, say — then the twelve-months-after-sale clock is the later of the two and gives you until month 42. Either way the honest advice is identical: claim within days of completion, not months. There is no benefit to waiting and no partial credit for being late.

How do I claim the stamp duty refund?

You do it yourself, online, free, in about twenty minutes. HMRC has a dedicated service for this. You do not need your conveyancer, an accountant, or a "reclaim specialist".

• Step 1 — dig out the UTRN. Your SDLT return has a unique transaction reference number. Your conveyancer holds it. Email them and ask for the SDLT5 certificate for the purchase; the number is on it.
• Step 2 — confirm both effective dates. You need the completion date of the purchase and the completion date of the sale. Use the completion statements, not memory.
• Step 3 — work out the figure. SDLT paid, minus what would have been due at standard rates. In England and NI that difference is 5% of the purchase price.
• Step 4 — gather the buyer's details. HMRC asks for the name of the person who bought your old home and its full address.
• Step 5 — have bank details ready. You cannot save the online form part-way through, so assemble everything first, then start.
• Step 6 — submit. Use HMRC's online refund service, or fill in form SDLT16 and post it if you cannot use the online route.

If your case relies on exceptional circumstances, covered below, you cannot use the standard form. You write to BT Stamp Duty Land Tax, HM Revenue and Customs, BX9 1HD, explaining what stopped the sale and enclosing the same information.

How are the rules different in Scotland and Wales?

Stamp duty is devolved, so the refund you are chasing depends on where the property you bought sits. Get this wrong and you will be filling in the wrong form at the wrong agency.

Scotland. The Additional Dwelling Supplement rose from 6% to 8% in December 2024, making it the harshest surcharge in the UK: an extra £28,000 on a £350,000 purchase. The replacement window was extended from 18 to 36 months for transactions with an effective date on or after 1 April 2024, so check which regime your purchase falls under before you assume you have three years. Claims go through Revenue Scotland's SETS system — your original conveyancer amends the return, a new agent uses form RS-0005, or you claim directly through the online taxpayer service. Revenue Scotland repays ADS with interest, which is more than HMRC's guidance promises. Claims made more than 12 months after the filing date need documentary proof of sale: a disposition, Land Registration documents, or a solicitor's letter clearly stating the sale date.

Wales. The WRA does not use a flat add-on. Wales has its own higher-rates table — each band was raised by a percentage point on 11 December 2024, so it now opens at 5% on the first £180,000 — and your refund is the higher-rate figure minus what you would have paid at main rates. Use the WRA's own LTT calculator, set to the date you bought, to get the number right. Wales is also stricter on evidence than HMRC: you must upload a signed and dated TR1, TP1 or contract of sale for the property you sold. An unsigned TR1, or the TR1 for your new house, will be rejected outright. The claim window mirrors the others — 12 months from the sale, or from the return's filing date, whichever runs longer — but confirm the exact date with your conveyancer, because the Welsh amendment rules have their own wrinkles.

What counts as "replacing your main residence"?

More claims fail on this definition than on the deadlines. The awkward cases:

• Married couples and civil partners are treated as one unit for these rules, even if only one name is on a deed. If your spouse retains a property, you may not be replacing a main residence at all.
• Joint buyers. For SDLT, the surcharge bites if any buyer owns another property. In Scotland, for transactions from 1 April 2024, only one of the buyers now needs to meet certain of the repayment conditions — a genuine easing that still catches agents out.
• Separating couples. If the old home is caught up in a financial settlement and the transfer happens later, the 36-month clock does not pause for the court timetable. This is one of the most common ways people lose the money, and it is worth raising with your solicitor early. See our guide to selling a house after or before divorce.
• You rented the old home out in the meantime. Letting it does not automatically kill the claim, provided it was genuinely your main residence at some point in the three years before the new purchase. It may, though, create a capital gains question on the way out — see how to handle CGT when selling a UK property.
• Inherited property. A house you inherited was never your main residence, so selling it does not trigger a refund on a surcharge you paid elsewhere. Different rules, different guide: selling an inherited property.

Do "exceptional circumstances" get me an extension?

They can, and the bar is far higher than most people hope.

HMRC will consider a late claim if you bought on or after 1 January 2017, exceptional circumstances stopped you selling within three years, and you have since sold. But the guidance is unusually direct about what does not count. Events that "normally occur when buying and selling property" are excluded, and HMRC names them: not finding a buyer at the price you want, delays agreeing terms with a buyer, and the breakdown of a chain.

Read that again if you are currently telling yourself a collapsed chain will buy you extra time. It will not. The circumstances HMRC has in mind "usually affect large groups of people and not only the buyer or seller in an individual transaction" — government-imposed restrictions on selling, or an action by a public authority that stops the sale. Pandemic lockdowns qualified. Your buyer's mortgage falling through does not.

Wales has gone a step further, legislating for an extension where truly exceptional cladding problems prevented a sale completing sooner. If you are selling a flat with fire-safety issues in Wales, that is worth investigating properly. Everyone else should plan on the basis that 36 months means 36 months.

There is a sting in the tail, too. Even where exceptional circumstances apply, you must sell "without further delay once the reason for the original delay has ended". You cannot use a past obstacle to justify a leisurely sale afterwards.

What if my old home simply won't sell before the deadline?

This is the real question behind most searches on this topic, and it deserves a straight answer rather than a shrug.

Start by reframing it. You are no longer asking "how do I get the best price?". You are asking "what net sum leaves me best off by a fixed date?" — and the refund is part of that sum. Once the refund goes on the scales, offers you would have dismissed six months ago start to look different.

Work the arithmetic on your own numbers. Say you paid £350,000 for the new house, so £17,500 is riding on the deadline, and your old home is valued at £250,000 but has sat unsold for a year.

On these figures a 6% price cut leaves you better off than holding firm and losing the refund — and that is before you count the carrying costs of an empty second home. Council tax on an empty property can be charged at a premium, you are insuring it on a specialist unoccupied policy, and if there is still a mortgage on it you are paying two. Add six months of that and the maths tilts further. We set out those running costs in full in our guide to selling an empty house.

Run the same table with your own figures before you reject anything. Your break-even discount is simply the refund divided by the value of the old home — in this example, 7%.

Your practical options, in the order I'd try them

• Price it to sell, properly. Not a £5,000 trim. A price that puts you at the top of a portal search bracket rather than the bottom of one. If it has been on the market twelve months, the price is the problem, not the photographs. Our guide on how to sell a house that won't sell runs through the diagnostics.
• Get a realistic number first. Portal estimates are algorithms, not valuations. Start with what your house is actually worth and a free house valuation so you are negotiating from evidence rather than hope.
• Auction. A defined completion date is the attraction; the risk is that the date may still fall outside your window, and the fees are not trivial. See selling a house at auction.
• A genuine cash buyer. Completion in 7–28 days, no chain, no mortgage to fall through. You will not get full market value, so understand exactly what percentage of market value cash buyers pay before you engage, and compare firms via the best house buying companies and verified cash house buyers.
• An assisted sale. A middle route that aims closer to market value with support through the process — details on assisted house sale.

A word of caution on the fast routes. The danger is not the discount, which you can calculate in advance. It is the firm that agrees a headline price, sits on it, then reduces the offer a fortnight before completion, knowing you have a deadline and no time left to start again. Deadline pressure is precisely the condition price-chipping relies on. Get the offer in writing, ask what the funds are and who holds them, and check the company's track record before you take the property off the market. Our guide to selling a house fast covers how to test a buyer properly.

Should I use a stamp duty refund company?

No. Claim it yourself.

HMRC has publicly warned homeowners about cold-calling repayment agents who find new owners through Land Registry records and property websites, then push speculative refund claims. The pitches vary — that the property was uninhabitable and should have been taxed at non-residential rates, that multiple dwellings relief applies, that a communal garden changes the rate — and HMRC's own analysis suggested a large share of those claims were simply wrong. When HMRC later opens an enquiry, the agent has taken their percentage and you are left repaying the tax, sometimes with penalties on top.

The replacement-of-main-residence refund described here is a different animal: a clean, well-defined entitlement with a form built specifically for it. If you qualify, you can claim it directly, at no cost, and no agent is required. Anyone offering to do it for 25% of the proceeds is charging you thousands of pounds for twenty minutes of typing.

The one situation worth paying for advice on is genuine complexity — a trust, a company purchase, a contested divorce settlement, a mixed-use property. Then you want a regulated tax adviser or your conveyancer, on a fixed fee. Not a contingency-fee reclaim specialist who found you through a cold call.

The mistakes that cost people the money

• Assuming the conveyancer will handle it. Most will not unless you ask and pay. The firm that acted on your purchase has no involvement in your later sale and no way of knowing it happened. Nobody is watching your deadline but you.
• Holding out for the "right" price until month 30. The clock does not care about your valuation. By month 30 you need a buyer who can complete inside six months, and that pool shrinks the closer you get.
• Counting exchange as the finish line. Only completion stops the clock.
• Forgetting the second 12-month window. The commonest failure of the lot: sold in good time, claimed too late.
• Letting a fast-sale firm renegotiate at the eleventh hour because they know your deadline. Never tell a buyer how much time you have left.
• Not budgeting for the gap. The refund is money you already paid out. It will not fund your move; it reimburses you months afterwards. Plan your selling costs on the assumption the refund lands late.
• Ignoring a wobbling chain. If your sale looks unstable, act early rather than watching it die — our guide on what to do when a chain collapses sets out the rescue options.

A sensible timeline if you're in this position now

• Months 0–3 after buying: get the old home on the market, properly priced. Note the 36-month completion deadline in your calendar with a reminder at month 24.
• Month 12: if it is not under offer, the price is wrong. Reduce meaningfully or change agent.
• Month 18: if it is still unsold, start collecting comparison offers from cash buyers and auction houses so you know what your fallback actually pays. Getting a figure costs nothing and commits you to nothing.
• Month 24: decision point. A conventional sale needs roughly four to six months from here. If you are not under offer, choose your fallback now rather than at month 33.
• Month 30: if you have not exchanged, take the certain route. The refund is worth more than the last few per cent of price.
• The week you complete: file the refund claim. That week. Not "soon".

Then keep everything in one folder until the money lands: the SDLT5 for the purchase, both completion statements, and the signed TR1 for the sale.

The bottom line

The stamp duty surcharge refund is one of the few pieces of UK property tax that is genuinely simple. Sell in time, claim in time, get 5% of your purchase price back. Everything that goes wrong goes wrong for one of two reasons: a house sat unsold while a clock ran down, or a form never got filed.

If your old home is still on the market and the deadline is in sight, the useful thing to do today is find out what a certain sale is actually worth to you. Compare what the open market is likely to deliver, and when, against a guaranteed completion date from a verified buyer — then put the refund on the scales and see which column wins. You can compare cash offers here with no obligation, and we will tell you plainly if holding out is the better call.