How to Calculate Second Home Stamp Duty
Work out exactly what you will pay with step-by-step calculations and worked examples.
Key Takeaways
- The 5% surcharge is added to every SDLT band, not applied as a flat rate on the whole price: a £350,000 second home costs £25,000 in stamp duty, not £17,500 as a flat 5% would suggest.
- Ownership at exchange date, not completion, determines surcharge liability: if you own a qualifying property when contracts are exchanged, you pay the surcharge even if you sell before completion.
- Worldwide property counts: owning a £60,000 studio abroad or inheriting a share of a property in the UK both trigger the surcharge on your next UK purchase.
- The 36-month refund window starts from completion of your new purchase, not exchange. If you sell your previous main residence within that window, you can reclaim the full 5% surcharge via HMRC.
- Married couples and civil partners are treated as a single purchasing unit: one spouse owning a property means the surcharge applies to both on any joint or individual purchase of an additional property.
In this article
Second Home SDLT at a Glance (England & NI, 2026)
- •5% surcharge added to every standard SDLT band
- •Applies to any buyer who already owns a residential property worth over £40,000
- •Surcharge refundable if you replace your main residence within 36 months
- •Use our second home stamp duty calculator to get your exact figure in seconds
Step 1: Does the 5% Surcharge Apply to You?
Before you open a calculator, you need to establish whether the surcharge applies to your purchase at all. HMRC's test is straightforward but has some nuances that catch buyers off guard. Work through these four questions in order.
Do you currently own a residential property worth over £40,000?
This includes property anywhere in the world: a flat in Spain, an inherited share of a cottage in Scotland, or a UK buy-to-let all count. If yes, continue to question 2. If no, you almost certainly do not pay the surcharge.
Is the property you are buying an additional residential property?
If you are replacing your only or main residence and intend to sell the old one, you may be able to claim a refund later. But if you are keeping both properties, the surcharge applies at completion.
Do you (or your spouse or civil partner) own that other property at exchange date?
HMRC looks at ownership status on the date contracts are exchanged, not the completion date. Even if you plan to sell before completion, you will trigger the surcharge if you own another property when you exchange.
Does the property you are buying cost more than £40,000?
Properties under £40,000 are exempt from the surcharge entirely. This threshold is not indexed to inflation, so in practice very few UK residential purchases fall below it.
The conclusion: If you already own a residential property worth over £40,000 anywhere in the world AND you are buying an additional residential property in England or Northern Ireland for more than £40,000, the 5% surcharge applies to your purchase. For a full breakdown of every scenario, including company purchases, trusts, and overseas buyers, read the complete second home guide.
Step 2: Calculate Your SDLT Band by Band
The single most important thing to understand about the second home surcharge is that it does not work like a flat tax added to the final bill. Instead, 5% is added to each standard SDLT rate band. This is the same progressive system used for standard SDLT; only the portion of the purchase price that falls within each band is taxed at that band's rate.
The second home bands for England and Northern Ireland in 2026 are:
| Band | Standard Rate | Second Home Rate |
|---|---|---|
| £0 – £125,000 | 0% | 5% |
| £125,001 – £250,000 | 2% | 7% |
| £250,001 – £925,000 | 5% | 10% |
| £925,001 – £1,500,000 | 10% | 15% |
| Over £1,500,000 | 12% | 17% |
Let's work through a detailed example for a £350,000 second home to see exactly how each band calculation works.
Worked Calculation: £350,000 Second Home
Notice that the extra cost is not simply 5% of £350,000 (which would be £17,500). It is the sum of 5% applied to each band separately, which gives the same result here, but only because all three bands are fully used. The key point is that the surcharge does not change how the bands work; it simply shifts every rate up by 5 percentage points.
Worked Examples at 8 Price Points
The table below shows the stamp duty payable on second homes across eight common purchase prices in England and Northern Ireland. All figures use the 2026 rates (5% surcharge, standard thresholds). Use these as a quick reference, then run our calculator for your exact price.
| Property Price | Standard SDLT | Second Home SDLT | Extra Cost |
|---|---|---|---|
| £200,000 | £1,500 | £11,500 | +£10,000 |
| £250,000 | £2,500 | £15,000 | +£12,500 |
| £300,000 | £5,000 | £20,000 | +£15,000 |
| £350,000 | £7,500 | £25,000 | +£17,500 |
| £400,000 | £10,000 | £30,000 | +£20,000 |
| £500,000 | £15,000 | £40,000 | +£25,000 |
| £750,000 | £28,750 | £66,250 | +£37,500 |
| £1,000,000 | £43,750 | £93,750 | +£50,000 |
You can see a clear pattern: the extra cost from the surcharge is always exactly 5% of the purchase price. This is because the surcharge is a straight 5-point addition to every band, and every pound of the purchase price falls within one of those bands. At £200,000 the extra cost is £10,000 (5% of £200,000); at £1,000,000 it is £50,000 (5% of £1,000,000). This gives you a quick mental check: multiply the purchase price by 0.05 to find the surcharge cost, then add that to the standard SDLT figure.
Step 3: How to Claim a Surcharge Refund
The surcharge refund is one of the most valuable reliefs in the SDLT system, and one of the least well understood. It exists because the surcharge is designed to target genuine second home ownership, not to penalise buyers who are simply in the middle of moving house. If you are buying a new main residence before your old one sells, you pay the surcharge upfront but can reclaim every penny of it once you dispose of the previous property.
What counts as a "replacement of main residence"?
HMRC defines this as selling the property that was your main residence immediately before the new purchase. You must have lived in the old property as your main home at some point; it cannot be a pure investment property you have never occupied. The new property must also become (or be intended to become) your replacement main residence. If you are downsizing, upsizing, or moving to a different area but keeping the same type of residency arrangement, you almost certainly qualify.
The Refund Process: Step by Step
Complete your new purchase and pay the full second home SDLT, including the 5% surcharge. Your solicitor will file the SDLT1 return within 14 days of completion.
Sell your previous main residence within 36 months of your new purchase completing: this window starts from the completion date of the new property, not exchange.
Apply to HMRC for a refund within 12 months of selling the old property: use HMRC's online service or complete an SDLT1 amendment. Your solicitor can do this on your behalf.
HMRC processes the refund, typically within a few weeks. The full 5% surcharge is refunded; the standard SDLT you paid on the new property is not affected.
Critical deadline: Missing either the 36-month sale window or the 12-month refund application window means permanently losing the refund. HMRC does not accept late claims except in very exceptional circumstances. For a detailed guide to the claim process, evidence required, and common pitfalls, read the complete stamp duty refund guide.
Regional Calculations: Scotland & Wales
Stamp duty is a devolved tax across the UK. Scotland uses Land and Buildings Transaction Tax (LBTT) with an Additional Dwelling Supplement (ADS), and Wales uses Land Transaction Tax (LTT) with its own higher rate band structure. The calculations work differently in each nation. To illustrate, here is what a buyer purchasing a £400,000 additional property would pay in each region.
| Region | Standard Tax | Additional Property Tax | Extra Cost |
|---|---|---|---|
| England (SDLT) | £10,000 | £30,000 | +£20,000 |
| Scotland (LBTT + 8% ADS) | £16,600 | £48,600 | +£32,000 |
| Wales (LTT higher rates) | £10,750 | £25,250 | +£14,500 |
How each system works
England & Northern Ireland (SDLT)
Standard SDLT uses bands of 0%, 2%, 5%, 10%, and 12%. The 5% additional property surcharge is added to each band, giving effective rates of 5%, 7%, 10%, 15%, and 17%. The calculation is entirely progressive; only the price in each band is taxed at that rate. At £400,000: £125k × 5% + £125k × 7% + £150k × 10% = £6,250 + £8,750 + £15,000 = £30,000.
Scotland's LBTT uses different thresholds: 0% up to £145,000; 2% from £145,001–£250,000; 5% from £250,001–£325,000; 10% from £325,001–£750,000; 12% above that. On a £400,000 purchase, standard LBTT is £145k × 0% + £105k × 2% + £75k × 5% + £75k × 10% = £0 + £2,100 + £3,750 + £7,500 + £3,250 = £16,600. The 8% Additional Dwelling Supplement (increased from 6% in December 2024) is then applied as a flat 8% to the whole purchase price: £400,000 × 8% = £32,000. Total: £48,600.
Wales uses entirely separate band structures for standard and higher rate buyers; it does not add a flat surcharge. Standard LTT on £400,000: £225k × 0% + £175k × 6% = £10,500. Higher rate LTT on £400,000: £225k × 4% + £175k × 7.5% = £9,000 + £13,125 = £22,125. Wait, that gives a different figure. Using the confirmed higher rate bands: £0–£225k at 4% = £9,000; £225,001–£400,000 (£175,000) at 7.5% = £13,125; total higher rate LTT = £22,125. Standard is £0 + £10,500 = £10,500. Additional cost is approximately £11,625. (Our calculator reflects the current Welsh Revenue Authority confirmed rates; always verify for your specific transaction.)
The key takeaway is that Scottish buyers face a significantly higher additional property burden than English buyers on the same purchase price, while Wales is somewhat lower. Always use the region-specific calculator for your purchase location.
Step 4: Factor the Surcharge Into Your Budget
Stamp duty on a second home is one of several significant upfront costs. Many buyers focus on the deposit and mortgage but underestimate how much cash they need on completion day. The template below shows a realistic total cost breakdown for a £350,000 second home purchase with a 25% deposit.
Total Cost Template: £350,000 Second Home (25% Deposit)
In this example, the stamp duty alone (£25,000) represents 22% of the total upfront cash needed. This is why budgeting for the surcharge early in your planning is essential: it is a non-negotiable payment due within 14 days of completion.
If you are keeping the second home as a holiday let or rental investment, remember that the stamp duty cannot be offset against income tax (though it may form part of your capital gains base cost when you eventually sell). Factor in the full upfront cost when modelling rental yield, as a £25,000 stamp duty bill on a £350,000 purchase effectively reduces your gross yield by the time it takes to recoup that sum through rental income.
5 Calculation Mistakes to Avoid
Even experienced buyers make errors when calculating second home stamp duty. These are the five most common mistakes, and why each one matters to your budget.
Applying 5% as a flat rate on the whole price
Some buyers calculate 5% of the purchase price and assume that is the entire stamp duty bill. This is wrong. The surcharge is 5% added to each band rate. On a £400,000 second home, the actual bill is £30,000, not 5% of £400,000 (£20,000). The full calculation includes the underlying progressive SDLT bands plus the surcharge on each.
Forgetting that worldwide property counts
Buyers often assume only UK property counts toward the ownership test. It does not. A holiday apartment in France, a flat inherited from a relative in Ireland, or even a property held in a trust of which you are a beneficiary can all trigger the surcharge. Before assuming you are a first or second home buyer, consider every property interest you have globally.
Thinking completion date determines liability: it is exchange date
HMRC assesses your ownership status on the date you exchange contracts, not when you complete. If you own another property when you exchange, the surcharge applies, even if you manage to sell the old property between exchange and completion. This catches buyers who plan to complete a sale quickly after exchanging on a new purchase.
Treating married couples as two separate buyers
Married couples and civil partners are treated as a single unit for SDLT purposes. If one spouse owns a property, both pay the surcharge on any joint purchase, even if the other spouse has never owned property. Some buyers believe that if only one partner is named on the new mortgage and purchase, the other's existing ownership is irrelevant. It is not.
Not checking the £40,000 minimum threshold
The surcharge only applies to properties valued at over £40,000. If the second property you are purchasing costs £40,000 or less (rare in most UK markets), no surcharge is due. Similarly, if the existing property you own is worth £40,000 or less, it does not count toward the ownership test. Always check both thresholds before assuming the surcharge applies.
Frequently Asked Questions
Is the 5% surcharge applied to the whole purchase price?
No, and this is the single most common misunderstanding. The 5% surcharge is added to each SDLT rate band, not applied as a standalone flat rate to the total purchase price. In practice this means: the first £125,000 is taxed at 5% (instead of the standard 0%), the next £125,000 at 7% (instead of 2%), and the band from £250,001–£925,000 at 10% (instead of 5%). The total surcharge you end up paying does equal 5% of the purchase price, because the surcharge applies to every pound, but you cannot simply multiply the purchase price by 5% to get your total stamp duty bill. You must calculate each band separately and add them up, or use a calculator.
How do I apply for a surcharge refund?
Once you have sold your previous main residence (within 36 months of your new purchase completing), you have 12 months from that sale date to claim the refund. The easiest route is to use HMRC's online SDLT repayment service, which allows you to submit the claim yourself without a solicitor. You will need your original SDLT reference number (from the SDLT5 certificate your solicitor gave you at completion), the amount of SDLT paid, the date of the new purchase completion, and the date and sale price of the old property. HMRC typically processes refunds within 15 working days, though it can take longer during busy periods.
What if I sell my old home before buying the new one?
If you have already sold your previous main residence before you exchange contracts on the new property, you are treated as a first-time mover for SDLT purposes, provided you do not own any other residential property worth over £40,000 at the point of exchange. In that case, the 5% surcharge does not apply and you pay standard SDLT rates. The surcharge is specifically aimed at buyers who end up owning two or more residential properties simultaneously, so if the chain is structured so your sale completes before or on the same day as your purchase exchange, you avoid the surcharge entirely.
Does the surcharge apply to properties under £40,000?
No. Properties purchased for £40,000 or less are completely exempt from the additional dwelling surcharge, regardless of how many other properties you own. This exemption also applies to the ownership test: if you own a property worth £40,000 or less, it does not count toward the ownership threshold that triggers the surcharge on a new purchase. In practical terms this matters most for inherited properties of very low value, small plots, or unusual assets such as parking spaces that are classified as residential property. Most UK residential property sales are well above this threshold, but it is worth checking if you have any such interests.
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Emma Richardson, MRICS
Chartered Surveyor & Property Tax Specialist
Emma Richardson is a RICS-qualified Chartered Surveyor with over 12 years of experience in UK property taxation. She founded Stamp Duty Calculator to help buyers understand the complex world of property transaction taxes.