A Landlord’s Guide to Tax on Rental Income
Understanding how rental income is taxed helps landlords stay compliant, avoid penalties, and make the most of the reliefs available. UK property tax rules can feel complicated, but once you know the basics—what counts as income, what you can claim, and how to report it—the process becomes far more manageable.
What Counts as Rental Income
Rental income includes more than just the monthly rent. HMRC also treats the following as taxable:
- Payments for using furniture or appliances
- Service charges you collect (e.g., cleaning, gardening)
- Non‑refundable deposits
- Insurance payouts related to lost rent
- Rent from garages, driveways, or storage units
If you receive income from multiple properties, HMRC treats them as one “property business,” so profits and losses are pooled together.
Allowable Expenses You Can Claim
Allowable expenses reduce your taxable profit. Common examples include:
- Repairs and maintenance (e.g., fixing a boiler, repainting)
- Letting agent fees
- Accountancy fees
- Buildings and contents insurance
- Utility bills you pay as the landlord
- Replacement of domestic items (e.g., furniture, white goods)
- Service charges and ground rent
- Mileage for property-related travel
The key rule: the cost must be wholly and exclusively for the rental business.
Repairs vs Improvements
This is where many landlords get caught out.
- Repairs (fixing something back to its original condition) are allowable.
- Improvements (upgrading or adding something new) are not deductible against rental income.
Improvements may instead reduce Capital Gains Tax when you sell the property, but they don’t reduce your annual rental profit.
Mortgage Interest Relief
You can no longer deduct mortgage interest as an expense. Instead, you receive a 20% tax credit on the interest you pay. This affects higher‑rate and additional‑rate taxpayers most, as the relief is capped at the basic rate.
Joint Ownership and Split Income
If you own a property jointly:
- Married couples/civil partners are usually taxed 50/50 unless they file a Form 17 to split income based on actual ownership.
- Unmarried owners can split income however they choose, as long as it reflects the economic reality.
How to Report Rental Income
Most landlords report rental income through the Self Assessment tax return each year. You’ll need:
- Total rental income
- Total allowable expenses
- Mortgage interest paid
- Details of any joint ownership
- Records of replacements, repairs, and improvements
If you sell a rental property, you may also need to file a Capital Gains Tax return within 60 days of completion.
Common Mistakes to Avoid
- Claiming improvements as repairs
- Forgetting to include mileage or small expenses
- Missing the 60‑day CGT deadline
- Not keeping receipts or digital records
- Assuming mortgage interest is fully deductible
These mistakes often lead to higher tax bills—or HMRC enquiries.
Key Takeaway
Rental income tax doesn’t need to be overwhelming. Once you understand what counts as income, what you can claim, and how to report it, you can stay compliant and keep more of your profit. Good record‑keeping and clear categorisation make the biggest difference.