SDLT Buy-to-Let Calculator
Stamp Duty Land Tax (SDLT) is a significant upfront cost for property buyers in England and Northern Ireland. For landlords buying an additional residential property, a 3% surcharge applies on top of the standard SDLT rates. This calculator computes the exact SDLT liability using 2024/25 rates for both standard purchases and additional properties — a critical number for any purchase appraisal.
Why this matters
On a £300,000 buy-to-let, the additional 3% surcharge adds £9,000 to the SDLT bill compared to a first-home purchase. Failing to budget for this can derail a transaction or severely impact returns.
Key points
- The 3% SDLT surcharge applies to all additional residential properties (second homes, buy-to-let)
- SDLT is calculated on a tiered basis — each band applies only to the portion of the price in that range
- 2024/25 standard SDLT rates: 0% up to £250,000, 5% £250,001–£925,000, 10% £925,001–£1.5m, 12% above £1.5m
- With the surcharge, rates become: 3%, 8%, 13%, 15% respectively
- Scotland (LBTT) and Wales (LTT) have different rates and thresholds
- SDLT is paid within 14 days of completion
Frequently asked questions
What is the 3% SDLT surcharge for buy-to-let?
Since April 2016, buyers purchasing an additional residential property (including buy-to-let) pay a 3% SDLT surcharge on top of the standard rates. This applies to the full purchase price. The surcharge is payable on properties worth more than £40,000.
Do I pay the 3% surcharge if I only own one other property?
Yes — the 3% surcharge applies as soon as you own more than one residential property on the day of purchase. Even a property inherited or received as a gift counts.
Is there any SDLT relief for buy-to-let investors?
There is no specific relief for buy-to-let investors. However, Multiple Dwellings Relief (MDR) applies when purchasing two or more dwellings in a single transaction — this can significantly reduce SDLT on HMOs and blocks of flats.
How is SDLT different in Scotland and Wales?
Scotland uses Land and Buildings Transaction Tax (LBTT) and Wales uses Land Transaction Tax (LTT). Both have different rates and thresholds from English SDLT but also charge surcharges on additional properties. This calculator covers England and Northern Ireland only.