UK BTL Stamp Duty with 3% surcharge.
Total SDLT
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Standard SDLT
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3% surcharge
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Your breakdown
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Two layers of duty on a second property
Stamp Duty Land Tax on a buy-to-let or second home in England and Northern Ireland comes in two layers. First, the standard residential SDLT that everyone pays, charged in slices: nothing on the first £125,000, 2 percent from £125,001 to £250,000, 5 percent from £250,001 to £925,000, 10 percent up to £1.5 million, and 12 percent above that. Second, the additional dwellings surcharge of 3 percent on the entire purchase price, which lands on anyone buying a property while they already own another. This calculator adds both layers and shows you the total and the effective rate.
Because the surcharge applies to the whole price rather than in slices, it dominates the bill on cheaper properties. This tool is built for landlords pricing a new acquisition, parents buying a second home, and anyone who already owns one property and is buying another without selling the first.
The bill on a £250,000 buy-to-let, line by line
Take the default £250,000 purchase. The standard duty only bites on the slice above £125,000, but the 3 percent surcharge applies to every pound.
The chart makes the point that surprises most first-time landlords: on a £250,000 deal the surcharge is three times the standard duty.
Getting the surcharge refunded
The surcharge is not always permanent. If you are buying a new main home before selling your old one, you pay the 3 percent up front, but you can reclaim it if you sell your previous main residence within 36 months of the new purchase. The claim has to be made to HMRC within strict time limits, usually twelve months of the sale or of the SDLT filing deadline, whichever is later. People lose four and five figure refunds simply by missing that window, so if you are in a buy-before-sell position, diarise the reclaim the day you complete. On the £250,000 example above, the reclaimable surcharge is the full £7,500, a sum well worth chasing. For a true buy-to-let that you intend to keep alongside your home, no refund is available; the surcharge is simply a cost of the investment, and you should build it into your purchase budget from the outset rather than treating it as an afterthought at completion.
Scotland and Wales do it differently
This calculator covers England and Northern Ireland, where SDLT applies. Buy in Scotland and you pay Land and Buildings Transaction Tax with its own bands and a 6 percent Additional Dwelling Supplement, not 3 percent. Buy in Wales and you pay Land Transaction Tax, which has no nil-rate band for additional properties at all and its own higher rates. The numbers here will not match a Scottish or Welsh purchase, so use the relevant Revenue Scotland or Welsh Revenue Authority calculator for those.
Does the surcharge apply if the new property is under £40,000?
No. The 3 percent surcharge only applies where the additional property costs £40,000 or more. Below that figure the additional rate does not bite, which is why very low value purchases such as a garage or a small plot can fall outside it. The standard SDLT thresholds still apply in the normal way.
Can I avoid the surcharge by buying through a limited company?
No, and it can be worse. Companies pay the 3 percent surcharge on residential purchases from the first pound with no exemptions, and a corporate purchase of a dwelling over £500,000 can attract the flat 15 percent higher-rate charge plus the annual ATED charge. Incorporating a portfolio is often driven by income tax and Section 24 mortgage interest relief rather than any stamp duty saving, and the SDLT cost of moving existing properties into a company can be substantial.