UK Stamp Duty Explained (2025/26)

What Stamp Duty Land Tax actually is

Stamp Duty Land Tax (SDLT) is the tax you pay HMRC when you buy a residential or commercial property in England or Northern Ireland. It is charged on the price you pay, in tiered slices, and falls on the buyer — not the seller. The conveyancing solicitor calculates it, files the SDLT return, and pays HMRC out of completion funds, all within 14 days of completion. Miss the deadline and HMRC applies a £100 penalty automatically, even if no tax was owed.

Scotland and Wales each have their own equivalents — Land and Buildings Transaction Tax (LBTT) in Scotland, Land Transaction Tax (LTT) in Wales — administered by Revenue Scotland and the Welsh Revenue Authority. The bands, surcharges, and reliefs are different in each, so an English SDLT calculation is not transferable. The UK stamp duty calculator on Calc Dragon applies the post-April-2025 SDLT regime for England and Northern Ireland; if your purchase is in Edinburgh or Cardiff, the right starting point is your jurisdiction's tax authority.

SDLT is the single largest one-off cost most people meet on a property purchase outside the deposit. On a £500,000 home an additional-property buyer pays £40,000 in SDLT alone — eight per cent of the price, before legal fees, mortgage product fees, or surveys. Knowing the bands before you make an offer is not optional; it is what stops a deal from unwinding the week before exchange.

The 2025/26 bands

From 1 April 2025 the standard residential SDLT thresholds reverted to their pre-2022 levels after the temporary nil-rate band of £250,000 expired. The current slice rates are:

• £0 – £125,000: 0%
• £125,001 – £250,000: 2%
• £250,001 – £925,000: 5%
• £925,001 – £1,500,000: 10%
• Above £1,500,000: 12%

SDLT works on a slice basis, not a single flat rate. Each portion of the price falling in a band is taxed at that band's rate, then the slices are summed. There is no cliff edge between standard bands — buying at £250,001 instead of £250,000 costs you 5p of extra tax, not the entire 5% on the whole price. The cliff edges live elsewhere, in the first-time buyer cap (see below) and in the £40,000 de-minimis for the additional-property surcharge.

Worked example: a £350,000 standard purchase

Take a buyer replacing their only or main residence at £350,000. The slice calculation is:

• £0 – £125,000: £125,000 at 0% = £0
• £125,001 – £250,000: £125,000 at 2% = £2,500
• £250,001 – £350,000: £100,000 at 5% = £5,000
• Total SDLT: £7,500

Effective rate: £7,500 / £350,000 ≈ 2.1%. A first-time buyer paying the same £350,000 would pay only £2,500 — they get 0% on the first £300,000 and 5% on the £50,000 above. An additional-property buyer at the same price pays £7,500 standard plus a 5% surcharge on the entire £350,000 (£17,500), for a total of £25,000 — an effective rate of 7.1%, more than three times the standard buyer's bill. The stamp duty calculator shows the band split for any price and any of the three buyer types in one go, including the FTB cliff at £500,000.

First-time buyer relief and the £500,000 cliff

First-time buyer relief gives FTBs a higher nil-rate band and a reduced 5% rate on the next slice:

• £0 – £300,000: 0%
• £300,001 – £500,000: 5%
• Above £500,000: FTB relief is lost entirely

Two facts surprise buyers. First, the eligibility test is strict: neither you nor anyone you are buying with may have ever owned a residential property anywhere in the world — including inherited shares, property held jointly with parents, or interests in property abroad. One of you having previously owned a flat in 2014 disqualifies the whole purchase. Second, the relief disappears at £500,001. Buy at £500,000 and pay £10,000 of SDLT (5% of the £200,000 above £300,000). Buy at £505,000 and the relief vanishes — the full standard bands apply, producing £15,250. A £5,000 increase in price triggers a £5,250 increase in tax.

The cliff is engineered into the regime; HMRC means it. The planning implication is straightforward: if you are an FTB and your offer is creeping above £500,000, work out whether the extra is worth more than £5,250 to you. It often isn't, and walking the price back to £500,000 with a chattels split or a renegotiation is cleaner than crossing the line.

The additional property surcharge

Buy a property that is not replacing your only or main residence and you pay an additional 5% on top of the standard bands, on the entire purchase price. This catches second homes, holiday homes, and most buy-to-let purchases. The surcharge was raised from 3% to 5% by the Autumn 2024 Budget, effective for completions on or after 31 October 2024.

A 5% surcharge across the whole price is meaningfully larger than the standard tax for typical UK property values. On a £400,000 BTL the standard SDLT is £10,000; the surcharge adds £20,000; total £30,000 — a 7.5% effective rate. This is one of the structural reasons amateur landlord economics have weakened over the past decade. The buy-to-let mortgage calculator models the wider cashflow picture, and the SDLT bill should be a line item in any rental yield analysis.

The surcharge has a £40,000 de-minimis: properties bought for less than £40,000 are not chargeable. Anything from £40,000 upwards is chargeable on the full price, not just the slice above £40,000. There is no graduated phase-in here — it really is a hard threshold.

If you buy a new main residence before selling your old one, the 5% surcharge is payable on completion of the new home but is refundable if you sell the old one within 36 months. You apply for the refund through the HMRC SDLT refund service. The cashflow timing matters — banks expect bridging or conventional finance to cover the surcharge until the refund clears. The mortgage affordability calculator is the right place to model whether you can carry both mortgages while the refund is pending.

Linked transactions, mixed use, and edge cases

SDLT has several edge-case rules that move calculations away from the single-property base case. The biggest are:

Linked transactions. If you buy two or more properties from the same seller in connected deals, HMRC treats them as a single transaction for SDLT — the prices are combined and bands applied to the total. This stops buyers from artificially splitting one purchase into two to use the nil-rate band twice. Genuine separate purchases from unrelated sellers are not linked.

Mixed-use property. If the property has both residential and non-residential elements (a flat above a shop, a farmhouse with significant agricultural land), it can qualify for the non-residential SDLT rates, which top out at 5% rather than 12%. HMRC has tightened the test in recent years and routinely challenges marginal mixed-use claims; this is not a planning lever to attempt without specialist advice.

Multiple Dwellings Relief (MDR) abolished. MDR, which let buyers of multiple dwellings in a single transaction calculate SDLT on the average price per dwelling, was abolished from 1 June 2024. Transactions completing after that date no longer benefit. If you see older guides recommending MDR, treat them with caution — the relief is no longer available.

Annexes and granny flats. A property with a separate self-contained dwelling (annex worth at least one third of the total price) used to attract MDR and could in some cases avoid the surcharge. Post-MDR-abolition the surcharge analysis still matters, but the average-price relief is gone.

Non-resident surcharge. Non-UK residents pay a further 2% surcharge on top of standard rates and any additional-property surcharge. Residency for this test is broadly the 183-day rule applied at the date of completion. An expat returning to the UK can plan around this — buying after spending enough time back in the UK to satisfy the residency test removes the 2%.

How to reduce your SDLT bill — legitimately

Time the purchase around your residence status

If you are downsizing or moving home, completing on the sale of your current residence before — or on the same day as — the new purchase avoids the 5% surcharge entirely, rather than paying it and waiting for a refund. Conveyancers can chain transactions to land the same day; insist on it where possible. The same point applies to expats: timing UK residency before completion matters.

Apportion chattels properly

Furniture, free-standing white goods, curtains, and other movable items are not part of the property for SDLT. Where the seller leaves chattels behind, the price paid for them should be itemised separately and excluded from the SDLT calculation. The figures must be honest market values — HMRC will challenge inflated chattels valuations. A genuine £5,000 split on a £505,000 purchase keeps you under the FTB cliff and is perfectly legitimate; a £50,000 split on the same purchase is tax evasion.

Buy below band thresholds where you can

Because of the FTB £500,000 cliff and the additional-property £40,000 de-minimis, small price moves in those zones produce disproportionate tax outcomes. £500,000 is fundamentally cheaper than £505,000 for an FTB; £39,000 is fundamentally cheaper than £41,000 for an additional-property buyer. Negotiation works.

Use the spousal "main residence" rules

Married couples and civil partners are treated as a single unit for the additional-property test. You cannot avoid the surcharge by putting the second property in only one spouse's name. Conversely, if one spouse already owns a property and the other does not, buying a new main residence in joint names will not lose FTB relief in the couple's favour either — both must qualify. Plan ownership structures before exchange, not after.

Consider the SDLT refund window for property chains

Pay the surcharge, complete the new purchase, then sell the old home within 36 months and reclaim. The refund is the surcharge amount only — standard SDLT remains due. Apply via the HMRC SDLT refund service within 12 months of the sale of the previous main residence or 12 months of filing the original SDLT return, whichever is later.

Common mistakes

Assuming the temporary nil-rate band still applies

The £250,000 nil-rate band was in force from September 2022 to 31 March 2025. Every guide written in that window quotes £250,000 as the starting threshold; many have not been updated. The current threshold is £125,000. Sub-£250,000 standard purchases that paid zero SDLT in March 2025 now pay up to £2,500. If you are using a calculator, check it has been updated for the post-April-2025 regime.

Forgetting that "first-time buyer" is global

FTB status is lost by ever having owned a residential propertyanywhere in the world. Inherited a quarter-share of a flat from a grandparent? Not an FTB. Owned a holiday home in Spain in your twenties? Not an FTB. Joint purchasers must all qualify. The penalty for falsely claiming relief is repayment plus interest plus a deliberate-error penalty; conveyancers ask the question for a reason.

Underestimating the surcharge on a buy-to-let

Models built before October 2024 used a 3% surcharge. The current figure is 5%. On a typical £250,000 BTL the cashflow difference between a 3% and 5% surcharge is £5,000 — enough to flip a marginal deal. Update spreadsheets that have not been touched since the Autumn 2024 Budget.

Filing late because the solicitor "is handling it"

The 14-day deadline runs from the effective date — usually completion. Most solicitors meet it, but the legal duty is the buyer's. If anything stalls (a lender query, a missing form), the buyer gets the £100 penalty, not the firm. Confirm the SDLT return has been filed in writing within the fortnight after completion.

When to seek professional advice

For a single residential purchase from an unrelated seller, the SDLT calculation is mechanical. The stamp duty calculator handles standard, first-time buyer, and additional-property purchases for England and Northern Ireland to within a pound of the HMRC figure.

Get specialist tax advice — a chartered accountant (ICAEW or ACCA), a Chartered Tax Adviser (CTA), or a specialist stamp duty lawyer — before exchange when any of the following apply: linked or chained transactions involving the same seller, a possible mixed-use claim, properties with self-contained annexes, transfers between connected parties, transfers into or out of corporate or trust ownership, partnership transactions, or non-resident buyer status.

SDLT is the kind of tax where reorganising ownership a week before exchange is much cheaper than reorganising it a year after completion. If your structure is not simple, get the advice early. Once the transaction is filed, undoing it is rarely costless.

Frequently asked questions

See the FAQ section on the stamp duty calculator page for direct answers to the most common questions about the 2025/26 bands, first-time buyer relief, the additional-property surcharge, payment deadlines, and the differences between SDLT, LBTT, and LTT across the UK.