Tax is where careless landlords quietly lose a month's rent every year. Not to the tax office — to their own paperwork. Deductible costs that never got recorded are deductions that never get claimed, and the difference lands straight on your tax bill.
The rules vary by country, so treat this as a map of the territory, not advice for your specific return. When in doubt, check with an accountant.
In short: most tax systems let you deduct the ordinary running costs of letting — mortgage interest, repairs, management and letting fees, insurance, service charges and professional fees — against your rental income. Improvements aren't deductible against income; they cut your capital gains tax when you sell. And any deduction you can't evidence is one you can't safely claim.
The costs landlords usually deduct
Most tax systems let you offset the ordinary running costs of letting a property against the rent it earns. The usual suspects:
- Mortgage interest — often the largest single item, though several countries now restrict or convert it to a tax credit
- Repairs and maintenance — fixing what's broken, repainting, servicing the boiler
- Management and letting fees — agency commission, tenant-find fees
- Insurance — buildings, contents, landlord liability
- Service charges and ground rent on leasehold property
- Property taxes and licensing fees
- Accountancy and professional fees tied to the letting
- Utilities and council tax during void periods, when you foot the bill
Repairs vs improvements — the line that matters
This trips up almost everyone. Repairs restore what was already there and are usually deductible in the year you pay them. Improvements make the property better than before — a new extension, a first-time fitted kitchen — and are treated as capital. You generally can't deduct them against income; they reduce your capital gains tax when you sell instead.
Replacing a broken fence: repair. Replacing the fence with a brick wall: improvement.
Get this wrong and you either over-claim now or lose the relief later.
"Repairs come off this year's rent. Improvements wait until you sell." — PropFlow
The records that make or break a claim
A deduction you can't evidence is a deduction you can't safely claim. For every property, keep:
- Every invoice and receipt, dated and tied to the property
- Bank records showing the payment left your account
- A running log of rent received and costs paid
- Mileage or travel records if you visit the property
- The split between repair and improvement spend
This is the boring part, and it's exactly the part software exists for. PropFlow logs each cost against the property it belongs to, tags it by category, and exports a year-end financial pack your accountant can actually use — so at tax time you're filtering a clean record, not hunting through a shoebox.
If those records are starting to outgrow a spreadsheet, compare the PropFlow plans before tax season forces the decision.
Key takeaways
- Ordinary running costs are usually deductible against rental income; improvements are capital.
- Repairs restore what was there; improvements make it better — the line decides when you get relief.
- Keep dated invoices, bank records and a rent-vs-cost log for every property.
- Good record-keeping turns tax season into a filter, not a search.
Before you file
Know your deductible costs before you buy, not after. Drop your numbers into the rental yield calculator to see how running costs reshape your return — the same costs that, recorded properly, become deductions.