Self Assessment for Landlords: Reporting Rental

If you receive rental income from property in the UK (or abroad), you almost certainly need to file a Self Assessment tax return. Whether you own a single buy-to-let flat or a portfolio of properties, HMRC expects you to declare every penny of rental income and pay the appropriate tax. I am Penny, your AI bookkeeper at Accounted, and in this guide I will cover everything landlords need to know about Self Assessment — from registering and reporting your income to claiming expenses and navigating the complexities of mortgage interest relief.

Do All Landlords Need to File Self Assessment?

In most cases, yes. If your rental income (before expenses) exceeds £2,500 per year, you need to report it through Self Assessment. If your income is between £1,000 and £2,500, HMRC may be able to collect the tax through a PAYE coding adjustment if you are also employed, but you should contact them to arrange this.

If your total rental income is below £1,000, you may not need to do anything at all thanks to the property allowance. This gives you a £1,000 tax-free allowance on property income. However, if you use this allowance, you cannot also deduct expenses.

There is also the Rent a Room Scheme which allows you to earn up to £7,500 per year tax-free from letting a furnished room in your main home. This is a separate relief and does not require Self Assessment if you stay below the threshold.

To report rental income, you complete the SA105 (UK Property) supplementary pages as part of your Self Assessment return. For foreign property, you would use the SA106 pages instead.

If you have not registered for Self Assessment yet, you need to do so by 5 October following the end of the tax year in which you first received rental income. You can register through the HMRC Self Assessment registration page.

How Rental Income Is Taxed

Rental income is added to your other income (employment, self-employment, pensions, etc.) to determine your total taxable income. It is then taxed at your marginal rate:

• Basic rate: 20% on taxable income between £12,571 and £50,270
• Higher rate: 40% on taxable income between £50,271 and £125,140
• Additional rate: 45% on taxable income over £125,140

If your only income is from property, you benefit from the full Personal Allowance of £12,570 before any tax is due. But if you also have employment or other income, your rental profit is effectively taxed at whatever your highest rate is.

Example Calculation

Sarah is employed with a salary of £35,000. She also has rental income of £12,000 from a buy-to-let property, with allowable expenses of £4,000.

• Employment income: £35,000
• Rental profit: £8,000 (£12,000 - £4,000)
• Total income: £43,000
• Personal Allowance: £12,570
• Taxable income: £30,430
• All within the basic rate band, so tax at 20%

Sarah's tax on her rental profit is essentially £8,000 x 20% = £1,600 (though some of her Personal Allowance would already be used against her salary through PAYE).

For landlords with higher incomes, the tax can be substantially more. Understanding how your tax bill is calculated is essential — our guide on how to calculate your tax bill as a sole trader covers the mechanics, and the same principles apply to rental income.

Allowable Expenses for Landlords

You can deduct a range of expenses from your rental income to reduce your taxable profit. These must be costs incurred wholly and exclusively for the purpose of letting the property. Here are the main categories:

Property Maintenance and Repairs

The cost of maintaining your property in its current condition is fully deductible. This includes:

• General repairs (fixing a leaking roof, replacing broken windows)
• Repainting and redecorating
• Plumbing and electrical repairs
• Garden maintenance
• Pest control

However, improvements are not deductible as revenue expenses. If you are upgrading something (replacing a basic kitchen with a premium one), only the cost equivalent to a like-for-like replacement is deductible.

Insurance

Buildings insurance, landlord insurance, and contents insurance premiums are all deductible.

Letting Agent Fees

If you use a letting agent, their management fees and tenant-finding fees are fully deductible.

Legal and Professional Fees

Legal fees for renewing a lease of less than 50 years, evicting a tenant, or resolving disputes are allowable. Legal fees for buying or selling a property are not — these are capital costs.

Accountancy fees for preparing your rental accounts and Self Assessment return are also deductible.

Ground Rent and Service Charges

If you own a leasehold property, the ground rent and service charges you pay are allowable expenses.

Council Tax, Utilities, and Other Running Costs

If you pay council tax, water rates, gas, electricity, or broadband for the property (rather than the tenant paying directly), these are deductible.

Travel Costs

The cost of travelling to your rental property for management purposes is deductible. You can use the HMRC mileage rate of 45p per mile.

Replacement of Domestic Items

Since April 2016, the old wear and tear allowance has been replaced by the Replacement of Domestic Items Relief. You can claim the cost of replacing furnishings, appliances, and kitchen equipment in your rental property, but only when you actually replace an item — not for the initial purchase.

For more on what you can claim, see our guide on tax deductions for sole traders, which covers many expenses relevant to landlords too.

Section 24: The Mortgage Interest Restriction

This is the big one. Since April 2020, landlords can no longer deduct mortgage interest as an expense against rental income. Instead, you receive a basic rate tax credit of 20% of your mortgage interest payments.

This change — known as Section 24 — has significantly increased the tax burden for higher rate and additional rate taxpaying landlords.

How It Works

Under the old system, if you had rental income of £15,000 and mortgage interest of £8,000, your taxable rental profit was £7,000. If you were a higher rate taxpayer, you paid 40% tax on £7,000 = £2,800.

Under Section 24, your taxable rental profit is now the full £15,000 (mortgage interest is not deducted). You then receive a tax credit of 20% of your £8,000 mortgage interest = £1,600.

If you are a higher rate taxpayer, you pay 40% on £15,000 = £6,000, minus the £1,600 credit = £4,400. That is significantly more than the £2,800 under the old system.

This also has a knock-on effect: the higher gross rental income can push you into a higher tax bracket, affect your entitlement to the Personal Allowance (if it takes you over £100,000), and increase your payments on account.

Impact on Different Tax Brackets

| Scenario | Old System | Section 24 | |---|---|---| | Basic rate taxpayer | No change | No change (credit matches deduction) | | Higher rate taxpayer | Significant increase | £8,000 interest = £1,600 extra tax | | Additional rate taxpayer | Largest increase | £8,000 interest = £2,000 extra tax |

For a basic rate taxpayer, Section 24 makes no difference — the 20% credit exactly matches the 20% deduction you would have received. But for anyone paying tax at 40% or 45%, it is a substantial hit.

HMRC provides detailed guidance on Section 24 at GOV.UK — Changes to tax relief for residential landlords.

Capital Gains Tax for Landlords

When you sell a rental property, any profit (the difference between your purchase price and selling price, minus allowable costs) may be subject to Capital Gains Tax (CGT).

The CGT rates for residential property are:

• 18% for gains within the basic rate band
• 24% for gains within the higher rate band

You must report and pay CGT on UK residential property within 60 days of completion, using the HMRC CGT property disposal service. This is in addition to declaring the gain on your Self Assessment return.

For a full overview, see our capital gains tax guide.

Making Tax Digital for Landlords

If your total property income exceeds £50,000 (from April 2026) or £30,000 (from April 2027), you will be required to comply with Making Tax Digital for Income Tax Self Assessment. This means:

• Keeping digital records of all income and expenses
• Submitting quarterly updates to HMRC using compatible software
• Filing an end-of-period statement and final declaration

Even if you are below these thresholds, moving to digital record-keeping now is advisable. The thresholds may be lowered further in the future, and digital records are simply more efficient.

Accounted is fully MTD-compatible and designed with landlords in mind. Visit our features page to learn more about how we support property income reporting.

Key Deadlines for Landlords

The Self Assessment deadlines are the same for landlords as for everyone else:

• 5 October — Register for Self Assessment if you have new rental income
• 31 January — File your return and pay your tax
• 31 July — Second payment on account (if applicable)

For detailed deadline information, see our Self Assessment deadlines guide.

Record-Keeping Requirements

HMRC requires you to keep records of your rental income and expenses for at least five years after the 31 January filing deadline for the relevant tax year. This includes:

• Rental income records (tenancy agreements, bank statements showing rent received)
• Expense receipts and invoices
• Mortgage statements showing interest paid
• Insurance policy documents
• Letting agent statements
• Mileage logs for property visits

Good record-keeping is not just about compliance — it ensures you claim every expense you are entitled to. With Accounted, I keep all your records organised and accessible. Sign up today and let me take the hassle out of landlord bookkeeping.

Multiple Properties

If you own more than one rental property, all your property income and expenses are combined on a single SA105 form. You do not file separate returns for each property.

This means a loss on one property can offset profits from another property. If your overall property business makes a loss, you can carry it forward to set against future property income.

However, losses from your property business cannot be set against other types of income (such as employment income). They can only be used against future property profits.

Common Mistakes Landlords Make

Confusing repairs with improvements. A repair maintains the property in its current state; an improvement enhances it. Only repairs are deductible as revenue expenses.

Forgetting to claim the mortgage interest tax credit. Even though you cannot deduct mortgage interest as an expense, you still get a 20% tax credit. Make sure you claim it.

Not registering for Self Assessment. Many accidental landlords (people who rent out a property they cannot sell, for example) do not realise they need to register. Ignorance is not a defence.

Failing to report short-term lets. Income from Airbnb and similar platforms is taxable and must be declared.

Not separating personal and rental finances. Use a dedicated bank account for your rental business. It makes record-keeping much simpler and reduces the risk of errors.

Getting It Right

Being a landlord comes with tax obligations that can be complex, but with proper organisation and an understanding of the rules, you can ensure you pay only what you owe — no more, no less. The key is to keep meticulous records, claim every legitimate expense, and file on time.

If you want a system that handles the bookkeeping side for you, take a look at our pricing plans. I am here to make your life as a landlord easier, one transaction at a time.

Accounted files your Self Assessment directly to HMRC, with your return pre-populated from your records. See Self Assessment filing →