Know your taxable
rental profit before
self-assessment
Enter your income and allowable expenses. Get your net taxable rental profit — the number your accountant needs or that goes on your self-assessment. Handles Section 24 correctly. Takes under 2 minutes.
Get your net rental profit in under 2 minutes
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Preview — what you'll get
What getting this wrong actually costs
What happens when you put guessed numbers on your self-assessment instead of calculated ones
The tax restriction most landlords still misunderstand — your mortgage interest is NOT fully deductible
Missed allowable expenses that many landlords forget to claim — repairs, landlord services, and more
The self-assessment deadline — arriving unprepared with unverified profit figures costs time and money
This calculator gives you your net rental profit — not your tax bill. Your actual tax depends on your total income, tax band, and personal allowance.
How it works
Your taxable rental profit in under 2 minutes
Enter your income
Enter your annual rental income (or monthly — toggle between the two). Add any other income sources like parking or storage.
Add your expenses
Enter your allowable expenses across 7 categories. Add your annual mortgage interest separately — we handle Section 24 correctly.
Get your profit figure
See your net taxable rental profit instantly. Download a PDF summary to share with your accountant or use in your self-assessment.
What's included
Everything you need for an accurate profit figure
Income, 7 allowable expense categories, Section 24 handled correctly, 5 live outputs, a plain-English disclaimer, and a PDF summary — all free.
Rental Income
2 inputsAnnual or monthly rental income — toggle between the two. Add other income sources like parking or storage separately.
7 Expense Categories
7 categoriesLetting fees, repairs, insurance, landlord services, accountancy, ground rent/service charge, and other allowable costs.
Section 24 Handled
Built inMortgage interest is shown separately — not deducted from profit. Includes plain-English explanation of the Section 24 restriction and your basic rate credit.
Live Results
5 live outputsGross income, total allowable expenses, net rental profit, mortgage interest, and your 20% tax credit — all update as you type.
Property Details
OptionalNote number of properties and flag joint ownership. Profit is shown per your total portfolio — split-ownership is flagged clearly.
PDF Summary
PDF includedDownload a clean A4 summary showing your net rental profit, all inputs, the Section 24 explanation, and the HMRC self-assessment reminder.
Auto-Saved Locally
PrivateYour figures are saved in your browser. Come back any time and your numbers will still be there — nothing is sent to a server.
Honest Disclaimer
No guessworkThis gives you your taxable profit figure — not your tax bill. Your actual tax depends on your personal income and allowances. We're clear about that.
Why landlords use this
Stop guessing. Know your exact taxable profit before January arrives.
- Section 24 handled correctly — mortgage interest shown separately, not deducted from profit
- Calculates the 20% basic rate mortgage interest tax credit automatically
- Covers all major HMRC-allowable expense categories — nothing missed
- Joint ownership flagged clearly — reminds you to split the profit figure correctly
- Honest disclaimer built in — profit is not your tax bill, and we say so clearly
- PDF summary ready to share with your accountant or attach to your records
- Figures saved locally in your browser — private, no server upload, no account needed
“I'd been guessing my profit for years and always ended up in a panic in January. This gave me a clean figure in 10 minutes — and reminded me about three expense categories I'd been forgetting to claim.”
Self-assessing landlord— 2 properties, Manchester
“The Section 24 explanation alone was worth it. I finally understand why my taxable income and my actual profit are two different numbers. This tool handles it properly — most free tools just ignore it.”
Portfolio landlord— 5 properties, Birmingham
“Gave this to my accountant before our annual meeting and she said it was exactly the right breakdown. Saved us about 30 minutes of back and forth.”
BTL investor— 3 properties, Leeds
Ready to go into self-assessment with the right number?
Enter your income and allowable expenses. Get your net taxable rental profit — cleanly calculated, correctly structured, and ready to hand to your accountant or enter into HMRC.
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