How Do You Calculate Capital Gains Tax On Property

Estimate your capital gains tax liability when selling residential or investment property in the UK

How to Calculate Capital Gains Tax on Property: Complete UK Guide (2024)

Capital Gains Tax (CGT) on property can significantly impact your finances when selling a residential or investment property. This comprehensive guide explains exactly how to calculate your potential CGT liability, what allowances and reliefs you can claim, and how to legally minimise your tax bill.

Key Takeaways

• CGT applies to the gain (profit) from selling property, not the total sale price
• Main homes typically qualify for Private Residence Relief (no CGT)
• Second homes and rental properties are always taxable
• Everyone gets an annual tax-free allowance (£6,000 in 2023/24, £3,000 in 2024/25)
• Tax rates are 18% or 28% for residential property (depending on your income)

2024 CGT Rates for Property

Income Tax Band	CGT Rate (Property)
Basic rate (£12,571-£50,270)	18%
Higher rate (£50,271-£125,140)	28%
Additional rate (over £125,140)	28%

Step 1: Determine If You Need to Pay Capital Gains Tax

Not all property sales are subject to CGT. You don’t need to pay if:

• The property is your main home and you’ve lived there throughout ownership (Private Residence Relief applies)
• You’re selling the property to your spouse or civil partner
• You’re gifting the property (though other taxes may apply)
• Your total taxable gains for the year are below the annual exemption (£3,000 in 2024/25)
• You made a loss on the sale (though you can use this to reduce other gains)

You DO need to pay CGT if:

• It’s a second home or holiday home
• It’s a buy-to-let or rental property
• It’s a business premises
• You’ve let out part of your home (partial relief may apply)
• You’ve used part of your home exclusively for business
• The property is over 5,000m² (including gardens/grounds)

Step 2: Calculate Your Capital Gain

The basic formula for calculating your capital gain is:

Capital Gain = Sale Price – (Purchase Price + Improvement Costs + Selling Costs)

What you can include in costs:

1. Purchase price: The original amount you paid for the property
2. Purchase costs: Stamp duty, legal fees, survey costs from when you bought it
3. Improvement costs: Extensions, loft conversions, new kitchens/bathrooms (not general maintenance)
4. Selling costs: Estate agent fees, legal fees, advertising costs

Example Calculation

Purchase price: £300,000
Purchase costs: £5,000
Sale price: £450,000
Selling costs: £10,000
Improvements: £40,000

Total allowable costs: £300,000 + £5,000 + £10,000 + £40,000 = £355,000
Capital gain: £450,000 – £355,000 = £95,000

Step 3: Apply Relevant Reliefs and Allowances

Several reliefs can reduce your taxable gain:

1. Private Residence Relief (PRR)

The most valuable relief – if the property has been your main home at any point, you may qualify for:

• Full relief: If it’s been your only/main home for your entire ownership period
• Partial relief: For periods it was your main home plus the final 9 months of ownership (regardless of use)

2. Annual Exempt Amount

Everyone gets an annual tax-free allowance:

• 2023/24: £6,000
• 2024/25: £3,000

3. Letting Relief

If you’ve let out part of your home, you may qualify for up to £40,000 letting relief (though rules changed in 2020 – now only available if you shared occupancy with the tenant).

4. Business Asset Disposal Relief

If the property was used for business (e.g., a rental business), you might qualify for 10% tax rate on the first £1 million of gains (lifetime limit).

Step 4: Calculate Your Taxable Gain

After applying reliefs, your taxable gain is calculated as:

Taxable Gain = Capital Gain – (Private Residence Relief + Annual Exempt Amount + Other Reliefs)

Step 5: Determine Your Tax Rate

For residential property, CGT rates depend on your income tax band:

Taxable Income	Basic Rate Taxpayer	Higher/Additional Rate Taxpayer
Up to £50,270 (2024/25)	18%	N/A
Over £50,270	N/A	28%

Important note: Your capital gain is added to your taxable income to determine which rate applies. This can push you into a higher tax band.

Tax Rate Example

Annual income: £45,000
Capital gain: £30,000
Annual exemption: £3,000
Taxable gain: £27,000

Total income for CGT: £45,000 + £27,000 = £72,000
Tax calculation:

• First £5,270 of gain (takes income to £50,270): 18% = £948.60
• Remaining £21,730 of gain: 28% = £6,084.40
• Total CGT due: £7,033.00

Step 6: Report and Pay Your Capital Gains Tax

You must report and pay any CGT due:

• For UK residents: Through Self Assessment tax return (by 31 January following the tax year)
• For non-residents: Within 60 days of completion (30 days for sales before 27 October 2021)

Payment deadlines:

• 31 January if reporting through Self Assessment
• 60 days for non-residents (or 30 days for pre-October 2021 sales)

How to Legally Reduce Your Capital Gains Tax Bill

1. Use your annual exemption: Time sales to use both your and your spouse’s allowances (£6,000 each in 2023/24)
2. Transfer assets to spouse: Use their lower tax band if applicable
3. Offset losses: Use capital losses from other assets to reduce your gain
4. Claim all reliefs: Ensure you claim Private Residence Relief and Letting Relief if eligible
5. Defer payment: Consider reinvesting in EIS or SEIS qualifying companies
6. Gift assets: Transfer property to family members (though other taxes may apply)
7. Use trust structures: For high-value properties (seek professional advice)

Common Mistakes to Avoid

• Forgetting to include all costs: Missing improvement or selling costs increases your gain
• Incorrectly calculating PRR: Not accounting for periods of absence or letting
• Missing deadlines: Late reporting can incur penalties
• Not keeping records: HMRC may challenge your valuation without receipts
• Assuming main home is exempt: If you’ve let it out or used it for business, partial CGT may apply

Capital Gains Tax on Inherited Property

Special rules apply when selling inherited property:

• The purchase price is the property’s value at the date of death (not what the original owner paid)
• If sold quickly, there may be little or no gain
• If kept and then sold later, CGT applies to the increase in value from inheritance to sale
• Inheritance Tax may have been paid (40% over £325,000 threshold), but this doesn’t affect CGT

Capital Gains Tax for Non-UK Residents

Since April 2015, non-residents must pay CGT on UK residential property sales. Key points:

• Must report and pay within 60 days of completion
• Same rates apply (18%/28%) but no annual exemption for most non-residents
• Private Residence Relief may still apply if it was your main home
• Must register for UK tax even if no CGT is due

Capital Gains Tax vs Income Tax on Property

Factor	Capital Gains Tax	Income Tax (Rental Income)
Trigger	Selling property	Receiving rental income
Tax Rates (2024/25)	18% or 28%	20%, 40% or 45%
Allowances	£3,000 annual exemption	£1,000 property allowance
Reliefs Available	Private Residence Relief, Letting Relief	Property expenses, mortgage interest relief (20% credit)
Payment Deadline	31 January (or 60 days for non-residents)	31 January (through Self Assessment)

Recent Changes to Capital Gains Tax (2023-2024)

• April 2023: Annual exemption reduced from £12,300 to £6,000
• April 2024: Annual exemption further reduced to £3,000
• October 2021: Reporting deadline for non-residents extended from 30 to 60 days
• April 2020: Letting Relief restricted to only apply when owner shares occupancy with tenant
• April 2020: Final period exemption reduced from 18 to 9 months

When to Seek Professional Advice

Consider consulting a tax advisor if:

• The property was owned before April 2015 (different rebasing rules)
• You’re non-UK resident selling UK property
• The property was inherited and you’re unsure of the valuation
• You’ve lived abroad during ownership
• The property was used for business (mixed use)
• You have multiple properties to sell
• The gain is over £50,000 (complex tax planning may help)

Frequently Asked Questions

Do I pay Capital Gains Tax when selling my main home?

Generally no, if it’s been your only/main home throughout ownership. However, if you’ve let it out, used part for business, or have large grounds (>5,000m²), partial CGT may apply.

How is Capital Gains Tax calculated on a second home?

For second homes, the full gain is taxable (after deducting costs). You calculate the gain as sale price minus (purchase price + costs), then apply either 18% or 28% tax depending on your income.

Can I avoid Capital Gains Tax by gifting property?

Gifting doesn’t avoid CGT – it’s treated as a sale at market value. The recipient may also face Inheritance Tax if you die within 7 years. There are some exceptions for spouses/civil partners.

What happens if I sell a property at a loss?

You don’t pay CGT on losses. Instead, you can use the loss to reduce gains on other assets (now or in the future). You must report losses to HMRC to claim this relief.

How does Capital Gains Tax work for buy-to-let properties?

Buy-to-let properties are fully taxable. You calculate the gain as normal, then pay 18% or 28% tax. You can deduct costs like agent fees, maintenance (if capital improvements), and legal fees.

What records do I need to keep for Capital Gains Tax?

HMRC recommends keeping records for at least 5 years after the tax year of sale. Essential documents include:

• Purchase and sale contracts
• Receipts for improvement works
• Estate agent and legal fees
• Valuation reports (for inherited property)
• Records of any periods the property was let or used for business

Authoritative Resources

For official guidance, consult these sources:

• GOV.UK: Capital Gains Tax Overview – Official government guide to CGT rules and rates
• GOV.UK: Tax When You Sell Property – Specific guidance on property sales
• Oxford University: Capital Gains Tax Analysis – Academic perspective on recent CGT changes

Final Thoughts

Calculating Capital Gains Tax on property requires careful attention to detail – from accurately tracking your purchase and improvement costs to correctly applying reliefs and allowances. The UK’s CGT rules for property are complex, with different treatments for main homes, second homes, and investment properties.

While this guide provides comprehensive information, every situation is unique. For high-value properties or complex ownership histories, professional tax advice can potentially save you thousands in unnecessary tax payments. Always keep thorough records and consider the timing of property sales to maximise your allowances.

Remember that tax rules change frequently – the annual exemption has been significantly reduced in recent years, and further changes may be announced in future budgets. Stay informed about current rates and reliefs to ensure you’re not paying more tax than necessary.