A landlord’s guide to Self Assessment: rental income, in plain English

Plenty of people in Bury become landlords almost by accident — a house that didn’t sell, an inherited flat, a move in with a partner that left one home spare. Almost none of them think of themselves as running a business. HMRC, on the whole, does.

When do you need to file?

If your rental income is above HMRC’s property allowance, or your profit from letting exceeds the reporting threshold, you’ll need to register for Self Assessment and declare it. Even below those levels, other income or circumstances can pull you into filing. The safe move: check GOV.UK’s guidance for landlords when you start letting, not when the first tax year has already ended.

What counts as income

The rent, obviously — but also anything else the tenant pays you: contributions to utility bills, service charges you collect, and the part of any deposit you keep to cover damage. It’s the total received for the tax year that goes on the return, whether or not you think of it as “profit”.

What you can deduct

The costs of actually running the let, provided they’re wholly for the property business: letting-agent fees, landlord insurance, repairs and maintenance (not improvements — that distinction matters and is worth a conversation), accountancy fees, ground rent and service charges, and safety certificates. Mortgage interest is treated differently from other costs under current rules — it isn’t simply deducted as an expense — so check the present treatment on GOV.UK rather than assuming.

The records that save you

• Tenancy agreements and a running rent schedule;
• Invoices and receipts for every cost you intend to claim;
• Mortgage statements showing interest separately;
• Letting-agent statements, which often bundle several deductible items in one line.

Keep them for years after filing. A simple folder per property, per tax year, kept as you go, is the difference between a fifteen-minute return and a lost weekend.

Two traps I see repeatedly

First, treating an improvement as a repair. Replacing a broken boiler like-for-like is a repair; upgrading to a materially better system is an improvement, and the tax treatment differs. Second, forgetting that a property owned jointly is usually taxed jointly — each owner declares their share.

The honest summary

Letting a property is simple to get right and easy to get wrong, and the difference is almost entirely paperwork. Sort the records, understand what counts, and the tax stops being a source of dread.

Talha Sohail is an ACCA-qualified accountant from Bury, Greater Manchester, writing plain-English notes on tax and accounts for individuals and small businesses. This note is general guidance, not advice on your specific circumstances — tax rules and thresholds change, so check the current figures on GOV.UK or take advice before acting.