How much SDLT do you pay when you sell one property and buy another buy-to-let property?

Introduction

People often ask whether buying a buy-to-let property automatically triggers the higher rates of Stamp Duty Land Tax (SDLT). The key issue is not simply whether the new property will be let out, but whether, at the end of the day of purchase, the buyer owns more than one dwelling. If a person is replacing their only property and will own only one property at any time, the higher rates for additional dwellings may not apply.

The Question

A buyer is selling one property and buying a new buy-to-let property for £395,000. The buyer says they will own only one property at any one time and wants to know how much SDLT is payable.

Nick’s Explanation

Nick’s reasoning was that, on the facts given, the buyer would be charged at the standard residential SDLT rates rather than the higher rates for additional dwellings. In anonymised form, his calculation was:

• First £250,000 at 0% = £0
• Next £145,000 at 5% = £7,250

On that basis, the total SDLT would be £7,250.

The important point in his explanation is that a buy-to-let purchase does not automatically attract the higher SDLT rates. What matters is whether the purchase is an “additional dwelling” under the legislation at the effective date of the transaction.

The Law

SDLT on residential property is charged under Finance Act 2003.

The ordinary residential rates are set by section 55 Finance Act 2003. For the rate structure referred to in the explanation above, the first £250,000 is charged at 0% and the portion from £250,001 to £925,000 is charged at 5%.

The higher rates for additional dwellings are imposed by Schedule 4ZA to Finance Act 2003. Broadly, those higher rates apply if, at the end of the day of the purchase:

• the buyer owns an interest in the purchased dwelling,
• the buyer owns an interest in another dwelling worth £40,000 or more, and
• the purchased dwelling is not a replacement of the buyer’s only or main residence within the statutory rules.

For many buyers, the practical question is whether they will still own another dwelling at the end of the day of completion. If not, the higher rates may not apply.

Analysis

Step 1: Identify the purchase price.

The purchase price is £395,000.

Step 2: Decide whether standard rates or higher rates apply.

On the facts given, the buyer will own only one property at any time. If that is correct, the purchase is not an additional dwelling at the end of the day of completion. That means the higher rates under Schedule 4ZA should not apply.

Step 3: Apply the standard residential rates.

• 0% on the first £250,000 = £0
• 5% on the remaining £145,000 = £7,250

Step 4: Total the SDLT.

Total SDLT = £7,250.

It is worth stressing that the fact the new property will be a buy-to-let does not, by itself, create a surcharge. The surcharge is about owning an additional dwelling, not about whether the property is owner-occupied or let.

If, however, the buyer still owns another dwelling at the end of the purchase day, or has a retained share in another dwelling that counts for SDLT purposes, the higher rates may need to be reconsidered.

Outcome

If the buyer genuinely sells their existing property and buys the new property so that they own only one dwelling at the end of the day of completion, the SDLT on a £395,000 residential purchase would be £7,250 using the standard residential rates described above.

Practical Steps

• Check exactly what is owned at the end of the day of completion, including any shares in other dwellings.
• Confirm whether the earlier property has actually been disposed of before or on the same day as the new purchase.
• Review whether any overseas dwellings, inherited interests, or partial interests might affect the SDLT position.
• Ask the conveyancer to confirm the SDLT treatment before filing the SDLT return.
• Keep completion statements and transfer documents in case HMRC later asks why the higher rates were not paid.

Conclusion

On the stated facts, the buyer would usually pay SDLT of £7,250, not the higher additional dwelling rates, because they would own only one property at a time. The buy-to-let purpose does not by itself create the surcharge.

Legal References Used

• Finance Act 2003, section 55
• Finance Act 2003, Schedule 4ZA

This page was last updated on 22 March 2026.

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