Weekly Pay in Australia: Why the Tax Changes Week to Week

You worked the same job for the same employer two weeks running, and the two payslips do not match. The hours were close. The tax was not.

Almost everyone who gets paid weekly runs into this, and almost everyone assumes payroll made a mistake. Payroll usually did not. There is one rule behind most of it, and once you have seen the rule you can stop rechecking the arithmetic every Thursday night.

The rule that explains most of it

Your employer does not know what you will earn this year. Nobody does. Yet tax has to come out of every pay, so the system needs a way to guess.

The guess is deliberately simple. When your employer runs a weekly pay, they look up a table built for weekly pays. That table takes the amount in front of it and assumes every week of your year looks the same. Multiply this week by fifty two, treat the result as your yearly income, withhold at the rate that matches, move on.

Now put a week of overtime through it. The table does not know the overtime was unusual. It reads a bigger number, assumes a bigger year, and withholds at a rate meant for someone who earns that much every single week. Your tax for that week looks harsh because, for one week, you were treated as a higher earner.

The same machinery runs in reverse. Take unpaid leave, drop a shift, start a job partway through the week, and the table assumes a smaller year and withholds gently.

Neither week was calculated wrongly. Both were calculated on an assumption that was never true for you.

Where the real number gets settled

Withholding is a running estimate, not a final bill. At the end of the financial year your return adds up what you actually earned and what you actually owe. The weekly estimates get compared against that total. If the year had more overtime weeks than quiet ones, too much was withheld and the difference comes back. If it went the other way, you pay the shortfall.

This is the part worth holding on to. A single week that looks overtaxed does not need your attention. It is not lost, it is not a mistake, and chasing it will cost you an afternoon and change nothing. What deserves attention is the pattern across a run of payslips, which is a different question with a different answer.

The year with an extra payday

A year is a little longer than fifty two weeks. That leftover fraction piles up quietly until a financial year arrives with an extra weekly payday inside it.

Two things happen when that year comes around. Your bank account sees one more deposit than usual, which is pleasant and slightly misleading. And your withholding runs short, because each of those pays was taxed as one fifty second of a year while your employer handed you fifty three of them.

The gap is normally small. It is worth knowing about mainly so that a smaller than expected refund in one particular year does not send you hunting for an error that is not there. If you would rather not be surprised, you can ask your employer to withhold a little extra during that year, and payroll can set that up.

Super now moves with your pay

Superannuation used to travel on its own schedule. Your employer accrued it as you worked and sent it to your fund after the quarter closed, which meant the line on your payslip and the balance in your fund could disagree for months at a time.

Since the start of this financial year, super moves at the same time as your pay. Each time you are paid, the contribution for that pay goes out to your fund.

For weekly workers this is the largest practical change in years, and it changes nothing about the amount. The rate did not move. What moved is when the money lands, which matters if you have ever tried to work out whether contributions were actually being made.

It is easier to check now. Your fund should show contributions arriving through the year rather than in occasional lumps, so a fund that stays silent for a long stretch is a real signal rather than a normal wait.

Reading a weekly payslip

You are entitled to a payslip within one working day of being paid, on paper or electronically. Rather than reading it top to bottom, check the few lines that can actually be wrong.

Comparing one week against a fortnightly or monthly figure is where people usually go astray. Weekly tax comes from the weekly table, so the only fair comparison is another week.

The super line is the one people skip and the one most likely to be genuinely wrong, since it depends on your employer having your fund details right. Check the fund name, not only the amount.

What your yearly figure does and does not cover

Working the other way, from weekly pay back to a yearly figure, brings its own trap. Take your gross week, multiply by fifty two, and the answer will usually sit above the salary written in your contract.

That contract figure is base salary. Overtime, penalty rates, shift allowances and commissions are paid on top of it when they apply, and they arrive in whichever week they were earned. Annual leave loading is an extra amount paid while you are on leave, and not every employee gets it. Bonuses are taxed in the pay they turn up in, which is why a bonus week can look startling on its own.

Salary sacrifice pulls in the opposite direction, reducing the salary that gets taxed before the table ever sees it.

So a year built from a good week overstates your income and a year built from a quiet week understates it. If you want a yearly figure that means something, average several weeks that were genuinely ordinary, or work from the contract and treat the extras separately.

Putting a number on it

Everything above explains the shape of the answer rather than the amount. For the amount you need the rates in force right now, whether a study loan applies to you, and how super is handled in your particular arrangement. Rates change each financial year, so instead of printing them here we keep them in the calculator, where they get updated.