Landlord Tax Calculator UK 2025/26

Reviewed by Mustafa Bilgic
UK Calculator Editor · Updated May 2026

Three taxes a UK landlord cares about

A typical individual residential landlord in 2025/26 worries about three taxes: income tax on rents (with the Section 24 mortgage interest credit), Capital Gains Tax on eventual sale, and (for limited-company landlords) corporation tax on company profits and personal tax on dividends drawn.

National Insurance is rarely an issue — rental income is investment income, not earned income, and is outside Class 1, 2 and 4 NI even when the landlord owns multiple properties. The main exception is genuinely furnished holiday lets pre-2025, which were treated as a trade.

Limited company landlord economics in 2026

Many higher-rate landlords have moved to a limited company structure since Section 24 took full effect. Inside a company, mortgage interest is fully deductible, the corporation tax rate starts at 19% (£0-£50k profits) rising to 25% (£250k+) with marginal relief between, and the property is held outside the personal tax net.

The downside is double tax on extracted profits: 19–25% corporation tax then dividend tax of 8.75/33.75/39.35% on dividends after the £500 dividend allowance. For landlords who reinvest profits in more property the company structure is often dramatically better; for those who need to draw the income personally, the savings are smaller.

Single BTL basic-rate landlord

Rent £14,400, expenses £3,000, interest £4,200, PAYE £30,000. Profit £11,400. Tax 20% × £11,400 = £2,280. Credit 20% × £4,200 = £840. Net IT: £1,440.

Higher-rate three-flat landlord

Combined rent £42,000, expenses £8,500, interest £18,000, PAYE £55,000. Profit £33,500. Tax 40% × £33,500 = £13,400. Credit £3,600. Net IT: £9,800. Effective rate on rent 23%.

Eventual sale of one flat

Sold for £290,000, bought £180,000, costs £20,000. Gain £90,000. Higher-rate CGT: (£90,000 − £3,000) × 24% = £20,880. Reportable within 60 days of completion via HMRC online.

Common mistakes to avoid

• Treating mortgage interest as expense (S24 changed this from April 2020).
• Forgetting CGT 60-day reporting on residential sales.
• Failing to claim wear & tear via the replacement of domestic items relief.
• Missing the £1,000 property allowance test on small lets.
• Forgetting that Capital Gains Tax basic-rate slice depends on remaining basic-rate band each year.

When to use this calculator

Year-end planning, pre-incorporation review, sale planning. Particularly useful when comparing personal-name vs company-structure outcomes.

How this differs in Scotland, Wales and Northern Ireland

Scottish landlords pay income tax at Scottish bands (19/20/21/42/45/48%), worsening the S24 squeeze for higher-rate Scots. CGT rates are UK-wide. The £1,000 property allowance and S24 are UK-wide. NI and Wales follow England's bands.

When this calculator is and isn't the right tool

The Landlord Tax Calculator UK 2025/26 above is built for the most common UK 2025/26 scenarios in this tax area. It will be the right tool when your situation maps cleanly onto the inputs — single property or simple aggregation, standard HMRC rates and bands, and individual taxpayer (rather than complex trust or partnership structures). It is informational and does not replace tailored advice from a chartered tax adviser, especially for transactions above £500,000, cross-border situations, or where reliefs interact with each other. For year-end filings, always reconcile with HMRC's own free calculators on gov.uk before pressing submit on Self Assessment.

Closely related calculators

• Property Income Tax 2025/26 — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.
• Section 24 Calculator — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.
• Rental Income Tax — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.
• CGT on Property — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.
• BTL SDLT — useful when you need a different angle on the same UK property tax topic, especially if your situation involves multiple types of property income or disposal.

Glossary of UK property tax terms

Section 24

The 2017 rule replacing full mortgage interest deduction with a 20% tax credit for individual residential landlords.

SA105

The Self Assessment supplementary form for UK property income.

Box 44

The SA105 box for residential property finance costs (mortgage interest).

Property allowance

£1,000 tax-free band for individual property income, claimable instead of expenses.

Rent-a-Room scheme

Separate £7,500 allowance for letting a furnished room in your main home.

Tax planning checklist

1. Confirm the figures input above match your actual position — purchase contract, mortgage offer or completion statement.
2. Cross-check the year (2025/26) — figures change every April. The tax year 2026/27 starts 6 April 2026.
3. Use HMRC's official calculator at gov.uk for the final filing figure; this calculator is informational.
4. Keep records for at least 6 years — HMRC's normal enquiry window. 21 years for fraud investigations.
5. Discuss any unusual transaction (joint purchase, gift, divorce settlement, trust) with a qualified tax adviser.
6. Submit your return online via Government Gateway — paper deadlines are earlier and penalties harsher.