Second Home Stamp Duty Calculator — The Honest 2026/27 Numbers

If you already own a residential property anywhere in the world and buy an additional one costing £40,000 or more, England and Northern Ireland add a 5% surcharge on top of standard Stamp Duty Land Tax (SDLT) rates. This applies whether the new property is a buy-to-let, a holiday home, or a home purchased for a family member.

Running your numbers through a proper second home stamp duty calculator before making an offer matters because this single tax charge is genuinely one of the largest upfront costs most second-home and buy-to-let buyers ever encounter — often exceeding the deposit itself on a lower-value property. Getting an accurate figure ahead of exchanging contracts, rather than discovering the real number from a solicitor's completion statement, gives genuinely more room to budget properly or renegotiate if the numbers don't work.

It's worth being clear about who this actually catches. The surcharge applies regardless of whether the additional property is bought outright, with a mortgage, or through a limited company, and regardless of whether the existing property you already own is in the UK or anywhere else in the world. Even someone who has never owned UK property before, but owns a home abroad, faces the surcharge on their first UK residential purchase if it isn't their intended main residence.

A genuinely common mistake among second-home and buy-to-let buyers is estimating the tax bill using an outdated rate, a rough mental shortcut, or a figure remembered from a previous purchase years earlier. Given the surcharge rose by a full 2 percentage points in October 2024, anyone relying on an older estimate could be working from a figure that's now meaningfully wrong — on a £400,000 purchase, that 2 percentage point difference alone is £8,000.

This matters most at the point of making an offer, when the buyer needs to know their true total cost of acquisition to judge whether a purchase price is genuinely affordable and whether the expected rental yield or personal use still justifies the investment. A second home stamp duty calculator that reflects the current 5% rate, rather than an outdated figure, is the difference between a genuinely informed offer and an unpleasant surprise at completion.

The 5% surcharge is added on top of every band above, applied to the whole purchase price rather than just the portion within each band.

These standard bands apply identically whether you're buying your only property or an additional one — the surcharge is a separate calculation layered on top, not a replacement for the standard band structure. Understanding both pieces separately, as this calculator shows, makes it much easier to see exactly where your money is going: the "ordinary" tax any buyer would pay at that price, and the additional cost specifically tied to already owning another property.

A genuinely important detail: the surcharge applies to the entire purchase price from the first pound, once the property costs £40,000 or more — not just the portion above a threshold, unlike how standard SDLT bands work. This is precisely why second home stamp duty bills look disproportionately larger than standard bills at the same price point, and why buyers relying on old, pre-October-2024 estimates can be caught out by a bill thousands of pounds higher than expected.

This "whole price" mechanic is a genuinely different structure from standard SDLT, where each band only taxes the portion of the price that falls within it. Understanding the distinction matters when comparing a second home purchase against buying with someone who has no existing property — the gap between the two isn't simply "5% more," it's 5% of the entire price on top of an already-calculated standard bill, which compounds into a genuinely large absolute figure as the purchase price rises.

This mechanism exists specifically for people whose timing doesn't line up neatly — buying a new main home before completing the sale of the old one, often to avoid a stressful chain break or a rushed move. The surcharge is charged upfront precisely because, at the moment of the new purchase, HMRC has no way of knowing whether the old property will genuinely sell within the 3-year window. Once it does, the reclaim restores the buyer to the position of a standard, single-property purchaser, but only if the paperwork is filed correctly and within the 12-month deadline — missing this window means the surcharge becomes permanent even if the old home has genuinely sold.

Scotland's Additional Dwelling Supplement (ADS) rose from 6% to 8% in December 2024, and uses entirely separate LBTT bands with a lower £145,000 nil-rate threshold. Wales uses Land Transaction Tax (LTT) with its own distinct band structure. This calculator uses England and Northern Ireland figures only.

Scotland's 8% ADS, being the highest of the three nations, is charged as a flat percentage of the whole purchase price rather than layered into bands in quite the same way SDLT works, which can make Scottish second-home purchases genuinely the most expensive in the UK for tax purposes at a given price point. If you're comparing a second property across UK nations, it's worth running each jurisdiction's specific calculator separately rather than assuming the England figures translate directly, since both the surcharge rate and the underlying standard bands differ meaningfully.

No. The same 5% surcharge applies to purchases made through a limited company. Corporate purchases above £500,000 face a flat 17% rate instead of the standard bands, often making company purchases genuinely more expensive at the point of purchase. Limited company structures can still reduce overall tax through how rental profits are taxed, but they don't avoid the stamp duty surcharge itself — this needs modelling against your expected hold period and rental yield, not assumed as an automatic saving.

The decision between buying personally or through a company genuinely depends on individual circumstances that go well beyond stamp duty alone. Higher-rate taxpayers with substantial rental income sometimes find the corporation tax treatment of profits, combined with the ability to offset mortgage interest more favourably than under personal ownership rules, outweighs the higher upfront stamp duty cost over a multi-year hold. But this is a genuinely complex area worth modelling properly with an accountant before committing, rather than assuming either structure is automatically better based on a single factor like the stamp duty bill alone.

Here's how the numbers work through a real second home stamp duty calculator scenario. A £310,000 second home purchase. Standard SDLT: 0% on the first £125,000, 2% on the next £125,000 (£2,500), 5% on the remaining £60,000 (£3,000) = £5,500. The 5% surcharge on the full £310,000: £15,500. Total bill: £21,000 — compared with £5,500 for a standard buyer, a difference of £15,500 purely from the additional-property surcharge.

Official sources & further reading: check current rates at GOV.UK, read general guidance at MoneyHelper, and confirm your exact position with a conveyancing solicitor. Check standard purchase costs with our stamp duty calculator, or model the wider investment with our buy to let mortgage calculator.