Introduction
Most UK homeowners think they won’t pay tax when they sell their home, and in most cases, they’re right because private residence relief covers the profit you make. Things change when you rent out your property.
When you move out or start renting your property, HMRC views it differently. The time you lived there remains tax-free, but the period you rent it out might not be. The rules changed in April 2020, and the ‘final exemption period’ dropped from 18 months to 9 months while HMRC also made letting relief much harder to claim.
You need to know these new rules if you rent your home now or plan to do so, and this guide shows you which reliefs still work and helps you avoid expensive mistakes.
What Is Private Residence Relief?
Private residence relief (PRR) removes Capital Gains Tax when you sell your main home. You can find this relief in sections 222 to 226 of the Taxation of Chargeable Gains Act 1992.
How Does It Work?
HMRC looks at your total profit and checks all the years you owned the property to work out how much time you lived there versus how much time you rented it out. Here’s an example: if you lived in the property the whole time you owned it, you pay zero tax because the relief covers 100% of your gain.
But if you rented your home for part of that time, only the lived-in period counts as exempt, plus some grace periods, and you pay tax on the rental period.
What Counts as Your Main Residence?
HMRC doesn’t give relief just because you own a property – you must have lived there as your home.
HMRC checks the ‘quality of occupation’ by looking at several things:
- Daily habits: Did you cook, eat, and sleep there often?
- Bills and admin: Do you have utility bills, voter registration, and bank statements at that address?
- Social ties: Did you register with a GP there, and is it your driving license address?
- Intent: Can you show you meant to make it your permanent home?
You don’t need to live there for a minimum time, but you must show you lived there on a permanent and continuous basis.
How Do the Rules Work for Couples?
Married couples and civil partners can claim only one main residence between them, so if you each own property, you need to choose which one is your joint main residence. After you separate, each person can claim relief on their own property.
What Is Deemed Occupation? (Temporary Absences)
Life happens, and HMRC knows this, so some absences still count as ‘deemed occupation’ which protects your relief if the property was your main residence before and after the absence.
- Any reason: Up to 3 years total
- Employment abroad: No limit if you work outside the UK
- Work-related distance: Up to 4 years if your workplace prevents you living at home
What If You Own Two Properties?
If you own more than one residence, you can choose which one gets the relief by telling HMRC in writing within two years of buying the second property. This is powerful for tax planning because you can protect the property most likely to grow in value.
How Does Renting Out Your Home Affect CGT?
When you move from living in a property to renting it out, you change its tax status, and what was once a simple family home becomes a mixed-use asset in HMRC’s eyes.
Can You Rent Out Your First Home?
Many people rent out their first home when they move to a larger property because it’s a natural step on the property ladder. The years you lived there stay protected by PRR, but the rental period becomes taxable, except for the final 9 months.
Key question: Can you rent out your first home in the UK?
Yes, you can, but you must prepare for tax when you sell because the longer you rent it out, the more tax you pay.
For example, say you lived there for 5 years and rented it for 10 years – only about 37% of your gain would be tax-free, including the 9-month final period, and you pay tax on the remaining 63%.
What Is the Real Tax Impact?
The cost of renting out your home isn’t just maintenance and management fees – there’s a hidden ‘tax leak’ when you sell. Every month beyond the 9-month grace period reduces your tax-free gain while your property sits in the rental market, and each month counts. Properties in high-growth areas like London or the Southeast can mean tens of thousands in extra tax.
Here’s an example: a £200,000 gain with 60% taxable becomes £120,000 subject to CGT, and for a higher-rate taxpayer, that’s £28,800 in tax.
What Are the Different Scenarios?
- Renting out your first home: You get proportional relief based on lived-in years versus let years.
- Renting your second home: This is taxable unless you nominated it at the right time.
- Buying another home while renting the first: Your new home becomes your main residence. Your old home accrues CGT.
- Renting out part of your home (lodger): You get PRR on your portion. You may get letting relief on the let portion.
What About Your Mortgage?
Important: Most residential mortgages need ‘consent to let’ from your lender before you can rent your property out. Some lenders charge a fee or raise your interest rate, and if you rent without permission, you breach your mortgage terms and create serious financial problems.
When Does the Clock Start?
Your CGT exposure begins when your property stops being your main residence, which happens when you move out on a permanent basis, not when you find a tenant. If the property sits empty while you search for tenants, that vacant period counts as ‘not your main residence’ unless it falls within the final 9 months of ownership.
How Does the Final 9-Month Rule Work?
The ‘final period of exemption’ protects homeowners who’ve moved out but haven’t sold yet, and you get deemed occupation for the final period regardless of how you used the property during that time.
How Did the Rule Change?
The rules have changed over time:
- Pre-2014: 36 months (3 years)
- April 2020 onwards: 9 months (standard)
- 2014-2020: 18 months
- Exception: Disabled persons or those in long-term care still get 36 months.
What’s a Common Mistake?
The 9-month rule doesn’t ‘reset’ if you move back in – it looks back from the completion date and grants relief for that final window only.
Is Letting Relief Still Available?
Before April 2020, letting relief could exempt up to £40,000 of gain per person, which was a major tax-saver for landlords, but that’s changed.
What Relief Is Left?
Letting relief now works only if you and your tenant lived in the property at the same time, so if you moved out and let the whole property, you don’t qualify. The only exception is if you live in the property and rent out a part, like a lodger or basement flat, where your part gets PRR and the let part may qualify for letting relief.
Can You Claim Both PRR and Letting Relief?
Yes, but only with shared living arrangements. You cannot claim relief for periods when you lived elsewhere while the property was let in full.
How Do You Calculate Private Residence Relief?
You need precision to calculate CGT with PRR, and it follows a clear process – here’s the four-step method.
Step 1: How Do You Calculate Total Gain?
Start with the basics: sale price minus purchase price minus buying and selling costs, where buying costs include solicitor fees, stamp duty, and survey costs, while selling costs include estate agent fees, legal fees, and EPC certificates.
For example, you bought for £200,000, plus £8,000 costs, and you sold for £400,000, minus £10,000 costs. Your gross gain equals £400,000 minus £200,000, which is £200,000, and your net gain after costs is £200,000 minus £8,000 minus £10,000, which equals £182,000.
Step 2: What Can You Deduct?
Subtract qualifying capital improvements, which are works that increased the property’s value on a permanent basis.
- Allowed: Extensions, loft conversions, new roof, new central heating system
- Not allowed: Redecorating, repairs, routine maintenance, furniture
If you spent £20,000 on a kitchen extension, your gain drops to £162,000.
Step 3: How Do You Apply Time Apportionment?
This is where PRR comes in – work out what portion of time the property was your main residence. Let’s use an example timeline. Say you owned the property from January 2015 to January 2025 (120 months total). You lived there from January 2015 to December 2020 (72 months). You rented it out from January 2021 to January 2025 (48 months). The final period exemption covers the last 9 months (April 2024 to January 2025).
Here’s the calculation. Your time as main residence was 72 months. Plus the final exemption of 9 months gives you a total exempt period of 81 months. The fraction is 81 divided by 120, which equals 67.5%. Your exempt gain is £162,000 multiplied by 67.5%, which equals £109,350. Your taxable gain is £162,000 minus £109,350, which equals £52,650.
Step 4: How Do You Calculate Tax Due?
Deduct your Annual Exempt Amount of £3,000 for 2024/25 and 2025/26. Your remaining chargeable gain is £52,650 minus £3,000, which equals £49,650.
Apply the right CGT rate:
- Basic rate: 18%
- Higher rate: 24%
- Additional rate: 24%
If you’re a higher-rate taxpayer, the calculation is £49,650 multiplied by 24%, which equals £11,916 CGT due.
Joint ownership note: if you own the property in a joint capacity, each owner calculates on a separate basis. Each can use their own £3,000 allowance, which could save £1,440 in this example.
What About Complex Occupation Patterns?
If you moved back into the property during ownership, you create multiple ‘residence periods’ where each period counts toward your exempt time, which makes the calculation more complex but could save you tax.
How Do You Report to HMRC?
One of the biggest changes in recent years catches property sellers off guard because you can no longer wait until your annual Self-Assessment to report and pay CGT on property sales. UK residents must report residential property sales with CGT due within 60 days of completion, and this rule started in April 2020 before extending to 60 days in October 2021 – miss this deadline and penalties apply.
How Do You File the Report?
File through HMRC’s ‘Capital Gains Tax on UK Property‘ online service.
You’ll need:
- Details of the property sold
- Completion date
- Sale proceeds and costs
- Your calculation of the gain
- An estimate of tax due
Pay the tax when you submit the report because HMRC won’t send you a bill – you calculate, report, and pay within 60 days.
What About Self-Assessment?
Once you filed your 60-day return, you must still declare the same sale on your annual Self-Assessment tax return if you complete one, where the 60-day payment counts as ‘payment on account’ toward your final bill. When you complete your tax return, HMRC recalculates your total tax position, and you may get a small refund or owe a bit more depending on your other income and gains for the year.
What Are the Penalties?
The penalty system is strict:
- Day 1 late: £100 penalty with no exceptions
- 3 months late: Extra penalties of 5% of tax due or £300, whichever is higher
- 6 months late: Another 5% penalty
- 12 months late: Further 5% penalty plus possible investigation
Interest builds on unpaid tax from the original deadline and compounds each day.
Real scenario: a client once missed the deadline by just 5 days while waiting for documents from their solicitor, where the tax due was £8,000 and the result was a £100 penalty plus interest.
How Can You Avoid Last-Minute Panic?
Start preparation at an early stage:
- Request completion statements from your solicitor right after the sale
- Gather all purchase documents within the first month
- Collect improvement receipts from your files
- Calculate the gain by week 6
- File and pay by day 55 at the latest
Don’t wait until day 59 because system glitches, bank transfer delays, or missing information can wreck your deadline.
What Evidence Does HMRC Request?
HMRC uses its ‘Connect’ system to spot questionable claims where they look for genuine residence, not just property ownership.
How Do You Prove You Lived There?
Be ready to provide:
- Utility records: Gas and electricity bills showing use that matches occupation
- Correspondence: Bank statements and GP letters sent to that address
- Official records: DVLA records and electoral roll entry
What Raises Red Flags?
Frequent ‘flipping’ of properties raises major red flags because if you buy, renovate, and sell within a short time, HMRC may argue this is a ‘trading activity’ rather than a capital investment, which subjects your profits to Income Tax up to 45% and National Insurance, not the lower CGT rates.
What Tax Strategies Should You Consider?
Smart planning before you rent or sell can save you thousands, so here are some strategies worth considering.
Should You Move Back In Before Selling?
If you’ve rented out your former home, consider moving back in before you sell because any period when the property is your main residence again qualifies for PRR, which reduces your taxable gain.
Example: you lived in a property for 5 years, rented it for 8 years, then moved back for 2 years before selling, where those final 2 years, plus the 9-month exemption, are tax-free. The math: 5 + 2 + 0.75 = 7.75 years tax-free out of 15 years total, which gives you over 51% relief instead of just 37%.
How Should You Nominate?
If you own two properties, choose your nomination with care by nominating the property most likely to grow in value, which protects your biggest gain. You can change your nomination, but you need to do it within two years of buying the second property.
Can You Use Your Spouse’s Allowance?
If you own a property with your spouse or civil partner, you each get a £3,000 annual exempt amount, which means that’s £6,000 of tax-free gain each year. If you own the property in your name only, consider transferring a share to your spouse before you sell because transfers between spouses don’t trigger CGT.
When Should You Time Your Sale?
Your tax rate depends on your total income for the year, so if you have a low-income year coming up, consider selling then because you might qualify for the 18% rate instead of 24%. Or split the sale across two tax years if possible, which gives you two annual exempt amounts.
Why Keep Detailed Records?
Start a property file as soon as you buy. Keep every receipt for:
- Purchase costs: solicitor, stamp duty, survey
- Improvements: not repairs
- Selling costs: estate agent, solicitor, EPC
Keep proof you lived there with utility bills, council tax bills, and GP registration letters because good records can save you thousands when you sell.
What Mistakes Should You Avoid?
Many property owners make these errors, so don’t be one of them.
Are You Using the Old 18-Month Rule?
The final period exemption changed in April 2020 to 9 months instead of 18, and many people still use the old 18-month figure, which leads to big surprises at tax time.
Are You Expecting Old Letting Relief?
Letting relief changed in 2020 and now works only if you shared the property with your tenant, so if you moved out in full, you don’t qualify – don’t assume you’ll get the old £40,000 relief.
Do You Keep Poor Records?
No receipts means no deductions, so if you can’t prove you spent £20,000 on a loft conversion, HMRC won’t accept it and you pay tax on that £20,000 instead.
Did You Miss Nomination Deadlines?
You have two years from buying a second property to nominate your main residence, and if you miss this deadline, HMRC chooses you based on where you spend most time, which might not be the property with the biggest gain.
Did You Get Consent to Let?
Your mortgage lender must approve before you rent out your property, and if you rent without permission, you breach your mortgage and your lender could demand full repayment.
Are You Waiting Until Day 59?
The 60-day deadline is strict and things go wrong – banks delay transfers, HMRC’s website crashes, or you can’t find a key document, so give yourself a buffer and aim to file by day 55.
Case Study: How We Helped One Client
The Situation: A client sold a flat they’d lived in for several years before letting it out, and they thought full relief would apply.
Our Solution: We examined their ownership history, calculated the gain, pinpointed qualifying PRR periods, including the final 9 months, and verified that letting relief was inapplicable under new rules before filing the CGT return on time.
The Result: The total gain was £175,000 where about 56% was exempt via PRR, leaving a taxable gain of £70,500 and CGT due of approximately £19,750, and HMRC accepted the return without enquiry with no penalties or late fees.
Testimonial: “I thought the sale would be straightforward, but the tax side was more complicated than expected – Lanop made it clear and stress-free.”
How Can Lanop Help?
At Lanop Business and Tax Advisors, we help property owners with CGT and private residence relief.
We help with:
- PRR and CGT calculations done with precision
- Checking if you qualify for relief in final period and shared-use scenarios
- Reviewing past lettings for any remaining relief
- Filing 60-day CGT returns to HMRC
- Planning before you move, sell, or re-let
- Building evidence files for HMRC reviews
Every situation is different, and we offer personal support backed by real-world experience, so if you’re unsure about your tax position, reach out for a confidential chat.
Conclusion: What Should You Do Before You Rent or Sell?
Moving from homeowner to landlord carries long-term tax effects, and private residence relief remains valuable, but the 2020 reforms mean it’s no longer automatic.
Document your residency history at an early stage and review your nomination status if you own multiple properties while understanding how rental periods will affect your tax bill when you sell. Before you sell, talk to a tax advisor, calculate your bill, and prepare the 60-day reporting deadline.
Gather cost records and improvement receipts now because this prevents last-minute stress and saves you from paying avoidable taxes or penalties.
FAQs
A tax break that reduces or removes CGT when you sell your main home. It works if the property was your main residence.
There’s no cap. It can exempt 100% of your gain if you qualify. You get partial relief if you rent it out or lived elsewhere.
Calculate in total gain. Work out what portion of ownership qualified as your main residence, plus the final 9 months. Apply that percentage to your gain.
Yes. Rental periods may cut your relief when you sell. Time not as your main residence can attract CGT.
It depends. PRR covers time you lived there. Rental periods create taxable gains except the final 9 months.
The final 9 months of ownership are tax-free even if you weren’t living there. The property must have been your main residence before that period.
Yes. If you move back and it becomes your main residence again, you qualify for PRR for that new period.
Only if you shared the property with tenants while it stayed your main home. Complete move-outs don’t qualify.
If you own two or more homes, nominate within 2 years of buying the second property to ensure relief on your most valuable asset.
You face penalties. Day 1 late costs £100. At 3 months you pay an extra 5% of tax due, minimum £300. Interest builds each day on unpaid tax.
No. Only capital improvements count. These are works that increased the property’s value on a permanent basis. Think extensions, not repainting.
You can’t deduct costs you can’t prove. Contact your solicitor for completion statements. Check old bank statements. Ask your mortgage lender for records.
Yes, if you complete one. Declare the same sale again. Your 60-day payment counts toward your final bill. HMRC will recalculate everything.
