Am I a tax resident of Australia or the country I'm working in?

It depends on how long you stay and where your "domicile" sits. As a rough rule, if you spend more than 183 days in a country you are usually a tax resident there. For your Aussie tax, the ATO uses a four-factor test (resides, domicile, 183-day, super) rather than a single rule.

Do I need to file a tax return in both countries?

Usually yes. Australia taxes worldwide income of Australian residents, and most WHV countries tax income earned within their borders. Double-tax treaties prevent you from being taxed twice on the same dollar; you claim a foreign income tax offset on your Australian return for tax already paid overseas.

Can I claim back tax I paid overseas when I leave?

In several countries yes. UK PAYE and Irish PAYE often over-withhold during your first months; you can claim a refund after leaving. Japan has a 20% departure tax credit available for resident taxpayers. Canada lets you file a final-year return that often produces a refund.

Working holiday visa tax basics (Australia, UK, Ireland, Canada, Japan)

Tax is the boring part of a gap year and the thing that catches most working-holiday makers out. The good news: most WHV countries process online tax returns in English and refund overpaid tax once you leave. The not-so-good news: the rate WHV-holders pay is often higher than the rate a resident pays for the same income.

Australia, for inbound WHV makers (subclass 417 and 462)

Australia taxes working holiday makers at a flat 15% on the first $45,000, then standard resident rates above that. You must apply for a Tax File Number once you arrive; without one, your employer must withhold at the 45% no-TFN rate. Source: ATO working holiday makers.

The 15% rate is a flat rate, not marginal. You do not get the $18,200 tax-free threshold available to residents. This often surprises Australians who hire WHV staff and assume the same withholding tables apply.

United Kingdom Youth Mobility Scheme

YMS visa-holders are taxed as UK residents from day one. Standard PAYE rates apply: personal allowance of GBP 12,570, then 20% basic rate to GBP 50,270, 40% higher rate to GBP 125,140, 45% additional rate above.

National Insurance (NI) is a separate payroll tax of about 8% on wages between GBP 12,570 and GBP 50,270, plus 2% above. Your NI number takes 4-8 weeks to issue; employers can withhold at emergency rates until it lands.

You will probably overpay during the first six months because PAYE assumes a full tax year and you arrived part-way through. File a refund via HMRC's online portal after the tax year ends (5 April). Most YMS leavers get GBP 800-2,000 back.

Source: gov.uk income tax rates and HMRC working in the UK.

Ireland Working Holiday Authorisation

Ireland's PAYE works similarly to the UK's. WHA-holders are taxed as residents from day one. Income tax brackets: 20% on the first EUR 42,000, then 40% above. On top of PAYE, the Universal Social Charge (USC) takes 0.5% to 8% depending on income, and PRSI (social insurance) takes 4%.

The PPS number (Ireland's tax file number) takes 4-12 weeks. Employers can withhold at emergency rates of 40% until your number is issued. File for the refund of overpaid emergency tax after the year ends via the Revenue Online Service.

Source: Revenue.ie jobs and pensions.

Canada International Experience Canada (IEC)

Canada uses federal plus provincial tax brackets, so the rate depends on where you live. Federal rates run 15% to 33%; provincial rates add another 5% to 25%. Total marginal rates of 25% to 50% are normal.

IEC-holders are usually classified as residents for tax purposes if they stay more than 183 days. You must file a T1 General return each year; many WHV-holders get a refund because their employer's payroll system assumed a full year of income.

Source: Canada Revenue Agency.

Japan Working Holiday Visa

Japan taxes WHV-holders as non-permanent residents. Income tax is progressive from 5% to 45%; the 10% local "resident tax" is added the following year. Many WHV-holders leave before the resident tax bill arrives, which can cause issues if you re-enter Japan later.

If you are in Japan less than 12 months, you are typically classified as a non-resident and taxed at a flat 20.42% on Japan-source income. Source: National Tax Agency.

What to do, in order, when you start a WHV job overseas

Apply for the local tax number (NI number in UK, PPS in Ireland, SIN in Canada, MyNumber in Japan). Get the application started in your first week.
Give your employer the number once received and ask them to switch you from emergency to standard tax code.
Open a local bank account and have your wage paid into it; tax authorities prefer to refund into a local account.
Keep payslips for the whole period; you will need them when you file the return.
File a tax return before you leave the country. Most countries accept online filing from overseas.

What to declare on your Australian tax return

If you remain an Australian tax resident (the most common case for short gap years), declare your worldwide income on the Australian return. Claim a foreign income tax offset for tax already paid overseas. The Australia-UK, Australia-Ireland, Australia-Canada and Australia-Japan double-tax treaties all prevent you from being taxed twice on the same dollar.

If you became a non-resident for Australian tax purposes during the gap year, the rules change: Australia only taxes Australian-source income, but the capital-gains and HECS-HELP rules become more complex. See a registered tax agent before claiming non-residency, because the bar is higher than most people assume.

HECS-HELP repayment calculator
Tax-free threshold explainer (Australian-resident basics)
Currency converter and FX fees
United Kingdom WHV summary
Canada IEC summary

ExamExplained does not provide financial, tax or migration advice. The figures above are stable foreign-country headline rates; you must check the live source before relying on them. For your circumstances, see a registered Australian tax agent and the relevant foreign tax authority.