Calculate SDLT on a second home or additional residential property including the 5% surcharge effective from 31 October 2024.
| Band | Taxable Amount | Rate | SDLT Due |
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The additional dwelling surcharge increased from 3% to 5% on 31 October 2024. This calculator applies the current 5% surcharge rate.
When you buy a second home, a buy-to-let property, or any additional residential property in England or Northern Ireland, you pay a surcharge on top of standard Stamp Duty Land Tax rates. From 31 October 2024, the UK government increased this surcharge from 3% to 5% — meaning buyers of second and additional homes now pay significantly more at every price point.
This free calculator shows you the exact SDLT bill on an additional property purchase, broken down band by band. It also compares your figure to the standard rate so you can see precisely how much the surcharge adds to your total transaction cost.
If you are evaluating whether to buy a second property as an investment, our rental property cash-on-cash return calculator and short-term rental Airbnb profit calculator can help you model your returns before committing to a purchase.
SDLT uses a marginal rate system, not a flat rate. Each portion of the purchase price is taxed at the rate for that band only. For second homes, 5 percentage points are added to every standard band rate. So where a standard buyer pays 0% on the first £125,000, an additional property buyer pays 5% on that same slice.
The current standard residential rates in England from April 2025 are: 0% to £125,000, 2% from £125,001 to £250,000, 5% from £250,001 to £925,000, 10% from £925,001 to £1,500,000, and 12% above £1,500,000. Add 5% to each of those bands for second homes: 5%, 7%, 10%, 15%, and 17% respectively. According to HMRC’s SDLT residential rates page, this surcharge applies to all additional dwellings regardless of purchase price.
A property purchased for £350,000 as a second home after October 2024 produces the following: first £125,000 at 5% equals £6,250. Next £125,000 at 7% equals £8,750. Remaining £100,000 at 10% equals £10,000. Total SDLT equals £25,000. The same property at standard rates would cost £7,500 in SDLT. The surcharge adds £17,500 to the bill.
This calculator is valuable for buy-to-let investors, people buying a holiday home, those purchasing for a family member, and anyone who already owns a home and is acquiring another. It is also useful for comparing the cost of purchasing in a personal name versus a limited company, though company purchases follow slightly different rules.
For landlords managing multiple purchases across a portfolio, our multi-unit property investment calculator gives a broader view of acquisition costs and expected returns across several properties at once.
An investor already owns their main home and wants to buy a £280,000 rental flat. Under post-October 2024 rules with the 5% surcharge: £125,000 at 5% equals £6,250, £125,000 at 7% equals £8,750, £30,000 at 10% equals £3,000. Total SDLT equals £18,000. Before the October 2024 increase at the old 3% surcharge, the same purchase would have cost £13,400 in SDLT — a difference of £4,600.
The 5% surcharge applies to transactions that complete on or after 31 October 2024. If you exchanged contracts before that date but completed after, the higher rate still applies in most cases. Always confirm with your solicitor which rate governs your specific transaction before finalising your budget.
If you are replacing your main residence — for example buying a new main home before selling the old one — you may initially pay the surcharge but can claim a refund if you sell your previous main residence within three years. Keep all purchase records carefully for this eventuality.
A higher upfront SDLT cost increases your effective purchase price and reduces your initial yield. Factor this into any rental yield or return on investment calculation before proceeding. A property that looks attractive at one SDLT level may deliver a lower return than expected once the true stamp duty cost is included in your numbers.
It is an additional percentage added on top of standard SDLT rates for buyers who already own a residential property and are purchasing another. From 31 October 2024, the surcharge is 5% on top of each standard rate band.
The UK government announced and implemented the increase in the Autumn Budget on 30 October 2024, with effect from the following day, 31 October 2024.
Yes. Any additional residential dwelling — including holiday homes, second residences, and properties purchased for family members — is subject to the surcharge if the buyer already owns another residential property anywhere in the world.
Corporate bodies buying residential property are subject to the higher rates for additional dwellings. Companies purchasing above £500,000 for a single residential property may also face the Annual Tax on Enveloped Dwellings as a separate obligation.
You may be exempt if you are replacing your main residence and have already sold your previous main home. Certain other exemptions exist for purchases under £40,000. Speak to a qualified conveyancer to check your specific eligibility before assuming you are exempt.
Yes, in certain circumstances. If you paid the higher rate because you had not yet sold your previous main home, and you sell it within 3 years of your new purchase, you can apply to HMRC for a refund of the surcharge portion of the tax.
No. Scotland and Wales have their own property taxes — LBTT and LTT respectively — with their own additional dwelling surcharges set at different rates. This calculator covers England and Northern Ireland SDLT only.
Full guidance is available from HMRC’s higher rates for additional dwellings page. You can also consult a solicitor or tax adviser for advice tailored to your personal situation.
The second home SDLT 5% surcharge is a significant cost for buy-to-let investors and additional property buyers in England and Northern Ireland. On a £300,000 purchase it can add over £15,000 to your upfront costs compared to a standard residential transaction.
Use this free calculator to get a clear, band-by-band figure before you exchange contracts. For additional property planning tools, see our BTL stamp duty married partner surcharge calculator and our real estate capital gains tax calculator.