Do separated spouses pay higher SDLT when buying a property for an adult child?

Introduction

People often search for this issue where a married couple have separated, still own property between them, and want to help an adult child buy or occupy another home. The key question is whether they are still treated as one unit for the higher rates of Stamp Duty Land Tax (SDLT), or whether they can be treated separately because the separation is likely to be permanent.

That question matters because the higher rates for additional dwellings can apply even where the new property is being bought for a child rather than for the buyers themselves. The answer depends on both marital status rules in Schedule 4ZA to the Finance Act 2003 and on who is treated as the real owner of the new property for SDLT purposes.

The Question

A separated husband and wife jointly own two flats as tenants in common. One flat is occupied by the husband. The other is occupied by their adult son. They want to sell the son’s current flat and buy a larger one for him. They believe their separation is permanent, but they are not formally divorced. They want to know:

• whether they are still treated as a married couple for SDLT higher rate purposes;
• whether buying the replacement flat in one spouse’s sole name would avoid the surcharge if that spouse owns no other property; and
• whether buying in the adult son’s sole name, with a restriction on title, would be a better route.

Nick’s Explanation

Nick’s core point was that spouses are normally treated as a single unit for SDLT higher rate purposes, but there is an important exception. Under paragraph 9 of Schedule 4ZA to the Finance Act 2003, that single-unit treatment does not apply where they are legally separated, or are “separated in circumstances where the separation is likely to be permanent”.

In anonymised form, Nick explained the position like this:

“Based on the facts given, the spouses may be treated as not living together and therefore assessed individually for SDLT purposes. However, even if that is accepted, if the buyer already owns another residential property and the new purchase is not a replacement of that buyer’s own main residence, the 5% surcharge would still apply.”

He then identified possible structures:

• a bare trust for the adult child, where SDLT follows the beneficial owner rather than the trustee;
• a discretionary trust, which is usually less favourable for SDLT;
• purchase in the adult child’s own name, which is often the simplest route if the child owns no other property; and
• company ownership, which generally does not help because companies pay the higher rates on residential purchases.

Nick also noted that if the property is bought in the child’s sole name, a restriction may be entered on the title to limit dealings with the property, while still leaving the child as the legal and beneficial owner for SDLT purposes.

The Law

The relevant rules are in Schedule 4ZA to the Finance Act 2003, which imposes higher rates of SDLT on purchases of additional dwellings.

The main provisions are:

• Paragraph 3 of Schedule 4ZA: the higher rates apply where, at the end of the day of the transaction, the purchaser owns a major interest in another dwelling and the new purchase is not a replacement of the purchaser’s only or main residence.

• Paragraph 9 of Schedule 4ZA: spouses and civil partners living together are treated as one unit. But this does not apply where they are separated under a court order, by deed of separation, or “separated in circumstances where the separation is likely to be permanent”.

• Paragraph 12(2) of Schedule 4ZA: where a person purchases as trustee of a bare trust, the beneficiary is treated as the purchaser for higher-rates purposes.

In practical terms, that means there are two separate legal questions:

1. Are the spouses still treated as one unit?
2. If not, does the actual purchaser still own another dwelling so that the additional dwelling surcharge applies anyway?

Analysis

Step one is to consider whether the spouses are still treated as living together for SDLT. If the facts show a genuine separation likely to be permanent, paragraph 9(3) can disapply the normal spouse aggregation rule. A long separation, separate living arrangements, and no realistic prospect of resuming married life all point in that direction.

Step two is to identify the purchaser of the new flat for SDLT purposes.

If the separated husband buys the new flat in his own name, and he already owns another dwelling, the higher rates are likely to apply. That is because the new flat would be an additional dwelling and not a replacement of his own only or main residence.

If the separated wife buys the new flat in her sole name, the answer depends on whether she is truly treated separately and whether she owns any other dwelling at the effective date of the transaction. If she owns no other residential property at that point, and is not still aggregated with her spouse under paragraph 9, the higher rates may not apply. But that answer depends heavily on the underlying facts and on whether any prior transfers are genuine and effective.

That leads to a further point. Moving the existing flats into one spouse’s sole name just before the purchase may create its own SDLT and other tax issues, depending on the consideration given, mortgage debt assumed, and wider facts. It is not a simple administrative step. It needs separate analysis.

The cleanest SDLT route in this scenario is often to buy the property in the adult child’s sole name, provided the child does not already own another dwelling. In that case, the child is the purchaser, and the parents’ existing property ownership is generally irrelevant. If the child is both legal and beneficial owner, the purchase is assessed by reference to the child’s position.

A bare trust can sometimes achieve a similar SDLT result, because paragraph 12(2) looks to the beneficial owner. But the arrangement must genuinely be a bare trust. The adult child must be absolutely entitled. The parents cannot retain the beneficial ownership while merely describing the arrangement as a trust.

A discretionary trust is usually less attractive. Trust purchases of residential property often attract the higher rates by default, and the SDLT treatment becomes more complex.

Company ownership is also usually unattractive for this purpose. A company buying a dwelling generally pays the higher residential rates, and there may also be corporation tax and later extraction issues.

This is not an “uninhabitable” case, but for completeness, where buyers argue that a property is not suitable for use as a dwelling, the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. Ordinary disrepair or the need for improvement will often not be enough.

Outcome

The practical conclusion is as follows:

• If separated spouses are genuinely separated in circumstances likely to be permanent, they may be treated separately for SDLT higher-rate purposes under paragraph 9(3) of Schedule 4ZA.
• But separate treatment does not by itself remove the surcharge. The surcharge can still apply if the actual buyer already owns another dwelling and is not replacing their own main residence.
• If the property is bought in an adult child’s sole name, and the child owns no other property, that is often the most straightforward way to avoid the higher rates.
• A restriction on title may help with control over future dealings, but it should not undermine the child’s genuine ownership if the SDLT position is to rest on the child being the purchaser.

On the facts presented, buying in the adult child’s sole name was the most practical solution and was the route ultimately chosen.

Practical Steps

If you are assessing a similar SDLT position, work through these points carefully:

1. Establish whether the spouses are genuinely separated in circumstances likely to be permanent. Gather clear evidence of separate living arrangements and the permanence of the separation.

2. Identify exactly who will be the purchaser of the new property for SDLT purposes.

3. Check whether that purchaser will own any other dwelling at the end of the effective date of the transaction.

4. Ask whether the purchase is replacing that purchaser’s own only or main residence. If not, the higher rates may still apply.

5. If considering a transfer of existing properties between spouses before the purchase, take advice on the SDLT, CGT and conveyancing consequences of that transfer itself.

6. If considering a trust, decide whether it is intended to be a true bare trust or some other arrangement, and ensure the legal drafting matches the tax analysis.

7. If the property is to be bought in an adult child’s sole name, ensure the legal ownership and beneficial ownership position is coherent and properly documented.

8. If a restriction on title is proposed, ask the conveyancer to explain what protection it gives and what it does not give.

Conclusion

Permanent separation can mean spouses are treated separately for SDLT higher-rate purposes, but that is only the first part of the analysis. The key issue is still whether the actual purchaser already owns another dwelling and whether the new purchase replaces that person’s own main residence. Where parents are helping an adult child, purchase in the child’s sole name is often the simplest SDLT route if the child owns no other property.

Legal References Used

• Finance Act 2003, Schedule 4ZA
• Finance Act 2003, Schedule 4ZA, paragraph 3
• Finance Act 2003, Schedule 4ZA, paragraph 9
• Finance Act 2003, Schedule 4ZA, paragraph 9(3)
• Finance Act 2003, Schedule 4ZA, paragraph 12(2)
• 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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