Self-assessment for landlords: property income and allowable expenses

 


If you rent out property in the UK, HMRC expects you to report that income through self-assessment, and the difference between a clean filing and an expensive enquiry usually comes down to two things: knowing what counts as income, and knowing what you are allowed to deduct. This is the practical rundown.

What counts as rental income

Rental income is broader than the rent cheque. It includes any regular payments from tenants, but also things landlords forget: rent paid in advance, deposits you retain at the end of a tenancy, charges for services you provide as part of the letting (cleaning, gardening, utilities you recharge), and insurance payouts for lost rent. If money came in because of the property, HMRC almost certainly counts it.

If your total property income is under 1,000 a year, the property allowance covers it and you do not need to report it. Above that, the income goes on the property pages of your self-assessment return.

Allowable expenses you can claim

You can deduct the genuine costs of running the letting. The common ones: letting agent fees, legal fees for lets under a year, accountants fees, buildings and contents insurance, ground rent and service charges, council tax and utilities you pay between tenancies, cleaning and gardening, and the cost of repairs (not improvements). Repairs keep the property in its existing state; improvements that add value or change its character are capital, and treated differently.

Travel to inspect the property or meet tenants and agents is claimable, as are phone and home-office costs apportioned to the letting business. Keep receipts for all of it. HMRC does not accept "roughly" as a record-keeping standard.

The finance cost restriction, in brief

Since April 2020, individual landlords can no longer deduct mortgage interest in full. Instead, finance costs (mortgage interest, arrangement fees) attract a 20 percent tax reducer, a basic-rate tax credit against the bill. Higher and additional-rate taxpayers feel this most: the interest still counts when calculating total income (which can push you into a higher band), but the relief is capped at 20 percent. This is the single most misunderstood rule in landlord tax, and it catches out new landlords every year. Good tax compliance support will model the effect before you buy, not after.

Records that survive an enquiry

Keep digital records of every item of income and every expense, with receipts or invoices attached. Bank statements alone are not enough; HMRC wants to see what each transaction was for. A simple system works: one bank account for the property business, receipts photographed into your accounting app the day they arrive, and a monthly 15-minute review. With MTD for Income Tax arriving from April 2026 for landlords with qualifying income above 50,000, this discipline is about to become mandatory anyway.

Key deadlines

Register for self-assessment by 5 October following the tax year you first had rental income. File online by 31 January, and pay what you owe (plus any payment on account) by the same date. Miss the filing deadline and the 100 pound penalty is automatic; miss it by three months and daily penalties start. Put the dates in your calendar the day the tenancy begins, not the January you discover them.

Getting the structure right from the start, with clean records and the right expense claims, is what separates profitable landlords from stressed ones. Firms like Finex Outsourcing, a Global Business Services provider at finexoutsourcing.com, support UK landlords and their accountants with bookkeeping and tax compliance services that keep the property pages of the return accurate and enquiry-proof.


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