🇬🇧 2025/26 UK Stamp Duty Calculator: SDLT, LBTT, LTT & Surcharges

Britain’s 6 April tax year start is a direct consequence of the 1752 calendar reform. When Britain switched from the Julian to the Gregorian calendar, 11 days were “lost” overnight. The Treasury refused to give up 11 days of revenue — so instead of the traditional 25 March (Lady Day, the legal new year), the tax year simply shifted forward 11 days to 5 April — then bumped to 6 April in 1800 due to a leap year discrepancy. This same calendar quirk explains why stamp duty was historically due on “the day of conveyance” — which was always recorded by the old calendar date in legal documents until the late 18th century.

Before December 2014, SDLT was calculated as a flat percentage on the entire purchase price the moment you crossed a threshold. This created brutal “cliff edges” — buying at £250,001 cost £7,500 in SDLT (3% of the full price), while buying at £249,999 cost just £2,500 (1% of full price). That single extra £2 in purchase price triggered an extra £5,000 in tax overnight. Estate agents routinely advertised properties at £249,999, £499,999, and £999,999 — manipulating the market entirely around these thresholds. Chancellor Osborne’s 2014 reform replaced it with the progressive band system used today, eliminating every cliff edge and saving 98% of buyers money.

The SDLT holiday (8 July 2020 – 30 September 2021) raised the nil-rate threshold to £500,000, saving buyers up to £15,000. Its market impact was extraordinary: 1.5 million transactions completed in 2020/21 — the highest since the pre-financial crisis peak of 2007. Average UK house prices rose 10.4% during the holiday period as buyers rushed to beat the deadline. Critics argued the holiday simply inflated prices by the amount of the saving, with sellers capturing the benefit rather than buyers. A Nationwide report found that in London, the average saving was fully offset by price inflation within 4 months of the holiday announcement.

Standard buyer, England 2025/26:

• £0 – £125,000 × 0% = £0
• £125,001 – £250,000 × 2% = £125,000 × 2% = £2,500
• £250,001 – £480,000 × 5% = £230,000 × 5% = £11,500
• Total SDLT: £14,000
• Effective rate: 2.92% of £480,000

As a first-time buyer (FTB relief): 0% on £0–£300,000 + 5% on £300,001–£480,000 = £180,000 × 5% = £9,000. FTB saving: £5,000.

As BTL/additional dwelling: add 5% on full £480,000 = +£24,000 → total £38,000.

The effective rate is total SDLT ÷ total purchase price — the average rate you paid across the whole transaction. On a £480,000 purchase with £14,000 SDLT, the effective rate is 2.92%. The marginal rate is the rate applied to the next £1 of purchase price — at £480,000, any increase in price enters the 5% band, so the marginal rate is 5%. Understanding both matters: the effective rate tells you what you actually paid, the marginal rate tells you how much more expensive a higher-priced property will be per additional £1.

Fixtures and fittings that are not part of the land or building are excluded from the chargeable consideration for SDLT. This includes: carpets, curtains, freestanding appliances (washing machine, fridge), garden furniture, and light fittings that can be removed without damaging the fabric of the building. The excluded amount must be: (1) genuinely agreed at arm’s length between buyer and seller, (2) supported by a completed TA10 fixtures and fittings form, (3) realistic market value — not inflated. HMRC can and does challenge overinflated F&F allocations, particularly on higher-value properties where the saving is in a higher rate band.

Two or more property transactions between the same buyer and seller (or connected persons) completed simultaneously or as part of the same arrangement are “linked” under SDLT rules. The total consideration across all linked transactions is aggregated — SDLT is calculated on the combined total and then apportioned proportionally between each property. This prevents artificial price splitting — buying a house at £120,000 and an adjoining land plot for £10,000 from the same seller in the same transaction would be calculated as SDLT on £130,000, not two separate £0 transactions.

No. FTB relief requires that you have “never owned a dwelling or an interest in a dwelling” — this explicitly includes inherited interests. Whether you own 100% or a 1% share by inheritance, gift, or purchase, you are not a first-time buyer for SDLT purposes. The only exception is the “minor interest” rule — HMRC may treat a very small inherited share (typically under £40,000 in value at the time) as not disqualifying, though this is not codified in statute and each case is assessed individually. Confirm your position with your conveyancer before assuming FTB status.

No. SDLT rules are clear: all buyers in a joint purchase must qualify as first-time buyers for FTB relief to apply. Even if you are purchasing equal shares, the relief fails entirely — not just for your partner’s half. There is no “half relief” or proportional reduction available. If your partner previously owned a property (even decades ago, even abroad), standard rates apply to the full transaction. The additional dwelling surcharge may also apply if your partner’s previous property is still owned.

If any one buyer in a joint purchase is a non-UK resident (fewer than 183 UK days in the prior 12 months), the 2% non-resident surcharge applies to the entire purchase price — not just that buyer’s share. The only exception is a married couple (or civil partners) where one is UK-resident and purchasing a main residence together — in this case the surcharge does not apply. Unmarried joint purchasers have no equivalent exemption — even if the non-resident partner holds only a 1% interest in the property.

Property transfers between spouses and civil partners as part of a financial settlement in divorce proceedings are generally exempt from SDLT — provided they are made pursuant to a court order, or a formal written separation agreement, and the couple is in the process of obtaining a divorce or judicial separation. However, if the transfer involves the other spouse assuming responsibility for a mortgage or other debt, SDLT is charged on the debt assumed (not the property value). Always use a specialist family law solicitor for divorce property transfers to ensure the SDLT exemption is correctly documented and claimed.

The 15% flat rate applies to a corporate body (limited company, partnership, or collective investment scheme) purchasing a single dwelling worth over £500,000 for residential use. It does not apply to: commercial property, mixed-use property, or property purchased by a qualifying property rental business. To avoid the 15% rate legitimately, the company must claim one of the ATED relief grounds — most commonly the “property rental business” relief, where the company genuinely lets the property to unconnected third parties. The relief must be claimed on the SDLT return — it is not automatic. Seek specialist advice before any corporate residential purchase above £500,000.

The Annual Tax on Enveloped Dwellings (ATED) is an annual charge on companies, partnerships, and collective investment schemes that own UK residential property worth over £500,000. The charge for 2025/26 ranges from £4,400 (£500k–£1m) to £281,000 (over £20m). ATED returns must be filed by 30 April each year (for properties already owned) or within 30 days of purchase/crossing the value threshold. Reliefs are available for genuine property rental businesses, property developers, and property traders — but must be claimed annually on a relief return. Failure to file even when relief applies can result in penalties.

For commercial and mixed-use property, companies are often neutral or beneficial — no additional dwelling surcharge, no 15% flat rate, no ATED. For large residential portfolios of 6+ properties, the corporation tax treatment of mortgage interest (fully deductible at 25% vs Section 24 restriction for individuals) can outweigh the SDLT premium over a 15-year holding period. The business case is strongest where: (1) you are a higher/additional rate taxpayer, (2) you have a large mortgage relative to value, (3) you plan to hold for 15+ years, and (4) the portfolio will be inherited (company shares are easier to pass than individual properties). Always model the full tax comparison — income tax, CGT, IHT, SDLT, and ATED — with a specialist tax adviser before deciding.

A statutory lease extension under the Leasehold Reform Housing and Urban Development Act 1993 (adding 90 years to a flat’s lease) is subject to SDLT if a premium is paid for the extension. The SDLT is calculated on the premium at standard residential rates. If the annual ground rent is also varied (typically reduced to a peppercorn), the change in ground rent rent is also subject to the NPV calculation — though a peppercorn rent has an NPV of £0. Informal lease extensions (outside the statutory process) are treated identically for SDLT purposes. Lease renewals on commercial property follow the non-residential rules including NPV of rent.

The Leasehold Reform (Ground Rent) Act 2022 banned landlords from charging a ground rent above a “peppercorn” (effectively zero) on new residential leases granted from 30 June 2022. This has dramatically simplified SDLT on new leasehold purchases — a peppercorn ground rent produces an NPV of £0, so no SDLT is due on the rent element. However, millions of pre-2022 leasehold properties remain on the market with historic ground rents of £200–£1,000/year or more, some with doubling clauses. For these properties, the NPV SDLT calculation remains critical. Always check whether the ground rent on any leasehold purchase you are considering is peppercorn (post-2022 lease) or a legacy ground rent (pre-2022 lease).

A shorter lease term produces a lower NPV for the same annual ground rent, because there are fewer future years of rent to discount. On a £500/year ground rent, the NPV over 125 years is approximately £13,700 vs only ~£12,000 over 80 years — a modest difference for most ground rents. However, an 80-year lease also means: (1) you will likely need to extend the lease within 5 years (sub-80 years is unmortgageable for most lenders), (2) marriage value kicks in below 80 years making lease extension significantly more expensive. The SDLT impact is secondary to the far greater cost of a near-expiry lease extension premium — which itself triggers additional SDLT on the extension premium.

Yes. You have 12 months from the date of the original SDLT return to amend it and reclaim any overpaid tax. After 12 months, you can still apply for a refund under HMRC’s overpayment relief, but only if you act within 4 years of the filing date — and only for genuine errors, not for a change in tax planning strategy. To amend: log in to HMRC Online and file an amended SDLT return. Alternatively your conveyancer can file an amendment. HMRC typically processes SDLT refunds within 15 working days. Additional dwelling surcharge refunds after selling the old property follow a separate 12-month reclaim window from the date of the sale — not the original purchase.

Sub-sale relief prevents double SDLT where a buyer contracts to purchase and immediately transfers their interest to a third party before completion. The original buyer (sub-seller) pays no SDLT — only the final buyer pays, on the final consideration. Legitimate uses include: property development transactions where a developer contracts to buy and assigns to a connected SPV; house-builder pre-sales; and large-portfolio acquisitions restructured mid-transaction. HMRC has significantly tightened anti-avoidance rules around sub-sale relief — it is not available where the sub-sale is part of a tax avoidance arrangement. Always use a specialist property tax solicitor for any transaction involving a sub-sale.

As of April 2026, no confirmed SDLT rate changes have been announced beyond the April 2025 nil-rate reversion that already took effect. The current government’s fiscal position makes threshold increases unlikely before 2027/28. Possible reforms discussed in OBR and Treasury consultations include: (1) an annual property value tax to replace transaction taxes — modelled on Norway’s system; (2) a phased increase in the additional dwelling surcharge to further deter buy-to-let activity; (3) reform of the corporate 15% flat rate with more nuanced banding for genuine rental businesses. The most likely near-term change is an inflation-linked uprating of FTB thresholds — the £300,000 threshold buys a below-average property in most of England, eroding the relief’s effectiveness year by year. Always check the current HMRC rates before completing any transaction.