Who can submit an SDLT1 return for a part sale of a commercial property?

Introduction

People often search for help with an SDLT1 return after selling or transferring part of a UK property interest. This is especially common where the property is commercial, there are multiple title numbers, or one of the parties is based overseas. A frequent practical question is not about the tax calculation itself, but about who can actually prepare and submit the return.

The Question

A property owner based outside the UK sold a 25% share in a commercial building in England to their pension arrangement for consideration of £172,500. Completion took place in late 2024. The property had two registered titles. The owner wanted to know how to complete an SDLT1 return and whether professional help would be needed to file it.

Nick’s Explanation

Nick’s main point was practical. In an anonymised form, his answer was that if a conveyancing solicitor acted on the transaction, that firm would usually be able to deal with the SDLT filing as the tax agent. He explained, in substance, that:

“If a conveyancing solicitor assisted with the transaction, they would normally be registered as a tax agent and could submit the SDLT1 on your behalf.”

He also noted that if the original conveyancer was not handling the filing, a specialist SDLT adviser could be instructed instead.

The key message is that an SDLT1 return is usually submitted either by the conveyancer dealing with completion or by a tax adviser who has the necessary HMRC agent access and enough information about the transaction to complete the form correctly.

The Law

Stamp Duty Land Tax is charged under the Finance Act 2003 on land transactions involving property in England and Northern Ireland. In broad terms, SDLT applies where there is a chargeable transaction and chargeable consideration.

For a transfer of a chargeable interest in a commercial property, the buyer is generally responsible for the SDLT return and any SDLT due. The filing obligation is governed by the Finance Act 2003 and HMRC’s SDLT administration rules. A land transaction return is normally required unless the transaction falls within a specific exception.

Where there are multiple title numbers, that does not usually mean multiple SDLT returns are needed. If the transaction is a single land transaction completed at the same time between the same parties, the return can usually include all relevant titles. The titles are part of describing the property interest transferred; they do not automatically create separate tax charges.

The fact that one party is overseas does not remove the SDLT reporting obligation if the land is in England or Northern Ireland. What matters is the location of the land and the nature of the transaction.

Analysis

There are several practical points to work through.

First, this appears to be a transfer of a partial interest in a commercial property. That is capable of being a chargeable land transaction for SDLT purposes.

Second, the consideration stated was £172,500. For non-residential or mixed property, the SDLT treatment depends on the rates and thresholds in force on the effective date of the transaction. The effective date is usually completion, unless substantial performance happened earlier.

Third, because the transaction involved a sale to a pension arrangement connected with the owner, it is sensible to check whether any special valuation or connected-party issues arise. In some cases, market value rules can apply. That is a technical point and should be reviewed carefully from the transfer documents and the relationship between the parties.

Fourth, the existence of two title deeds or title numbers is mainly a conveyancing and form-completion issue. It does not usually make the SDLT analysis fundamentally different. The return must simply identify the land interests transferred accurately.

Fifth, the person who normally files the SDLT1 is the buyer’s conveyancer or tax agent. In practice, if solicitors handled the transfer, they are often best placed to submit the return because they already hold the transfer deed, title details, completion statement and client identification information. If no conveyancer is filing, a specialist SDLT adviser can usually assist.

Finally, timing matters. SDLT returns must be filed within the statutory deadline after the effective date of the transaction. Missing the deadline can lead to penalties and interest if tax is due.

Outcome

The practical answer is that the first person to ask is the conveyancing solicitor who dealt with the transaction. They will usually be able to submit the SDLT1 return as agent. If they are not doing so, a specialist SDLT adviser can prepare and file the return instead.

The fact that the property had two titles does not, by itself, prevent filing or make the return unusually complex. It simply means the title details need to be entered correctly. The more important issue is making sure the transaction has been analysed properly, including whether the consideration figure is the correct SDLT base and whether any connected-party or market value rule needs to be considered.

Practical Steps

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

• Check who acted on the conveyancing and ask whether they will submit the SDLT1.
• Gather the transfer deed, contract, completion statement and Land Registry title numbers.
• Confirm the effective date of the transaction, usually the completion date.
• Check whether the buyer is the party responsible for filing and paying any SDLT.
• Review whether the parties are connected, so that any market value rule can be considered.
• Make sure the property is correctly classified as non-residential or mixed, if relevant.
• Ensure the return is filed within the statutory deadline.

Conclusion

For a part sale of a commercial property, the SDLT1 return is usually filed by the conveyancing solicitor or another authorised tax agent. Multiple title numbers do not usually require a different approach, but the transaction details must be entered carefully. Where the transfer is between connected parties or involves a pension structure, it is worth checking the SDLT position in detail before filing.

Legal References Used

• Finance Act 2003
• HMRC Stamp Duty Land Tax guidance and SDLT return administration rules

This page was last updated on 22 March 2026.

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