UK SDLT Surcharges: 5% Additional Dwelling and 2% Non-Resident

If you are buying residential property in England or Northern Ireland, two SDLT surcharges for additional dwellings and non-residents can significantly increase your tax bill: a 5% surcharge on every rate band when the purchase is an additional dwelling, and a separate 2% surcharge when the buyer does not meet the UK residency test. They stack, so a non-resident buying a second home pays a 7% premium across every price bracket on top of the standard rates.

The Standard Rates the Surcharges Sit On

From 1 April 2025, a UK resident buying their only home pays SDLT on a sliced basis:

Up to £125,000: 0%
£125,001 to £250,000: 2%
£250,001 to £925,000: 5%
£925,001 to £1.5 million: 10%
Above £1.5 million: 12%

First-time buyers pay nothing on the first £300,000 and 5% on the portion from £300,001 to £500,000. Above £500,000 the relief disappears entirely.¹

The 5% Surcharge on Additional Dwellings

Since 31 October 2024, anyone buying a residential property while already owning another dwelling worth £40,000 or more anywhere in the world pays 5% on top of every band. The surcharge was previously 3%. With it applied, the bands become:

Up to £125,000: 5%
£125,001 to £250,000: 7%
£250,001 to £925,000: 10%
£925,001 to £1.5 million: 15%
Above £1.5 million: 17%

The zero-rate band vanishes. On a £300,000 buy-to-let, the surcharge alone adds £15,000 before you count the higher percentages on the upper slices.² The legislation sits in Schedule 4ZA of the Finance Act 2003.³

Spouses and Civil Partners Count as One Unit

If your spouse or civil partner owns a property, HMRC counts it against you when deciding whether the surcharge applies, even if your name is nowhere on that title. The only exceptions are couples separated by court order or deed, or living apart in circumstances likely to be permanent. Transfers between spouses who are still living together are disregarded for higher-rates purposes, but if a third party also has an interest in the property, the surcharge can still bite.⁴

The Annex Exception

A property with a self-contained annex is treated as a single dwelling if the annex sits within the same building or grounds and the main home accounts for at least two-thirds of the total purchase price. This so-called granny annex rule only works when everything is bought in one transaction. Buy the main house today and the annex under a separate contract next month, and each is assessed on its own.⁵

Replacing Your Main Home

If you buy a new home before selling the old one, you pay the 5% surcharge at completion. Sell the previous main home within three years and you can reclaim the surcharge portion. The refund request must reach HMRC by whichever is later: 12 months after the sale of the old home, or 12 months after the filing date of the SDLT return for the new one.⁶

HMRC will extend the three-year window only in genuinely exceptional circumstances. Government-imposed restrictions that physically prevent a sale may qualify. A collapsed chain, falling property values, or a buyer pulling out at the last minute do not. HMRC’s guidance treats those as ordinary risks of buying and selling.⁷

The 2% Non-Resident Surcharge

A separate 2% surcharge applies to any residential purchase where the buyer fails the UK residency test. An individual is UK-resident for SDLT purposes if they are physically present in the country for at least 183 days during any continuous 365-day period beginning 364 days before the transaction date and ending 365 days after it. Presence is counted at midnight: you have to be in the country at the end of the day for it to count.⁸

Because the window extends a year beyond completion, a buyer who is non-resident on the day of purchase can still pass the test later. Accumulate 183 UK days within the window and you can amend the SDLT return and reclaim the 2%.⁸

Companies can be classed as non-resident even when incorporated in the UK, if controlled by persons outside the country. The 2% stacks on top of every other residential rate, including the additional dwelling surcharge and the 17% corporate flat rate.⁹

Crown Servants Posted Overseas

Civil servants, military personnel, diplomats, and other Crown employees stationed abroad are treated as present in the UK for each day they spend overseas on duty. Their spouse or civil partner qualifies too, provided the couple is living together. The relief is not automatic and must be claimed on the SDLT return at Question 52.¹⁰

First-Time Buyers Still Pay the 2%

First-time buyer relief does not shield you from the non-resident surcharge. If you qualify as a first-time buyer but fail the residency test, you get the reduced first-time buyer rates and then pay 2% on top of every band, including the portion that would normally be zero-rated.⁹

When Both Surcharges Apply

A non-resident buying an investment property that is not their sole home pays both surcharges. The two combine to add 7% across every band. On a £400,000 buy-to-let bought by a non-resident:

First £125,000 at 7% (0% + 5% + 2%) = £8,750
£125,001 to £250,000 at 9% (2% + 5% + 2%) = £11,250
£250,001 to £400,000 at 12% (5% + 5% + 2%) = £18,000

Total SDLT: £38,000. A UK-resident first-time buyer purchasing the same property as a sole home would pay £5,000.²⁹

Companies Buying Above £500,000

Companies, partnerships with a corporate partner, and collective investment schemes that buy residential property above £500,000 pay a flat 17% on the whole price for transactions completing on or after 31 October 2024. That replaced the previous 15% flat rate. Companies also pay the higher additional-dwelling rates on any residential property of £40,000 or more regardless of whether they own other dwellings.¹¹²

Several reliefs bring the 17% back down to the ordinary higher rates, but each must be actively claimed. The property must qualify under one of the specified categories: a property rental business, property development or trading, public access as part of a trade such as a hotel or care home, employee accommodation, acquisition by a financial institution as part of a lending arrangement, or a farmhouse bought by a qualifying housing co-operative.¹¹

Mixed-Use Property Is Outside Both Surcharges

Neither surcharge applies to mixed-use property, such as a flat above a shop or a home attached to a medical practice. Mixed-use transactions are taxed at the non-residential rates: 0% up to £150,000, 2% from £150,001 to £250,000, and 5% above that. HMRC scrutinises mixed-use claims closely, so the commercial element has to be genuine.¹²

Where SDLT Does Not Apply

SDLT covers England and Northern Ireland only. Scotland and Wales levy their own transaction taxes under different rules, so neither the 5% additional dwelling surcharge nor the 2% non-resident surcharge described here applies to purchases there.

Filing and Payment

The SDLT return and full payment are due within 14 days of the effective date of the transaction, usually completion. Returns go in on the SDLT1 form, online or on paper, and the form requires explicit declarations about additional property ownership and residency status. Those answers determine which surcharges the system applies.¹³¹⁴

Miss the 14-day deadline and a £100 penalty applies automatically, rising after three, six, and twelve months. Interest runs on unpaid tax from day 15. As of January 2026, the late payment interest rate is 7.75%, which on a large surcharge bill compounds quickly.¹⁵

If you think a surcharge has been applied wrongly, you appeal first to HMRC and can then take the matter to the First-tier Tribunal. You can ask to defer payment of the disputed amount while the appeal is pending, though interest accrues if you lose.¹⁶

1
GOV.UK. Stamp Duty Land Tax: Residential Property Rates
2
GOV.UK. Higher Rates of Stamp Duty Land Tax
3
legislation.gov.uk. Finance Act 2003 – Schedule 4ZA
4
GOV.UK. SDLT – Higher Rates for Additional Dwellings – Individuals – Purchasing Without Your Spouse or Civil Partner
5
HM Revenue & Customs. SDLT – Higher Rates for Additional Dwellings: Meaning of Dwelling – Further Information
6
GOV.UK. Apply for a Refund of the Higher Rates of Stamp Duty Land Tax
7
HM Revenue & Customs. SDLT – Higher Rates for Additional Dwellings: Condition D
8
HM Revenue & Customs. SDLT – Increased Rates for Non-Resident Transactions: Non-Resident in Relation to a Chargeable Transaction: Individuals, Basic Rule
9
GOV.UK. Rates of Stamp Duty Land Tax for Non-UK Residents
10
HM Revenue & Customs. SDLT – Increased Rates for Non-Resident Transactions: Non-Resident in Relation to a Chargeable Transaction: Crown Employment
11
GOV.UK. Stamp Duty Land Tax: Corporate Bodies
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GOV.UK. Stamp Duty Land Tax: Rates for Non-Residential and Mixed Land and Property
13
GOV.UK. Stamp Duty Land Tax Online and Paper Returns
14
GOV.UK. Changes to the Stamp Duty Land Tax Filing and Payment Time Limits
15
GOV.UK. Rates and Allowances: HMRC Interest Rates for Late and Early Payments
16
GOV.UK. Appeal to the Tax Tribunal