Can you get an SDLT refund if your old home became a buy-to-let before you transferred it?

Introduction

A common SDLT question is whether the higher rates paid on a replacement home can be reclaimed when the old home was no longer being lived in at the time of the new purchase. This often happens where someone moves out of their first home, lets it out, then later buys a new main residence while still owning the old property.

Another related question is whether the old property has to be sold in the ordinary sense, or whether a transfer or gift can still count as a disposal for the SDLT refund rules. A further issue is whether SDLT is payable on the transfer itself if the person receiving the property takes over the mortgage.

The Question

The scenario was this. A buyer purchased a first home, lived in it as their main residence, then later moved out and began renting it out. Some time afterwards, the buyer and their spouse purchased a new home together. Because the buyer still owned the first property at that point, the higher rates of SDLT applied to the new purchase.

The question was whether the buyer could later obtain a refund of the higher rates if the first property was transferred to a family member within the three-year period after the new purchase. It was also asked whether the transfer had to be a sale, and whether SDLT would be payable on the transfer if no cash changed hands but the family member took over the mortgage.

Nick’s Explanation

Nick’s reasoning was that the refund rules in Finance Act 2003, Schedule 4ZA, focus on whether there has been a disposal of the former main residence within the permitted time limit. The legislation does not require a market sale for cash. A complete transfer of ownership can still be a disposal.

In anonymised form, his explanation was:

“The legislation requires a disposal of the previous main residence within three years of buying the new property. It does not require that disposal to be a sale for money. A complete transfer of ownership, even if made as a gift or for no consideration, can still count as a disposal.”

He also explained that the old property does not need to have been the buyer’s current main residence on the date of the new purchase. What matters is that it was their only or main residence at some point before the new purchase.

On the later SDLT point, Nick explained that a pure gift with no consideration would normally be exempt. But if the recipient takes over liability for an existing mortgage, that assumed debt counts as chargeable consideration for SDLT purposes.

The Law

The relevant legislation is in Finance Act 2003.

For the refund of higher rates on replacement of a main residence, the key provisions are in Schedule 4ZA. In broad terms:

• higher rates can apply where, at the end of the day of the new purchase, the buyer owns another dwelling;
• a refund may be available if the buyer later disposes of their previous only or main residence within the statutory time limit;
• the test is based on disposal of the previous residence, not necessarily a conventional sale.

For whether SDLT is payable on the transfer of the old property itself, the main provisions are:

• Finance Act 2003, section 49, which identifies chargeable land transactions;
• Finance Act 2003, section 50, which provides that SDLT is charged by reference to chargeable consideration;
• Finance Act 2003, Schedule 3 paragraph 1, which exempts transactions with no chargeable consideration;
• Finance Act 2003, Schedule 4, under which assumption of debt, including mortgage debt, can count as chargeable consideration.

Analysis

There are really two separate SDLT questions here.

First, can the buyer reclaim the higher rates paid on the new home?

1. The buyer lived in the first property as their main residence.
2. They later moved out and let it as a buy-to-let.
3. They then bought a new home while still owning the first property, so the higher rates applied at that time.
4. If they later dispose of the first property within three years of the new purchase, they may qualify for a refund of the higher rates, provided the other Schedule 4ZA conditions are met.

The important point is that the old property can still be the “previous main residence” even though it had become a rental property by the time the new home was bought. The legislation does not require the old property to be occupied as the main residence on the exact date of the new purchase.

It also follows that a full transfer of the old property to another person can satisfy the disposal requirement. A sale is the most common example, but it is not the only one.

Secondly, is SDLT payable on the transfer of the old property to the family member?

1. If the property is transferred as a pure gift and the recipient gives nothing in return, there is generally no chargeable consideration.
2. Where there is no chargeable consideration, Schedule 3 paragraph 1 can exempt the transaction from SDLT.
3. However, if the recipient takes over the mortgage, that assumed mortgage debt is treated as chargeable consideration.
4. SDLT is then calculated on the amount of debt taken on, not on the full market value of the property.

So if the mortgage balance being taken over is £145,000, the chargeable consideration is £145,000. Whether any SDLT is actually payable depends on the residential rates in force at the effective date of that transfer and whether any higher rates apply to the recipient.

If the recipient already owns another dwelling and is not replacing their own only or main residence, the higher rates may need to be considered for that transfer as well. If the recipient does not trigger higher rates, then the standard residential rates would usually apply to the £145,000 consideration figure.

Readers should therefore keep the two transactions separate:

• the buyer’s refund claim on the later disposal of the former main residence; and
• the recipient’s own SDLT position on taking the property subject to the mortgage.

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

Outcome

On the facts described, the buyer may be able to reclaim the higher rates of SDLT paid on the new home if the former main residence is fully transferred within three years of the new purchase date and the other Schedule 4ZA conditions are met.

The fact that the old property had become a buy-to-let before the new home was bought does not, by itself, prevent a refund claim.

The disposal does not have to be a sale for cash. A full transfer can be enough.

However, if the recipient takes over the mortgage, that transfer is likely to involve chargeable consideration for SDLT purposes, and SDLT may be payable by reference to the mortgage debt assumed.

Practical Steps

1. Check the completion date of the new home purchase and calculate the exact three-year deadline for disposing of the former main residence.
2. Confirm that the old property was genuinely the buyer’s only or main residence at some point before the new purchase. Keep evidence such as council tax records, electoral roll entries, utility bills, and correspondence.
3. Ensure the transfer is a full disposal of the buyer’s ownership interest, properly documented and completed.
4. Check whether the recipient will take over any mortgage liability. If so, identify the exact outstanding mortgage balance at the effective date of transfer.
5. Calculate the recipient’s SDLT position by reference to the mortgage debt assumed and their own property ownership status.
6. After the disposal completes, submit the higher rates refund claim within the applicable HMRC time limit.
7. If there is any uncertainty about beneficial ownership, mortgage assumption, or whether higher rates apply to the recipient, obtain transaction-specific SDLT advice before completion.

Conclusion

A former home can still count for the SDLT replacement rules even if it was being let out when the new home was bought. A full transfer can count as a disposal for refund purposes; it does not have to be an ordinary sale. But if the person receiving the property takes over the mortgage, that mortgage debt is usually treated as consideration and can create a separate SDLT charge on the transfer itself.

Legal References Used

• Finance Act 2003, section 49
• Finance Act 2003, section 50
• Finance Act 2003, Schedule 3 paragraph 1
• Finance Act 2003, Schedule 4
• Finance Act 2003, Schedule 4ZA
• 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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