Do you pay higher rate SDLT if your partner owns another property but is not buying with you?

Introduction

A common Stamp Duty Land Tax (SDLT) question arises where one person is buying a new home alone, but their partner already owns or co-owns another property. People often worry that their partner’s other property will trigger the higher residential rates, even if the partner is not going on the title deeds or the mortgage.

The key point is that SDLT looks closely at who the purchaser is for the new transaction. In many cases, if only one person is buying and that person is replacing their own main residence, the other person’s separate property ownership does not affect the SDLT result.

The Question

A homeowner owns their current home in their sole name and wants to move to a new home, again in their sole name only. Their partner lives with them, but the partner separately co-owns another dwelling with a family member. The partner will not be named on the title deeds, will not be on the mortgage for the new purchase, and will not contribute to the purchase.

The question is whether the buyer pays SDLT at the standard residential rates or the higher rates for additional dwellings.

Nick’s Explanation

Nick’s reasoning was that the SDLT position depends on the legal purchaser of the new property. If the new dwelling is being bought by one person alone, SDLT looks at that person’s property interests, not at a non-buying partner’s separate ownership.

In anonymised form, his explanation was:

“The legislation only considers property interests held by the purchaser. If the partner is not named on the deeds or mortgage for the new property, the partner’s existing ownership does not affect the SDLT calculation for that purchase.”

He also explained that where the buyer is selling their old main residence on or before completion of the new purchase, the replacement of main residence rules should prevent the higher rates from applying. If the old home is not sold by completion, the higher rates may apply at first, but a refund may later be available if the former main residence is sold within the permitted period.

The Law

SDLT on residential property is charged under section 55 of the Finance Act 2003. The ordinary residential rates are applied by reference to the amount paid for the property.

The higher rates for additional dwellings are introduced through section 55(4A) of the Finance Act 2003, which brings in Schedule 4ZA.

Under paragraph 3 of Schedule 4ZA, the higher rates can apply where, at the end of the effective date of the transaction, the purchaser:

• has a major interest in another dwelling, and
• is not replacing their only or main residence.

For an individual buyer, the starting point is the buyer’s own property interests. If only one person is buying the new property, it is that person’s position that is tested.

Schedule 4ZA also contains the replacement of only or main residence rules. Broadly, where a buyer sells a former only or main residence and buys a new one, the higher rates may not apply. If the sale of the former residence happens after the new purchase, the buyer may have to pay the higher rates first and then reclaim the surcharge if the old residence is sold within the relevant time limit, usually three years.

Analysis

Step 1 is to identify the purchaser of the new property.

Here, the new dwelling is being bought by one person alone. That means SDLT is assessed by looking at that sole buyer’s position.

Step 2 is to ask whether the buyer will own another dwelling at the end of the day of completion.

If the buyer still owns their current home at the end of completion day, then they will own two dwellings at that point: the old home and the new one. That usually brings the higher rates into point unless the replacement exception already applies.

Step 3 is to consider whether the buyer is replacing their only or main residence.

If the current home is sold on or before the day the new purchase completes, the buyer is generally replacing their only or main residence. In that case, the higher rates should not apply.

Step 4 is to consider the partner’s separate property ownership.

Because the partner is not buying the new property, is not on the title, and is not on the mortgage, the partner’s co-ownership of another dwelling does not by itself make the buyer liable for the higher rates. The partner’s property is not treated as the buyer’s property simply because they are in a relationship or living together.

Step 5 is to consider what happens if the old home is not sold in time.

If the buyer completes on the new home before selling the old one, the higher rates will usually be payable on completion because the buyer then owns more than one dwelling and has not yet completed the replacement in the way required by the legislation. If the old main residence is later sold within three years, the buyer can usually claim a refund of the additional amount.

This is not an “uninhabitable” case, but where readers are considering whether a property is not suitable for use as a dwelling, it is important to note that the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Outcome

If only one person is buying the new home, and their partner is not on the deeds or mortgage, the partner’s separate ownership of another property does not by itself trigger the higher SDLT rates.

• If the buyer sells their current main residence on or before completion of the new purchase, standard residential SDLT rates should apply.
• If the buyer has not sold their current home by completion, the higher rates will usually apply initially, but the additional SDLT may be reclaimed if the old home is sold within three years.

Practical Steps

To assess the SDLT position properly, a buyer should:

• confirm exactly who will be the legal purchaser of the new property;
• confirm who will be named on the title deeds and mortgage;
• check whether their current only or main residence will be sold on or before completion of the new purchase;
• keep evidence showing that the old property was their only or main residence;
• if the old home is sold after the new purchase, check the deadline for claiming a refund of the higher rates.

In practice, the timing of completion on the sale of the old home is often the deciding factor.

Conclusion

Where a person buys a new home in their sole name, their non-buying partner’s separate property ownership is normally irrelevant for SDLT. The main issue is whether the buyer is replacing their own only or main residence. Sell the old home by completion, and standard rates should usually apply. If not, the higher rates may be payable first, with a possible refund later.

Legal References Used

• Finance Act 2003, section 55
• Finance Act 2003, section 55(4A)
• Finance Act 2003, Schedule 4ZA, paragraph 3
• Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799

This page was last updated on 22 March 2026.

See all questions and answers categorized in this sitemap. Or use Google site search below.