Capital vs Revenue Expenditure for UK Landlords: The Repair vs Improvement Decision Guide

Whether a cost is capital or revenue expenditure is the single decision that drives a UK landlord's tax position on almost every pound spent on a property. Revenue costs cut your rental profit in the same year. Capital costs cannot touch your rental income at all; they sit in your base cost and reduce Capital Gains Tax when you sell. Classify a deductible repair as capital and you lose the immediate relief. Classify an improvement as a repair and you overstate your deductions, which is exactly the pattern HMRC looks for in an enquiry.

This page is the decision hub for that classification. It gives you the four HMRC tests, a top-of-page decision table, worked examples and the traps that catch landlords most often. Where a topic deserves a deeper dive, such as exactly which repairs are deductible or how improvements feed into a CGT calculation, we link out to the dedicated guide. Read this first, then follow the links to go deeper.

The decision at a glance

Most landlord costs fall into a recognisable pattern. The table below shows the common cases, the test that decides each one, and where the relief lands. Use it as a first sort, then read the relevant section for the borderline calls.

Cost example	Capital or revenue?	Which test decides it	Where the relief lands
Replace a broken boiler with an equivalent modern unit	Revenue	Like-for-like / character of asset	Deducted from rental income this year
Repoint brickwork, redecorate, replace worn carpets like-for-like	Revenue	Restoration vs enhancement	Deducted from rental income this year
Replace free-standing white goods or furniture in a let home	Revenue (via RDIR)	Like-for-like, capped at equivalent cost	Deducted from rental income this year
Re-roof the whole property with upgraded materials	Capital	Entirety + character of asset	Added to CGT base cost
Install central heating where none existed	Capital	Character of the asset	Added to CGT base cost
Loft conversion, extension, extra bathroom	Capital	Restoration vs enhancement	Added to CGT base cost
Repairs to a run-down property bought at a reduced price	Capital (initial repairs)	Law Shipping line	Added to CGT base cost

For the revenue side worked through in detail, see our guide to what repairs landlords can deduct from rental income. For the capital side, see how property improvements reduce CGT through enhancement expenditure.

Capital vs revenue: the core definitions

Revenue expenditure covers the cost of running and maintaining a property in its existing condition: routine repairs, redecoration, replacing worn parts like-for-like, agent fees, insurance, and similar running costs. It is deducted from rental income in the same tax year, reducing your taxable property profit. The legal test is the wholly-and-exclusively rule in ITTOIA 2005 section 34, which applies to property businesses through section 272.

Capital expenditure is money spent acquiring, extending, improving or enhancing the property beyond its original state. Capital expenditure on a rental property cannot be deducted from rental income. Instead, qualifying enhancement spending is added to the property's base cost and reduces the gain when you sell, under TCGA 1992 section 38(1)(b). The relief is real, but it lands years later and at the CGT rate rather than your income tax rate.

That contrast is the whole game. The revenue expenditure versus capital expenditure question in the UK is really a timing question: relief now against income, or relief later against a capital gain. The legal labels matter because they decide which return the cost belongs on, and getting the label wrong is rarely neutral.

That timing difference is why the classification matters so much. A £900 boiler repair deducted this year saves income tax now. A £40,000 extension sits in your base cost until disposal and only saves CGT when, and if, you sell at a gain. Misclassifying the repair as capital costs you the immediate relief; misclassifying the extension as a repair overstates your deductions and is exactly the kind of error HMRC looks for.

How HMRC decides if it is capital or revenue

There is no single rule that settles every case, and the size of the bill does not decide it. HMRC's Property Income Manual at PIM2030 sets out the framework an inspector uses to decide whether work on a rental property is a deductible repair or capital improvement. In practice it comes down to four tests, and a cost is capital if it is caught by any one of them. When you are weighing whether expenditure on a property is capital or revenue, run all four rather than stopping at the first that seems to fit.

1. The like-for-like test

Replacing something with a broadly similar item of broadly similar quality is normally a repair. Swapping a worn bathroom suite for a comparable new one is a repair. Replacing it with a luxury spa bathroom is an improvement. The comparison is with a modern equivalent of the original, not with the materials available decades ago.

2. The entirety test

HMRC looks at whether the work repairs a subsidiary part of a larger asset, or replaces the asset in its entirety. Replacing a few damaged roof tiles is a repair to the roof. Stripping and rebuilding the entire roof, especially with upgraded materials, can be the renewal of the whole and treated as capital. The key question is: what is the asset, and have you repaired part of it or renewed all of it?

3. The restoration versus enhancement test

Work that restores an asset to its former condition is a repair. Work that makes it better than it was, or adds something that was not there, is an improvement. Replacing rotten window frames with equivalent new ones restores; adding a conservatory enhances.

4. The character of the asset test

This is the test most landlord guides miss, and the one HMRC leans on for borderline cases. If the work changes the nature or character of the asset, it is capital even if it looks like a replacement. Conversely, an upgrade that uses modern materials but leaves the function and character broadly the same is still a repair. PIM2030 makes this point directly: an alteration due to advances in technology, such as single glazing replaced by double glazing, is generally an allowable repair where the functionality and character of the asset are broadly unchanged. Replacing a pitched roof with a flat one, or knocking two flats into a house, changes the character and is capital.

Worked example: kitchen replacement

Consider a landlord refurbishing the kitchen in a ten-year-old let house. The same project can contain both limbs.

• Revenue (repair): replacing a broken oven with a comparable model, fixing damaged units, replacing worn laminate worktops with similar laminate, retiling to a similar standard. These restore the kitchen and are deductible against rental income.
• Capital (improvement): redesigning the layout, installing granite worktops where laminate existed, adding an island unit, upgrading from a basic range to a premium fitted kitchen. These enhance beyond the original and are added to the CGT base cost.

The nearest-modern-equivalent principle does the heavy lifting here. You will struggle to buy a like-for-like 2014 kitchen in 2026; using current materials of broadly equivalent quality is still a repair. It only becomes an improvement once the specification or layout is genuinely upgraded.

Initial repairs and the Law Shipping trap

One of the most expensive misclassifications is treating initial repairs to a newly bought property as deductible. Where you acquire a run-down property at a price that reflects its poor condition, and the works are needed to put it into a usable or lettable state, those repairs are capital, not revenue.

The principle comes from the case law line of Law Shipping Co Ltd v CIR and Odeon Associated Theatres Ltd v Jones. In short: if the purchase price was reduced because the property was dilapidated, the cost of putting it right is part of the cost of acquiring a usable asset and is added to the base cost. By contrast, where you buy a property that was already in a fit state and it deteriorates through normal wear during your ownership, repairs you carry out later are ordinary revenue repairs. HMRC's Property Income Manual at PIM2025 sets out the general repairs position.

A worked illustration: you buy a property for £180,000, reduced from a typical £200,000 because the roof is failing, and you spend £8,000 on roof works straight after completion. Because the price reflected the defect and the works made the property fit to let, that £8,000 is likely capital, added to your base cost. If instead the roof had been sound at purchase and failed three years into your ownership, the same £8,000 would be a revenue repair. The surveys, the marketing particulars and the price you paid are the evidence that decides it, so keep them.

Replacement of Domestic Items Relief (not the old Renewals Allowance)

Older guidance still refers to a "renewals allowance" for furniture and appliances in furnished lettings. That basis was abolished from April 2016. The current relief is Replacement of Domestic Items Relief (RDIR) under ITTOIA 2005 section 311A, and it works differently in two important ways.

• It is like-for-like, not a free upgrade. Section 311A(9) restricts the deduction where the new item is not the same or substantially the same as the old one: relief is capped at what an equivalent replacement would have cost, and you cannot relieve the cost of the upgrade element.
• It is net of disposal proceeds. The deduction is reduced by anything you receive for the old item you are replacing.

RDIR covers free-standing domestic items in a let residential dwelling (white goods, furniture, carpets, curtains, crockery and similar), and it applies to unfurnished and part-furnished lets, not just fully furnished ones. It does not cover the initial provision of an item (only replacements), and it does not apply to the old furnished holiday lettings regime, which was abolished from 6 April 2025. For the mechanics and the qualifying-item detail, see our guide to Replacement of Domestic Items Relief.

Capital allowances and integral features

A common misconception is that landlords can claim capital allowances on the boiler, white goods and fixtures inside a let home. They generally cannot. CAA 2001 section 35 denies plant and machinery allowances for plant or machinery for use in a dwelling-house within a UK or overseas property business. This applies to individual and company landlords alike; it is not a company-only rule. The route for replacing free-standing domestic items in a dwelling is RDIR, not capital allowances.

Capital allowances can still apply, but only in qualifying non-dwelling areas: the common parts of a block of flats (a communal boiler, lift or lighting), and commercial or mixed-use space. In those areas the rates are:

• Main-pool writing-down allowance: 14% from April 2026, reduced from 18% by Finance Act 2026 section 28 (a hybrid, time-apportioned rate applies where a chargeable period straddles the start date).
• Special-rate pool: 6%, unchanged. This pool includes integral features (electrical systems, cold water systems, space and water heating, air conditioning and lifts) under CAA 2001 section 33A, where they sit in qualifying non-dwelling areas.
• New 40% first-year allowance on new and unused main-rate plant bought from 1 January 2026 by unincorporated businesses (Finance Act 2026 section 29), excluding cars, second-hand assets and assets for overseas leasing.

Finance Act 2026 received Royal Assent on 18 March 2026, so these are current rules, not proposals. For the full mechanics across the pools, see our guide to capital allowances on property.

Mixed and apportioned expenditure

Real refurbishments rarely fall cleanly into one box. A whole-house renovation typically restores some things (revenue) and improves others (capital) in the same set of invoices. HMRC accepts a reasonable apportionment on the facts. The practical approach is to itemise the works, identify the repair limb and the improvement limb separately, and support the split with a contractor scope of works.

For example, rewiring to the same standard as before is a repair, but if you also add extra circuits to support a new extension, that part is capital. Plastering after damp treatment is a repair; the same plastering as part of converting a garage into a habitable room is capital. Claim the repair element against rental income and add the improvement element to the base cost, and record how you arrived at the split.

Tax treatment and where the relief lands

To bring it together:

• Revenue costs are deducted from rental income in the same tax year, reducing your taxable property profit and giving relief at your income tax rate.
• Capital costs that are enhancement expenditure are added to the property's base cost under TCGA 1992 section 38(1)(b) and relieve against the gain on disposal. For 2026/27 the residential CGT rates are 18% within the basic-rate band and 24% above it, with a £3,000 annual exempt amount.

A point of caution on section 38(1)(b): the enhancement must still be reflected in the state or nature of the property at the time you sell. Spending that has since been removed, superseded or worn out does not qualify, so the original works that were later ripped out in a second refurbishment do not stay in your base cost. For how this feeds a full computation, see our complete guide to Capital Gains Tax on property and the detail on enhancement expenditure.

One thing the capital-versus-revenue line does not govern is mortgage interest. Finance costs sit in a separate regime: under the Section 24 mortgage interest restriction, interest is relieved as a 20% basic-rate tax credit rather than a deduction. Do not fold finance costs into your repair-or-improvement analysis; they follow their own rules.

Record-keeping and Making Tax Digital

Classification is only as good as the evidence behind it. The records that matter most are:

• Itemised invoices and receipts with clear descriptions of what was done.
• Before-and-after photographs showing the condition restored or the improvement made.
• Contractor scope-of-works letters distinguishing repair from improvement, which support any apportionment.
• Purchase evidence, surveys, marketing particulars and the price paid, which decide the initial-repairs question.

This discipline matters more under Making Tax Digital for Income Tax, which is live from 6 April 2026 for landlords with qualifying income above £50,000, extending to £30,000 from April 2027 and £20,000 from April 2028. Quarterly digital reporting means your classifications are visible to HMRC sooner and more often, so getting the capital-versus-revenue split right at the point of spending, with the evidence on file, is no longer something you can leave to the year-end.

Common mistakes landlords make

1. Treating every property cost as deductible

Assuming all spending can be claimed against rental income leads to overstated returns and is a frequent trigger for HMRC enquiries. Improvements and initial repairs belong in the base cost, not the year's deductions.

2. Inconsistent classification across a portfolio

Classifying similar work differently across properties without a reason undermines your position. Treat like work alike unless the facts genuinely differ, and be ready to explain why.

3. Ignoring the purchase context

Failing to consider whether work was effectively bought with the property is the classic initial-repairs error. If you bought cheap because the property needed work, much of that work is capital.

4. Assuming a better replacement is fully deductible

Under RDIR, upgrading a replaced item only attracts relief up to the cost of an equivalent item. The upgrade element is not deductible, and treating it as if it were is a common slip.

When to get this checked

The classification rewards specialist input at a few decision points: a major refurbishment with mixed elements, the purchase of a run-down property you intend to renovate, an HMRC query about a previous return, or simply bringing consistency to a growing portfolio. The numbers at stake on a single misclassified refurbishment are often far larger than the cost of getting advice.

For a wider view of what you can claim, see our guide to allowable landlord tax deductions, or read more about what a property accountant does. The capital-versus-revenue line is the gateway to your whole tax position, so it is worth getting right from the first invoice.