5 Self Assessment Mistakes Landlords Should Avoid
If you receive rental income from a property, you may need to declare it to HMRC through a Self Assessment tax return. For many landlords, the tax return seems straightforward at first, but small mistakes can lead to incorrect tax calculations, missed expenses, HMRC queries or penalties.
At Gondal Accountancy, we regularly support landlords with rental income reporting, Self Assessment tax returns and Making Tax Digital preparation. Here are five common mistakes landlords should avoid.
1. Not declaring all rental income
Landlords must keep details of all rent received, including any additional income from services provided to tenants, such as cleaning, maintenance or other property-related charges. HMRC guidance confirms that landlords should keep records of all rent received, service income, rent books, receipts, invoices and bank statements.
Even if the rent is paid in cash, through a letting agent, or split between joint owners, it still needs to be recorded properly.
2. Claiming incorrect expenses
A common mistake is treating every property cost as an allowable expense. Some costs may be allowable, while others may be capital improvements or personal costs. Repairs, maintenance, cleaning, insurance, letting agent fees and certain finance costs may need careful treatment.
The key point is simple: do not guess. Keep invoices and receipts, then let your accountant decide the correct tax treatment.
3. Mixing personal and property finances
Many landlords use the same bank account for personal spending and rental income. This makes it harder to track property profit, expenses and cash flow.
A separate bank account for rental income and property expenses can make record keeping much easier, especially if you have more than one property.
4. Forgetting about the UK property pages
If you receive rental income from UK land or property, you may need to complete the UK property section of the Self Assessment tax return. HMRC states that SA105 is used where a taxpayer receives rental income and other receipts from UK land or property.
Missing the correct section can delay your return or result in incomplete reporting.
5. Leaving everything until January
Waiting until the Self Assessment deadline can create stress, missing paperwork and rushed calculations. Landlords should keep records throughout the year, including rent statements, repair invoices, mortgage interest statements, insurance documents and letting agent statements.
This is especially important as Making Tax Digital for Income Tax is being introduced for landlords and sole traders in phases, depending on qualifying income. HMRC confirms that MTD for Income Tax starts from 6 April 2026 for those over £50,000, from 6 April 2027 for those over £30,000, and from 6 April 2028 for those over £20,000.
Need help with your landlord tax return?
Gondal Accountancy can help landlords prepare accurate Self Assessment tax returns, review rental income, organise expenses and prepare for MTD.
Disclaimer
The content of this blog is provided for general information purposes only and should not be treated as tax, accounting, legal or financial advice. Tax rules, accounting requirements, legislation, regulations and official guidance can be complex and may change over time. As a result, some information in this article may become outdated, incomplete or no longer applicable after the date of publication.
The application of any tax, accounting or legal rule will depend on your individual or business circumstances. Before making any decision or taking any action based on the information in this article, you should seek advice from a suitably qualified tax professional, accountant, solicitor or financial adviser.
Gondal Accountancy and its staff accept no responsibility or liability for any loss, action taken, or decision made or not made as a result of relying on the information contained in this blog.
