UK Landlord Rental Income Tax Calculator

About the UK Landlord Rental Income Tax Calculator

Work out the Income Tax on a UK rental profit the way HMRC does. Rents less allowable expenses give the profit, but mortgage interest and other residential finance costs are not deducted: instead you get a tax reduction of 20% of the lowest of your finance costs, your property profits and your income above the Personal Allowance (GOV.UK). For a landlord with £35,000 of other income, £18,000 of rents, £2,000 of expenses and £8,000 of mortgage interest, the rental profit costs £1,746.00 in tax in Tax Year 2026-27.

Enter your rents, expenses, finance costs and other income for Tax Year 2025-26 or 2026-27, in England, Wales or Northern Ireland or in Scotland. The calculator compares actual expenses with the £1,000 property allowance, uses losses and finance costs brought forward, carries forward what is left, shows which band your profit is taxed in and what the finance cost rule costs you compared with deducting the interest. Nothing you type leaves your browser.

Without a pass, the free preview shows the tax on your rental profit in full, with the first row of each table and the first step of the working; a Pro pass unlocks every figure: the profit, the finance cost reduction, the comparison, the carried-forward amounts, the whole working, the summary to copy, the CSV and printing.

Common uses

• Working out how much to set aside for the tax on a buy-to-let.
• Seeing whether the property allowance beats claiming expenses for a small let.
• Understanding why a mortgage interest restriction pushed you into the higher rate band.
• Checking a Self Assessment calculation before you file.

How rental profit is worked out

Add up all rents and other receipts of your property business (all your UK lets count as one business) and take off allowable expenses: repairs and maintenance (not improvements), letting agent and management fees, insurance, ground rent and service charges, council tax and bills you pay, accountant’s fees, and replacing furniture and appliances in the same kind (GOV.UK). The full mortgage payment is never an expense, only its interest, and for a residential let that interest is relieved as a tax reduction instead. Interest on a loan for commercial property is still an ordinary expense.

Mortgage interest: the 20% tax reduction

For individual landlords of residential property, finance costs (mortgage and loan interest, arrangement fees, interest on loans for furnishings) give a tax reduction at the basic rate: 20% of the lowest of

• your finance costs for the year plus any brought forward;
• your property profits for the year, after losses brought forward;
• your adjusted total income above the Personal Allowance (income after losses and reliefs, without savings and dividends).

It cannot make a refund. If profits or income were the lowest figure, the rest of the finance costs is carried forward to the next year (GOV.UK). Higher and additional rate taxpayers pay tax on the interest at 40% or 45% but get relief at 20%; in Scotland the intermediate rate of 21% is also above it. Companies are not affected.

The £1,000 property allowance

With gross property income of £1,000 or less, the income is tax-free and you do not need to declare it. Above that, you may take £1,000 off the rents instead of all your expenses; it cannot create a loss (GOV.UK, PIM4436). It cannot be used in a year you claim the finance cost reduction, and a year that uses it carries no finance costs forward. With finance costs brought forward from earlier years, rents over £1,000 can use it only if no tax would be due after it: otherwise HMRC applies the brought-forward reduction, and the calculator uses actual expenses (PIM4460). It suits small lettings with low expenses; it does not cover rooms let in your own home under the Rent a Room Scheme, which has its own £7,500 limit.

Losses, joint ownership and reporting

If expenses are more than the rents, the loss is carried forward and set against your next rental profits (not against pay). Jointly owned property is taxed on each owner’s share; married couples and civil partners living together are taxed in equal shares unless they own unequal shares and declare it. With rental profit over £2,500, or rents over £10,000 before expenses, you send a Self Assessment tax return; with more than £1,000 up to £2,500 you contact HMRC instead (GOV.UK). Landlords and sole traders whose rents and self-employed income together pass the Making Tax Digital threshold must keep digital records and send quarterly updates (GOV.UK).

Announced from Tax Year 2027-28

The government has announced separate rates for property income in England, Wales and Northern Ireland from 6 April 2027: 22% (property basic rate), 42% (higher) and 47% (additional), with the finance cost reduction at 22% (HM Treasury and HMRC, Budget overview). The calculator covers Tax Years 2025-26 and 2026-27, the years whose rates apply now.

Limitations

• Residential lets of an individual in the UK. Furnished holiday lets, commercial lets with mixed finance costs, rent-a-room income, overseas property, partnerships, trusts and companies follow other rules.
• Capital allowances, the replacement of domestic items relief and cash-basis choices go in your expenses figure as you have worked them out.
• Income Tax only: no National Insurance is due on rental profit unless you run a property business as a trade, and Capital Gains Tax on selling a property is separate.
• Tax Years 2025-26 and 2026-27. An estimate from HMRC’s published rates and rules, not tax advice.
• MySmartCoPilot is not affiliated with or endorsed by HMRC.

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