Buy to let stamp duty: rates, surcharges and how to calculate your bill

Stamp Duty Land Tax (SDLT) is a tax you pay when you buy property or land in England and Northern Ireland above a certain price. If you are purchasing a buy-to-let property, you pay the standard SDLT rates plus an additional surcharge because it counts as a second or additional residential property.

The surcharge was originally introduced at 3% in April 2016. The October 2024 Autumn Budget increased it to 5%, effective from 31 October 2024. This higher surcharge applies to every buy-to-let purchase completing on or after that date, regardless of when you exchanged contracts.

The surcharge is added to each SDLT band, not applied as a flat rate on the total price. This means the effective tax rate increases progressively as the purchase price rises. Scotland and Wales have their own equivalents: Land and Buildings Transaction Tax (LBTT) and Land Transaction Tax (LTT), each with their own additional dwelling supplements. This guide covers SDLT in England and Northern Ireland. You can find a full breakdown of buy-to-let tax obligations in our dedicated guide.

The amount of stamp duty you pay on a buy-to-let property depends on the purchase price. From 1 April 2025, the nil-rate threshold for standard purchases reverted from £250,000 to £125,000, which also affects buy-to-let purchasers. Below are the combined rates (standard SDLT plus the 5% surcharge) that apply to buy-to-let and additional property purchases.

For a £200,000 buy-to-let purchase, your stamp duty bill would be £11,500: £6,250 on the first £125,000 at 5%, plus £5,250 on the remaining £75,000 at 7%. For a £350,000 property, the total rises to £25,000. You can use a buy-to-let mortgage calculator to estimate your total upfront costs including stamp duty, deposit and arrangement fees.

The 5% surcharge applies whenever you buy a residential property and already own another one, whether in the UK or abroad. It is charged on top of the standard SDLT bands, not as a single flat percentage on the whole price. This progressive structure means you pay a different combined rate on each slice of the purchase price.

The surcharge applies in several common situations:

• Buying your first investment property while you still own your main home
• Adding to an existing portfolio of rental properties
• Purchasing through a company, including SPV structures
• Replacing a main residence if you have not sold the previous one within 36 months

If you are a first-time landlord who already owns a home, the surcharge still applies because you will own more than one residential property after completion. You also need to factor in the deposit requirements when budgeting, as buy-to-let lenders typically require at least 25% of the property value.

The 5% surcharge is mandatory on additional property purchases, so there is no legal way to avoid it entirely. However, there are legitimate strategies that may lower your overall SDLT cost:

• Purchase below £40,000: Properties bought for less than £40,000 are exempt from SDLT entirely, including the surcharge. This may apply to certain auction properties or land purchases.
• Transfer to a spouse: Transfers between married couples or civil partners are generally exempt from SDLT, though this does not help with the initial purchase.
• Claim Multiple Dwellings Relief was abolished: From 1 June 2024, Multiple Dwellings Relief (MDR) is no longer available. If you completed a qualifying purchase before that date, you may still be able to claim.
• Buy through a limited company: While companies still pay the surcharge, there can be other tax efficiencies. Read more in our guide to buying through a limited company.
• Negotiate on price: A lower purchase price directly reduces your stamp duty bill. Even a small reduction can save hundreds in SDLT.

A specialist mortgage advisor can help you structure your purchase to minimise costs. Get matched with a buy-to-let mortgage specialist who understands the full picture, from interest rates to tax obligations.

If you purchase a buy-to-let property through a Special Purpose Vehicle (SPV) or any limited company, the 5% surcharge still applies. Companies always pay the higher SDLT rates on residential property purchases because, from HMRC's perspective, a company can never have a "main residence". Every company purchase is treated as an additional dwelling.

For properties costing more than £500,000, companies face an additional consideration. A flat 17% SDLT rate applies to all residential properties bought by companies above this threshold (15% standard corporate surcharge plus 2% increase from the 2024 changes). This is separate from the banded rates that apply below £500,000.

Despite the stamp duty cost, many landlords still choose the SPV route because of other tax advantages, particularly around mortgage interest relief under Section 24. Corporation tax at 25% can be lower than higher-rate income tax at 40% or 45%. If you are considering a buy-to-let remortgage or restructuring your portfolio, speak to an advisor about whether a company structure makes sense for your circumstances.