Filing Your First Tax Return as a Landlord
A step-by-step guide to filing your first Self Assessment tax return as a UK landlord. From registration to submission, with SA105 property pages explained.
Key Actions
- Register for Self Assessment by 5 October after your first tax year with rental income
- Gather your rental income and expense records
- Complete the SA105 property pages alongside your main SA100 return
- File online by 31 January and pay any tax owed
- Set up a system for ongoing record keeping
Filing a tax return for the first time as a landlord can feel daunting, but the process is more straightforward than it looks. This guide walks you through each step — from registering with HMRC to submitting your return — so you know exactly what to expect.
If you're unsure whether you need to file at all, check our guide on when rental income is taxable first.
Step 1: Register for Self Assessment
If you've never filed a Self Assessment return before, you need to register with HMRC.
Deadline: Register by 5 October after the end of the tax year in which you first received rental income.
Example: You start renting out a property in September 2025 (tax year 2025/26). Register by 5 October 2026.
How to Register
- Go to GOV.UK: Register for Self Assessment
- You'll need a Government Gateway account — create one if you don't have it
- Select that you have income from property
- Complete the registration form
After registering, HMRC will send you a Unique Taxpayer Reference (UTR) — a 10-digit number. This usually arrives within 10 working days by post. You'll need it to file your return.
Already registered for Self Assessment? If you file returns for self-employment and now also have rental income, you don't need to register again. You just add the SA105 property pages to your existing return.
Step 2: Gather Your Records
Before you sit down to file, collect everything you'll need:
Income
- Total rent received during the tax year (6 April to 5 April)
- Any other property income (service charges, insurance payouts)
- If you use a letting agent, their annual statement summarises this
Expenses
- Mortgage annual statement (showing interest paid)
- Insurance premiums
- Repair and maintenance invoices
- Letting agent fees
- Utility bills (for periods you paid)
- Travel log for property visits
- Any replacement furniture or appliance receipts
Other Information
- Property address(es)
- Whether each property is furnished, part-furnished, or unfurnished
- Dates the property was available for letting
- Your UTR number
For a detailed breakdown of what to collect, see our landlord tax records checklist.
Step 3: Understand the SA105 Property Pages
When you file your Self Assessment return online, you'll complete the main SA100 form plus supplementary pages. For rental income, the relevant pages are the SA105 (UK property).
The SA105 has two main sections:
Section A: UK Property Income
This is where most landlords report. The key boxes are:
| Box | What to Enter |
|---|---|
| Total rents and other income | Gross rental income for the year |
| Tax taken off any income | Usually zero for private landlords |
| Premiums for the grant of a lease | Leave blank unless you granted a premium lease |
| Reverse premiums | Leave blank in most cases |
Section B: UK Property Expenses
| Box | What to Enter |
|---|---|
| Rent, rates, insurance, ground rents | Council tax (void periods), insurance, ground rent |
| Property repairs and maintenance | Repairs only — not improvements |
| Loan interest and other financial costs | Mortgage interest (reported here for the 20% tax credit calculation) |
| Legal, management and other professional fees | Agent fees, accountancy, legal costs for short leases |
| Cost of services provided | Gardening, cleaning, communal services |
| Other allowable property expenses | Travel, phone, advertising, replacement of domestic items |
The Result
The form calculates your net profit or loss from these figures. This is added to your other income on the main SA100 to determine your total tax bill.
Property Allowance Option
If your total rental income is £1,000 or less, you can use the property allowance instead of listing expenses. Tick the relevant box and enter your income — no expense details needed.
If your income exceeds £1,000 but your expenses are less than £1,000, you can still choose to use the property allowance (deducting £1,000 from your income) instead of claiming actual expenses. Compare both approaches to see which gives you a lower tax bill.
Step 4: File Your Return Online
When to File
| Method | Deadline |
|---|---|
| Paper return | 31 October after the tax year |
| Online return | 31 January after the tax year |
Most landlords file online — it's faster, you get an immediate confirmation, and the system calculates your tax automatically.
How to File
- Sign in to your HMRC online account at GOV.UK
- Start your return — select the relevant tax year
- Add the property pages — tick "UK property" when asked which sections apply to you
- Complete each section — the online form guides you through step by step
- Review your calculation — HMRC shows your tax bill before you submit
- Submit — you'll receive a confirmation with a reference number
You don't need to finish in one sitting. The online system saves your progress. You can return and continue whenever you're ready.
Step 5: Pay Your Tax
Tax is due by 31 January — the same deadline as filing.
Payment Methods
- Online banking — using your UTR as the reference
- HMRC app — quick for smaller amounts
- Direct Debit — set up through your HMRC account
- Debit card — through the HMRC online payment service
Important: Bank transfers can take up to 3 working days to reach HMRC. Pay by 25 January to allow processing time if using this method.
First Year: Watch for Payments on Account
If your tax bill exceeds £1,000, HMRC will ask for payments on account — two advance payments towards next year's tax. This means your first January payment could be 150% of your annual tax bill.
See our guide on payments on account for landlords for the full explanation.
Common First-Time Mistakes
Forgetting to include all income — if you have multiple properties, all UK rental income goes on one SA105. Don't submit separate forms for each property.
Claiming improvements as repairs — a new extension is not a repair. Only costs that restore the property to its previous condition are deductible. See our allowable expenses guide for the full breakdown.
Missing the registration deadline — if you don't register by 5 October, you may face a late registration penalty. HMRC is generally lenient with first-time landlords who register voluntarily, but don't leave it to chance.
Not claiming the mortgage interest credit — since Section 24, mortgage interest isn't deducted as an expense. It's entered on the SA105 and converted into a 20% tax credit. If you leave this box empty, you'll overpay.
Filing but not paying — filing your return on time avoids the late filing penalty, but you also need to pay by 31 January. Late payment attracts interest from day one.
Timeline for First-Time Landlords
Here's a complete timeline if you start renting in the 2025/26 tax year:
| Date | Action |
|---|---|
| 6 Apr 2025 – 5 Apr 2026 | Tax year — keep records of all income and expenses |
| 5 October 2026 | Deadline to register for Self Assessment |
| 6 April – 31 January 2027 | Complete and file your return online |
| 31 January 2027 | Pay your tax bill (plus first payment on account if over £1,000) |
| 31 July 2027 | Second payment on account (if applicable) |
Frequently Asked Questions
Do I need an accountant?
Not necessarily. If you have one or two properties with straightforward income and expenses, the online system is designed for you to complete it yourself. If you have complex arrangements (multiple properties, overseas income, partnerships), an accountant can be worthwhile.
What if I made a mistake on my return?
You can amend your return within 12 months of the original 31 January filing deadline. Sign in to your HMRC account and select the option to amend your return.
Can I file before the tax year ends?
No. You can only file after 5 April, when the tax year is complete. But you can start gathering records and organising your figures beforehand.
What if my rental property made a loss?
Report the loss on your SA105. You can carry it forward to offset against future rental profits from the same property business. You can't offset rental losses against other income (like employment).
This guide is for informational purposes only and does not constitute tax, legal, or financial advice. Tax rules change frequently. Always verify current requirements on GOV.UK or consult a qualified accountant for your specific situation.
Official Sources
- Register for Self Assessment — GOV.UK
- Self Assessment tax returns — GOV.UK
- File your Self Assessment tax return online — GOV.UK