Selling a property should feel like progress. For many people, it turns into panic weeks after completion. You sell the property. You receive the funds. Then a letter arrives from HMRC.
You missed the 60-day Capital Gains Tax reporting deadline.
This mistake is common, but it is expensive. HMRC data shows over 163,000 UK residential property disposals were reported in 2024–25. Those sales created £10.3 billion in taxable gains. More than £2.2 billion in CGT came from property alone. Late reporting triggers penalties fast, even when no tax is due.
This guide explains the rule, details the financial consequences of missing the date, and lists the specific actions required to limit the damage.
What Is the 60-Day Capital Gains Tax Rule?
If you sell a UK residential property and owe Capital Gains Tax (CGT), you must:
Critical Distinction: The clock starts on the completion day (when you hand over the keys), not the exchange of contracts, and not when the funds clear in your account.
Who Does This Rule Apply To?
- Property Type: UK residential property where the gain is not fully covered by Private Residence Relief (e.g., buy-to-lets, second homes, or homes with partial business use).
- Residency: UK residents.
- Timing: Any sale completed on or after 27 October 2021.
HMRC shortened the deadline from 30 days to 60 days to improve compliance, but they enforce it strictly. There is no grace period.
How Do You Report and Pay Within 60 Days?
You cannot report this on your standard annual Self Assessment tax return initially. You must use HMRC’s standalone “CGT on UK Property” online service.
Required Information:
- A Government Gateway account.
- Property sale details (address, dates).
- Purchase price and sale price.
- Allowable costs (legal fees, stamp duty, capital improvements).
- Any reliefs claimed (like Private Residence Relief).
After submission, HMRC issues a specific payment reference number. You must use this reference when paying via bank transfer or debit card.
Warning: Many solicitors do not handle this reporting. If you assumed your solicitor did it, check immediately. Assumptions cause missed deadlines.
What Happens If You Miss the 60-Day Deadline?
HMRC applies late penalties automatically. These stack on top of each other.
Late Filing Penalties
- £100: Applied immediately if you miss the deadline, even by one day.
- £300 or 5% of tax due: Applied after 6 months.
- £300 or 5% of tax due: Applied after 12 months.
- Note: These apply even if the tax owed is minimal.
Late Payment Penalties
- 5% of unpaid tax: Applied after 30 days.
- 5% of unpaid tax: Applied after 6 months.
- 5% of unpaid tax: Applied after 12 months.
Interest Charges
Interest accrues daily on any unpaid balance. HMRC charges the Bank of England base rate plus 2.5%. As of 2025, that rate sits above 7%.
The Cost of Delay (Example): If you owe £10,000 in CGT and file 7 months late without paying:
- £100 late filing penalty.
- £500 late payment penalty (30 days).
- £500 six-month filing penalty.
- £500 six-month payment penalty.
- Interest on the full balance. Total Extra Cost: Over £1,600 + Interest.
What To Do Immediately If You Miss the Deadline
Speed matters more than excuses. Follow this strict order of operations.
1. File the Return Immediately
Do not wait. Even if you cannot pay the tax yet, file the report. The late filing penalties stop accruing once you submit the form.
2. Pay What You Can
Partial payment reduces the daily interest calculation. HMRC prefers action over silence.
3. Apply for Time to Pay
If cash is tight, request a “Time to Pay” arrangement. HMRC often approves plans under 12 months if you show effort and communicate early. You cannot ignore the debt.
4. Consider an Appeal
HMRC may cancel penalties if you show a “reasonable excuse.”
- Valid Reasons: Serious illness, bereavement, or HMRC system failures.
- Invalid Reasons: Lack of knowledge, relying on a solicitor who forgot, or finding the system difficult.
5. Get Professional Help
Errors compound fast. A specialist can check your reliefs (to lower the tax due), recalculate gains to ensure accuracy, and handle the appeal process to potentially reduce penalties.
Special Situations People Often Miss
Non-residents must report all UK property sales, even if no tax is due. The rules differ significantly from UK residents, but the deadline remains rigid.
Estates and trusts have separate reporting obligations. Executors are responsible for filing on behalf of the estate.
Each sale requires its own report or a consolidated approach depending on timing. Combined reporting often leads to calculation errors regarding the Annual Exempt Amount.
How to Avoid Missing the Deadline Again
Use a simple system to ensure compliance.
- Instruct Clearly: Tell your solicitor explicitly that you will handle CGT reporting or appoint an accountant.
- Register Early: Set up your Government Gateway account weeks before the sale completes.
- Collect Records: Gather purchase receipts and improvement invoices before listing the property.
- Set Reminders: Mark your calendar for “Completion Date + 45 Days” to give yourself a safety buffer.
Frequently Asked Questions (FAQs)
What is the 60-day CGT rule?
You must report and pay CGT within 60 days of completion. This applies to UK residential property sales completed on or after 27 October 2021. Capital Gains Tax Expert prepares and files your return fast to avoid late penalties.
What penalties apply if I miss the 60 days?
HMRC charges an immediate £100 late filing penalty. After six months, expect £300 or 5% of the tax due. Late payment interest also adds up daily. We model your likely penalties and the fastest fix.
How much can late interest add to my bill?
HMRC sets late interest linked to the base rate plus a margin. For a £10,000 unpaid tax bill, interest and penalties can cost thousands. We calculate exact interest and plan payments to cut costs.
Can I get penalties cancelled for a good reason?
Yes. HMRC may remove penalties for a “reasonable excuse,” such as serious illness or system failures. We compile evidence and submit an appeal on your behalf.
What should I do now if I missed the deadline?
File the CGT return immediately. Pay what you can. Ask HMRC for a Time to Pay plan.
Contact Capital Gains Tax Expert for urgent support. We file, negotiate Time to Pay, and reduce exposure.
