Key takeaways
- The TFN declaration (NAT 3092) goes to a new payer. The withholding declaration (NAT 3093) changes your settings with an existing payer.
- Three settings drive the withholding: the tax-free threshold claim, the study loan (HELP) flag, and residency.
- No TFN provided within 28 days of starting: the employer must withhold 47% from every dollar (45% for foreign residents).
- Claim the tax-free threshold with one employer only, normally the one paying you the most.
- You can complete the declaration on paper, through ATO online services in myGov, or in your employer's payroll software.
- A withholding declaration can only be given to a payer who already holds your TFN declaration.
What the TFN declaration sets
The form looks administrative, but each question maps directly to a withholding setting in your employer's payroll system.
The tax-free threshold claim. Answer yes and the first $18,200 of the 2026-27 year comes through with no tax withheld, spread across your pays. Answer no and withholding starts from the first dollar. Only one employer at a time should hold your yes; a second job claims nothing, which is why second-job pays are taxed harder. The full logic, including which job should carry the claim, is in the tax-free threshold guide.
The study loan flag. Ticking the HELP/study loan box tells the employer to add a loan repayment component to withholding once your pay is high enough. Leave it unticked with a debt outstanding and nothing is put aside, and the whole compulsory repayment lands as a bill at your return.
Residency status. Residents get the tax-free threshold and the resident scale; foreign residents are withheld from the first dollar at higher rates. Working holiday makers have their own scale again. Answering this wrongly produces the largest errors of the three.
How to complete and lodge it
There are three paths, all ending in the same payroll settings:
Ways to complete the TFN declaration
- Paper form (NAT 3092) handed to the employer, who reports the details to the ATO
- Online through ATO online services in myGov, then give the printed summary to the employer
- Directly in the employer's payroll or onboarding software, which lodges it electronically
What the form is not
- Not a TFN application: you need a TFN before you can declare it
- Not a one-off for life: each new payer needs its own declaration
- Not the way to change details later: that is the withholding declaration
No TFN after 28 days: the 47% rule
You can start work before quoting a TFN, but the grace period is 28 days. After that, the employer has no choice: withholding jumps to 47% of every dollar for residents, 45% for foreign residents, with no tax-free threshold and no brackets. On a $1,500 week that is $705 gone instead of roughly $298. The money is not lost, it comes back at assessment once the TFN is on file and the return is lodged, but it is a brutal cash-flow hit that a five-minute form avoids. You can see the difference on your own pay with the PAYG withholding calculator, which includes the no-TFN scale.
TFN declaration vs withholding declaration
The two forms are constantly confused because both talk about withholding. The split is simple: the TFN declaration opens the relationship with a payer, the withholding declaration amends it.
| TFN declaration | Withholding declaration | |
|---|---|---|
| Form | NAT 3092 | NAT 3093 |
| When | Starting with a new payer | Changing details with an existing payer |
| Typical triggers | New job, new payer, first job | Claiming or dropping the tax-free threshold, a new or repaid study loan, residency change |
| Prerequisite | A tax file number | A TFN declaration already held by that payer |
| Lodgment | Paper, ATO online services, or employer software | Given to the payer, who adjusts withholding from that point |
When to lodge a withholding declaration
Any time the three settings drift out of date. The common cases: you pick up a second job and want to move the tax-free threshold claim to the higher-paying one; you finish paying off a HELP debt and want the loan component of withholding switched off rather than donating an interest-free loan to the ATO until July; a new study loan starts; or your residency position changes mid-year. Each of these is a tick-box change on the NAT 3093, and the payer applies it from the next pay run.
Where the information ends up
The declaration details flow into Single Touch Payroll reporting, and everything the employer withholds on the strength of them is reported to the ATO each pay day. At year end the totals appear in your income statement in myGov, pre-filled into your return. If withholding ran on wrong declaration settings all year, the income statement is where the damage shows up. The income statement guide covers how to read it and when it becomes tax ready.
Frequently asked questions
Do I fill out a TFN declaration for every job?
What happens if I never provide my TFN?
What is a withholding declaration?
Should I claim the tax-free threshold on a second job?
I paid off my HECS. How do I stop the extra withholding?
Is the TFN declaration the same as applying for a TFN?
Sources
- ATO: Tax file number declaration (NAT 3092)
- ATO: Withholding declaration (NAT 3093)
Related resources
PAYG Withholding
The system your declaration settings feed into
Open →Income Statements
Where your withholding totals land in myGov
Open →PAYG Withholding Calculator
Withholding with and without the threshold or a TFN
Open →
Narelle Hartigan is a CPA-qualified tax accountant with over a decade of experience in Australian personal taxation and payroll. She founded PAYG Calculator Australia to make tax withholding easy for every Australian worker to understand.