Thirty cents in every dollar, for as long as it lasts. With a TFN on file your employer withholds 15%; without one they must withhold 45%. On $1,000 a week that is $300 going to the ATO instead of your account, and on a $25 an hour job it is about $7.50 an hour.
Why does your employer take 45% and not 15%?
Your employer has no discretion. Australian tax law requires an employer who does not hold an employee's Tax File Number to withhold at the top marginal rate of 45%, and an employer who ignores that is the one exposed to the ATO. The 15% working holiday maker rate is unlocked by a document, not by a visa.
That document is the Tax File Number Declaration. Handing over your visa, your passport or a photo of your TFN letter in a group chat does not do it. Until the declaration is with payroll, the system applies the rate it is legally required to apply.
What does 45% withholding actually cost you?
The gap between the two rates is 30 percentage points, so do the arithmetic on your own wage rather than a generic one. Below are the weekly differences at wages realistic for full time seasonal and hospitality work.
- $800 a week: $120 withheld at 15% against $360 at 45%, a difference of $240
- $1,000 a week: $150 against $450, a difference of $300
- $1,500 a week: $225 against $675, a difference of $450
- $2,000 a week: $300 against $900, a difference of $600
A month of full time farm work in the Bundaberg or Mildura seasons at those rates is comfortably four figures of over-withholding.
Do you get the money back?
Yes.
Over-withheld tax is not a penalty and it is not lost. When your return is lodged the ATO works out what you owed across the financial year and refunds the difference to an Australian bank account. For most people who spent months at the wrong rate, that refund is the largest single payment of their year in Australia.
What you lose is access to the money in the meantime. Paying hostel rent week to week, several months without $300 a week is a genuine problem even though the ledger balances in the end. That is why fixing the declaration is worth more per hour than most of the shifts it affects.
How do you stop it?
Give your employer a completed Tax File Number Declaration carrying your TFN. The correct rate applies from the next pay run. Your employer will not go back and re-run earlier pays at 15%, and is not required to; the earlier over-withholding is corrected by the ATO at tax time, not by payroll.
If your application is still in progress, record that on the declaration. An employer who has that on file applies the working holiday maker rate through the 28 day window instead of 45%, which usually means you never see a high pay at all.
What decides how long you sit at 45%?
Four things decide how long the higher rate lasts, and none of them is the ATO being slow. That is why the period varies so widely between people who applied on the same day.
Whether you told your employer the application was in progress. The declaration records it, and that record is what carries the working holiday rate through the 28 day window.
Whether your postal address was right on the application. Your TFN arrives as a letter. A wrong address is the most common cause of a delay past 28 days by a wide margin, and every extra week is another week at 45%.
Whether your employer is registered with the ATO as a working holiday maker employer. An unregistered employer must withhold at foreign resident rates even once your TFN is on file. That is a separate over-withholding, not your mistake, and it also comes back at tax time. Check the payslip percentage rather than assuming the TFN fixed everything.
How many employers you had. Each employer needs its own declaration. Giving your TFN to the packing shed does not give it to the pub, and a common pattern is one job correctly at 15% and another quietly running at 45% for two months.
Does this apply to cash in hand work?
Cash work sits outside this rule because there is usually no payroll applying a rate at all, a different and larger problem. Wages paid in cash are legal only where tax is still withheld and super is still paid, and where neither happens you have no withholding to reclaim and no income statement to lodge from.
If some of your year was cash, that income still belongs on your return. How it was paid changes what evidence is needed, not whether it is declared. See cash in hand work in Australia for what that means in practice.
Can you claim the money back before the end of the year?
Usually you wait for the end of the financial year on 30 June. The exception that matters for working holiday makers is leaving Australia permanently: if you are departing and will not earn Australian income again that year, an early return can be lodged before 30 June.
Whether that is the right move depends on your residency position for the year, whether you have super to claim at the same time, and whether any employer is still to issue a final income statement. You can estimate your tax refund first, and a period at 45% is exactly the situation where the estimate and the final figure diverge most.