Becoming a landlord often happens unexpectedly. You might inherit a property, move in with a partner and rent out your flat, or decide to invest in buy-to-let. Whatever your route, one thing becomes unavoidable very quickly: landlord tax.
Once you receive rental income, HMRC expects you to declare it correctly. That means understanding Self Assessment, and more specifically, the SA105 and SA106 forms. For many landlords, this is where confusion starts.
This guide walks you through the landlord tax journey step by step—what you need to file, which forms apply, and how to stay compliant while avoiding common (and costly) mistakes.
- Your Tax Obligations as a UK Landlord
If you earn income from renting out property, HMRC requires you to report it via a Self Assessment tax return.
This applies whether you:
- Rent out a single property or multiple properties
- Let a room or an entire home
- Earn a profit or make a loss
For landlords, the standard tax return (SA100) must be supported by supplementary pages, depending on the type and location of your property income.
The two most common forms are:
- SA105 – UK Property Income
- SA106 – Foreign Income
- SA105 Explained: Declaring UK Rental Income
The SA105 form is essential for landlords with UK property income. It is where HMRC expects you to report income and expenses from property located in the UK.
You’ll use SA105 if you earn income from:
- Residential buy-to-let properties
- UK holiday lets
- Commercial property
- Renting out rooms above the Rent a Room threshold
What You Report on SA105
On the SA105, you’ll:
- Declare gross rental income for the tax year
- Deduct allowable expenses
- Calculate your taxable rental profit (or loss)
Example
If you rent out a flat for £1,200 per month:
- Annual rent: £14,400
- Expenses (agent fees, insurance, repairs): £4,000
- Taxable profit: £10,400
That profit is added to your other income and taxed at your marginal rate.
Accuracy matters. Errors, omissions, or incorrect expense claims can trigger penalties or HMRC enquiries.
- Allowable Expenses and Landlord Tax Reliefs
One of the biggest opportunities for landlords is reducing tax legally by claiming the right expenses.
Common Allowable Expenses on SA105
- Letting agent and management fees
- Property repairs and maintenance
- Buildings and contents insurance
- Council tax and utilities (if paid by you)
- Legal and accountancy fees related to letting
- Replacement of domestic items (like-for-like)
What You Cannot Deduct
- Capital improvements (e.g. extensions, luxury upgrades)
- Personal expenses
- Your own time or labour
The distinction between repairs vs improvements is critical. Claiming incorrectly can result in HMRC penalties—or paying more tax than necessary.
Good record-keeping is essential. Keep invoices, receipts, and bank statements for at least 6 years.
- SA106 Explained: When Foreign Income Is Involved
If you’re a UK resident landlord with overseas income, you’ll also need to complete SA106 – Foreign Income.
SA106 applies if you receive:
- Rental income from foreign property
- Foreign dividends or interest
- Overseas income connected to your property business
Avoiding Double Taxation
If you’ve already paid tax abroad, SA106 allows you to claim Foreign Tax Credit Relief, so you’re not taxed twice on the same income.
Example
You own a holiday apartment in Spain:
- Tax paid in Spain
- Income must still be declared in the UK
- SA106 allows you to offset Spanish tax against your UK liability
This is an area where mistakes are common—and costly—especially for landlords with international property portfolios.
- Making Tax Digital (MTD) and Landlords
Making Tax Digital for Income Tax (MTD ITSA) is changing how landlords report income.
Key points:
- Mandatory from April 2026 for landlords with income over £50,000
- From April 2028 for income over £20,000
- Requires:
- Digital record-keeping
- Quarterly submissions
- HMRC-approved software
If you already file online or use accounting software, you’re ahead of the curve. If not, now is the time to prepare.
- Common Landlord Tax Mistakes to Avoid
Many HMRC penalties arise from avoidable errors, including:
- Missing the 31 January Self Assessment deadline
- Claiming personal expenses as rental costs
- Forgetting part-year rental income
- Misclassifying furnished holiday lets
- Failing to declare overseas property income
HMRC now uses data from letting agents, land registries, and banks to identify undeclared rental income.
- Never Filed Before? What to Do Now
If you’ve earned rental income and never told HMRC, you’re not alone—and it’s not too late.
You should:
- Register for Self Assessment immediately
- Disclose previous rental income
- Use HMRC’s Let Property Campaign if needed
Voluntary disclosure usually results in lower penalties than waiting for HMRC to contact you.
- How to File Your Landlord Tax Return
Here’s a simple filing checklist:
- Log into your HMRC online account
- Complete SA100 (main return)
- Add SA105 for UK property income
- Add SA106 if you have foreign income
- Review figures carefully
- Submit by 31 January
- Pay any tax due by the same deadline
Once submitted, HMRC will issue a tax calculation confirming what you owe or are due to repay.
- When to Get Professional Help
You should consider professional support if:
- You own multiple properties
- You rent property overseas
- You’re unsure about expenses
- You’re filing late or amending returns
A specialist can ensure your SA105 and SA106 are accurate, compliant, and tax-efficient—often saving more than their fee.
Final Thoughts: Landlord Tax Is Part of Smart Ownership
Filing landlord tax correctly isn’t just about compliance. It’s about:
- Understanding your investment performance
- Protecting yourself from penalties
- Maximising your returns legally
With clear knowledge of SA105 and SA106, accurate records, and the right support, tax season doesn’t have to be stressful.
Being a landlord is about building long-term wealth—and filing your tax return properly is part of that foundation.
Understanding the SA109 Form for Non-Residents
If you live outside the UK but earn income here, you may still be required to file a UK Self-Assessment tax return. In many cases, this includes completing the SA109 form, which tells HMRC about your residency status, split-year position, and remittance basis claims.
The SA109 is one of the most important — and most misunderstood — parts of UK tax for non-residents, expats, and internationally mobile individuals. Getting it wrong can result in overpaying tax, losing allowances, or HMRC penalties.
This guide explains what the SA109 form is, who needs to file it, and how to submit it correctly.
What Is the SA109 Form?
The SA109 is a supplementary form that forms part of your UK Self-Assessment tax return (SA100). It is used to report:
- Your UK tax residency status
- Whether you are non-UK resident
- Whether split year treatment applies
- Whether you are claiming the remittance basis
- Eligibility for UK personal allowances
- Overseas workday relief (OWR), where applicable
If you are non-resident — or became resident or left the UK part-way through the tax year — the SA109 is usually required.
Why UK Residency Matters for Tax
Your UK tax position depends on where you are resident for tax purposes.
If You Are UK Resident
You are normally taxed on your worldwide income, including:
- Overseas rental income
- Foreign employment income
- Overseas dividends and interest
If You Are Non-UK Resident
You are generally taxed only on UK-source income, such as:
- UK rental income
- UK employment duties
- UK pensions
- Certain UK capital gains
The SA109 is how you formally declare this to HMRC.
Are You a UK Resident or Non-Resident?
UK residency is determined using the Statutory Residence Test (SRT), which applies for each tax year (6 April to 5 April).
You May Be Non-UK Resident If:
- You spent fewer than 16 days in the UK (if previously resident)
- You spent fewer than 46 days in the UK (if not resident in the previous 3 years)
- You worked full-time overseas and:
- Spent fewer than 91 days in the UK
- Worked no more than 31 UK workdays
You Are UK Resident If:
- You spent 183 days or more in the UK, or
- You have a UK home and spend significant time here, or
- You work full-time in the UK
Your residency outcome must be reported accurately on the SA109.
Who Needs to File an SA109?
You will usually need to submit an SA109 if you:
- Are non-UK resident but receive UK income
- Became UK resident or left the UK during the tax year (split year)
- Are UK resident but non-domiciled and claiming the remittance basis
- Have foreign income or capital gains
- Are eligible for Overseas Workday Relief (OWR)
- Were prevented from leaving the UK due to COVID-19 travel restrictions
What Does the SA109 Do?
The SA109 allows you to:
- Confirm non-resident tax status
- Claim UK personal allowances (where eligible)
- Apply split year treatment
- Use the remittance basis correctly
- Avoid double taxation
- Ensure HMRC taxes only the income they are entitled to
Without an SA109, HMRC may incorrectly treat you as fully UK resident.
SA109 vs R43 – What’s the Difference?
- Form R43 is used to claim personal allowances or refunds without filing a tax return
- SA109 is used as part of a Self-Assessment return
If you are filing Self-Assessment, you usually do not need R43.
How Do You Submit the SA109?
The SA109 cannot be submitted through HMRC’s standard online Self-Assessment system.
To file an SA109 online, you must use HMRC-approved tax software.
Our UK-based accounting practice handles the full process for you:
- SA100 + SA109 preparation
- Residency and split-year analysis
- Foreign income reporting
- Digital submission to HMRC
This ensures accuracy, compliance, and peace of mind.
Tips for a Successful SA109 Submission
- Check calculations carefully – errors can trigger penalties
- Pay tax by 31 January to avoid interest
- Keep records for at least 6 years
- Ensure residency status is supported by evidence
Many SA109 errors arise from incorrect residency assumptions — professional review is strongly recommended.
Key Deadlines
- 31 January – Online filing deadline
- 31 January – Tax payment deadline
Late filings can result in automatic penalties.
How We Can Help
We specialise in UK non-resident Self-Assessment tax returns, including SA109 filings.
We help clients:
Determine residency correctly Apply split-year treatment Claim allowances and reliefs Avoid overpaying UK tax Submit fully compliant returns to HMRC
Speak to our tax specialists today for help with your SA109 and non-resident tax return.
FAQs: SA109 & Non-Resident UK Tax
Do non-residents need to file a UK tax return?
Yes — if you receive UK income or gains, you may need to file a non-resident Self-Assessment tax return with an SA109.
Are non-residents taxed on foreign income?
No. Non-residents are usually taxed only on UK-source income.
Can I submit the SA109 directly to HMRC?
No. The SA109 must be submitted using HMRC-approved software.
What happens if I don’t file an SA109?
HMRC may tax you as a UK resident, leading to higher tax bills, penalties, or enquiries.
