Do you pay higher rate SDLT if you buy a new home before selling your existing homes?

Introduction

Buyers often ask whether they can avoid the higher rates of Stamp Duty Land Tax (SDLT) when they are moving home but have not yet sold their existing property. This issue commonly arises where a purchase is funded with a bridging loan and the buyer expects to sell one or more existing homes shortly afterwards.

The key point is that SDLT is tested at the effective date of the purchase, which is usually completion. If, on that date, the buyers still own other dwellings and the new property is not yet a replacement for an already disposed of only or main residence, the higher rates for additional dwellings usually apply. In many cases, the surcharge can only be reclaimed later if the statutory conditions are met.

The Question

A couple plan to buy a new-build dwelling for £550,000. Each of them already owns another home, and neither of those homes has been sold before the planned completion date. They have arranged bridging finance so that they can complete first and sell later.

They have been told by one adviser that the SDLT may be around the standard residential amount and that payment might be deferred by contacting HMRC after completion. Their conveyancer has instead said that the SDLT due on completion will be much higher because the higher rates for additional dwellings apply.

The practical question is: which view is correct, and can the surcharge be reclaimed later?

Nick’s Explanation

Nick’s explanation was that the conveyancer’s figure was the correct starting point on the facts given. The reason is that SDLT is charged by reference to the position at completion, not by reference to what the buyers hope will happen later.

In anonymised form, his reasoning was:

“Because both buyers already own another dwelling on the effective date of completion, the higher rates for additional dwellings apply unless the new purchase is already a replacement of an only or main residence. If the previous main residence is sold later, the surcharge may be reclaimed, but it still has to be paid first.”

He also explained that there is no general statutory mechanism allowing a buyer simply to ask HMRC to defer SDLT payment after completion. The tax must normally be filed and paid within the statutory deadline.

On the figures provided, his calculation was:

• 0% on the first £125,000 = £0
• 2% on the next £125,000 = £2,500
• 5% on the remaining £300,000 = £15,000
• Standard residential SDLT = £17,500
• Higher rates surcharge at 5% on £550,000 = £27,500
• Total SDLT due on completion = £45,000

He then identified the real issue as whether the surcharge could later be reclaimed under the replacement of only or main residence rules, and that depends on which of the couple’s existing dwellings counts as the relevant main residence for these purposes.

The Law

SDLT is charged under Part 4 of the Finance Act 2003.

Section 42(1) FA 2003 provides that SDLT is charged on land transactions. Section 43(1) defines a land transaction as any acquisition of a chargeable interest. Section 50 and the related provisions deal with chargeable consideration, which in a purchase case is usually the price paid for the property.

The higher rates for additional dwellings are contained in Schedule 4ZA FA 2003. Broadly, they apply where an individual acquires a major interest in a dwelling and, at the effective date of the transaction:

• the purchaser owns an interest in another dwelling, and
• the dwelling being acquired is not a replacement for the purchaser’s only or main residence.

The effective date is usually completion. Section 44(3) to (4) FA 2003 makes this clear where the transaction is completed without earlier substantial performance.

Section 76 FA 2003 sets the filing and payment deadline. SDLT must be reported and paid within the statutory period after the effective date. There is no general rule allowing payment to be postponed merely because the buyer expects to sell another property soon afterwards.

Where the old main residence is sold after the new purchase, paragraph 3 of Schedule 4ZA may allow a refund of the higher rates surcharge, provided the statutory conditions are met. In simple terms, the buyer must dispose of a dwelling that was their only or main residence within the relevant three-year period.

Special rules apply to married couples and civil partners living together. Paragraph 9(1) of Schedule 4ZA treats them as one unit for the purposes of the Schedule. That means the analysis is not done separately for each spouse or civil partner.

Analysis

The analysis can be broken down into four steps.

First, identify the position at completion. If the couple complete the purchase while still owning their existing dwellings, they will each still own another dwelling on the effective date. That immediately raises the higher rates issue.

Second, ask whether the new purchase is already a replacement of an only or main residence. If neither existing home has yet been sold, the answer will usually be no. A future intended sale is not enough. The replacement test is based on the statutory conditions, not on intention alone.

Third, calculate the SDLT due at that point. On a purchase price of £550,000, the standard residential SDLT comes to £17,500 on the figures used in Nick’s explanation. The 5% higher rates surcharge then adds £27,500, giving a total of £45,000 payable on completion.

Fourth, consider whether the surcharge can later be reclaimed. That depends on whether the buyers later dispose of the dwelling that counts as their former only or main residence for Schedule 4ZA purposes.

This is where the facts matter. If one member of the couple has a property that clearly served as the couple’s relevant only or main residence, disposal of that property within the permitted period may allow the surcharge to be reclaimed even if another property remains owned. But if the facts show that the other dwelling was the relevant main residence, the reclaim position may be different.

For married couples and civil partners living together, paragraph 9 means HMRC looks at them as a single unit. So the reclaim analysis is not simply “one sale each.” It turns on whether the dwelling sold is the one that satisfies the statutory replacement test for the couple.

In practice, evidence of occupation is important. HMRC may look at where the couple actually lived, where they were registered, the address used for bills and correspondence, and the overall pattern of residence. Merely owning a property or intending to move there is not enough to make it the only or main residence.

If a buyer instead argues that one of the existing dwellings was not suitable for use as a dwelling, that argument now faces a relatively high threshold following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. The Court of Appeal confirmed that “not suitable for use” is not a low bar. Ordinary disrepair, inconvenience, or the need for works will often not be enough. The condition generally has to be serious before the dwelling falls outside the charge on that basis.

Outcome

On the stated facts, the SDLT due on completion is the higher amount, not the lower standard residential amount alone. The surcharge is payable up front because, at completion, the buyers still own other dwellings and have not yet completed the disposal needed to show replacement of an only or main residence.

There is no general right to defer SDLT by contacting HMRC after completion. The correct route is usually:

• pay the SDLT due on time at completion, and
• if the statutory replacement conditions are later met, claim a refund of the higher rates surcharge.

Whether a refund will be available depends on which existing property qualifies as the former only or main residence under Schedule 4ZA.

Practical Steps

A buyer in this position should take the following steps:

• Confirm the SDLT computation based on the position at completion, not on future intentions.
• Check whether the buyers are married or in a civil partnership and living together, because paragraph 9 may apply.
• Identify which existing dwelling was genuinely the only or main residence for SDLT purposes.
• Gather evidence of occupation, such as council tax records, utility bills, electoral registration, insurance, and correspondence addresses.
• If completion must happen before sale of the old home, budget for the higher rates SDLT being payable first.
• If the former main residence is later sold within the statutory time limit, submit a refund claim for the surcharge.
• Do not assume that a property is outside the rules because it was in poor condition; after Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold for “not suitable for use as a dwelling” is relatively high.

Conclusion

If you buy a new home before selling your existing home or homes, the higher rates of SDLT will usually apply at completion. You cannot normally defer payment simply because a sale is expected soon afterwards. The surcharge may be reclaimable later, but only if the disposal of the former only or main residence satisfies the conditions in Schedule 4ZA FA 2003.

Legal References Used

• Finance Act 2003, Part 4
• Finance Act 2003, section 42(1)
• Finance Act 2003, section 43(1)
• Finance Act 2003, section 44(3) to (4)
• Finance Act 2003, section 50
• Finance Act 2003, section 76
• Finance Act 2003, Schedule 4ZA
• Finance Act 2003, Schedule 4ZA, paragraph 1(1)
• Finance Act 2003, Schedule 4ZA, paragraph 3
• Finance Act 2003, Schedule 4ZA, paragraph 9(1)
• Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799

This page was last updated on 22 March 2026.

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