Do Crown Servants pay higher SDLT when buying a UK home if they already own another flat?

Introduction

A common SDLT question is whether someone working overseas for the UK government can buy a home in the UK without paying the higher rates for additional dwellings. The issue often arises where that person already owns a flat or house, perhaps one they used to live in but now let out.

The answer usually turns on two points: whether the buyer will own more than one dwelling at the end of the purchase, and whether the new property is replacing their only or main residence. Crown Servant status does not by itself switch off the higher rates rules.

The Question

A UK Crown Servant posted overseas jointly owns a flat in London with another person under a trust arrangement. The flat was previously their home but is now rented out. They now want to buy another residential property in the UK with their future spouse. The future spouse would otherwise qualify as a first-time buyer. The new property may also be let for a period before the couple return to live in it. The question is whether the purchase will attract the higher rates of SDLT because the buyer still owns the London flat, and whether the extra charge is 10%.

Nick’s Explanation

Nick’s core view was that the higher rates would normally apply if the buyer still owns the original flat at completion and is not replacing their only or main residence.

In anonymised form, his explanation was:

“The higher rates rules look at whether you will own more than one dwelling at the end of the transaction and whether the new purchase is a replacement of your only or main residence. Because you still own the existing flat and intend to retain it, the proposed purchase would not be a replacement of your main residence. On that basis, the higher rates would normally apply.”

He also clarified that the surcharge itself is not 10%:

“The applicable surcharge is 5% on top of the standard residential SDLT rates, not 10%. The 10% figure is likely the total effective rate in a particular price band, rather than a standalone surcharge.”

Nick further noted that if the former main residence is disposed of within the relevant time limit, a refund of the higher rates may be available, provided the statutory conditions are met.

The Law

SDLT is charged on land transactions under section 42 of the Finance Act 2003. A land transaction includes the acquisition of a chargeable interest under section 43 of the same Act.

The higher rates for additional dwellings are contained in Schedule 4ZA to the Finance Act 2003. In broad terms, 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 dwelling is not a replacement for the purchaser’s only or main residence.

Where the rules apply, the SDLT charged is the normal residential SDLT plus the additional dwelling supplement. In the scenario described, the relevant extra charge is 5% on top of the standard residential rates.

Schedule 4ZA also contains the refund mechanism where a buyer purchases a new home before disposing of their previous only or main residence. Broadly, if the previous main residence is disposed of within three years of the new purchase, the buyer may reclaim the additional SDLT paid, subject to the statutory conditions and time limits for making the claim.

Where a property is transferred to a connected company, section 53 of the Finance Act 2003 can deem the chargeable consideration to be market value.

First-time buyer relief is not available on a joint purchase unless all purchasers satisfy the qualifying conditions.

Analysis

The SDLT position can be worked through in stages.

First, the proposed purchase of a UK residential property is a chargeable land transaction. So SDLT must be considered in the normal way.

Second, the buyer already owns a major interest in another dwelling: the existing London flat. It does not matter that the flat is jointly owned. Joint ownership can still amount to owning a major interest for Schedule 4ZA purposes.

Third, the fact that the buyer once lived in that flat does not by itself prevent the higher rates from applying. The key question is whether the new purchase replaces the buyer’s only or main residence. If the existing flat is being kept, rather than sold or otherwise disposed of, the new purchase will usually not count as a replacement.

Fourth, being a Crown Servant posted abroad does not create a general exemption from the additional dwelling rules. The legislation focuses on property ownership and replacement of a main residence, not simply on employment status or overseas posting.

Fifth, the intended short-term letting of the new property before moving back does not usually help with the higher rates analysis. The issue is still whether, at completion, the buyer owns another dwelling and whether the transaction is replacing a main residence.

Sixth, the future spouse’s first-time buyer status does not rescue the transaction if the purchase is made jointly and the other buyer already owns residential property. First-time buyer relief is tested by reference to all purchasers. If one buyer fails the conditions, the relief is not available.

Seventh, the 10% figure can be misleading. In SDLT discussions, people sometimes confuse:

• the additional 5% surcharge, and
• the total SDLT rate that may apply to a slice of the purchase price once the surcharge is added to the ordinary residential rates.

So the extra charge is 5%, but the combined rate on part of the price may be higher than that.

Eighth, if the buyer later disposes of the former main residence within three years, a refund of the higher rates on the new purchase may be available. Whether a particular disposal qualifies depends on the detailed facts and the statutory rules.

Ninth, transferring the old flat into a company may count as a disposal for SDLT purposes, but that does not make it automatically tax-efficient. A company acquisition of the property can itself trigger SDLT, often by reference to market value under section 53 where connected party rules apply. Other taxes may also need consideration. That means this route requires careful review before any step is taken.

Tenth, if anyone is considering arguing that an existing property should be ignored because it is uninhabitable or 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, dated condition, or a need for renovation may not be enough.

Outcome

On the facts described, the purchase would normally be subject to the higher rates of SDLT.

That is because the buyer still owns another dwelling and is not replacing their only or main residence at the time of the new purchase.

The extra charge is generally 5% above the standard residential SDLT rates, not a separate 10% surcharge.

The future spouse’s first-time buyer status would not secure first-time buyer relief on a joint purchase if the other buyer already owns a dwelling.

Practical Steps

If you are in a similar position, the sensible steps are:

• confirm exactly who will buy the new property and in what shares;
• check whether any buyer already owns a major interest in another dwelling anywhere in the world;
• decide whether the existing property will be retained or disposed of;
• review whether the new purchase genuinely replaces a previous only or main residence;
• calculate SDLT using standard residential rates plus the 5% supplement if Schedule 4ZA applies;
• if planning to dispose of the former main residence later, note the three-year deadline and the claim deadline for any refund;
• if considering a transfer to a company, review the SDLT market value rules and any wider tax consequences before acting;
• do not assume first-time buyer relief applies on a joint purchase just because one buyer has never owned property before.

Conclusion

A Crown Servant buying a UK property while still owning a former home that is now let will usually face the higher rates of SDLT unless the new purchase is replacing their only or main residence. In this type of case, the key point is not overseas posting status but continued ownership of another dwelling at completion.

Legal References Used

• Finance Act 2003, section 42
• Finance Act 2003, section 43
• Finance Act 2003, section 53
• Finance Act 2003, Schedule 4ZA
• 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.

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