How SDLT works and how this calculator helps
Stamp Duty Land Tax, commonly shortened to SDLT, is a tax levied by HMRC on the purchase of residential property and land in England and Northern Ireland. If you are buying a property in Scotland you would pay Land and Buildings Transaction Tax instead, and in Wales you would pay Land Transaction Tax, both of which have their own rates and thresholds. This calculator focuses exclusively on SDLT as it applies in 2026.
SDLT is charged on the portion of the purchase price that falls within each rate band, not on the total price at a flat rate. This is sometimes called a "slice" system and it works similarly to income tax. The first slice of the price up to 125000 is taxed at 0%, meaning you pay nothing on that portion. The next slice is taxed at 2%, the one after that at 5%, and so on. Only the amount within each band is multiplied by that band's rate, and the total SDLT is the sum of all slices. This progressive structure means you never face a sudden jump in tax just because the price crosses a threshold.
I built this calculator to make the process transparent. You enter the property price, select your buyer type, and indicate whether you are a UK resident. The calculator then works through each band, applies any surcharges for additional properties or non-resident status, and presents a clear breakdown showing exactly how much tax falls within each slice. It also shows the effective tax rate, which is the total SDLT expressed as a percentage of the purchase price, and the net cost, which is the purchase price plus the SDLT.
The effective tax rate is a particularly useful figure because it lets you compare the real tax burden across different price points. For example, a property at £300,000 has a much lower effective rate than one at £1,000,000, even though both use the same band structure. Understanding this helps you budget accurately and avoid surprises at completion.
SDLT is due within 14 days of completion, which is the date the property legally becomes yours. Your solicitor or conveyancer will normally submit the SDLT return and payment on your behalf as part of the conveyancing process. Late payments attract penalties and interest from HMRC, so it is important to have the funds ready. For most purchases, the SDLT is funded from the buyer's cash contribution and is paid alongside the deposit and legal fees on the day of completion.
One common misconception is that SDLT applies to all property transactions. In fact, transfers between spouses or civil partners as part of a divorce or dissolution are usually exempt. Inherited properties do not trigger SDLT either, although they may be subject to inheritance tax. Shared ownership purchasers can choose to pay SDLT on the full market value at the outset or on the share they are purchasing, with additional SDLT due when they staircase to a larger share. These edge cases are best discussed with a solicitor, but for the vast majority of straightforward purchases, this calculator gives you an accurate figure in seconds.
Current SDLT rates and bands explained for 2026
The SDLT rates for residential property in England and Northern Ireland were updated in April 2025 and remain in force for 2026. Here I will walk you through each band so you understand precisely how the tax is calculated.
The first band covers the portion of the purchase price from zero up to £125,000. This is the nil-rate band and the rate is 0%. If you buy a property for £125,000 or less, you pay no SDLT at all. This threshold was reduced from the temporary £250,000 level that applied during the pandemic-era stamp duty holiday, returning to the long-standing £125,000 figure from April 2025.
The second band covers the portion from £125,001 to £250,000. The rate here is 2%. So if you buy a property for exactly £250,000, you pay 2% on £125,000, which comes to £2,500. Nothing is charged on the first £125,000 because that falls in the nil-rate band.
The third band covers £250,001 to £925,000 at a rate of 5%. This is the band most buyers in the South East and London will encounter. For a property priced at £500,000, for instance, you would pay £2,500 on the second band and £12,500 on the portion from £250,001 to £500,000, giving a total SDLT of £15,000.
The fourth band covers £925,001 to £1,500,000 at a rate of 10%. This higher rate kicks in only on the portion above £925,000. A buyer purchasing a property for £1,200,000 would pay the lower rates on the first £925,000 and then 10% on the £275,000 above that threshold.
The fifth and highest band applies to the portion over £1,500,000 at a rate of 12%. For very high-value properties, this top rate can result in significant tax bills. A £2,000,000 purchase, for example, would incur SDLT of approximately £151,250 under the standard rates.
It is worth noting that these rates apply to freehold purchases and new leasehold grants where the lease premium exceeds the relevant threshold. Leasehold properties also attract SDLT on the net present value of the rent if it exceeds £125,000, although that calculation is separate and more complex.
Non-residential and mixed-use properties have a completely different rate structure, with a nil-rate band of £150,000, a 2% band up to £250,000, and a flat 5% above £250,000. This calculator deals only with residential transactions, which account for the vast majority of SDLT queries. If you are purchasing commercial property or mixed-use land, I recommend consulting HMRC's guidance or a tax adviser for an accurate figure.
All rates are set by the Finance Act and can be changed by the Chancellor in a Budget or fiscal event. I update this calculator promptly whenever HMRC publishes revised rates, so the figures you see here reflect the latest position for 2026.
First-time buyer relief and additional property rules
Two of the most important SDLT variations in 2026 are the first-time buyer relief and the additional property surcharge. Both can make a substantial difference to the amount of tax you pay, so it is essential to understand how they work.
First-time buyer relief is available if you have never owned a property anywhere in the world and the purchase price is £625,000 or less. Under this relief, the nil-rate band is extended from the standard 125000 all the way up to 300000. That means you pay absolutely no SDLT on the first 300000 of the purchase price. On the portion from £425,001 to £625,000, you pay 5%. The maximum SDLT a first-time buyer can pay under this relief is therefore 5% of £200,000, which is £10,000.
If the property costs more than £625,000, the relief disappears entirely and you revert to the standard rates. There is no taper or partial relief. This cliff edge means that a first-time buyer purchasing at £625,000 pays £10,000 in SDLT, while one purchasing at £625,001 pays the full standard amount of approximately £31,250. It is a significant jump and something to bear in mind during price negotiations.
To qualify, every purchaser named on the transaction must be a first-time buyer. If you are buying jointly with someone who already owns property, neither of you can claim the relief. HMRC defines a first-time buyer as an individual who has never owned a freehold or leasehold interest in a dwelling anywhere in the world. This includes properties you may have inherited or been gifted.
The additional property surcharge is a 5% premium that applies when you buy a residential property and you already own one or more other residential properties. This covers second homes, holiday lets, buy-to-let investments, and any other additional dwelling. The 5% is added to each rate band, so the nil-rate band effectively becomes 5%, the 2% band becomes 5%, the 5% band becomes 8%, and so on. On a £300,000 additional property, the surcharge alone adds £9,000 to the standard SDLT bill of £5,000, bringing the total to £14,000.
There is an important exception. If you are replacing your main residence, meaning you are selling your current home and buying a new one, you do not pay the surcharge on the new property, provided the sale completes on or before the purchase. If you buy before you sell, you pay the surcharge upfront but can claim a refund once the old property is sold, provided the sale happens within 36 months. The refund claim must be made within 12 months of the sale of the old property or 12 months of the filing date, whichever comes later.
For non-UK residents, an additional 2% surcharge applies on top of the standard rates and, where relevant, on top of the additional property surcharge as well. This means a non-UK resident buying an additional property could face a combined surcharge of 5% plus 2%, totalling 5% on top of the base rates. The non-resident surcharge was introduced in April 2021 and applies to anyone who is not present in the UK for at least 183 days in the 12 months before the purchase. If you later become UK-resident within the qualifying period, you can apply for a refund of the 2% surcharge.
These rules interact in specific ways that can catch buyers out. The calculator handles all combinations automatically, applying the correct surcharges based on your selections, so you always see the accurate total.
SDLT changes for 2026 and tips to reduce your bill
The most significant recent change to SDLT came in April 2025, when the temporary thresholds introduced during the pandemic were reversed. The standard nil-rate band returned to 125000 from the temporary £250,000 level, and the first-time buyer nil-rate band returned to 300000 from £425,000 (having briefly been at £300,000 before October 2022 and then raised). These changes mean that most buyers are now paying more SDLT than they would have during the stamp duty holiday or the extended relief period.
For 2026, the rates and thresholds remain as they were set in April 2025. No further changes have been announced at the time of writing, although the Chancellor retains the power to adjust them at any fiscal event. I monitor all Budget statements and HMRC updates and will refresh this calculator immediately if any rates change.
Now, let me share some practical tips to help you reduce or manage your SDLT liability within the rules.
First, negotiate the price carefully. Because SDLT is calculated on the purchase price, even a small reduction can save you money. A property at £250,000 attracts £2,500 in SDLT, but if you negotiate down to £249,000, you save £20 in tax. The savings become more meaningful at higher price points and near band thresholds.
Second, consider the first-time buyer threshold. If you are a first-time buyer looking at properties around the £625,000 mark, it may be worth negotiating below that figure. A purchase at £625,000 costs £10,000 in SDLT under the relief, while £630,000 costs approximately £31,500 under standard rates. That is a £21,500 difference for just £5,000 more on the price.
Third, understand the replacement main residence rules. If you are buying a new home before selling your old one, you will pay the additional property surcharge upfront, but you can reclaim it once the old home sells within 36 months. Make sure your solicitor is aware so they can help you lodge the refund claim promptly.
Fourth, if you are a non-UK resident planning to move to the UK, consider timing your purchase. If you become UK-resident within the relevant period, you can reclaim the 2% non-resident surcharge. This could save thousands on higher-value properties.
Fifth, fixtures and fittings can sometimes be separated from the property price. Items such as carpets, curtains, and freestanding appliances are not part of the property and do not attract SDLT. However, the valuation must be genuine and reasonable. HMRC has the power to challenge inflated apportionments, so always take professional advice before splitting the price in this way.
Sixth, for investors considering multiple properties, the additional 5% surcharge is a significant cost. Some investors choose to purchase through a company structure for other reasons, but this does not avoid the surcharge. Companies buying residential property at £40,000 or more are subject to the same additional rates. Above £500,000, a flat 15% rate may apply under the Annual Tax on Enveloped Dwellings rules, though reliefs exist for genuine property rental businesses.
I keep all the data in this calculator aligned with the latest HMRC guidance. The official sources are gov.uk and HMRC's SDLT manual. If you have a complex situation involving trusts, companies, or mixed-use property, I recommend speaking to a qualified tax adviser alongside using this calculator for an initial estimate.