Stamp duty: exceptional circumstances and selling your old home late
Exceptional circumstances and late sales
HMRC can allow more than three years to sell an old main home after buying a new one, but only in rare cases.
- The event must be exceptional and unforeseeable.
- It must have prevented the sale, not merely made it harder or less profitable.
- HMRC says you must sell first and apply within 12 months.
Scroll down for the full analysis.
Read the original guidance here:
Stamp duty: exceptional circumstances and selling your old home late
Stamp duty: exceptional circumstances and selling your old home late
If the higher stamp duty charge applied when you bought your new home, selling your old home late does not always end a refund claim.
In limited cases, HMRC may extend the three-year deadline when an unforeseeable exceptional event prevented the sale, you sell as soon as reasonably possible after that barrier ends, and you meet the other conditions. The charge is often described today as the extra 5% you pay on a second home.
What this rule is about
Home moves rarely follow a neat order. You may buy your new home first.
Then you sell the old one. If you owned both at the relevant time, the higher SDLT rates may have applied.
Usually, a sale of the old main home within three years can put that right.
If the conditions are met, the law treats the new home as replacing your main home, which can lead to a repayment of the extra SDLT paid. That is the usual route.
But what if the sale took longer than three years?
Paragraph 3(7A) of Schedule 4ZA gives HMRC a limited power to allow more time. It is not a general safety net.
It does not cover every slow or difficult sale.
What the official source says
The legislation requires an exceptional event that you could not reasonably have foreseen.
That event must have stopped you, or your spouse or civil partner, from selling the old home within the normal three-year period. The test is strict.
HMRC’s manual says exceptional events will be rare. They must sit well outside normal property-selling risks.
It also says you must sell the old home before HMRC will consider the request.
- The new property must have been intended as your only or main home.
- The old property must meet the wider main-home conditions for this route.
- An unforeseeable exceptional event must actually have prevented the sale in time.
- HMRC says you should sell as soon as reasonably possible once that barrier ends.
- The application must be made within 12 months of the sale of the old home.
- HMRC says there is no pre-sale clearance service for this question.
The manual gives government restrictions on property sales, or action by a public body which stops a sale, as possible examples. Those examples point to the kind of outside event HMRC has in mind.
They are not a complete legal list.
By contrast, HMRC says ordinary setbacks do not qualify.
That includes a buyer changing their mind, a broken chain, lack of funds, a falling market, or choosing to wait for a better price. These are normal sales risks.
What this means in practice
This is where people go wrong: a hard sale is not necessarily an exceptional one.
The key question is not whether selling was inconvenient or costly. It is whether an unforeseeable event really stopped the sale within the three years.
Timing matters twice. You need to show when the problem began.
You also need to show when it ended, what prevented a sale during that period, and what you did once you could sell again. Dates matter.
- Keep a clear timeline of the new-home purchase and the old-home sale.
- Keep letters, reports and public-authority notices that explain the barrier.
- Keep estate-agent instructions, listings and sale correspondence.
- Explain why the problem was not reasonably predictable when it mattered.
- Apply only after the old home has been sold.
HMRC’s manual says it may ask for more information.
A bare statement that the market was poor is unlikely to answer the real issue. Documents and dates will matter far more.
How to analyse it
Start with the ordinary replacement-of-main-home test.
The exceptional route does not replace that test. It only extends the time allowed for the sale where the case meets the statutory conditions.
- Did the higher SDLT rates apply when you bought the new home?
- Was the new home intended to be the home you lived in?
- Was the old property your main home during the required period?
- Was it sold after, rather than within, the normal three-year period?
- What specific event stopped a sale before the deadline?
- Could that event reasonably have been foreseen?
- Did the event really prevent the sale, rather than merely make it less attractive?
- Once the barrier ended, did you take reasonable steps to sell?
- Can you make the application within 12 months of the sale?
Ask yourself a blunt question: could the home have been conventionally sold before the deadline but for the event?
If the answer is no, the evidence should show why.
HMRC’s view matters especially here because the statute does not define “exceptional circumstances”, although the manual gives guidance rather than law and the legal test remains the wording in Schedule 4ZA. The statute still governs.
Example
Consider a couple who bought a new main home in January 2020 and paid the higher SDLT rates.
Their old flat had cladding problems. Remedial work and the required EWS1 certificate were delayed until September 2024.
They put the flat on the market straight away. They sold it in October 2024.
HMRC’s manual says this can qualify where the cladding work and certificate delay stopped a conventional sale, were not reasonably foreseeable when the flat was bought, and the couple acted promptly once they could sell. On those facts, it can qualify.
Change one fact and the answer may change.
If a buyer had knowingly bought the flat at a reduced price because it already needed that remedial work, HMRC says the delay was foreseeable. The manual’s example says no repayment is available in that situation.
Another common mistake is waiting for prices to improve.
Even if the market later rises, HMRC says that choice is not an exceptional circumstance. It is a commercial decision.
Why this can be difficult in practice
These cases turn on facts and degree.
An event can be serious without being legally exceptional. An unusual event may also fail to help if enough time remained in the three-year period to sell.
HMRC says a person who leaves little time to market the old home may struggle to show that the exceptional event caused the late sale.
It also says an extension is unlikely where the event ended well before the deadline. The link must be clear.
- A property chain collapsing is upsetting, but HMRC treats it as a normal sales risk.
- Waiting to avoid a loss is not the same as being prevented from selling.
- A shortage of money does not itself make the case exceptional under HMRC’s view.
- Knowing about a serious problem when you bought the old home can make it foreseeable.
- Delays after the barrier has ended can weaken the link between the event and the late sale.
- The facts must be complete before HMRC will consider the application, which is why it expects the sale first.
The manual says HMRC decides whether the circumstances qualify and says there is no right of appeal against a refusal.
That makes the first application important. Set out the dates, the event, its effect on the sale, and the evidence of prompt action clearly.
Key takeaways
- A late sale can still lead to an SDLT repayment in rare cases.
- The event must be unforeseeable and must really have stopped the sale.
- Sell the old home first, then apply within 12 months of that sale.
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 4ZA para 3 — replacement of an only or main residence test; later sale of a previous main home; exceptional circumstances extension to the three-year period; time limit and form for an application; special application is outside ordinary claim rules
- FA 2003 Schedule 4ZA para 8 — effect of HMRC granting an extension application
- an Act of 2020 we do not have an identifier for section 76 — introduced exceptional circumstances extension for later sales (no link: an Act of 2020 we do not have an identifier for)
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
- There is no statutory list of events that are exceptional, so the answer depends heavily on the facts.
- HMRC’s manual says a person should sell as soon as reasonably possible after the barrier ends. That is not a separate express condition in paragraph 3(7A), although timing may be important evidence of whether the event really prevented the sale.
- HMRC says there is no right of appeal against its decision on an exceptional-circumstances extension. The source does not identify a separate statutory appeal route for that decision.
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.
- A timeline from the new-home purchase to the old-home sale
- Proof of the event said to have stopped the sale
- Evidence that the event could not reasonably have been foreseen
- Marketing, estate-agent and sale records after the barrier ended
- Evidence that the old home had been your main home
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 Stamp duty: exceptional circumstances and selling your old home late [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 4ZA para 3 - replacement of an only or main residence test https://www.legislation.gov.uk/ukpga/2003/14/schedule/4ZA/paragraph/3/2025-11-17 - FA 2003 Schedule 4ZA para 3 - later sale of a previous main home https://www.legislation.gov.uk/ukpga/2003/14/schedule/4ZA/paragraph/3/2025-11-17 - FA 2003 Schedule 4ZA para 3 - exceptional circumstances extension to the three-year period https://www.legislation.gov.uk/ukpga/2003/14/schedule/4ZA/paragraph/3/2025-11-17 - FA 2003 Schedule 4ZA para 3 - time limit and form for an application https://www.legislation.gov.uk/ukpga/2003/14/schedule/4ZA/paragraph/3/2025-11-17 - FA 2003 Schedule 4ZA para 3 - special application is outside ordinary claim rules https://www.legislation.gov.uk/ukpga/2003/14/schedule/4ZA/paragraph/3/2025-11-17 - FA 2003 Schedule 4ZA para 8 - effect of HMRC granting an extension application https://www.legislation.gov.uk/ukpga/2003/14/schedule/4ZA/paragraph/8/2025-11-17 - an Act of 2020 we do not have an identifier for section 76 - introduced exceptional circumstances extension for later sales Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm09807 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 - There is no statutory list of events that are exceptional, so the answer depends heavily on the facts. - HMRC's manual says a person should sell as soon as reasonably possible after the barrier ends. That is not a separate express condition in paragraph 3(7A), although timing may be important evidence of whether the event really prevented the sale. - HMRC says there is no right of appeal against its decision on an exceptional-circumstances extension. The source does not identify a separate statutory appeal route for that decision. 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: Stamp duty: exceptional circumstances and selling your old home late
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