Repairs and Maintenance vs Improvements: The Tax Difference

Why the Distinction Matters

The difference between a repair and an improvement is one of the most important distinctions in UK tax. Get it right, and you claim your costs correctly. Get it wrong, and HMRC could challenge your tax return.

Repairs and maintenance are revenue expenses. They're deducted from your profits in full in the year you incur them.

Improvements are capital expenditure. They're not deducted from profits directly — instead, they may qualify for capital allowances, which spread the deduction differently.

The tax relief might be similar in the long run, but the timing and method of claiming differ significantly.

What Counts as a Repair?

A repair restores an asset to its previous condition without improving it. You're putting something back to the way it was — fixing what's broken, worn, or deteriorated.

Examples of repairs:

• Replacing a broken window with an equivalent window
• Fixing a leaking roof with similar materials
• Repainting walls that have become worn
• Repairing a broken boiler
• Replacing worn-out flooring with equivalent flooring
• Fixing damaged plumbing
• Replacing a broken door with a similar one
• Patching cracks in walls or ceilings
• Servicing and repairing machinery
• Replacing worn-out parts in equipment

The "Like-for-Like" Test

The clearest indicator of a repair is replacing like for like. If your office window breaks and you replace it with an identical or equivalent window, that's a repair. If you replace it with a triple-glazed, noise-reducing upgrade, that's at least partly an improvement.

Modern materials can complicate this. If the original material is no longer available (e.g., a specific type of tile or fitting), replacing with a modern equivalent that serves the same function is generally treated as a repair, even if the modern version is technically better.

What Counts as an Improvement?

An improvement enhances an asset beyond its original condition. You're making it better, more valuable, or more capable than it was before.

Examples of improvements:

• Converting a loft into an office
• Installing central heating where there was none before
• Adding a new room or extension
• Upgrading single-glazed windows to double-glazed
• Installing air conditioning
• Fitting a new kitchen that's significantly better than the original
• Adding security systems that didn't exist before
• Rewiring an entire property to a higher specification
• Laying a new driveway

Upgrades During Repairs

This is where it gets tricky. If you repair something but upgrade it at the same time, HMRC may treat the whole cost — or part of it — as an improvement.

Example: Your boiler breaks down. You replace it with a modern, energy-efficient model that costs £3,000. A like-for-like replacement would have cost £2,000.

In this case, £2,000 might be treated as a repair (the cost of replacing like-for-like) and £1,000 as an improvement (the additional cost of the upgrade). In practice, HMRC often accepts the full cost as a repair if the upgrade is modest and the primary purpose was to fix what was broken.

Special Rules for Property

If you're a landlord or use property in your business, the repair vs improvement distinction is particularly important.

Initial Repairs

Repairs to a property that was in a state of disrepair when you bought it are generally treated as capital expenditure, not revenue repairs. HMRC considers that you bought the property in its dilapidated condition and the "repair" is actually bringing it up to a usable standard — an improvement.

However, if the property was in reasonable condition when purchased and deteriorated afterwards, subsequent repairs are genuine revenue expenses.

The Entirety Principle

HMRC looks at the "entirety" being repaired. Replacing a few broken tiles on a roof is a repair to the roof. Replacing the entire roof is still a repair to the building (because the roof is just a part of the building). But replacing the entire building is not a repair — it's a new asset.

This principle generally works in the taxpayer's favour. Even significant work on a component of a larger asset (replacing all the windows, re-roofing, re-plumbing) can qualify as a repair to the building as a whole.

For Equipment and Machinery

Repairs

• Replacing worn-out parts
• Servicing and maintenance
• Fixing breakdowns
• Replacing consumables (blades, filters, belts)
• Cleaning and reconditioning

Improvements

• Adding new features or capabilities
• Upgrading performance beyond original specification
• Converting equipment for a different purpose
• Adding automation or computerisation to manual equipment

How to Claim

Repairs (revenue expenses): Deduct the full cost from your business profits in the year the work is done and paid for. Include under "repairs and maintenance" in your accounts.

Improvements (capital expenditure): Claim through capital allowances. Most business assets qualify for the Annual Investment Allowance (100% in year one, up to £1 million). Property improvements may not qualify for AIA but might qualify for other capital allowances depending on the nature of the work.

Maintenance Contracts

Regular maintenance contracts (servicing agreements, annual inspections, pest control, cleaning contracts) are revenue expenses, claimed in the year they relate to. These keep assets in working order without improving them.

Record-Keeping

For repairs and maintenance:

• Keep invoices and receipts from contractors and suppliers
• Note the nature of the work done (repair, replacement, or improvement)
• If work includes both repair and improvement elements, ask the contractor to itemise them separately on the invoice
• Photograph the work before and after if there's any doubt about whether it's a repair or improvement

With Accounted, Penny helps you categorise repair and improvement costs correctly when you submit invoices.

Common Mistakes

Claiming improvements as repairs. This is one of the things HMRC checks during enquiries. If you replaced a basic kitchen with a luxury one, that's an improvement.

Treating all property work as capital. Many landlords and business owners assume all property work must be capitalised. Genuine repairs are deductible immediately.

Not splitting mixed invoices. If a contractor does both repair work and improvements in one job, ask for the invoice to separate the costs.

Forgetting about initial repairs. If you buy a property in poor condition, the initial work to bring it up to standard is capital, not revenue.

Get your repair claims right every time. Start your free trial with Accounted and let Penny categorise your maintenance costs correctly.