Buy-to-Let Stamp Duty Surcharge UK 2026: The 3% and 5% Rules Explained

Buying an additional property in the UK -- whether a buy-to-let, a second home, or a holiday let -- triggers a higher rate of stamp duty land tax (SDLT) in England and Northern Ireland. The surcharge was increased from 3% to 5% in October 2024, making it significantly more expensive to expand a property portfolio. Here is what you need to know in 2026.

The History: From 3% to 5%

The additional property surcharge was originally introduced in April 2016 at 3% on top of the standard SDLT rates. It applied to any purchase of a residential property where the buyer already owned (or part-owned) another residential property anywhere in the world.

In the Autumn Budget of October 2024, the Chancellor raised the surcharge from 3% to 5%, effective from 31 October 2024. The change was immediate -- transactions that had already exchanged contracts but not completed before that date were caught by the new rate unless they had also exchanged on or before 31 October 2024.

Current SDLT Rates for Additional Properties (England and Northern Ireland)

SDLT on additional residential properties in 2026 applies the higher rates to the full purchase price:

Note that first-time buyer relief does not apply to additional property purchases. For a buy-to-let at GBP 300,000, the SDLT calculation runs on a slice basis: 5% on the first GBP 125,000 = GBP 6,250; 7% on the next GBP 125,000 = GBP 8,750; 10% on the remaining GBP 50,000 = GBP 5,000. Total: GBP 20,000 -- compared to just GBP 2,500 for a first-time buyer purchasing the same property.

Scotland: LBTT and the Additional Dwelling Supplement

In Scotland, Land and Buildings Transaction Tax (LBTT) applies instead of SDLT. The Additional Dwelling Supplement (ADS) is currently 8% of the total purchase price (raised from 6% to 8% in December 2024). It applies to the entire purchase price, not just the portion above a threshold, making Scottish buy-to-let purchases particularly costly on a percentage basis.

For a GBP 250,000 property in Scotland, the ADS alone is GBP 20,000.

Wales: Land Transaction Tax

In Wales, Land Transaction Tax (LTT) applies. The higher rates for additional residential properties in Wales add 4 percentage points to each LTT band rate. The standard LTT rates and the higher rate bands mean that a buy-to-let purchase in Wales carries a meaningful surcharge, though the exact figure depends on the LTT band structure current at the time of purchase. Always verify the latest Welsh Revenue Authority rates before completing.

Who the Surcharge Applies To

The surcharge applies when:

• You already own a residential property and are buying another
• You are buying jointly and either buyer already owns property
• You are a non-natural person (company) buying residential property -- companies pay the 5% surcharge from the first pound, with no standard rate bands

The surcharge does not apply to purchases of non-residential property, commercial property, or mixed-use property (which follows a different SDLT table).

Exemptions and Edge Cases

There are some situations where the surcharge may not apply or can be reclaimed:

Replacing a main residence: If you are buying a new main residence and have already sold your previous main residence (or complete the sale on the same day), the surcharge does not apply. If you buy your new home before selling the old one, you pay the surcharge but can claim a refund within 12 months of selling the old property (or 12 months of the purchase completion, whichever is later), provided the old property is sold and it was your main residence.

Inherited properties: If you inherit a property, you may find you trigger the surcharge on your next purchase even though you did not choose to own a second property. Care is needed in the period immediately after inheriting.

Low-value interests: Owning a very small share (under 50%) in a property as part of a divorce settlement or inheritance may not trigger the surcharge in some cases. HMRC guidance should be checked.

Planning Considerations

The increase to 5% has notably reduced the yield profile for new buy-to-let investors. Combined with the removal of mortgage interest relief (now a 20% tax credit only), rising void periods, and increased EPC requirements on the horizon, the cost of entry has risen sharply.

Some investors have responded by purchasing through a limited company, which offers full mortgage interest deductibility but does not avoid the surcharge. Others focus on higher-yielding properties in lower price bands to make the numbers work despite the additional upfront cost.

Always budget for the full SDLT cost including surcharge before exchange of contracts -- it is a non-refundable cash cost that must be paid within 14 days of completion.