Developer part exchange: when the 17% SDLT charge may not apply
In short
A developer that takes a buyer’s old home as part exchange may avoid the 17% SDLT charge. The deal must be a qualifying exchange, and the old home must be held only for resale.
- The 17% charge is not replaced by no tax.
- HMRC says the higher rates for additional homes apply instead.
- A later change of use can trigger a further return and tax payment.
Scroll down for the full analysis.
Read the original guidance here:
Developer part exchange: when the 17% SDLT charge may not apply
Developer part exchange: when the 17% SDLT charge may not apply
A property developer can sometimes avoid the 17% stamp duty charge when taking a buyer’s old home in part exchange. This is not a stamp duty exemption. HMRC says the purchase is instead taxed at the higher rates for additional homes. A narrow set of facts must apply to the deal.
What this rule is about
Part exchange often means a developer sells a new home and takes the buyer’s old home as part of the bargain. After that, the developer plans to sell the old home on. This can be a practical way to keep the buyer’s purchase moving.
For some company and similar buyers, a high-value home can otherwise face SDLT at 17%. That is a large amount. Qualifying part exchange can disapply that charge.
This is the part people get wrong: calling a deal “part exchange” is not enough.
What the official source says
HMRC’s manual says that the 17% charge does not apply where a property developer takes a single home only for resale in its property development trade, and the deal is part of a qualifying exchange. Underlying conditions are set by the law.
- The developer must acquire the returned home solely for resale through its property development trade.
- That trade must include buying and developing or redeveloping property for resale.
- It must be run commercially and with a view to profit.
- The developer must receive the returned home by transfer, not by the grant of a lease.
- The seller must receive a new home from the developer by transfer or lease.
- The two linked deals must each be entered into in return for the other.
- The new home must be newly built and never lived in, or newly adapted and not lived in since the work ended.
People sometimes call the developer’s purchase of the old home the reverse purchase. The old home itself is sometimes called the returned interest. Neither label decides the answer.
What this means in practice
When every condition is met, the 17% charge is removed from the developer’s purchase of the returned home. HMRC’s manual says the higher rates for additional homes apply instead. There can therefore still be a substantial SDLT bill.
A three-year watch period also applies to the relief. Having the right plan on completion day is not enough.
- Keep clear evidence that resale was the only intended purpose.
- Put the old home on the market promptly where that fits the commercial plan.
- Buyer-connected people may not occupy homes on the land.
- Keep checking the conditions for three years after the effective date.
- If the relief is withdrawn, file a further SDLT return and pay the extra tax within 30 days of the relevant date.
Limited protection is available where an unforeseen change outside the buyer’s control makes it unreasonable to expect the original purpose to continue. Careful records are still needed for the facts.
How to analyse it
Begin with the documents and the real commercial arrangement. Do not start with the estate agent’s description of the deal.
- Check whether the buyer is a company or other buyer within the 17% rule.
- Check the value and the type of home interest being bought.
- Identify the developer’s property development trade and its normal business activity.
- Read both sides of the part-exchange arrangement together.
- Check that the developer receives the old home by transfer.
- Check that the other person receives a qualifying new home from the developer.
- Ask whether each deal was agreed because of the other one.
- Check the developer’s actual resale plans and later actions.
- Monitor use and occupation during the three-year period.
Example
Amir buys a newly built home from Greenfield Homes Ltd. As part of the same bargain, Greenfield takes Amir’s old home by transfer and plans to sell it as stock in its development business. The old home is worth £600,000. If the 17% charge applied, that charge alone would be £102,000.
When the linked documents show a qualifying exchange and Greenfield bought the old home only to resell it, the 17% charge does not apply. HMRC’s manual says the higher rates for additional homes apply instead. Exact SDLT depends on effective-date rates.
Why this can be difficult in practice
Often, the key question is simple to ask but hard to prove: were the two deals really given in return for each other? Separate contracts and different completion dates do not automatically prevent that result. They can, however, make the evidence more important.
Purpose matters too. A developer may expect to sell the returned home quickly, then change plans when the market moves. Relief does not automatically end in that situation. The reason for the change, and the steps taken afterwards, may matter.
- A part-exchange label does not prove a qualifying exchange.
- A lease of the returned home does not meet the transfer requirement.
- A post-adaptation lived-in home is not new.
- Using the returned home for a connected person can cause the relief to be withdrawn.
- Ignoring the three-year conditions can create a later SDLT bill.
Key takeaways
- A genuine developer part exchange can remove the 17% SDLT charge.
- The returned home must be bought only for resale in a qualifying development trade.
- Keep evidence of the linked deal and review the conditions for three years.
Technical analysis
For advisers, and for anyone who wants to check the law behind this page. You do not need this section to understand the guidance above.
Legislation
- FA 2003 Schedule 4A para 1 — when a home interest crosses the value threshold
- FA 2003 Schedule 4A para 3 — the 17% charge for certain company buyers
- FA 2003 Schedule 4A para 5 — relief for qualifying property business purchases
- FA 2003 Schedule 4A para 5A — people treated as connected to the buyer
- FA 2003 Schedule 4A para 5G — three-year conditions after this relief is given
- FA 2003 section 81 — later return and payment when relief is withdrawn
- FA 2013 section 139 — meaning of a qualifying part-exchange arrangement
Official guidance
The pages below are HMRC’s guidance. Guidance is not law. It sets out how HMRC reads the legislation, and it is not binding on you, on a tribunal or on a court. Where guidance and the legislation differ, the legislation wins. HMRC can also change or withdraw guidance, and it may not cover your facts.
Where this is not settled
- Whether linked deals were truly entered into in return for each other can depend on the contracts, negotiations and timing.
- Whether the buyer acquired the old home exclusively for resale depends on its real plans and later conduct.
- The applicable SDLT rates and any legislative changes must be checked against the effective date.
Evidence you would need
This kind of case is decided on the facts of the individual property. These are the records that usually settle it, and the ones an adviser would ask you for.
- Signed part-exchange agreement: shows that each side agreed to give something in return for the other deal.
- Sale and transfer deeds for both homes: show who transferred each home and whether the developer received the old home by transfer.
- Completion statements and dated payment records: show the timing and financial links between the two deals.
- Contract for the buyer’s new home: shows whether it was newly built or newly adapted and was supplied by the developer.
- Build records, completion certificates and photographs: help show when construction or adaptation finished.
- Occupation records for the new home: show whether anybody lived there before the work was complete.
- Company accounts, business plan and stock records: show that the buyer runs a commercial property development trade for profit.
- Marketing instructions, estate-agent listing and sale file: show that the returned home was held only for resale.
- Board minutes and internal emails made at the time: show the purpose for buying the returned home.
- Tenancy, licence and occupation records for three years: show whether a connected person was allowed to live there.
Explore this with an AI
Readers often want to test their own situation. Copy the prompt below into ChatGPT, Claude or Gemini. It hands the model the actual legislation for this page rather than letting it answer from memory, and tells it to be explicit about what is uncertain. What comes back is information, not advice – check it against the links above.
I am researching UK Stamp Duty Land Tax (SDLT), which applies in England and Northern Ireland. MY QUESTION Developer part exchange: when the 17% SDLT charge may not apply [Replace this with your own situation: what you are buying, the price, the dates, who the buyer is, and what you plan to do with the property.] THE LAW THIS TURNS ON - FA 2003 Schedule 4A para 1 - when a home interest crosses the value threshold https://www.legislation.gov.uk/ukpga/2003/14/schedule/4A/paragraph/1/2025-11-17 - FA 2003 Schedule 4A para 3 - the 17% charge for certain company buyers https://www.legislation.gov.uk/ukpga/2003/14/schedule/4A/paragraph/3/2025-11-17 - FA 2003 Schedule 4A para 5 - relief for qualifying property business purchases https://www.legislation.gov.uk/ukpga/2003/14/schedule/4A/paragraph/5/2025-11-17 - FA 2003 Schedule 4A para 5A - people treated as connected to the buyer https://www.legislation.gov.uk/ukpga/2003/14/schedule/4A/paragraph/5A/2025-11-17 - FA 2003 Schedule 4A para 5G - three-year conditions after this relief is given https://www.legislation.gov.uk/ukpga/2003/14/schedule/4A/paragraph/5G/2025-11-17 - FA 2003 section 81 - later return and payment when relief is withdrawn https://www.legislation.gov.uk/ukpga/2003/14/section/81/2025-11-17 - FA 2013 section 139 - meaning of a qualifying part-exchange arrangement https://www.legislation.gov.uk/ukpga/2013/29/section/139 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm09565 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. Guidance from HMRC is its view of the law, not the law, and does not bind a tribunal or a court. 2. Tell me what the rule actually requires, in plain English. 3. Tell me which facts decide the answer, and which facts would change it. 4. Tell me what evidence I would need to support the position. 5. Be explicit about anything unsettled or fact-sensitive. Do not guess. 6. Your training data has a cutoff and SDLT rates and reliefs change at fiscal events. Say so if you are not sure the law is current. POINTS ALREADY KNOWN TO BE UNCERTAIN ON THIS TOPIC - Whether linked deals were truly entered into in return for each other can depend on the contracts, negotiations and timing. - Whether the buyer acquired the old home exclusively for resale depends on its real plans and later conduct. - The applicable SDLT rates and any legislative changes must be checked against the effective date. Do not give me a conclusion you cannot support from the provisions above.
Legislation links show Finance Act 2003 as it stood on 2025-11-17. The law may have changed since, and the rules that apply are those in force on the date of your transaction. The official guidance this page is based on is here.
This page was last updated on 31 August 2026
Useful article? You may find it helpful to read the original guidance here: Developer part exchange: when the 17% SDLT charge may not apply
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