Yes. Nothing prevents you starting work before your Tax File Number arrives, and no employer can require it before hiring you. You have 28 days from your first day to supply it.
What is the 28 day rule, exactly?
The 28 days run from the day you start with that employer, not from the day you applied for your TFN and not from the day you arrived in Australia. During them, an employer holding a Tax File Number Declaration that records your application in progress withholds at the ordinary working holiday maker rate of 15%. If the 28 days lapse and no TFN has been supplied, they must withhold at 45% on every pay from then on.
The clock is per employer. Start at a Perth cafe in March and a packing shed near Shepparton in May, and each one starts its own 28 days and needs its own declaration form.
What does the declaration form actually do?
The Tax File Number Declaration decides your withholding rate. It is where you state that you are a working holiday maker, and where you either supply a TFN or record that you have applied for one. Payroll reads that form and applies the rate accordingly.
Showing a manager a photo of your TFN letter, or telling them the number verbally, does not change your pay. The rate follows the form. The residency box on that same form matters for the same reason: it decides your refund at the end of the year, and it is ticked wrong more often than any other item on the page.
Does the 45% apply to everything if you miss the window?
No. If the 28 days lapse, the higher rate applies to each subsequent pay in full. It is not applied retrospectively to pays you have already received, and no employer claws money back out of past wages.
Hand in the TFN and the correct rate resumes from the next pay run. The over-withheld portion from the gap is not fixed in payroll; it comes back through the ATO when your return is lodged, with anything else over-withheld that year.
What should you actually say to your employer on day one?
Say that your TFN application is in progress, offer the ATO confirmation email as evidence, and ask to complete the Tax File Number Declaration recording the application. Any hospitality or labour hire payroll office in Australia has had that conversation a hundred times.
The employers that get this wrong are not the large ones. Big hospitality groups and the labour hire firms that supply harvest work run this correctly by default. The gaps we see are small independent operators and single site farms, where payroll is one person doing it around everything else, and nobody notices that a rate is wrong until someone reads a payslip in June.
Do you need a TFN for anything else while you wait?
You can open an Australian bank account without a TFN and be paid into it. Your super fund is what should not be left unresolved. A fund without your TFN on file taxes contributions at a higher rate, cannot accept some contributions at all, and is harder to find later when you are claiming it.
Superannuation is paid on your wages from your first dollar regardless, at 12%, and a working holiday maker can claim your superannuation after leaving Australia. An account your fund cannot match to you is the most common reason people leave super behind.
How expensive is your own 28 day window?
The 28 day rule is identical for everyone, so the rule itself is never the variable. What differs is how much the window costs you, and that turns on five facts about your own start date and your own employers.
- Whether you applied before or after starting work. Applying first almost always means no 45% pay at all.
- Whether the declaration recorded the in progress application. Without that record the 45% starts immediately rather than after 28 days.
- Whether the address on your application holds mail for a month. Seasonal work moves people, and a returned letter restarts the wait past the 28 days.
- Whether your employer is ATO registered as a working holiday maker employer. If not, they withhold at foreign resident rates even with your TFN on file, which is a separate over-withholding you also get back.
- How many employers you had in the year. Each one is its own form and its own clock.
Any period withheld above 15% is money you claim back through your working holiday tax return, and you can estimate your tax refund before deciding anything.