Filing a UK tax return from Australia: SA109, property, pensions & ATO rules
How to file a UK Self Assessment tax return from Australia: SA109 electronic filing, UK rental property, pension NT codes, and bridging the April vs June tax years.
Short answer: If you live in Australia and have UK rental property, UK workdays, or recently emigrated from Britain, you must file a UK Self Assessment tax return (SA100) with supplementary residence pages (SA109). Because HMRC's free Gov.uk portal blocks form SA109, you cannot submit it directly on the HMRC website. Matthew files your complete UK tax return electronically from our practice for a £295 fixed fee, claims your £12,570 UK Personal Allowance, and provides a clear schedule to claim Foreign Income Tax Offsets (FITO) on your Australian ATO return.
Key points
- HMRC's standard online portal blocks Form SA109; non-residents in Australia must use an authorised agent or commercial software to file online.
- The UK tax year runs from 6 April to 5 April, whereas the Australian ATO tax year runs from 1 July to 30 June.
- British citizens living in Australia retain the full £12,570 UK Personal Allowance (claimed on Box 16 of form SA109).
- Under the UK/Australia Double Taxation Agreement, UK tax paid on rental income can be credited as a Foreign Income Tax Offset (FITO) on your ATO return.
- UK pensions paid to Australian tax residents are generally taxable only in Australia under Article 17, allowing you to apply for an HMRC NT (Nil Tax) code.
- Matthew prepares and files your complete UK return and SA109 online in our fixed-fee £295 Non-Resident Package.
Why filing a UK tax return from Australia hits a roadblock on Gov.uk
Thousands of British expats and Australian residents sit down to file their UK Self Assessment return online, only to discover at the final hurdle that HMRC's free online portal does not support Form SA109 (the mandatory residence and split-year schedule).
Posting a paper return from Sydney, Melbourne, Perth, or Brisbane carries a strict 31 October deadline and risks postal delays that trigger automatic £100+ late penalties. Filing electronically through an authorised Chartered Tax Adviser extends your deadline to 31 January and provides instant HMRC receipt confirmation.
UK (HMRC) vs Australia (ATO) tax return alignment
| Tax Rule | United Kingdom (HMRC) | Australia (ATO) |
|---|---|---|
| Tax Year Dates | 6 April to 5 April | 1 July to 30 June |
| Online Filing Deadline | 31 January following tax year end | 31 October (or up to 15 May via registered tax agent) |
| UK Rental Income | Taxed first in UK via SA100 + SA105 + SA109 | Declared as foreign rent; UK tax credited via FITO |
| UK State & Private Pensions | Exempt from UK tax with HMRC NT code (Article 17) | Taxable in Australia as foreign pension income |
| UK Property Sale (CGT) | Mandatory HMRC report & payment within 60 days | Declared in AUD on ATO return with FITO credit for UK CGT |
UK rental property, NRL1 forms & Australian FITO credits
If you kept your former UK home or own UK buy-to-let property while living in Australia, your rental profits remain taxable first in the UK.
To prevent double taxation, the UK/Australia Double Taxation Convention allows you to claim a Foreign Income Tax Offset (FITO) on your Australian ATO return for UK tax paid. Matthew ensures you:
- Register under the Non-Resident Landlord Scheme (Form NRL1) so your letting agent pays gross rent without 20% withholding
- Claim your full £12,570 UK Personal Allowance on Box 16 of form SA109
- Deduct all allowable UK repairs, management fees, and Section 24 mortgage interest tax credits on form SA105
- Receive a clean UK tax computation to hand directly to your Australian accountant for your ATO return
UK pensions and the UK/Australia Double Tax Treaty
Under Article 17 of the UK/Australia Double Taxation Agreement, most UK State Pensions, private SIPPs, and company pensions paid to an Australian tax resident are taxable only in Australia.
If your UK pension provider is deducting 20% or 40% PAYE tax at source, Matthew can submit a treaty relief claim to obtain an NT (Nil Tax) code from HMRC and reclaim any overpaid UK tax.
File your UK tax return from Australia without HMRC hold queues...
Skip the 45-minute international phone queues and Gov.uk software blocks. Matthew (Chartered Tax Adviser) prepares and files your complete UK tax return and SA109 online for a transparent £295 fixed fee.
Written and reviewed by Matthew S Manderson CTA ATT AMIT
Chartered Tax Adviser (CTA), Association of Taxation Technicians (ATT), Association of Malta International Taxation (AMIT). General guidance only; tax treatment depends on individual facts.