If you rent out a property, whether it is a second home, a flat you inherited, or a room in your own house, you need to know when HMRC expects to hear about it. The rules are not complicated, but the consequences of ignoring them can be.
HMRC has significantly improved its ability to identify undisclosed rental income in recent years, through data sharing with letting agencies, land registry records, and bank information. Assuming they will not notice is not a strategy worth relying on.
This guide covers when you need to declare rental income, what counts as income, and how the reporting thresholds work.
Quick Answer
You must tell HMRC about rental income if your total rental profit exceeds £1,000 in a tax year (the property income allowance). If your rental income is between £1,000 and £2,500, you may be able to arrange collection through PAYE. Above £2,500, you must file a Self Assessment tax return. Failure to disclose can result in penalties and interest going back several years.
The Property Income Allowance
Every individual has a £1,000 property income allowance each tax year. If your total gross rental income (before expenses) is £1,000 or less, you do not need to tell HMRC and no tax is due.
This is a gross income test, not a profit test. If you earn £1,200 in rent but have £500 of allowable expenses, you still need to declare it because the gross income exceeds £1,000, even though the profit is only £700.
The allowance applies per person, not per property. If you jointly own a rental property with your partner, each of you has their own £1,000 allowance against their share of the income.
Different Thresholds, Different Rules
Gross income under £1,000
No declaration needed. You benefit from the full property income allowance and no tax is due.
Gross income between £1,000 and £2,500
You need to tell HMRC, but you may not need to file a full Self Assessment return. HMRC can sometimes collect the tax owed through an adjustment to your PAYE tax code, if you are employed or receive a pension. You would need to contact HMRC directly to arrange this.
Gross income between £2,500 and £10,000 (with other untaxed income below £2,500)
You must file a Self Assessment return.
Gross income over £10,000, or if you have other reasons to file Self Assessment
A Self Assessment return is required regardless of other income sources. This applies to most landlords with a meaningful rental portfolio.
What Counts as Rental Income?
Rental income includes:
- Rent from residential or commercial property
- Payments for the use of furnished rooms
- Payments under a holiday let arrangement (different rules apply, see below)
- Ground rent and service charges you collect and retain
- Premiums received on the grant of a short lease
It does not include:
- Deposits held in trust (until they are retained from the tenant)
- Reimbursement of utility bills by the tenant (where you receive exactly what you pay out)
The Rent a Room Scheme
If you let a furnished room in your own home (the home you live in), the Rent a Room scheme may apply. Under this scheme, the first £7,500 of gross income from furnished room lettings is completely tax-free. You do not need to declare it.
If your income from letting a room in your own home exceeds £7,500, you must report the excess. You can choose whether to claim the scheme (taxing only the excess over £7,500) or declare actual income minus actual expenses.
The Rent a Room scheme only applies to your main home. It does not apply to a second property, even if you occasionally stay there.
What Expenses Can You Deduct?
Allowable expenses reduce your taxable rental profit. They include:
- Letting agent fees
- Maintenance and repairs (not improvements)
- Buildings and contents insurance
- Mortgage interest (at basic rate relief only, following Section 24 changes)
- Ground rent and service charges you pay
- Accountancy fees
- Council tax and utilities (where you pay them, not the tenant)
- Advertising costs
Capital improvements, such as an extension or a new kitchen, are not deductible as expenses but may reduce a Capital Gains Tax liability when you eventually sell.
Making Tax Digital and Rental Income
From April 2026, landlords with gross rental income over £50,000 will be required to keep digital records and submit quarterly updates to HMRC under Making Tax Digital for Income Tax (MTD for ITSA). The threshold drops to £30,000 from April 2027.
If this affects you, you will need compatible software and a new way of managing your records. Planning ahead is sensible, as the transition requires some preparation.
What Happens If You Have Not Told HMRC?
HMRC runs regular campaigns targeting undisclosed rental income. If they identify rental income you have not declared, they can open an investigation and charge:
- Tax on undisclosed profits going back up to four years (up to 20 years in serious cases)
- Interest on unpaid tax
- Penalties ranging from 0% to 100% of the tax owed, depending on whether the failure was innocent, careless, or deliberate
The most effective way to address an undisclosed rental income issue is through a voluntary disclosure before HMRC contacts you. Penalties are significantly lower for unprompted disclosures.
Frequently Asked Questions
I only rented my property for a few months. Do I still need to declare it? Yes, if the gross rent exceeds £1,000 in the tax year. There is no minimum period. Even short-term lets through platforms like Airbnb count as rental income and must be declared.
My rental income is split with my spouse. How does this work? Jointly owned property income is normally split 50/50 for tax purposes. If you own it in different proportions and wish to be taxed accordingly, you can file form 17 with HMRC to declare the actual ownership split. Each person then declares their share on their own return.
Do I need to tell HMRC even if I made a loss? Yes. Rental losses can be carried forward and set against future rental profits. To preserve this right, you should still file a return and declare the loss even if no tax is owed.
Can I deduct the cost of furnishing a property? If it is a residential furnished letting, you can claim a replacement of domestic items relief for replacing items like furniture, appliances and kitchenware. You cannot claim for the initial furnishing of a property.
What is the deadline for telling HMRC about rental income? You must register for Self Assessment by 5 October following the end of the tax year in which the rental income arose. For 2024/25 rental income, the deadline to register is 5 October 2025.
Ready to Get Your Rental Tax in Order?
Sat Bhatti is an ACCA and ATT qualified tax specialist and HMRC Registered Agent with over 25 years’ personal tax experience. Whether you are a first-time landlord unsure where to start or an experienced property investor looking for reliable annual returns, Kent Tax Specialists can handle your landlord tax return efficiently.
We work with landlords across Gravesend, Dartford, Medway, Maidstone, Sevenoaks, Tonbridge, Tunbridge Wells and the wider Kent area. Get in touch today for a fixed-fee quote.
Also see: Landlord Tax Return in Gravesend | Landlord Tax Return Services | What Expenses Can Landlords Claim on Their Tax Return?
