Landlord Tax Return UK: A Complete Guide (2026/27)
If you rent out property in the UK, tax responsibilities come with the territory — and the rules have shifted meaningfully over the past couple of years. This guide from Filing Accounts UK covers what landlords need to know for 2026/27, using only verified facts from official HMRC guidance.
At Filing Accounts, we file Self Assessment returns for landlords across the UK. Official guidance is available at GOV.UK: Renting out your property.
Do You Need to File a Tax Return?
You must declare rental income via Self Assessment if your gross rental income exceeds the £1,000 property income allowance in a tax year. This applies whether you let a single flat or manage a full portfolio, and covers UK and foreign property, furnished holiday lettings, and short-term lets. Non-resident landlords receiving UK rental income while living abroad must also register and file, under the Non-Resident Landlord Scheme.
Rental income is reported on the SA105 supplementary pages, filed alongside your main SA100 Self Assessment return.
Key Deadlines for 2025/26 Returns
| Submission Type | Deadline |
|---|---|
| Register for Self Assessment (if new) | 5 October 2026 |
| Paper tax return | 31 October 2026 |
| Online tax return and payment | 31 January 2027 |
Missing the online deadline triggers an automatic £100 penalty, even where no tax is ultimately owed, with further penalties the longer a return remains outstanding.
What Counts as Rental Income
- Rent from residential or commercial tenants
- Premiums for lease assignments or extensions
- Income from furnished holiday lettings
- Other letting-related payments, such as key money or cleaning charges passed to tenants
Allowable Expenses
- Property repairs and maintenance (not improvements — these are usually capital costs instead)
- Letting agent and property management fees
- Utility bills and council tax, where paid by the landlord
- Landlord insurance premiums
- Legal, accounting, and service charge costs
Mortgage Interest: The Restricted Relief Rule
For residential landlords, mortgage interest can no longer be deducted as a straightforward expense. Instead, relief is given as a 20% tax credit against your rental profits, rather than a deduction from income before tax — a change that has increased the effective tax rate for many higher-rate landlords with mortgaged properties. This restriction doesn’t apply to furnished holiday lettings or commercial property.
Making Tax Digital: Now Live for Larger Landlords
Since 6 April 2026, landlords with qualifying gross income (from property and/or self-employment combined) over £50,000 must follow Making Tax Digital for Income Tax rather than filing a traditional annual return — keeping digital records and submitting quarterly updates instead. This threshold drops to £30,000 from April 2027 and £20,000 from April 2028, so it’s worth checking your position each year even if you’re not affected yet.
Non-Resident Landlords
If you live outside the UK but receive UK rental income, the Non-Resident Landlord Scheme applies. Your letting agent or tenant may need to withhold basic rate tax from rent payments unless you’ve applied to receive rent gross. You must still register with HMRC and file a Self Assessment return declaring your full rental income, which is also how you’d reclaim any tax over-withheld.
Landlord Tax at a Glance
| Item | Detail |
|---|---|
| Reporting threshold | Over £1,000 gross rental income/year |
| Forms | SA100 + SA105 |
| Filing deadline | 31 January (online) |
| Mortgage interest relief | 20% tax credit only, not a full deduction |
| MTD threshold (2026/27) | Over £50,000 qualifying income |
| Non-resident landlords | Must register for NRL Scheme and file Self Assessment |
Common Mistakes to Avoid
Deducting Full Mortgage Interest as an Expense
Residential mortgage interest only gets 20% tax credit relief, not a full deduction — a common and costly error.
Confusing Repairs With Improvements
Repairing something already there is an allowable expense; improving or replacing it with something better is usually a capital cost treated differently.
Ignoring the Non-Resident Landlord Scheme
Landlords who move abroad often forget this obligation continues to apply to their UK property income.
Frequently Asked Questions
Do I need to file a tax return for rental income under £1,000?
Not usually, thanks to the property income allowance — though you may still need to file if you’re claiming expenses or have other reasons to file.
Can I deduct my full mortgage interest?
No, for residential lets. You get a 20% tax credit on mortgage interest instead of deducting it from your rental income.
Does Making Tax Digital apply to landlords?
Yes, if your qualifying income exceeds £50,000 for 2026/27, dropping to £30,000 in 2027/28 and £20,000 in 2028/29.
Need Help With Your Landlord Tax Return? Talk to Filing Accounts UK
At Filing Accounts, we help landlords file accurate Self Assessment returns, apply mortgage interest relief correctly, and prepare for Making Tax Digital where it applies.
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