Pay As You Go Instalments

Pay as you go instalments are how the ATO collects tax in advance on income that arrives without an employer docking tax first. If you freelance, run a side business, or draw serious dividends or rent, nobody is withholding PAYG on those dollars. Left alone, you would land a fat tax bill every June, which is bad for you and worse for the government's cash flow. PAYG instalments spread that bill across the year.

The ATO enters you into the system automatically, usually after you lodge a return showing instalment income above $4,000, tax payable above $1,000, and notional tax above $500. From then on you pay quarterly, either a fixed instalment amount the ATO calculates from your last return, or a percentage rate you apply to your actual income for the quarter.

Every instalment becomes a credit against your final tax assessment. Overpay and you get a refund. Underpay and you settle the difference at lodgement. The system is not a second tax; it is the same tax arriving in four smaller, less traumatic cheques.

Enrolment is automatic and retrospective. You lodge a return showing, say, $20,000 of side-business income and $4,500 of tax on it. The ATO notices, enrols you in PAYG instalments, and a notice appears in myGov telling you the quarterly amounts or your instalment rate. Nothing was applied for; the system recruits you.

There are two payment flavours. The instalment amount option gives you a fixed dollar figure each quarter, pre-calculated from your last return with a GDP uplift baked in, which suits stable income and people who hate arithmetic. The instalment rate option gives you a percentage, and you multiply it by your actual instalment income each quarter, which suits lumpy freelance income because a dead quarter means a small payment. Most individuals can switch between options inside myGov through their ATO online services.

Varying is permitted and common. If your income collapses mid-year, you lodge a variation estimating the year's real tax, and the quarterly figures shrink. The discipline is honesty: vary too low and your final assessment triggers interest on the shortfall. After lodgement each year, instalments paid are credited, and the ATO recalculates next year's amounts from the fresh return. Freelancers can sanity-check the quarterly set-aside with the freelancer pay calculator.

The first-year shock is legendary among new sole traders. You save nothing for tax all year, lodge your return, and receive a bill for last year's tax plus the first instalment toward next year's in the same quarter. That double-tap has ended more side hustles than market forces ever did.

A colleague named Brent (yes, that Brent) invoiced $38,000 of weekend consulting, spent all of it, and met the ATO in October with a $9,000 tax bill plus his first $2,800 instalment notice. He described this as the government taking him by surprise, which is technically accurate in the way weather surprises people who never look up. A 25% standing transfer to a separate account from day one would have covered all of it with money to spare for his emergency fund habit he never started either.

The highest-leverage habit is treating the ATO's estimates as advisory, not gospel. Check each quarter against your actual income in myGov, vary downward promptly when work dries up, and keep the set-aside in an offset or high-interest account earning something while it waits. The ATO's PAYG instalments pages spell out both options in decent plain English.