Allowable expenses against rental income: a worked example, and how to calculate the tax

In England, the rental-expense rules below apply UK-wide, but the worked tax bands use England, Wales and Northern Ireland rates. Scotland uses its own income-tax bands for rental profit, so the expense calculation is the same but the tax line can differ.

What does a landlord's allowable-expenses calculation look like, worked through?

An individual landlord’s allowable-expenses calculation should exclude mortgage or loan interest entirely, because from 2020-21 “no deduction is allowed for costs of a dwelling-related loan” when calculating property-business profits for income tax. For example, start with £18,000 rent received, then deduct £1,800 agent fees, £750 insurance, £600 repairs, £300 safety certificates, £240 service subscriptions and £400 replacement furniture: allowable expenses are £4,090, so rental profit before finance-cost tax relief is £13,910. Do not deduct £5,000 mortgage interest in that expense line; companies may treat finance costs differently, but HMRC says of individual landlords, “You cannot do this if you're an individual landlord who pays Income Tax.” The alternative is the £1,000 property allowance, because legislation says “an individual's property allowance for a tax year is £1,000”; in this example, itemising £4,090 is better. Fixtures also stay out of replacement-of-domestic-items relief, and letting-agent fees commonly run 3%–16% of rent.

How do you calculate the tax on rental income once expenses are off?

To calculate tax on rental income after expenses, add the rental profit to the landlord’s other taxable income, apply the £12,570 Personal Allowance if available, tax the remaining income through the relevant bands, then apply any residential finance-cost tax credit separately rather than deducting interest as an expense. Using the worked example above, a landlord with £35,000 salary and £13,910 rental profit has total income of £48,910; after the £12,570 Personal Allowance, taxable income is £36,340, which remains within the basic-rate band in England, Wales and Northern Ireland, so the rental profit is effectively taxed at 20% if the salary has already used the allowance. The £13,910 rental profit would therefore create about £2,782 income tax before any finance-cost basic-rate reduction. Scotland is different: Scottish taxpayers use Scottish earned-income bands for rental profit, while gov.uk confirms “You'll pay the same tax as the rest of the UK on dividends and savings interest.”

What should you check off before you file?

Before filing rental income, check gross rent, each expense category, finance costs kept out of expenses, the £1,000 property allowance comparison, Self Assessment reporting status, Making Tax Digital status, and the filing deadline. Do not copy an agent’s net figure as your rental income: the NRLA’s practical warning is that “HMRC requires you to report the gross rent received and then list the agent's commission and management fees as an expense.” If gross property income is more than £1,000 but not more than £2,500, the rule is to contact HMRC, not automatically register for Self Assessment, because gov.uk says: “Contact HM Revenue and Customs (HMRC) if your income from property rental is more than £1,000 a year, up to £2,500.” Making Tax Digital already applies from 6 April 2026 where total annual income from self-employment and property is over £50,000. Abodient can track rent due, rent received, expenses and the figures a landlord needs for a tax return, which matters because the filing number starts with gross rent, not the agent’s net remittance.

Last reviewed August 2026.

Sources

• HMRC Property Income Manual PIM2010 — “This includes the 'wholly and exclusively' rule which says that expenses cannot be deducted unless they are incurred wholly and exclusively for business purposes.” Source
• ITTOIA 2005 s.272A — “In calculating the profits of a property business for income tax purposes for the tax year 2020-21 or any subsequent tax year, no deduction is allowed for costs of a dwelling-related loan.” Source
• ITTOIA 2005 s.311A — “In this section, “domestic item” means an item for domestic use (such as furniture, furnishings, household appliances and kitchenware), and does not include anything that is a fixture.” Source
• ITTOIA 2005 s.783BD — “For the purposes of this Chapter, an individual's property allowance for a tax year is £1,000.” Source
• Gov.uk, Renting out a property: paying tax — “You cannot do this if you're an individual landlord who pays Income Tax.” Source
• NRLA, The unseen expenses of being a landlord — “However, the convenience comes at a cost, with letting agent fees typically ranging from 3% to 16% of the monthly rent depending on what services you opt in to.” Source
• Gov.uk, Income Tax rates and Personal Allowances — “The standard Personal Allowance is £12,570, which is the amount of income you do not have to pay tax on.” Source
• Gov.uk, Scottish Income Tax — “You'll pay the same tax as the rest of the UK on dividends and savings interest.” Source
• Welsh Government, Draft Budget 2026-27 Welsh taxes — “The Welsh Government will set the Welsh rates of income tax at 10p in each band, subject to Senedd approval prior to the Final Budget for the three income tax rates (basic, higher and additional).” Source
• Finance Act 2009 Schedule 55 — “P is liable to a penalty under this paragraph of £100.” Source
• Gov.uk, Making Tax Digital for Income Tax — “From 6 April 2026, sole traders and landlords must use it if their total annual income from self-employment and property is over £50,000.” Source
• Gov.uk, Renting out a property: paying tax — “Contact HM Revenue and Customs (HMRC) if your income from property rental is more than £1,000 a year, up to £2,500.” Source
• NRLA, Making Tax Digital: are you and your agent on the same page? — “HMRC requires you to report the gross rent received and then list the agent's commission and management fees as an expense.” Source