Landlord Tax Return: The Complete 2025/26 Guide

Who needs to file a landlord tax return?

If you receive rental income from UK property and you are an individual (not a limited company), you need to report it through Self Assessment. HMRC's rules on when registration is required are:

• Rental income above £2,500 per year (after expenses): you must file a Self Assessment return and include the SA105 UK Property pages.
• Rental income between £1,000 and £2,500 per year (after expenses): HMRC may collect this through your PAYE tax code if you are employed, but you should contact HMRC to confirm. Filing a return is the safe approach.
• Rental income under £1,000 per year: the property allowance means this income is exempt. You do not need to declare it or file a return for rental income alone at this level.

Note that the thresholds above relate to rental income. If you also have other reasons to file a Self Assessment return (self-employment, investment income, overseas income), you must include your rental income in that return regardless of the amount.

If this is your first year receiving rental income, you must register for Self Assessment by 5 October in the tax year you first received rental income. For 2025/26 income, the registration deadline is 5 October 2026.

SA105 form walkthrough: the key boxes

The SA105 UK Property pages are supplementary pages that attach to your main Self Assessment return. You complete them once for all your UK property income — you do not need a separate SA105 for each property unless you have furnished holiday lettings, which are reported on a separate page.

Allowable expenses on a landlord tax return

The general principle is that an expense is allowable if it is incurred wholly and exclusively for the purpose of the rental business. Personal expenses are not deductible. The key distinction that trips up landlords is repairs versus improvements.

Repairs: allowable

Repairs restore the property to its original condition. They are fully deductible against rental income:

• Fixing a broken boiler or replacing it like-for-like
• Repainting the interior after tenant damage
• Fixing a leaking roof
• Replacing broken windows
• Repairing gutters, fences, and gates

Improvements: not allowable

Improvements enhance the property beyond its original state. They are capital expenditure and not deductible against rental income — though they may reduce your Capital Gains Tax liability when you eventually sell:

• Converting a loft into a habitable room
• Replacing a functional single-glazed window with double-glazing
• Adding a conservatory or extension
• Installing a new kitchen when the old one was serviceable

Replacement of Domestic Items Relief

For furnished properties, the Replacement of Domestic Items Relief allows you to deduct the cost of replacing domestic items (white goods, furniture, soft furnishings, carpets, cutlery) on a like-for-like basis. You cannot claim the initial purchase of furnishings — only replacements. The relief was introduced in 2016 to replace the old Wear and Tear Allowance. HMRC PIM3210 covers the full rules.

Expenses you cannot claim

• Mortgage capital repayments (only the interest is a finance cost)
• Personal travel not related to the property
• Costs incurred before the property was first let
• Legal costs for purchasing the property (capital expenditure)
• Private use of any expense (e.g., a laptop used partly for personal reasons)

Section 24 mortgage interest restriction on your landlord tax return

Section 24 of the Finance Act 2015 changed how mortgage interest is treated on the landlord tax return. Since 6 April 2020, mortgage interest is no longer deductible as a property expense. Instead, it is entered in Box 44 (Residential finance costs), and HMRC calculates a 20% basic-rate tax credit on the full amount.

The practical effect is that your taxable rental profit is higher than your cash profit. For higher-rate taxpayers, Section 24 can produce situations where you owe tax on a property that is cash-negative. Our guide to Section 24 mortgage interest contains three worked examples showing the impact at basic rate, higher rate, and the extreme leveraged case.

Landlord tax return worked example: realistic 2025/26 figures

The example below uses a mid-market landlord profile: one buy-to-let property, an outstanding mortgage, managed through a letting agent. The landlord is employed and pays 40% Income Tax on all rental profit (employment income places them in the higher-rate band).

Use our landlord tax calculator to run these figures with your own numbers. It applies the Section 24 credit automatically and shows the before-and-after position.

Landlord tax return deadlines 2025/26

Missing the 31 January filing deadline incurs an automatic £100 penalty, regardless of whether any tax is owed. Further daily penalties apply after three months. Interest runs on unpaid tax from 1 February.

Payments on account: the landlord tax payment that catches people out

If your Self Assessment tax bill exceeds £1,000, HMRC requires you to make “payments on account” — advance payments towards your next year's tax bill. These are paid in two instalments: 50% by 31 January and 50% by 31 July.

In your first year of filing a return, this can come as a surprise: you pay not only your tax bill for the year just ended but also a 50% advance towards the following year, all by 31 January. For a landlord with a £4,000 annual tax bill, the first January payment would be £6,000 (£4,000 for 2025/26 plus £2,000 as the first payment on account for 2026/27).

You can apply to reduce payments on account if you expect your tax bill to be lower in the coming year — for example, because you have sold a property or expect lower income. Reducing them when you should not can lead to interest charges, so seek advice before doing so.

Landlord tax return from 2026: Making Tax Digital replaces annual filing

From 6 April 2026, landlords with qualifying income (rental plus self-employment) above £50,000 must keep digital records and submit quarterly updates to HMRC through MTD-compatible software — rather than filing a single annual return. The quarterly reports cover income and expenses for each three-month period; the End of Period Statement (EOPS) replaces the SA105 at year end; and the Final Declaration replaces the main Self Assessment return.

The change affects what you submit and when, not what you pay. The same SA105 rules — allowable expenses, Section 24, Replacement of Domestic Items Relief — apply under MTD. The difference is that instead of gathering records once a year and filing by 31 January, you maintain records throughout the year and submit four quarterly updates plus the EOPS. The Final Declaration deadline replaces the 31 January Self Assessment deadline.

For the 2026/27 tax year, the first quarterly update covers 6 April 2026 to 5 July 2026, with a submission deadline of 7 August 2026. HMRC's MTD for Income Tax guidance has the full deadline schedule. For a complete explanation of the MTD process, read our MTD for landlords guide.

Landlords below the £50,000 threshold continue to file an annual Self Assessment return. The threshold drops to £30,000 qualifying income from April 2027 and £20,000 from April 2028.

Common landlord tax return mistakes and how to avoid them

Frequently asked questions