Self assessment for landlords is one of the areas where we see the most overpaid tax and the most costly mistakes. Whether you let a single flat in Uxbridge, a family home in Hayes or a small portfolio across Hillingdon, the way you report your rental income to HMRC directly affects how much tax you pay. Getting self assessment for landlords right starts with knowing the rules.
Rules for landlords have changed a lot in recent years. Mortgage interest relief has been restricted, the furnished holiday lettings regime has ended and Making Tax Digital is now live for higher earning landlords. This guide explains what you need to know for your 2025/26 tax return, due by 31 January 2027, and why filing early with a specialist landlord accountant is the smartest move you can make this season.
Who Needs Self Assessment for Landlords?
In most cases, almost every landlord does. If you receive rental income in the UK, you generally need to tell HMRC. If your gross rental income is above £1,000 in the tax year, you will usually need to complete a Self Assessment tax return and the property pages (SA105).
This applies whether you are:
- A full time landlord with several properties
- An accidental landlord renting out a former home
- Renting a room in your home above the Rent a Room limit of £7,500
- A joint owner of a property with a spouse, partner or family member
- A UK resident with property overseas
Our landlord accountants can confirm how self assessment for landlords applies to you in a short call.
How Rental Profit Is Calculated
Understanding profit is the foundation of self assessment for landlords. You do not pay tax on all the rent you receive. You pay tax on your rental profit, which is your rental income minus allowable expenses. Getting the expenses right is where self assessment for landlords really pays off.
Allowable Expenses Landlords Can Claim
- Letting agent and management fees
- Repairs and maintenance, such as fixing a boiler, repainting or replacing broken windows
- Landlord insurance
- Ground rent and service charges
- Council tax and utility bills if you pay them
- Accountancy fees and legal fees for lettings
- Gas safety certificates, EICRs and EPCs
- Advertising for tenants
- Travel to your rental property for business purposes
- Replacement of domestic items such as furniture, white goods and carpets, on a like for like basis
Costs that improve a property, such as an extension or a loft conversion, are capital costs. They cannot be deducted from rental income, but they may reduce Capital Gains Tax when you sell. HMRC explains the rules in its guidance on working out your rental income.
The £1,000 Property Allowance
If your rental income is small, you may use the £1,000 property allowance instead of claiming actual expenses. For most landlords with a mortgage and running costs, claiming real expenses gives a better result. We compare both options for you. This choice is one of the simplest wins in self assessment for landlords.
Mortgage Interest and Section 24 Explained
Mortgage interest is the single biggest change to self assessment for landlords in the last decade. Individual landlords can no longer deduct mortgage interest from rental income. Instead, you receive a tax credit worth 20% of your finance costs. For basic rate taxpayers this often makes little difference, but higher and additional rate landlords can face a much larger bill than they expect.
Section 24 can also push landlords into a higher tax band, affect Child Benefit through the High Income Child Benefit Charge and reduce their personal allowance once income passes £100,000. This is why planning matters. Our specialist tax advice service in Uxbridge reviews ownership structures, income splitting with a spouse and whether a limited company could suit your future purchases.
Jointly Owned Property
If you own a property jointly with your spouse or civil partner, rental profit is normally split 50/50 for tax. If you own it in unequal shares and want the profit taxed according to your actual ownership, you can file a declaration with HMRC using Form 17. For couples where one partner pays a lower rate of tax, this can create a real saving.
Unmarried joint owners are generally taxed according to their agreed share of the profits. Ownership is an area of self assessment for landlords where a short conversation can save real money.
The End of Furnished Holiday Lettings
From 6 April 2025 the special tax treatment for furnished holiday lettings was abolished. That means 2025/26 is the first tax year where holiday lets are taxed in the same way as other residential lettings. Finance costs are now restricted, capital allowances have changed and some reliefs on sale are no longer available. If you run a holiday let or serviced accommodation, your 2025/26 return needs careful attention. Self assessment for landlords with holiday lets is now very different from previous years.
Selling a Rental Property? Do Not Forget the 60 Day Rule
If you sold a UK residential property during the tax year and made a gain, you must report it and pay Capital Gains Tax within 60 days of completion using HMRC’s separate property reporting service. The gain must then also appear on your Self Assessment tax return. Rates for residential property are 18% for basic rate taxpayers and 24% for higher and additional rate taxpayers. Late reporting brings penalties and interest, so speak to us before you complete a sale. Capital gains are often the most overlooked part of self assessment for landlords.
Making Tax Digital for Landlords
Making Tax Digital is changing self assessment for landlords for good. Making Tax Digital for Income Tax started on 6 April 2026 for landlords and sole traders with qualifying income above £50,000. Qualifying income is your total gross rental and self employment income, not your profit. From April 2027 the threshold falls to £30,000, and to £20,000 from April 2028.
If you fall into scope, you must keep digital records and send quarterly updates to HMRC. Our MTD Income Tax accountants set up the right software and handle submissions for you, while our bookkeeping service in Uxbridge keeps your rental records tidy all year round.
Should You Move Your Properties Into a Limited Company?
Many landlords ask whether a property company would save tax. Companies can deduct mortgage interest in full and pay Corporation Tax rather than Income Tax. However, transferring existing properties can trigger Capital Gains Tax and Stamp Duty Land Tax, and lenders treat company mortgages differently. It is a decision that should be made with proper numbers in front of you. If it suits your plans, our company formation service can set everything up correctly. Whatever you decide, self assessment for landlords will still apply to any properties you keep in your own name.
Why Uxbridge Landlords File Early With NS Accounting
Self assessment for landlords is rarely simple, and leaving it until January means less time to gather agent statements, mortgage interest certificates and repair invoices. When you file early with NS Accounting, you get:
- A full review of every allowable expense
- Correct treatment of mortgage interest under Section 24
- Advice on joint ownership and income splitting
- Your tax bill confirmed weeks before the 31 January deadline
- Peace of mind that your return is accurate if HMRC ever asks questions
We support landlords across Uxbridge, Hillingdon, Hayes, West Drayton, Ruislip, Ickenham and the wider West London area, as well as clients across the UK.
Get Expert Help With Your Landlord Tax Return
Do not let rental income become a source of stress this January. Speak to our Self Assessment accountants today and get your 2025/26 return filed early and accurately.
Call: 020 3744 0046
WhatsApp: 07584 660731
Email: info@nsaccounting.co.uk
Contact form: Contact NS Accounting online
