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UK Stamp Duty Calculator

Tax

Calculate UK Stamp Duty Land Tax (SDLT) on your property purchase instantly. Covers first-time buyer relief and the additional property surcharge.

Reviewed by the thecalcu.com team · Last updated 23 July 2026

🇬🇧This tool is specific to United Kingdom
£0£5,000,000

Stamp Duty Owed

£5,000
Effective Tax Rate
1.67%
Total Cost (Price + SDLT)
£305,000

This calculator computes your Stamp Duty Owed, Effective Tax Rate, Total Cost (Price + SDLT) from the values you enter.

Inputs
Property Purchase PriceFirst-Time BuyerAdditional Property (Buy-to-Let / Second Home)
Outputs
Stamp Duty OwedEffective Tax RateTotal Cost (Price + SDLT)

What is a UK Stamp Duty?

The UK Stamp Duty Calculator works out how much Stamp Duty Land Tax (SDLT) you'll owe on a residential property purchase in England or Northern Ireland. SDLT is charged in bands rather than as a flat percentage, the first slice of the price is tax-free, and each portion above that is taxed at a progressively higher rate, up to 12% on the amount above £1.5 million. Most buyers underestimate SDLT because they mentally apply the top band rate to the whole price instead of just the slice that falls into it. If you're comparing this against your monthly costs, run the numbers alongside a mortgage-calculator so you see the full picture of what a purchase actually costs beyond the headline price. Whether you're a first-time buyer, moving home, or adding a buy-to-let to a portfolio, the rules that apply differ enough that a generic percentage estimate isn't good enough, this tool applies the right band and relief automatically based on your situation.

Who Should Use This Calculator?

First-time buyers budgeting for a purchase need to know exactly how much relief they qualify for, and that it disappears completely above £500,000 rather than just shrinking.

Home movers selling one property to buy another want an accurate SDLT figure to fold into their overall moving costs alongside solicitor and removal fees.

Landlords and buy-to-let investors comparing several potential purchases need the 5% surcharge factored in before they can compare net yields properly, a purchase that looks cheaper before tax can end up costing more after SDLT.

Second-home buyers face the same surcharge and should check this figure before making an offer.

Anyone weighing renting against buying should pair this with the take-home-pay-calculator-uk to see what's affordable month to month, plus the property-tax-calculator for recurring costs once moved in.

How to use this UK Stamp Duty calculator

  1. Enter the Property Purchase Price using the input field or the slider, the calculator updates live as you move it.
  2. Set First-Time Buyer to "Yes" if this will be your only property and you've never owned residential property before, anywhere.
  3. Set Additional Property to "Yes" if you'll own more than one residential property after this purchase (buy-to-let, second home, holiday home).
  4. Check the Stamp Duty Owed figure in the results panel, this updates instantly as you change any input.
  5. Compare the Effective Tax Rate against other price points if you're deciding between two properties.
  6. Use the Total Cost figure to check against your available funds and mortgage offer before making an offer or exchanging contracts.
Show formula & methodology ↓Show less ↑

Formula & Methodology

SDLT is calculated as the sum of tax owed in each price band the purchase price passes through:

Standard bands: 0% up to £125,000 → 2% from £125,001-£250,000 → 5% from £250,001-£925,000 → 10% from £925,001-£1,500,000 → 12% above £1,500,000.

First-time buyer bands (purchases up to £500,000 only): 0% up to £300,000 → 5% from £300,001-£500,000. Above £500,000, standard bands apply to the full price instead.

Additional property surcharge: +5% of the full purchase price, added on top of whichever band calculation applies, relief doesn't combine with the surcharge.

Worked example: a first-time buyer purchasing a £350,000 home falls above the £300,000 relief ceiling but below £500,000, so relief bands still apply, £0 tax on the first £300,000, then 5% on the remaining £50,000 = £2,500 SDLT, an effective rate of about 0.71%. The same £350,000 purchase as an additional property instead uses standard bands (£0 on the first £125,000, 2% on the next £125,000 = £2,500, 5% on the remaining £100,000 = £5,000, totalling £7,500) plus a 5% surcharge on the full price (£17,500), for a combined £25,000 SDLT, an effective rate of roughly 7.14%.

Common Mistakes to Avoid

Applying the top band rate to the whole purchase price is the error that trips up nearly everyone doing this by hand, SDLT is banded, so only the slice within each band gets that band's rate. Assuming first-time buyer relief tapers off above £500,000 is another common misread; it doesn't taper, it disappears entirely, so a £510,000 first purchase gets no relief at all and reverts to standard bands on the full price. People occasionally forget that the additional property surcharge applies to the entire purchase price, not the amount above a threshold, which makes it far more expensive than it first appears on a quick mental calculation. Leaving SDLT payment until the last minute is a practical mistake too, since it's due within 14 days of completion and your solicitor needs time to file it correctly.

Quick Reference

Scenario £350,000 purchase, SDLT owed
First-time buyer £2,500
Standard (not first home, not additional) £7,500
Additional property (buy-to-let/second home) £25,000

For the rest of your purchase costs, see the mortgage-calculator for monthly payments and the isa-calculator-uk if you're still building your deposit.

Frequently Asked Questions

What is Stamp Duty Land Tax (SDLT)?
SDLT is a tax you pay to HMRC when you buy property or land in England or Northern Ireland above a certain price. It's charged in bands, so you only pay the higher rate on the portion of the price that falls into that band, not on the whole purchase price. Scotland and Wales run their own versions (LBTT and LTT), so this calculator applies to England and Northern Ireland purchases only.
How is stamp duty calculated on a property purchase?
SDLT is worked out in slices. The first portion of the price is taxed at 0%, the next slice at 2%, then 5%, 10%, and 12% as the price climbs through each band. You add up the tax owed in each band rather than applying one flat rate to the full price, which is why the effective rate shown by this calculator is always lower than the top marginal band you fall into.
Do first-time buyers pay stamp duty?
First-time buyers get relief on properties up to £500,000: no SDLT on the first £300,000, then 5% on the portion between £300,001 and £500,000. Buy a first home above £500,000 and the relief disappears entirely, so you pay standard rates on the full price instead, it's a cliff-edge, not a taper.
What counts as an additional property for stamp duty purposes?
Broadly, any residential property you buy while you already own another one, a buy-to-let, a second home, or a holiday property. HMRC adds a 5% surcharge on top of the standard bands for these purchases, and first-time buyer relief doesn't apply even if it's technically your first purchase in your own name.
What's the difference between the standard rate and the additional property surcharge?
The standard bands apply to anyone buying a residential property they don't already own another alongside. The surcharge is an extra 5% added on top of whichever band rate applies, charged on the entire purchase price rather than just the portion above a threshold, that's why a £300,000 buy-to-let can cost thousands more in SDLT than the same property bought as your only home.
How do I use the UK Stamp Duty Calculator?
Enter the purchase price, then tell it whether you're a first-time buyer and whether the property is an additional one. The calculator updates the Stamp Duty Owed, Effective Tax Rate, and Total Cost figures instantly as you adjust the price slider, no separate 'calculate' button needed.
Can I get both first-time buyer relief and avoid the additional property surcharge?
No, the two are mutually exclusive by definition. If the property counts as an additional one, you're not buying your only residence, so first-time buyer relief doesn't apply regardless of whether you've owned property before. The calculator applies this rule automatically once you select 'Yes' for additional property.
Is stamp duty paid upfront or can it be added to a mortgage?
SDLT is due within 14 days of completion and is paid directly to HMRC, typically handled by your solicitor or conveyancer as part of completion. Some lenders will let you add it to your mortgage rather than paying it as a lump sum, though that means paying interest on it over the term of the loan.
What is the effective tax rate shown by the calculator?
It's the total SDLT owed expressed as a percentage of the purchase price, giving you one number to compare across different price points or scenarios. Because SDLT is banded, the effective rate is always lower than the top rate band your purchase price reaches, a £600,000 purchase in the 5% band won't actually cost 5% of £600,000 in tax.
Does this calculator cover Scotland or Wales?
No. Scotland charges Land and Buildings Transaction Tax and Wales charges Land Transaction Tax, both with different bands and rates from SDLT. This tool is built specifically for purchases in England and Northern Ireland.
How often do stamp duty rates and thresholds change?
SDLT bands get revised periodically through government budgets, the additional property surcharge, for example, rose from 3% to 5% in the October 2024 Budget. Treat this calculator as a planning estimate and confirm the exact figure with your solicitor before exchange, since rates can shift between when you start house-hunting and when you complete.
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