Bought before you sold? The 5 per cent SDLT surcharge and how to get it back
If your new home completed before your old one sold, you almost certainly paid the 5 per cent higher rates for additional dwellings on the whole purchase price. On a £620,000 house that is £31,000 of extra tax. It is refundable if the old home sells within three years, but only if somebody actually claims it, and the window is shorter than most buyers realise.
Everything turns on what you own at the end of completion day
Stamp Duty Land Tax applies in England and Northern Ireland only; Scotland and Wales levy their own devolved taxes, whose surcharges and reclaim windows differ from what follows. The surcharge here is properly called the higher rates for additional dwellings, and since 31 October 2024 it has added five percentage points to every residential band. Against the thresholds in force since 1 April 2025, the standard scale of nil, 2, 5, 10 and 12 per cent becomes 5, 7, 10, 15 and 17 per cent. Your bill turns not on a loose sense of owning two homes. It is four statutory conditions in Schedule 4ZA to the Finance Act 2003, applied at the end of the effective date of your purchase, normally the day you complete. Walk them in order and the answer falls out.
Question one: is the price GBP 40,000 or more, and do you hold another dwelling
Condition A asks whether the chargeable consideration is GBP 40,000 or more, so a modest flat is caught even though the standard rates would produce no tax. Condition B asks that the interest you are buying is not reversionary on a lease with more than 21 years still to run. Condition C is the one people trip over: at the end of the day of your purchase, do you hold a major interest in some other dwelling, anywhere in the world, worth GBP 40,000 or more. Each dwelling is valued separately, so a share in a jointly owned house counts only for what that share alone is worth, and several small interests each below GBP 40,000 are not added together to break the threshold. One let-out sits in paragraph 16 of the Schedule: a share you inherited jointly with somebody else in the three years before your purchase is disregarded, provided your share, counted with your spouse or civil partner's, has never exceeded half of the whole in that period. A dwelling inherited outright gets no such disregard.
Question two: is this a replacement of your only or main residence
Condition D is the escape route. Five things must all be true. You, or your spouse or civil partner, disposed of a major interest in another dwelling in the three years ending with the day you complete; neither of you held a major interest in it immediately after that sale; it was your only or main residence at some point in those three years; you intend the new dwelling to be your only or main residence; and between that sale and this purchase neither of you acquired a major interest in any other dwelling intending it as your main home. Meet all five and Condition D fails, the purchase is a replacement, and no surcharge arises at all. The old home must have gone first, and that fifth limb is the quiet one: it catches people who sold, bought somewhere to sit out the market, then bought again. Spouses and civil partners living together are treated as one unit, so a purchase in a sole name is tested as though both were buying; if either would pay the higher rates, the whole transaction does.
If the old home has not sold, you pay now and reclaim afterwards
The chain moved, the new house completed, the old one is still on the market. At the end of completion day you hold two dwellings, Condition D is met, and the surcharge falls due on the full purchase price within 14 days of completion. There is no deferral and no discretion to waive it; the relief is preserved rather than lost. If you or your spouse or civil partner dispose of the previous main residence in the three years beginning with the day after completion, neither of you holds a major interest in it immediately afterwards, and it was your only or main residence at some time in the three years ending with your completion date, the transaction is retrospectively treated as a replacement and the surcharge becomes repayable. That last requirement is the one most often overlooked: a house you moved out of and let five years ago produces no refund. And nothing is automatic. HMRC does not monitor your sale, your conveyancer's retainer ended at the purchase, and the money sits unclaimed until somebody asks for it.
An illustrative worked example, computed band by band
The following figures are illustrative and not drawn from any client matter. Suppose you complete on a house at GBP 620,000 on 10 September 2026 while your existing home remains unsold. At the standard rates you pay nothing on the first GBP 125,000, 2 per cent on the slice to GBP 250,000 giving GBP 2,500, and 5 per cent on the remaining GBP 370,000 giving GBP 18,500, a total of GBP 21,000. At the higher rates you pay 5 per cent on the first GBP 125,000 giving GBP 6,250, 7 per cent on the next GBP 125,000 giving GBP 8,750, and 10 per cent on the remaining GBP 370,000 giving GBP 37,000, a total of GBP 52,000. The surcharge element is GBP 31,000, exactly 5 per cent of the price, because every band carries the same five point uplift. Your old home, which you lived in until the move, completes on 14 February 2028, inside the three year window, and the GBP 31,000 becomes repayable.
The deadline that quietly closes on unclaimed refunds
The claim is made by amending the land transaction return for the purchase. Paragraph 8(3) of Schedule 4ZA allows that amendment within a period of 12 months beginning with the effective date of the sale of the old home, or with the filing date for the return if that is later. The filing date is 14 days after completion, so the sale limb almost always governs; the other wins only where the old home completes within a fortnight of the new one. Read the statute rather than the summaries, because a period beginning with a date counts that date as day one. In the example above the sale completed on 14 February 2028, so the window closes at the end of 13 February 2029, not on the anniversary itself. Claim in the autumn and the point never arises. You apply through HMRC's online repayment service, or on form SDLT16 by post, giving the unique transaction reference number from the original return, the sale date and address of the old home, the tax paid and the amount sought.
When the three year window closes and you were genuinely stuck
Miss the three year disposal window and the surcharge is normally gone for good. HMRC may allow a longer period, but only where you were prevented from selling by exceptional circumstances that could not reasonably have been foreseen, and only where you then sold as soon as you reasonably could once the obstacle lifted. The examples HMRC gives are government restrictions or other action by a public authority preventing the sale. A collapsed chain, a change of mind, a shortage of funds and a simply difficult market are all expressly excluded. Two procedural points matter as much as the test. The application must be made within 12 months beginning with the date the old home was eventually sold, and if HMRC refuses there is no right of appeal. Do not approach HMRC before that sale completes. If the three years are running out and you have a real obstacle, gather the evidence as it happens rather than reconstructing it later.
Where the replacement relief simply does not exist
Companies never get it. A purchase by a company is tested against Conditions A and B alone, so the higher rates apply from the first residential property it buys, and no later sale of anyone's home rescues the position. Worse, where a company or other non-natural person buys a single dwelling for more than GBP 500,000, a separate charge under Schedule 4A can apply instead, taxing the whole consideration at a flat 17 per cent, subject to reliefs for genuine property rental and development businesses. Trusts need care. Where the buyer is a bare trustee, or the trust gives a beneficiary an interest in possession, HMRC looks through to that beneficiary, and the purchase can in principle replace their only or main residence. Trustees of any other trust, a discretionary trust included, are treated exactly as a company purchaser, whether individuals or a corporate body, so the replacement route is closed to them. Two questions are worth putting to your accountant before you sign. At the end of completion day, will you or your spouse hold any other interest in a dwelling worth GBP 40,000 or more, including anything inherited or held abroad. And does the property you are selling genuinely qualify as your only or main residence on the facts. The surcharge is arithmetic. The refund is admin. It is the admin that gets forgotten.
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This article is general information only and does not constitute tax advice. Figures and dates are current as at the date of writing; any worked example is illustrative. Always consult a qualified adviser before acting.