Repairs vs Improvements: The Critical Tax Distinction Every Landlord Must Know

A repair is a revenue cost that a landlord can deduct in full against rental income in the year it is paid, whereas an improvement is a capital cost that cannot be deducted against rental profit and is instead set against capital gains tax when the property is sold. This single distinction decides more of a landlord's tax bill than any other rule, and getting it wrong is the most common reason landlords either overpay tax or trigger an HMRC enquiry. Understanding which allowable expenses landlords UK wide can claim against income, and which cannot, is essential. Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice, helps landlords apply this test correctly across their portfolios. This guide explains the difference, the grey areas, how replacement of domestic items relief works, and a worked example showing the cash impact.

Key Takeaways

• A repair restores an asset to its original condition and is a revenue expense deductible against rental income; an improvement enhances the asset beyond its original state and is a capital expense that is not.
• Capital costs are not deductible against rental income but are added to the property's base cost and reduce the capital gain when the property is sold, saving CGT at 18% or 24% for residential property in 2026/27.
• Replacing an asset with the nearest modern equivalent is a repair; replacing it with a materially better version is an improvement, and only the repair element is deductible.
• Replacement of domestic items relief allows a deduction for like-for-like replacement of free-standing furniture, appliances, carpets and soft furnishings in a let residential property, but not the first purchase.
• Like-for-like redecoration, fixing a leaking roof, and servicing a boiler are repairs; a new extension, a first fitted kitchen, or upgrading single to double glazing beyond the modern-equivalent standard are improvements.
• From 6 April 2026, landlords with qualifying income above £50,000 must keep digital records and file quarterly updates under Making Tax Digital for Income Tax.

What is the difference between a repair and an improvement?

A repair returns a property or asset to the condition it was originally in, while an improvement makes it better, bigger or different than before. That is the whole test, and every classification of buy-to-let expenses HMRC applies flows from it.

Repairs are revenue in nature and deductible against rental income in the tax year the cost is incurred. Typical repairs include replacing broken roof tiles, repainting and redecorating, mending a boiler, replacing rotten window frames with the modern equivalent, repointing brickwork, and fixing guttering. Improvements are capital in nature and cannot be set against rental income at all. Typical improvements include adding an extension or conservatory, converting a loft, installing a fitted kitchen where none existed, or landscaping a garden from scratch.

The reason the distinction matters so much is that the two types of expenditure are relieved in completely different ways and at completely different times. For the full framework, see our guide to allowable expenses for landlords.

How are capital improvements relieved instead?

Capital improvements are not wasted for tax; they are added to the base cost of the property and reduce the chargeable gain when the property is sold. A landlord who spends £30,000 on a loft conversion cannot deduct any of it from rental income, but that £30,000 is added to the acquisition cost when calculating capital gains tax on a future sale.

For residential property disposed of in 2026/27, capital gains tax is charged at 18% within the basic rate band and 24% above it, after the annual exempt amount of £3,000. So the £30,000 improvement above would reduce a higher-rate landlord's eventual CGT bill by £7,200 (£30,000 at 24%). The relief is real, but it is deferred, sometimes for decades, and it is given at the CGT rate rather than the income tax rate. This is why misclassifying a genuine repair as capital costs a landlord money, because an immediate deduction against rental income is almost always worth more than a distant reduction in a capital gain.

When does replacing something count as a repair?

Replacing part of an asset with the nearest modern equivalent is a repair, even if the new part is better than the worn-out original, because manufacturing standards have simply moved on. This is one of the most misunderstood points in rental property tax deductions.

HMRC accepts that you cannot buy 1970s materials in 2026, so replacing single-glazed wooden windows with modern double-glazed uPVC units is treated as a repair, not an improvement, because double glazing is now the standard equivalent. The same applies to replacing an old boiler with a modern condensing boiler. The line is crossed only when the work goes beyond the modern equivalent and genuinely upgrades the property, for example knocking two rooms into one, or replacing a basic kitchen with a substantially higher-specification one. Where an element of the cost is repair and an element is improvement, the cost is apportioned, and only the repair element is deductible against rental income.

How does replacement of domestic items relief work?

Replacement of domestic items relief lets a landlord deduct the cost of replacing free-standing furniture, appliances and soft furnishings in a let residential property, but only the replacement, never the first purchase. It applies to items such as sofas, beds, carpets, curtains, fridges, freezers, washing machines and crockery.

The relief is given on a like-for-like basis. If a landlord replaces a broken £400 washing machine with a similar £450 model, the full cost qualifies. If they replace it with a £700 washer-dryer, only the £450 cost of an equivalent washing machine is allowable, because the extra function is an improvement. Any amount received for the old item, such as a trade-in or scrap value, is deducted from the claim. Note that this relief covers free-standing domestic items, while fixtures that form part of the building, such as a fitted kitchen or a bathroom suite, are dealt with under the repair versus improvement rules above.

Both reliefs are claimed through the property pages, alongside the deductions listed in our guide to what landlords can deduct from rental profit.

Worked example: the cash impact of getting it right

A worked example shows how much the classification is worth in practice. Consider David, a higher-rate taxpayer letting a flat, who spends £8,000 in the 2026/27 tax year: £5,000 redecorating and fixing damp, £2,000 replacing a worn-out carpet and sofa like for like, and £1,000 upgrading a basic bathroom to a luxury suite.

The £5,000 of repairs and the £2,000 replacement of domestic items are revenue costs, so £7,000 is deductible against rental income. As a higher-rate taxpayer, that saves income tax at 40%, worth £2,800 in the current year. The £1,000 bathroom upgrade is a capital improvement, so it cannot be deducted from rental income; it is added to the property's base cost and will save CGT at 24% (£240) only when David eventually sells. Classifying the £7,000 correctly as revenue, rather than lumping the whole £8,000 as capital, is worth £2,800 now instead of a deferred £1,920, a substantial difference in both amount and timing.

Frequently Asked Questions

Is a new kitchen a repair or an improvement for a landlord?

Replacing an existing kitchen with a similar standard kitchen is a repair and deductible against rental income, because you are restoring what was there. Installing a kitchen where none existed, or fitting a substantially higher-specification kitchen, is a capital improvement and cannot be deducted from rental income, though it is added to the property's base cost for capital gains tax.

Can landlords claim redecorating costs against tax?

Yes. Redecorating a rental property, including painting, wallpapering and general upkeep between tenancies, is a revenue repair and fully deductible against rental income in the year the cost is incurred. Redecoration only becomes non-deductible if it forms part of a wider capital project, such as an extension, in which case it is treated as part of that improvement.

Is replacing single glazing with double glazing an improvement?

No, in most cases replacing single-glazed windows with modern double glazing is treated as a repair, not an improvement. HMRC accepts double glazing as the modern equivalent of what was originally installed, so the cost is deductible against rental income. It only becomes an improvement if the work goes further, such as adding new windows where none existed.

Are capital improvements ever tax-deductible for landlords?

Capital improvements are never deductible against rental income, but they are not wasted. The cost is added to the property's base cost and reduces the chargeable gain when the property is sold, saving capital gains tax at 18% or 24% for residential property in 2026/27. The relief is deferred until disposal rather than given in the year of spending.

What records do I need to keep for repairs and improvements?

You should keep every invoice, receipt and quotation, and note whether each cost is a repair or an improvement and why. Clear records let you defend the revenue treatment of repairs and support the base cost of improvements on a future sale. From 6 April 2026, landlords with qualifying income above £50,000 must keep these records digitally under Making Tax Digital for Income Tax.

How Blue Tick Can Help

Blue Tick Accountants helps landlords across the UK classify every cost correctly, so genuine repairs are claimed against rental income now and capital improvements are recorded to reduce future capital gains tax. Getting the repair versus improvement line right, and documenting it, is often the difference between a defensible return and an expensive enquiry. Head to our website and book a meeting now.

Conclusion

The repair versus improvement distinction is the most valuable rule a landlord can master, because it decides whether a cost is relieved now at your income tax rate or years later at the capital gains rate. Claim genuine repairs and like-for-like replacements against rental income in the year you incur them, record capital improvements against the property's base cost, and keep the evidence to support both. Applied consistently across a portfolio, this discipline can save thousands of pounds.

About the Author

This guide was written by Leon, founder of Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice that helps landlords, self-employed sole traders and limited company owners across the UK. It was last reviewed for the 2026/27 tax year.

This article is intended for general informational purposes only and does not constitute tax, legal, or financial advice. Tax rules are subject to change and their application will depend on your individual circumstances. You should always seek advice from a qualified professional before taking action. Blue Tick Accountants accepts no liability for decisions made on the basis of this content.

Related reading: How to Maximise Your Allowable Expenses as a UK Landlord.