Stamp Duty on a Second Home UK 2025: The 5% Surcharge Explained

Buying a second property in the UK costs more in stamp duty than buying your first. The additional dwelling supplement, a surcharge on top of standard stamp duty land tax rates, applies whenever you complete on a residential property purchase while already owning another. For purchases completing from October 2024, this surcharge is 5% of the total purchase price, which represents a significant addition to the upfront cost of property investment or a second home purchase.

Understanding exactly how the surcharge applies, what exemptions exist, and how to calculate the total stamp duty bill is important when assessing whether an investment property stacks up financially. Our stamp duty calculator gives you an instant figure for any purchase price across England, Wales and Scotland, including the second home surcharge.

How the 5% surcharge works in 2025

The additional dwelling supplement was raised from 3% to 5% on purchases completing on or after 31 October 2024. It applies on top of standard SDLT rates to any purchase of a residential property in England and Northern Ireland where the buyer already owns one or more residential properties at the end of the day of completion. The surcharge applies to the full purchase price, not just the portion above a threshold, which makes the effective cost particularly significant on higher value properties.

For a buy-to-let or second home purchase at £300,000, the total stamp duty in 2025 is approximately £17,500, compared to around £2,500 for a first-time buyer purchasing the same property. This difference of £15,000 is entirely the surcharge, and it comes out of pocket at completion with no tax relief available to offset it, unlike mortgage interest which can be relieved at the basic rate for landlords.

When the surcharge applies and when it does not

The second home surcharge applies whenever you end the day of completion owning two or more residential properties. This includes properties owned anywhere in the world, not just in the UK. If you own a property abroad as well as buying in the UK, the surcharge applies. If you own a share in a property through inheritance or joint ownership even without intending to be a landlord, the surcharge may still apply.

The most common situation where the surcharge does not apply is when the new purchase is your main residence and you have sold your previous main residence on the same day. There is a specific exemption that allows you to avoid the surcharge when replacing your main home, even if you briefly own two properties during the conveyancing process. However, if you complete on your new home before your old one sells, you will pay the surcharge at completion and claim a refund once the old property sells, provided the sale completes within three years.

Properties worth less than £40,000 are exempt from the surcharge. Caravans, mobile homes, and houseboats are also exempt. If you purchase more than one property in a single linked transaction as part of a portfolio purchase, different rules apply and multiple dwellings relief may reduce the effective rate by allowing the SDLT calculation to be based on the average property value rather than the total.

Buying through a limited company

Purchasing investment property through a limited company rather than personally does not avoid the second home surcharge. Limited companies pay the surcharge on residential property purchases regardless of whether the company owns any other properties. In fact, the standard SDLT rates for companies are structured differently, and companies face a flat 17% rate on residential properties over £500,000 under the higher rates for additional dwellings rules, which includes the 5% surcharge within it.

Buying through a company has become more popular among landlords because mortgage interest is fully deductible as a company expense, unlike the restricted tax relief for individual landlords who can only claim basic rate relief. However, the additional SDLT, higher mortgage rates for company purchases, and extraction costs for accessing profits mean the calculation is rarely straightforward. Understanding how your rental yield compares once all costs including SDLT are factored in is important before committing. Our rental yield calculator helps you work out the return on investment after accounting for purchase costs.

Scotland and Wales: different systems apply

Scotland has its own property transaction tax called Land and Buildings Transaction Tax (LBTT), administered by Revenue Scotland. The additional dwelling supplement in Scotland is 8% on top of standard LBTT rates for second home and buy-to-let purchases. This is higher than England's equivalent and makes the total transaction cost on investment property relatively more significant in Scotland.

Wales operates Land Transaction Tax (LTT) with its own additional rate for second homes, set at 5% on top of standard LTT rates from July 2024. The Welsh government has been consistently tightening taxes on second homes, particularly in areas of high demand, in response to concerns about holiday lets reducing housing availability for local residents. Some local councils in Wales are also charging up to 300% council tax on long-term empty properties and second homes, adding to the running costs of Welsh investment property.

The 36-month window for main residence replacement

When you buy a new main residence before selling your existing one, you pay the second home surcharge at completion. You can then claim a refund if you sell the old main residence within 36 months. This window was extended from 36 to 36 months following pandemic-related conveyancing delays, and it gives buyers reasonable time to sell an existing property without permanently bearing the surcharge cost.

To claim the refund you need to apply to HMRC within 12 months of selling the old property, or within 12 months of filing the SDLT return for the new property, whichever is later. The application is made online through the HMRC portal. Forgetting to claim is a genuine risk since the deadline can creep up during a busy post-move period, so setting a calendar reminder when you complete is worthwhile.

Capital gains tax and the full property investment picture

Stamp duty is just the first of several tax considerations for property investors and second home owners. When you eventually sell, capital gains tax applies to the profit if the property is not your main residence. The CGT rate on residential property for higher rate taxpayers is 24% from April 2024, with a reduced rate of 18% for basic rate taxpayers on gains that fall within the basic rate band. Annual CGT allowances have been dramatically reduced, making the tax impact of property sales more significant than it was a few years ago.

Our capital gains tax calculator lets you estimate the CGT liability when selling a residential property, which together with the stamp duty cost on purchase gives you a clearer picture of the total tax cost of property investment over a holding period. If you are considering investing in European property instead of or alongside UK property, our European rental yield tool shows how returns compare across different markets.