Stamp Duty When Selling and Buying at the Same Time
How stamp duty works when you are selling one property and buying another, including the additional rate surcharge and refund rules for England and Wales.
What you need to know
When you sell one home and buy another, you pay stamp duty only on the purchase. If you complete the purchase before selling your old home, you may owe an additional 5% surcharge on top of standard SDLT rates. You can reclaim this surcharge if you sell the old property within 36 months.
- Stamp duty (SDLT) is paid by the buyer, not the seller. You only owe SDLT on the property you are purchasing.
- If you own two residential properties at the point of purchase, you pay a higher rate surcharge of 5 percentage points on every SDLT band.
- You can reclaim the surcharge if you sell your previous main residence within 36 months of buying the new one.
- Completing your sale and purchase on the same day can avoid the surcharge entirely, as HMRC treats this as a main residence replacement.
- From 1 April 2025, the standard SDLT nil-rate band returned to £125,000, increasing the tax bill for most buyers.
Pine handles the legal prep so you don't have to.
Check your sale readinessIf you are selling your home and buying another, stamp duty is one of the biggest costs you need to plan for. The rules are not straightforward — particularly if there is any gap between your sale and purchase. Depending on timing, you could end up paying thousands of pounds more than necessary.
This guide explains exactly how Stamp Duty Land Tax (SDLT) works when you are selling and buying at the same time, including the higher rate surcharge, the refund process, and how to structure your transaction to minimise your tax bill. Everything here applies to England and Northern Ireland — Scotland and Wales have separate land transaction taxes with their own rules.
How stamp duty works: the basics
Stamp Duty Land Tax is a tax you pay when you buy residential property in England or Northern Ireland above a certain price threshold. It is paid by the buyer, not the seller. As a seller, you do not pay SDLT on the property you are selling — but you do pay it on the property you are buying to replace it.
SDLT is calculated on a tiered basis, similar to income tax. You pay different rates on different portions of the purchase price, not a flat rate on the whole amount. The tax is due within 14 days of completion, and your solicitor or conveyancer files the return and makes the payment on your behalf as part of the conveyancing process.
Current SDLT rates from 1 April 2025
The temporary stamp duty thresholds introduced in September 2022 ended on 31 March 2025. From 1 April 2025, the standard residential SDLT rates reverted to their previous levels, meaning most buyers now pay more than they would have during the temporary relief period.
| Purchase price band | Standard rate | Higher rate (with surcharge) |
|---|---|---|
| Up to £125,000 | 0% | 5% |
| £125,001 to £250,000 | 2% | 7% |
| £250,001 to £925,000 | 5% | 10% |
| £925,001 to £1,500,000 | 10% | 15% |
| Over £1,500,000 | 12% | 17% |
Source: GOV.UK — Stamp Duty Land Tax: Residential property rates. The higher rate column includes the 5% surcharge introduced in the Autumn Budget 2024.
First-time buyers benefit from a separate nil-rate band of £300,000 on properties costing up to £500,000 (from 1 April 2025). If you are a first-time buyer, you will not be affected by the higher rate surcharge because you do not already own a property.
Worked examples: standard rate vs higher rate
To illustrate the difference the surcharge makes, here are two worked examples for a property purchase at £300,000 and £500,000.
Example 1: buying at £300,000
| Band | Standard SDLT | Higher rate SDLT |
|---|---|---|
| First £125,000 at 0% / 5% | £0 | £6,250 |
| £125,001 to £250,000 at 2% / 7% | £2,500 | £8,750 |
| £250,001 to £300,000 at 5% / 10% | £2,500 | £5,000 |
| Total | £5,000 | £20,000 |
The higher rate surcharge adds £15,000 to the stamp duty bill on a £300,000 purchase. That is money you need to find upfront, even if you plan to reclaim it later.
Example 2: buying at £500,000
| Band | Standard SDLT | Higher rate SDLT |
|---|---|---|
| First £125,000 at 0% / 5% | £0 | £6,250 |
| £125,001 to £250,000 at 2% / 7% | £2,500 | £8,750 |
| £250,001 to £500,000 at 5% / 10% | £12,500 | £25,000 |
| Total | £15,000 | £40,000 |
At £500,000, the surcharge adds £25,000. For many buyers, this is a significant sum that may need to come from savings, a bridging loan, or a larger mortgage — all of which carry costs of their own.
The higher rate surcharge: when it applies
The higher rate surcharge applies when, at the end of the day of your purchase, you own two or more residential properties. It does not matter whether the second property is a buy-to-let, a holiday home, or simply your old home that has not yet sold. If you own it, the surcharge applies.
There is an important exception: if you are replacing your main residence, the surcharge does not apply. HMRC considers you to be replacing your main residence if:
- You are buying a new home that will be your main residence.
- You have sold (or are selling on the same day) a property that was previously your only or main residence.
- You have not acquired any other main residence between selling the old one and buying the new one.
In practical terms, this means the surcharge typically applies if you buy before you sell. If you sell before you buy, or if the transactions complete on the same day, the surcharge should not apply.
Selling and buying on the same day
For sellers in a chain, the ideal scenario from a stamp duty perspective is to have your sale and purchase complete on the same day. When both transactions complete simultaneously, HMRC does not consider you to have owned two properties at the same time, and the higher rate surcharge does not apply.
This is the standard approach in most chain transactions. Your solicitor and the other parties' solicitors coordinate to ensure completion happens on the same day across the entire chain. Our guide to what happens between exchange and completion explains how this process works in practice.
In some cases, sellers opt for a simultaneous exchange and completion, where both stages happen on the same day. While this carries additional risks (there is no cooling-off period between exchange and completion), it can work well in short chains or chain-free transactions and ensures the stamp duty position is straightforward.
What if you buy before you sell?
Sometimes the timing does not work out perfectly. You may find your ideal next home before your current property has sold, or your buyer may pull out at the last minute, leaving you to complete the purchase without a corresponding sale. In these situations, you will own two properties at the point of purchase, and the higher rate surcharge will apply.
The good news is that this is not necessarily permanent. HMRC allows you to reclaim the surcharge if you sell your previous main residence within a set time frame.
The 36-month refund window
If you pay the higher rate surcharge because you bought before selling, you can apply to HMRC for a refund once your previous property sells. The conditions are:
- You must sell your previous main residence within 36 months of buying the new one.
- The property you are selling must have been your only or main residence at some point.
- You must claim the refund within 12 months of the sale of the old property, or within 12 months of the filing date of the SDLT return for the new purchase, whichever is later.
You can claim the refund by writing to HMRC or by amending your original SDLT return. Full details are available on the GOV.UK guidance on buying an additional residential property.
Cash flow warning: Even though you can reclaim the surcharge, you need to pay it upfront at completion. On a £300,000 purchase, that means finding an additional £15,000 on top of your deposit and standard SDLT. Make sure your solicitor, mortgage adviser, and lender are all aware of this requirement well before completion day.
How to avoid or minimise the surcharge
There are several legitimate strategies for avoiding or reducing the impact of the higher rate surcharge when selling and buying at the same time:
- Sell first, buy second. The simplest approach. If you complete the sale of your old home before completing on the new one, you do not own two properties and the surcharge does not apply. The downside is that you may need to arrange temporary accommodation.
- Complete on the same day. If both transactions complete simultaneously, HMRC treats this as a replacement of your main residence. This is the most common approach for chain transactions. Making sure you are sale-ready from the outset reduces the risk of delays that could cause the dates to diverge.
- Pay and reclaim. If you must buy before selling, pay the surcharge at completion and reclaim it once the old property sells within 36 months. Budget for the upfront cost and keep meticulous records.
- Use a bridging loan carefully. Some buyers use short-term bridging finance to buy the new property before the old one sells. This triggers the surcharge, but if the old property sells quickly, you can reclaim it. Factor in the bridging loan interest and arrangement fees alongside the temporary surcharge.
The role of your solicitor in managing stamp duty
Your solicitor or conveyancer is responsible for calculating your SDLT liability, filing the return with HMRC, and paying the tax on your behalf from the purchase funds. They should advise you on whether the higher rate surcharge applies to your transaction and explain the refund process if relevant.
It is essential that your solicitor understands your full property position — including any other properties you own, whether you are in a chain, and the planned completion dates for both your sale and purchase. This information feeds directly into the SDLT calculation. If you are unsure about any aspect of the process, our guide to conveyancing costs explains what your solicitor should cover as part of their fee.
If you end up paying the surcharge and need to reclaim it later, your solicitor can handle the refund application. Some firms include this as part of their service; others charge a small additional fee (typically £100 to £300). Ask about this before you instruct.
Stamp duty and chains: what sellers need to know
Property chains create particular complications for stamp duty. In a chain, multiple buyers and sellers are linked together, with each transaction depending on the others. If one link in the chain breaksor is delayed, the carefully coordinated completion dates can shift, potentially leaving you owning two properties and liable for the surcharge.
As a seller who is also buying, the key risk is that your sale falls through or is delayed while your purchase proceeds. This is one reason why preparing your legal paperwork early is so important — it reduces the chance of delays on your side of the transaction and keeps the chain moving smoothly.
Understanding how estate agent fees and sale progression work can also help you choose an agent who will actively manage the chain and reduce the risk of costly delays. A good agent will keep all parties informed and push for aligned completion dates throughout the process.
Scotland and Wales: different rules
SDLT applies only to property purchases in England and Northern Ireland. If you are buying in Scotland or Wales, different taxes apply:
- Scotland: Land and Buildings Transaction Tax (LBTT), administered by Revenue Scotland. The Additional Dwelling Supplement (ADS) is currently 8% and applies when you buy an additional property. Refund rules differ from SDLT — you must sell your previous main residence within 18 months (not 36).
- Wales: Land Transaction Tax (LTT), administered by the Welsh Revenue Authority. The higher rates residential surcharge is 6% in Wales. The refund period for selling your previous main residence is 36 months, similar to SDLT.
If your sale is in England but your purchase is in Scotland (or vice versa), you will be dealing with two different tax regimes. Take professional advice to make sure you are handling both correctly.
Common mistakes to avoid
Stamp duty errors on linked sale-and-purchase transactions are more common than you might expect. Here are the most frequent pitfalls:
- Assuming same-day completion means no surcharge automatically. You still need to meet the main residence replacement conditions. If the property you are selling was never your main residence (for example, a buy-to-let), the surcharge will still apply even with same-day completion.
- Missing the refund deadline. The 12-month claim window runs from the date of sale of your old property. If you forget or delay, you lose the right to reclaim the surcharge entirely.
- Not budgeting for the upfront surcharge. Even if you intend to reclaim it, you need the funds available at completion. Make sure your mortgage offer and deposit calculations account for the full amount.
- Ignoring the impact on your mortgage. Some lenders treat the higher rate SDLT as part of the total cost of purchase. If the surcharge increases your total outlay, your lender may require a larger deposit or offer less favourable terms.
- Forgetting about other properties you own. The surcharge applies if you own any additional residential property, not just the one you are selling. Inherited properties, buy-to-lets, or properties owned abroad can all trigger the surcharge.
Sources and further reading
- Stamp Duty Land Tax — Residential Property Rates (GOV.UK)
- SDLT: Buying an Additional Residential Property (GOV.UK / HMRC guidance)
- Autumn Budget 2024 — SDLT Higher Rates for Additional Dwellings (GOV.UK)
- Finance Act 2003, Part 4 — Stamp Duty Land Tax (legislation.gov.uk)
- Stamp Duty Land Tax — Overview (GOV.UK)
- Land and Buildings Transaction Tax (Revenue Scotland)
- Land Transaction Tax Guide (Welsh Revenue Authority)
- SDLT Reliefs and Exemptions (GOV.UK)
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Frequently asked questions
Do I pay stamp duty when I sell my house and buy another at the same time?
You pay stamp duty on the property you are buying, not on the one you are selling. If you complete the purchase before or on the same day as the sale of your previous main residence, you may need to pay the higher rate surcharge of 5 percentage points on top of the standard SDLT rates. However, if your sale and purchase complete simultaneously, HMRC may treat this as a replacement of your main residence, meaning the surcharge does not apply.
What is the stamp duty higher rate surcharge?
The higher rate surcharge is an additional 5 percentage points added to each SDLT band when you buy a residential property while still owning another one. It was increased from 3% to 5% in the October 2024 Autumn Budget. The surcharge applies to the entire purchase price and is designed to discourage ownership of multiple residential properties. It affects buy-to-let investors, second home buyers, and anyone who temporarily owns two homes during a chain transaction.
Can I get a refund of the higher rate stamp duty surcharge?
Yes. If you pay the higher rate surcharge because you bought your new home before selling your old one, you can apply to HMRC for a refund once the previous property is sold. You must sell within 36 months of buying the new property and the old property must have been your main residence at some point. The refund must be claimed within 12 months of the sale of the old property, or within 12 months of the filing date of the SDLT return, whichever is later.
What are the current SDLT rates for 2025-26?
From 1 April 2025, the standard SDLT rates for residential property in England and Northern Ireland are: 0% on the first £125,000, 2% on the portion from £125,001 to £250,000, 5% on the portion from £250,001 to £925,000, 10% on the portion from £925,001 to £1,500,000, and 12% on any amount above £1,500,000. First-time buyers have a separate nil-rate band of £300,000 on properties up to £500,000.
How does simultaneous exchange and completion affect stamp duty?
If your sale and purchase complete on the same day through a simultaneous exchange and completion, you are treated as replacing your main residence rather than owning two homes at once. This means the higher rate surcharge should not apply, provided the property you are selling was your main residence. Your solicitor will need to coordinate both transactions carefully to ensure completion happens on the same day, which is critical from both a legal and a stamp duty perspective.
Do I pay stamp duty in Scotland or Wales?
Scotland and Wales have their own land transaction taxes. Scotland uses Land and Buildings Transaction Tax (LBTT), managed by Revenue Scotland, with its own rates and Additional Dwelling Supplement of 8%. Wales uses Land Transaction Tax (LTT), managed by the Welsh Revenue Authority, with a higher rates residential surcharge of 6%. The rules for refunds on replacement of main residence differ slightly in each country, so you should take advice specific to the relevant jurisdiction.
What happens if my sale falls through after I have bought?
If you bought your new home expecting to sell your old one and the sale then falls through, you still have 36 months from the date of your new purchase to sell the old property and claim a refund of the surcharge. If you cannot sell within that window, you will not be able to reclaim the surcharge. This is one reason why many sellers try to align their sale and purchase as closely as possible, or even opt for a simultaneous exchange and completion to avoid the risk entirely.
Is stamp duty payable on exchange or completion?
Stamp duty is triggered by the effective date of the transaction, which is normally the date of completion, not exchange. You have 14 days from the effective date to file your SDLT return and pay the tax due. Your solicitor or conveyancer handles the filing and payment on your behalf, typically deducting the amount from the purchase funds on completion day. Late filing attracts automatic penalties and interest from HMRC.
Can I avoid the higher rate surcharge by selling my old home first?
Yes. If you sell your existing main residence before completing on your new purchase, you will not own two properties at the point of purchase and the higher rate surcharge will not apply. This is the simplest way to avoid the surcharge entirely. However, it means you may need temporary accommodation between the sale and purchase, which has its own costs and inconvenience. Many sellers use a chain arrangement or simultaneous completion to avoid this gap.
How much could the higher rate surcharge add to my stamp duty bill?
The surcharge can add a substantial amount. On a £300,000 property, the standard SDLT is £2,500, but with the 5% surcharge the total rises to £17,500 — an additional £15,000. On a £500,000 property, standard SDLT is £12,500 while the surcharge brings the total to £37,500. Even if you intend to reclaim the surcharge later, you need to fund the additional amount upfront, which can significantly affect your cash flow and mortgage calculations.
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