Split-year treatment is one of the most valuable tax breaks when moving from UK to Australia. Get it right: save thousands. Miss it: pay UK tax on Australian salary for months you weren’t in UK.
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What Is Split-Year Treatment?
Normally, UK tax residency is all-or-nothing for entire tax year (April 6 – April 5).
Split-year treatment divides the tax year:
- Resident period: Start until departure
- Non-resident period: Departure until tax year end
Why it matters:
Without split-year:
- UK resident whole year = UK tax on worldwide income (including Australian salary)
With split-year:
- UK resident first part only
- Non-resident second part = UK tax only on UK-source income
Example:
- Move: October 1, 2026
- Australian salary: AUD 120,000/year (£66,000)
Without split-year:
- UK tax on full £66,000: ~£16,500
With split-year:
- UK tax on UK period only (6 months UK job)
- Australian months: £0 UK tax
- Saving: ~£8,000
Do You Qualify?
Must meet one of eight specific cases.
Most Common: Case 1 (Starting Full-Time Work Overseas)
Requirements:
- Start full-time work overseas
- Become non-UK resident following tax year
- No significant UK ties after departure
- Overseas employment continues
“Full-time work”: Average 35+ hours/week, no significant breaks.
Most Australia work visa holders qualify – standard employment contracts meet full-time definition.
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How to Claim
Claimed on UK Self Assessment tax return.
Step 1: Determine Split Point
Split date usually = day before you start overseas employment.
Example:
- Leave UK: September 28
- Start Australian job: October 1
- Split date: September 30
- Resident: April 6 – September 30
- Non-resident: October 1 – April 5
Step 2: File Tax Return
- Complete SA100
- Complete SA109 (residence supplement)
- Indicate split-year treatment
- Specify case and split date
Step 3: Supporting Evidence
HMRC may request:
- Australian employment contract
- Departure proof (flights)
- Australian visa
- Accommodation proof
Keep everything – HMRC can review for 6 years.
What Income Is Taxed When?
Resident Period (Pre-Split)
UK tax applies to:
- All worldwide income
- UK employment
- Any Australian income earned then
- Investments, rental income
Non-Resident Period (Post-Split)
UK tax applies to:
- UK-source income only (rental, UK pension)
UK tax does NOT apply to:
- Australian salary
- Foreign investment income
- Australian property rental
Common Complications
Starting Australian Job While in UK
Some negotiate remote work from UK before moving.
Problem: If employment “starts” in UK, Case 1 may not apply.
Solution: Ensure contract shows start date after Australian arrival.
UK Work During Non-Resident Period
Returning to UK for work after split date:
- Those earnings may be UK taxed
- Could jeopardize split-year claim if substantial
Keep UK work visits minimal (under 40 days) after split.
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Split-Year vs Full Year Non-Resident
They’re different:
Split-year: Part of year UK resident, claim relief from departure onwards.
Full year non-resident: Non-resident entire tax year. Only possible if left in previous tax year.
If you move October 2026, you cannot claim full year non-residence for 2026/27. You were UK resident April-September. Split-year is your relief.
Common Questions
Do I apply separately?
No. Claim on tax return for departure year.
Can I claim retrospectively?
Yes, within self-assessment deadlines (31 January following year).
What if HMRC denies?
Can appeal. Common reasons: not meeting full-time work test, insufficient evidence, wrong case.
Does it guarantee non-residence in following years?
No. Each year assessed separately under Statutory Residence Test.
Key Mistakes
1. Not claiming when eligible
Most common. People assume binary residence and overpay.
2. Claiming wrong case
Leads to HMRC rejections.
3. Insufficient documentation
No proof when HMRC asks.
4. Starting overseas employment “early”
Remote work from UK before moving can disqualify.
5. Assuming automatic qualification
Has strict criteria.
Disclaimer
This guide provides general information only and does not constitute tax advice. Split-year treatment rules depend on individual circumstances. Always consult qualified tax advisor before claiming split-year treatment.