Which Costs Reduce CGT on Rental Property? A Complete Guide for UK Landlords 

If you’re a landlord thinking about selling a buy-to-let property, one of the first questions you might ask is: “Which costs reduce CGT on rental property?” Understanding what expenses are allowable for Capital Gains Tax purposes can make a significant difference in how much tax you ultimately pay. 

This guide by CapitalGainsTaxExpert explains everything UK landlords need to know — from allowable CGT costs and enhancement expenditure to agency and legal fees — with clear examples based on HMRC guidance. 

Understanding CGT on Rental Properties 

When you sell a rental property for more than you originally paid, the profit (or gain) may be subject to Capital Gains Tax (CGT). The gain is calculated as: 

Selling price – (Purchase price + allowable costs + allowable improvements) 

You’ll only pay CGT on the profit after deducting eligible costs and your annual CGT allowance. 

Which Costs Reduce CGT on Rental Property? 

Let’s break down which costs to reduce CGT on rental property and how you can claim them correctly.

1. Purchase and Sale-Related Costs

When buying or selling a property, you’ll likely pay several fees and charges. Some of these are allowable deductions for CGT purposes. 

Allowable costs include: 

• Stamp Duty Land Tax (SDLT) paid at purchase 

• Solicitor and conveyancing fees 

• Estate agent or letting agent fees 

• Surveyor or valuation fees 

• Advertising costs incurred when selling 

These costs are directly linked to the transaction and therefore reduce the taxable gain. Always keep receipts and invoices to support your claim if HMRC requests evidence. 

2. Enhancement Expenditure (Property Improvements)

HMRC allows you to deduct capital improvements that increase the property’s value or extend its lifespan. 

Examples include: 

• Adding an extension or conservatory 

• Installing a new kitchen or bathroom (if it’s an upgrade, not a like-for-like replacement) 

• Loft conversions or structural renovations 

• Garden landscaping that adds permanent value 

These are known as enhancement costs, and they can be subtracted from your capital gain. 

However, repairs or maintenance do not qualify for capital improvements. 

For example: 

• Fixing a broken roof is a repair (not deductible for CGT). 

• Replacing a roof with a higher-quality structure that extends the building’s life is an improvement (deductible). 

3. Legal and Professional Fees

Certain legal and professional costs are allowable when they relate directly to buying or selling your rental property. 

You can deduct: 

• Legal fees from the purchase and sale process 

• Surveyor and valuation costs 

• Accountant or tax adviser fees linked to calculating the gain 

These expenses must be directly connected to the transaction itself and not to general property management or income tax preparation. 

4. Incidental Selling Costs

Incidental costs of selling your property can be included in your CGT calculation. 

Examples include: 

• Advertising the property 

• Auction fees 

• Energy Performance Certificates (EPCs) 

• Professional photography for marketing 

Even smaller costs like postage or administration charges linked directly to the sale may be allowable if properly documented. 

5. Costs of Acquiring the Property

When you first purchase your rental property, some upfront costs can be deducted later when you sell. 

Examples include: 

• Stamp Duty Land Tax (SDLT) 

• Legal conveyancing fees 

• Surveyor fees 

You cannot, however, claim mortgage interest or other financing costs against CGT (these may fall under income tax deductions during ownership instead). 

Repairs vs. Improvements – What’s the Difference? 

This is one of the most common areas of confusion among landlords. 

• Repairs are day-to-day maintenance costs to keep the property in good condition. 

• Examples: Repainting walls, fixing leaks, replacing worn carpets. 

• These can be claimed as income tax expenses, not CGT deductions. 

• Improvements enhance or increase the property’s value. 

• Examples: Adding an extension, installing double glazing, upgrading the kitchen to a higher standard. 

• These are capital costs and can reduce CGT. 

Understanding this distinction ensures you claim the right costs under the right tax category. 

Common Mistakes Landlords Make 

• Claiming repair costs as CGT deductions (these belong to income tax) 

• Failing to keep detailed receipts and proof of improvements 

• Forgetting to include selling or legal fees 

• Overlooking enhancement costs made years earlier 

• Not taking professional advice before selling 

Avoiding these errors ensures you only pay what you owe — and nothing more. 

When to Seek Professional Advice