PAYG Withholding

PAYG withholding is the income tax your employer withholds from every pay and sends to the ATO before the money reaches you. It is why your payslip says one number and your bank account says another.

TaxLast reviewed 2026-10-02

What it is

Pay As You Go withholding is the tax system's pay-as-you-earn mechanism. Your employer estimates the tax on each pay using the ATO's withholding tables and sends it to the tax office before the net amount lands in your account. The estimate is calibrated on the TFN declaration you file on day one. It assumes the job is your only income, with the tax-free threshold applied to it. The withholding is not the final tax - it is a prepayment, reconciled when you lodge the return.

The reconciliation is where the refund or the bill comes from. If the year's actual deductions reduce the real tax below what was withheld, the ATO refunds the difference: your own money, returned. If you have a second job or rental income that was never withheld on, the reconciliation can run the other way and produce a bill. Fair Work's payslip rules require the withholding to be shown as a line item, which is why the number is visible on every pay.

Key takeaways

PAYG withholding is the tax your employer sends to the ATO from each pay before you are paid.
The estimate is calibrated on the TFN declaration and assumes one job with the tax-free threshold.
The withholding is a prepayment - the return reconciles it and produces the refund or the bill.
A tax refund is your own money coming back, not a bonus.
A second job has no tax-free threshold, so its withholding runs from the first dollar.

How it works

The mechanics start on day one. The TFN declaration tells payroll your tax file number, residency and whether to claim the tax-free threshold, and the ATO's withholding tables convert each gross pay into a withholding amount. On a $100,000 salary the annual tax and Medicare levy is roughly $22,500, so the weekly withholding lands near $433 and the payslip shows $1,919 gross and $1,486 net. The take-home pay calculator runs the same tables on any salary and pay cycle.

The reconciliation runs at tax time. On the same $100,000 salary with $8,000 of negatively geared property deductions, the taxable income drops to $92,000 and the real tax falls to roughly $19,960 - while roughly $22,500 was withheld. The refund is about $2,500: your own money, returned. The same arithmetic runs in reverse on a second job or rental income, where nothing was withheld and the reconciliation produces a bill.

The variation is the lever when the estimate is systematically wrong. A PAYG withholding variation tells the ATO that your deductions or other income will shift the real tax, and payroll adjusts the withholding so the cash flow arrives through the year instead of as a July refund. It does not change the tax owed - only its timing - and it needs the variation form approved before the withholding changes. The marginal tax rate entry covers the rates the tables are built on.

Why it matters

For an Australian reader, the withholding is the biggest line on the payslip and the most misunderstood. It is an estimate calibrated on a form filed on day one, which is why the refund exists at all. The estimate is deliberately cautious, the return is the truth, and the difference comes back in July. Fair Work's payslip requirements make the line visible every pay. The ATO publishes its withholding tables so the estimate can be checked - the take-home pay calculator runs them on any salary.

A colleague named Brent (yes, that Brent) treated his $3,000 refund as a bonus and spent it every July, for years. The refund was his own money, withheld too aggressively through the year and returned without interest. It was an interest-free loan to the tax office, repaid annually. The highest-leverage thing most Australians can do is treat the withholding as a prepayment to be tuned. Check it against the real tax once a year, lodge a variation when the estimate is systematically wrong, and let the cash flow arrive through the year.

Real-world examples

$100,000 salary: the weekly withholding arithmetic

The annual tax and Medicare levy on $100,000 is roughly $22,500, so the weekly withholding is about $433. The payslip shows $1,919 gross and $1,486 net, and the gap is the tax arriving at the ATO before the account. The estimate assumes the tax-free threshold applies to this job and there is no other income. Both are assumptions the return will test, which is why the reconciliation exists. The take-home pay calculator runs the same tables on any salary and pay cycle.

The refund reconciliation with negative gearing

The same salary with $8,000 of negatively geared deductions drops the taxable income to $92,000 and the real tax to roughly $19,960. Roughly $22,500 was withheld, so the refund is about $2,500 - your own money, returned without interest. The withholding tables never knew about the property; the return did. The gap is the reconciliation doing its job, and it arrives in July or never. A PAYG variation would have delivered the same $2,500 through the year instead, which is the timing lever.

The second-job trap

The tax-free threshold is claimed on one job only. The second job's withholding table assumes none, so tax is withheld from the first dollar at a higher rate. The trap runs the other way: claim the threshold on both jobs - the box on the second form - and the reconciliation bills the under-withholding at tax time. The threshold was applied twice, and the shortfall is the difference. The second job is the income the tables were never told about, and the bill is the annual correction.

Common mistakes

Mistake: Treating the refund as a bonus.

Why it bites you: The refund is your own money, withheld too aggressively and returned without interest. Brent spent his every July; the tax office held the loan interest-free all year.

Mistake: Claiming the tax-free threshold on two jobs.

Why it bites you: The threshold applies once, on the job with the highest pay. Claiming it twice under-withholds through the year and bills the shortfall at reconciliation.

Mistake: Assuming the withholding is the final tax.

Why it bites you: The withholding is an estimate calibrated on the TFN declaration; the return reconciles it. Rental income, second jobs and large deductions all move the real tax away from the estimate.

Mistake: Lodging the TFN declaration late.

Why it bites you: Without it, the employer withholds at the top marginal rate from the first dollar. The form takes five minutes; the over-withholding lasts until the refund in July.

Ivy's take

I spent an evening reconciling a year of payslips against the ATO's withholding tables and my actual return so you don't have to. The withholding was within a hundred dollars of the real tax, which means the estimate machinery works. It also means the refund people wait for in July was their own money all along, held for a year at zero percent. I have since tuned my withholding with a variation and the July event has stopped, which is the entire point.

Brent celebrated his refund annually. The celebration was a loan repayment from an institution that charges no interest on the way in and pays none on the way back. The withholding is a prepayment, not a bill and not a bonus. Check it once a year against the real tax, vary it when it is systematically wrong, and let the money arrive on payday where it belongs.

Related jargon, defined

TFN declaration: The day-one form that calibrates the withholding - tax file number, residency, tax-free threshold.
Tax-free threshold: The first $18,200 of income, claimed on one job only.
Withholding tables: The ATO's published tables converting each gross pay into a withholding amount.
PAYG variation: The ATO-approved adjustment to withholding when the estimate is systematically wrong.
Reconciliation: The return's comparison of withheld tax against real tax - the source of the refund or the bill.
Assessable income: The income the return taxes after deductions - what the withholding estimated.

Frequently asked questions

What is PAYG withholding on my payslip?+

It is the income tax your employer withholds from each pay and sends to the ATO before the net amount reaches you. The estimate is calibrated on your TFN declaration and reconciled when you lodge the return.

Why is my tax refund smaller or larger than last year?+

Because the refund is the gap between what was withheld and the real tax, and both sides move. Deductions, second jobs, rental income and salary changes all shift the reconciliation in either direction.

Can I get my PAYG withholding adjusted?+

Yes, through a PAYG withholding variation: the ATO approves an adjusted rate when deductions or other income mean the standard estimate is systematically wrong. It changes the timing of the cash flow, not the tax owed.

Should I claim the tax-free threshold on a second job?+

No. The threshold is claimed once, on the job with the highest pay, and the second job's withholding assumes none. Claiming it twice under-withholds through the year and produces a bill at reconciliation.

Why did I get a tax bill instead of a refund?+

Because more income arrived without withholding than the estimate assumed: a second job, rental income, or investment income. The return reconciles the real tax against what was withheld, and the gap becomes a bill when the withholding fell short.

Disclaimer: This information is general in nature and does not constitute financial or legal advice. Always consult a qualified professional for your specific situation.

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