What is Capital Gains Tax on Rental Property?
Capital Gains Tax (CGT) is a tax you pay on the profit when you sell an asset that has increased in value. For UK landlords, this typically means the gain made when selling a buy-to-let property or a second home. You don’t pay CGT on the property’s entire sale price—only on the profit you’ve made after deducting allowable costs.
Understanding CGT is essential for any landlord planning their investment strategy. The tax can significantly impact your returns, especially if you’ve owned a property for many years during which values have risen substantially. With proper planning and knowledge of available reliefs, you can often reduce your CGT liability legally and efficiently.
It’s worth noting that CGT doesn’t apply to your main residence (your primary home), which is usually exempt under Private Residence Relief. However, if you’ve ever rented out your main home or owned multiple properties simultaneously, the rules become more complex.
When Do You Pay Capital Gains Tax on Rental Property?
You’ll typically face a CGT bill when you:
- Sell a buy-to-let property
- Sell a second home or holiday let
- Gift a property to someone (other than your spouse or civil partner)
- Transfer a property into a trust
- Receive compensation for a property (such as an insurance payout)
- Sell your share of a property to someone other than your spouse
The tax becomes due even if you don’t receive money directly—for instance, if you gift a property to your adult children, HMRC treats this as a disposal at market value, and you’ll owe CGT on the deemed gain.
Importantly, you must report and pay CGT on UK residential property within 60 days of completion. This is a separate reporting obligation from your Self Assessment tax return, and missing this deadline can result in penalties and interest charges.
How to Calculate Capital Gains Tax on Rental Property
Calculating your CGT liability involves several steps. Here’s the process broken down:
Step 1: Calculate Your Gain
Your capital gain is the difference between what you paid for the property (including costs) and what you sold it for (minus selling costs).
Sale proceeds minus original purchase price and associated costs equals your capital gain.
Step 2: Deduct Allowable Costs
You can deduct certain expenses from your gain:
- Original purchase price
- Stamp Duty Land Tax paid when you bought the property
- Estate agent fees, solicitor fees, and conveyancing costs (both when buying and selling)
- Costs of improvements (not repairs) such as extensions, conversions, or new kitchens
- Surveyor and valuation fees
You cannot deduct costs of repairs, maintenance, or mortgage interest—these may be deductible from rental income, but not from your capital gain.
Step 3: Apply Your Annual Exempt Amount
Every UK taxpayer receives an annual CGT allowance. For the 2025/26 tax year, this stands at £3,000 (reduced from £6,000 in 2023/24 and £12,300 previously). You can offset this allowance against your total gains for the year before calculating tax due.
If you’re married or in a civil partnership, each partner has their own allowance. Strategic planning—such as transferring property ownership between spouses before sale—can sometimes help utilise both allowances.
Step 4: Calculate Tax Owed
CGT rates on residential property depend on your Income Tax band:
- Basic rate taxpayers: 18% on gains
- Higher and additional rate taxpayers: 24% on gains
The rate you pay depends on your total taxable income plus your capital gain. If adding your gain to your income pushes you into the higher rate band, you’ll pay 18% on the portion within the basic rate and 24% on the remainder.
Example Calculation
Let’s say you’re a higher rate taxpayer who bought a rental property for £200,000 in 2015, paid £2,000 in Stamp Duty and £1,500 in legal fees. You spent £15,000 on a loft conversion. You sell in 2025 for £320,000, paying £4,000 in estate agent fees and £1,200 in legal fees.
- Sale proceeds: £320,000
- Less purchase price: £200,000
- Less purchase costs: £3,500 (Stamp Duty + legal fees)
- Less improvements: £15,000
- Less selling costs: £5,200
- Total gain: £96,300
- Less annual exemption: £3,000
- Taxable gain: £93,300
- CGT at 24%: £22,392
This illustrates why understanding CGT is crucial for landlords—it can represent a substantial cost that needs factoring into your investment returns.
Reporting and Paying Capital Gains Tax
Since April 2020, UK residents must report and pay CGT on residential property disposals within 60 days of completion using HMRC’s online Capital Gains Tax on UK Property Account service. This is in addition to reporting the disposal on your Self Assessment tax return.
The process involves:
- Creating a Capital Gains Tax on UK Property Account (or signing in to your existing Government Gateway account)
- Completing the online return with details of the sale
- Calculating and paying the tax due within 60 days
Missing this 60-day deadline results in penalties starting at £100, with additional charges for continued delays. Interest also accrues on unpaid tax from the deadline date.
You’ll still need to report the disposal again on your Self Assessment tax return for the relevant tax year, where any tax already paid will be credited against your overall liability.
Ways to Reduce Capital Gains Tax on Rental Property
Several legitimate strategies can help minimise your CGT bill:
Use Your Annual Exemption Strategically
Time property sales to make full use of your £3,000 annual exemption. If you’re selling multiple properties, consider spreading sales across different tax years.
Transfer Property Between Spouses
Transfers between married couples and civil partners are CGT-free. Transferring property ownership before sale can allow you to use both partners’ annual exemptions and potentially benefit from a lower tax rate if one partner is a basic rate taxpayer.
Claim Private Residence Relief
If you’ve ever lived in your rental property as your main home, you might qualify for Private Residence Relief on a portion of the gain. The final 9 months of ownership also qualify for relief if the property was once your main residence.
Offset Losses
Capital losses from other assets (including shares, business assets, or other properties) can be offset against property gains. You must report losses to HMRC within four years, even if you have no gains that year.
Consider Incorporation
Some landlords transfer their portfolio into a limited company structure. While this doesn’t avoid CGT on the transfer itself, it can provide long-term tax advantages. This is a complex decision requiring professional advice—using a specialist landlord accountancy service can help you model the numbers properly.
Claim Lettings Relief (Historical)
Lettings Relief was significantly restricted from April 2020 and now only applies when you let out a property that is (or has been) your main residence while you’re also living there. Most buy-to-let landlords no longer benefit from this relief.
Special Situations and Considerations
Non-Resident Landlords
If you’re non-UK resident when you sell a UK rental property, different rules apply. You still pay CGT on UK property gains, but the rates and reporting requirements may differ. Non-residents must also use the 60-day reporting service.
Property Held in Trust
Properties held in trust face different CGT rules, often with less generous allowances. Trustees should seek specialist advice before disposing of property.
Inherited Property
When you inherit property, you don’t pay CGT at that point. However, your “base cost” for future CGT calculations is the property’s market value at the date of death, not what the deceased originally paid. This often reduces the eventual CGT liability significantly.
Mixed-Use Property
If your property has been partly your home and partly a rental, or if it’s been used for business purposes, apportionment calculations become necessary. Professional advice is particularly valuable in these situations.
Getting Professional Help
CGT calculations can become complex, particularly when properties have been owned for many years, used for different purposes, or when multiple reliefs might apply. The potential tax savings from proper planning often far exceed the cost of professional advice.
A qualified accountant specialising in property taxation can help you:
- Accurately calculate your CGT liability
- Identify all available reliefs and allowances
- Plan the timing of property sales for maximum tax efficiency
- Structure your property portfolio tax-efficiently
- Complete your CGT returns correctly and on time
Many landlords also benefit from using specialist property accountancy software that tracks purchase costs, improvements, and other deductible expenses throughout ownership, making CGT calculations more straightforward when the time comes to sell.
Key Takeaways
Capital Gains Tax on rental property is a significant consideration for UK landlords that requires careful planning:
- CGT applies to the profit (gain) when you sell rental property, not the total sale price
- Current rates are 18% for basic rate taxpayers and 24% for higher rate taxpayers
- You must report and pay CGT within 60 days of completion using HMRC’s online service
- The annual exempt amount for 2025/26 is £3,000 per person
- Allowable deductions include purchase costs, Stamp Duty, selling costs, and improvements (but not repairs or mortgage interest)
- Strategic planning—including using both spouses’ allowances and timing sales—can significantly reduce your tax bill
- Private Residence Relief may apply if you’ve lived in the property as your main home
- Capital losses from other assets can offset property gains
Always consult a qualified accountant for advice specific to your circumstances. CGT rules are complex, and professional guidance can save you substantially more than it costs while ensuring you remain fully compliant with HMRC requirements.