Landlord Repairs vs Capital Works: What MTD Allows

Why This Single Distinction Trips Up So Many Landlords

You replace a broken boiler. You repaint the hallway. You fit new double-glazed windows to replace the single-glazed ones that were there when you bought the place. All three feel like money you spent on your rental property - so surely all three count as expenses you can deduct from your rental income? Not quite. HMRC draws a firm line between repairs and capital works, and that line determines whether a cost goes into your quarterly update or somewhere else entirely. Get it wrong and you could either overstate your expenses (risking an enquiry) or understate them (paying more tax than you owe). This post explains exactly where the line sits, with concrete examples that reflect the kinds of decisions landlords actually face.

The Core Distinction: Repairs vs Capital Works

HMRC uses two categories for money spent on a rental property. Understanding the difference is fundamental before you touch a single expense field in your MTD software.

Allowable repairs

A repair restores something to its original working condition. It does not improve the property beyond what was already there. These costs are revenue expenses - they are deductible from your rental income and belong in your quarterly update.

Capital works (improvements)

A capital work adds something new, upgrades the standard of the property, or extends its useful life beyond what it had before. These are capital expenditure. They are not deductible from rental income in your quarterly update. Instead, they may be relevant to Capital Gains Tax when you eventually sell the property - but that is a separate calculation, handled separately from MTD income and expenses.

Concrete Examples: What Goes Where

The rule sounds simple enough in theory. In practice, the line between "repair" and "improvement" is genuinely blurry in some cases. These examples cover the most common scenarios.

Repainting walls and ceilings

Repainting a room that was already painted - using a similar finish and colour - is a repair. It restores the property to its previous condition. This is an allowable expense. You can include it in your quarterly update under property expenses.

If you are decorating a room that was never decorated before (for example, a raw plasterwork extension you added), the painting is part of the capital improvement, not a separate repair. That cost would follow the capital works treatment.

Replacing windows

This is one of the most common areas of confusion. If you replace single-glazed windows with double-glazed windows, HMRC treats that as an improvement - the property is now better than it was. That is capital expenditure, not an allowable repair.

However, if you replace like-for-like - for example, replacing broken double-glazed units with equivalent double-glazed units - that is a repair and is allowable.

The test HMRC applies is whether the replacement represents a significant improvement on what was there before. Modern materials may be used (you cannot always source identical components), but if the overall standard of the item is broadly equivalent, a like-for-like replacement is usually treated as a repair.

Roof repairs vs full replacement

Fixing a section of damaged roof - replacing tiles, repairing flashing, sealing a leak - is a repair. Allowable expense, goes in your quarterly update.

Replacing the entire roof with a new one is more complex. If the roof was at end of life and you replaced it with the same type of roof, HMRC may still accept this as a repair. But if you replaced a basic felt flat roof with a high-specification slate or tiled structure that significantly outlasts and outperforms the original, that begins to look like an improvement - especially if it adds value to the property.

There is no single bright line here. The size of the job and what was there before both matter. If you are spending significant money on a full roof replacement, it is worth making a note of what was replaced and why, so you can justify your treatment if HMRC ever asks.

Boiler replacement

Replacing a broken boiler with a broadly equivalent one is a repair. Allowable expense. Replacing an old basic boiler with a high-efficiency system boiler and installing a full set of smart heating controls for the first time is more likely to be treated as an improvement - particularly the new controls element, which did not exist before.

Kitchen and bathroom works

Repairing a cracked sink or replacing a broken tap is a repair - allowable. Fitting an entirely new kitchen where the old one was functional (even if dated) is an improvement - capital expenditure. Replacing a kitchen that was genuinely beyond use with one of equivalent standard is closer to a repair, but you would need to be able to show the old one was not functional rather than simply unfashionable.

Damp treatment and structural repairs

Treating rising damp, repointing brickwork, repairing a cracked wall - these are repairs. Allowable expenses. Building an extension or converting a loft to create additional habitable space is clearly capital expenditure.

The "Entirety" Principle

HMRC uses a concept sometimes called the "entirety" principle when assessing borderline cases. The question is: what is the asset you are repairing?

If you replace a broken window in a building, the asset is arguably the whole building, and a single window is just part of it - so replacing one window is a repair to the building. But if you replace every single window in the property as part of a planned improvement programme, HMRC may look at the programme as a whole and treat it differently.

This does not mean you cannot claim repairs across multiple areas of the same property in one year. It does mean that if a large programme of work is clearly intended to upgrade the property rather than simply maintain it, the treatment may be different to individual repair jobs taken in isolation.

Where These Costs Actually Go in MTD

Allowable repairs - quarterly updates

Allowable repair costs are entered in the property expenses section of your quarterly update. In MTD for Income Tax (MTD ITSA), you report income and expenses for each quarter (April to June, July to September, October to December, January to March). Repairs you pay for during a quarter go into that quarter's expenses.

You categorise them under the relevant expense type - in most MTD software this will be something like "repairs and maintenance" or "property repairs". If you are using AffordableMTD's CSV import or AI categorisation tool, these will usually be suggested automatically based on the description, but always check the category before confirming. See our guide on importing expenses using CSV upload and AI categorisation.

Capital works - not in quarterly updates

Capital expenditure does not go into your quarterly updates as a deductible expense. It is not part of your rental income calculation at all in the normal sense.

For residential landlords, capital improvements are relevant when you eventually sell the property - they can reduce the capital gain you make on sale, which may reduce the Capital Gains Tax you owe at that point. This is entirely separate from MTD income reporting. You do not declare this in your quarterly updates or in the property expenses section of your final declaration.

Your MTD final declaration does include some capital-related fields (for example, if you have commercial property or furnished holiday let allowances), but for standard residential lettings, capital improvements are simply not a deduction against income.

Keeping the Right Records for Each Type

For repairs, you need to keep the invoices or receipts that show what was done, when, and what it cost. Your bank statement showing payment is a supporting document, not a replacement for the invoice itself. See our full guide on what backup records to keep for your MTD quarterly update.

For capital works, keep the same level of documentation - but store it separately from your routine expense records. You will need it when you eventually sell the property, which could be many years away. Do not discard capital works receipts just because they are not going into this year's MTD expenses. Our guide on how long to keep records after filing covers the general retention rules, but for capital expenditure documents you should consider keeping them for as long as you own the property plus at least six years after disposal.

What to Do If You Are Genuinely Unsure

Some jobs sit right on the borderline. If you are genuinely unsure whether something is a repair or an improvement, these questions can help you think it through:

• Was something already there that you are replacing? (If yes, lean toward repair.)
• Is the replacement broadly equivalent to what was there? (If yes, lean toward repair.)
• Has the property been improved beyond its previous condition, or just restored to it? (Restored = repair; improved = capital.)
• Would a buyer pay more for the property specifically because of this work? (If clearly yes, capital expenditure is more likely.)
• Is this part of a larger planned upgrade or renovation? (If yes, the whole programme may be capital.)

If you answer these questions and you are still not sure, and the amount is significant, it is worth getting a professional opinion before you file. The cost of a short conversation with an accountant is likely to be less than the cost of an HMRC correction later. You can also check the HMRC Property Income Manual at PIM2020, which sets out HMRC's view on repairs and improvements in detail.

For routine expenses you are more confident about, our broader guide to what counts as a landlord expense in your MTD quarterly update covers the full range of allowable costs.

A Note on the Replacement of Domestic Items Relief

There is one specific relief worth knowing about: Replacement of Domestic Items Relief. This applies to furnished residential lettings and covers the cost of replacing domestic items such as sofas, beds, fridges, washing machines, and similar moveable items.

If you replace an old sofa with a new equivalent sofa, you can claim the cost of the replacement (minus any amount you receive for the old item) as an allowable expense. This is not the same as claiming capital expenditure - it is a specific relief designed to allow like-for-like replacements of moveable furnishings.

This relief does not apply to fixtures (things fixed to the building, like fitted kitchens or bathroom suites) - those follow the repairs vs capital works rules described above. And it does not apply if the property is let unfurnished or if it is a furnished holiday letting (different rules apply there).

Check the HMRC guidance on expenses for landlords for the current rules on this relief.

Putting It Together in Practice

Here is a quick summary of how the most common jobs map to the two categories:

• Repainting walls (like-for-like): Allowable repair - quarterly update
• Replacing single-glazed with double-glazed windows: Capital improvement - not in quarterly update
• Replacing double-glazed with equivalent double-glazed: Allowable repair - quarterly update
• Repairing a section of roof: Allowable repair - quarterly update
• Replacing the whole roof (like-for-like): Likely allowable repair, but keep clear records
• Fitting a new kitchen where there was already a functioning kitchen: Capital improvement
• Replacing a broken boiler with equivalent: Allowable repair - quarterly update
• Treating damp, repointing brickwork: Allowable repair - quarterly update
• Building an extension or converting a loft: Capital improvement - not in quarterly update
• Replacing an old sofa with equivalent (furnished let): Replacement of Domestic Items Relief - quarterly update

Getting this right matters not just for accuracy in your quarterly updates, but for the longer term record of what you have spent on your property. When you sell, the capital works records you keep now may reduce your tax bill then. Treat them as important documents, even though they are not going into your MTD expenses today.

If you want a broader look at how your landlord expenses fit into the MTD picture, our guide to allowable expenses for sole traders and landlords covers the full picture, and our post on which expenses count for self-employment vs property is useful if you have both types of income.