Payslip · Guide

STSL on your payslip, and what it is not

Four letters, no explanation, and a number that does not match anything you can find. Here is what the line is, where it goes, and why it is not the same as what you actually repay.

ATO withholding rules · verified

Rules and figures verified 2 Sept 2026 against the official sources — how we check.

The short answer

STSL is Study and Training Support Loan. It is extra tax your employer withholds because you told them you have a study loan. It is added to your ordinary PAYG withholding — and it is an estimate of your repayment, not the repayment itself.

Two things follow that surprise people, and both are covered below: the money does not reach your loan until your tax return is assessed, and the amount withheld is very unlikely to be exactly what you owe.

It covers more than HECS

STSL is the umbrella term for every debt repaid through the tax system, which is why the acronym is deliberately vague. When you answered “yes” on a tax file number declaration or a withholding declaration, you were answering for all of these:

Higher Education Loan Program (HELP)
VET Student Loan (VSL)
Financial Supplement (FS)
Student Start-up Loan (SSL), including ABSTUDY SSL
Australian Apprenticeship Support Loan (AASL)

They share one set of thresholds and one rate scale, so your employer does not need to know which one you hold. If HECS-HELP is your only debt, STSL on your payslip means HECS.

You may not see it at all

Before hunting for the line, know that it does not have to be there. The ATO’s position is explicit: the amount withheld for a compulsory repayment may not be listed separately and can simply sit inside the total PAYG withholding figure.

Whether it is broken out is a decision your payroll software made, not a legal requirement. So a missing STSL line proves nothing, and a present one is not an extra deduction on top of your tax — it is part of the tax already coming out.

Where the number comes from

Your employer looks your earnings up in a table the ATO publishes for weekly, fortnightly and monthly pay, and adds the result to your normal withholding. The tables track the annual repayment scale closely, which is easy to check on the ATO’s own published example.

The ATO's worked example of a weekly STSL component, reconciled against the annual scale
Step	Figure
Weekly earnings, cents ignored	$1,816
STSL component the ATO's table gives	$72 a week
The same pay across a year	$94,432
Annual repayment on that income	$3,735.60
Which is, per week	$71.84

The table rounds to whole dollars, so it lands a few cents above the annual scale. That tiny gap is the whole idea of withholding in miniature: near enough each pay, reconciled exactly at the end.

Why it started on your second job first

This is the question that brings most people here, and the answer is the tax-free threshold rather than anything about your loan. Withholding begins at different points depending on whether you have claimed it:

Weekly earnings at which STSL withholding begins
Your situation	STSL starts at	Which is, a year
Claiming the tax-free threshold	$1,337 a week	$69,524
Not claiming it, as on a second job	$987 a week	$51,324

You normally claim the threshold with one employer only. The second one therefore withholds on the assumption that its pay is stacked on top of income it cannot see, and that assumption starts biting at a far lower weekly figure. Both employers are following the rules correctly, and neither knows the other exists.

There is also one situation where nothing is withheld regardless: No STSL is withheld where the payee has lodged a Medicare levy variation declaration claiming a reduction or exemption because of a spouse or dependants and low family income.

What it is withheld from, and what it is not

All earnings, including taxable allowances, bonuses and commissions. That includes the parts of your pay that vary most, which is a large part of why the annual reconciliation rarely lands on zero.

Lump sum termination payments — no STSL component is withheld from them at all. That one is worth carrying with you. The taxable part of a termination payment still counts as income when your repayment is worked out at assessment, but nothing was collected against it during the year. A large redundancy payout can therefore produce a study loan bill in the same year you lost the job — not a reason to panic, but a good reason not to spend all of it.

It is not your repayment, and it is not on your loan yet

Two separate misunderstandings, and between them they explain most of the confusion about this line.

It is an estimate. The table assumes every pay looks like the one in front of it. Your real repayment is calculated once, on your whole year, when your return is assessed. Steady income and the two are close. Overtime, a bonus, a mid-year start, or two jobs and they separate.

And it has not touched your loan. The ATO holds it as tax withheld, along with the rest of your PAYG, and only applies it to the balance once the return is lodged and a compulsory repayment is worked out. That is why your balance can sit unchanged for months while money leaves every payslip — the guide to checking your balance covers what you are looking at when you go in and find nothing has moved.

If you want the figure the withholding is aiming at, the HECS repayment calculator works out the actual annual repayment from your income, and projects when the balance clears.

When it should stop

Not automatically. Your employer withholds because you told them to, and they have no way of knowing your balance has reached zero. Completing a new withholding declaration is what ends it. Until you do, the extra keeps coming out and returns to you as part of your refund, which costs you nothing but the use of the money in the meantime.

Frequently asked questions

Why is it called STSL and not HECS?

Because the acronym is doing a job. Your employer is told there is a debt, never which one — the declaration asks a single yes-or-no question covering every kind, and they all repay on the same scale at the same thresholds, so nothing about the withholding changes with the answer. A generic label is the only one that works, and it keeps a detail out of payroll that payroll has no need for. The side effect is that your payslip greets you with an abbreviation nobody has ever said out loud, describing a debt you have only ever heard called HECS.

Why is there no STSL line on my payslip?

Because there does not have to be one. The ATO says plainly that the amount withheld for a compulsory repayment may not be listed separately — it can simply sit inside the total PAYG withholding figure. Whether you see it depends entirely on what your payroll software chooses to display. So its absence is not evidence that nothing is being withheld, and its presence is not a special deduction; it is one component of the tax already coming out.

Why did STSL start coming out of my second job?

Because of the tax-free threshold, not because you started earning more overall. Weekly withholding begins at $1,337 for someone claiming the threshold and at just $987 for someone who is not. You normally claim it with one employer only, so a second job is assessed on that lower figure and can have STSL withheld while your main job has none. Both employers are following the rules; neither can see the other.

Is the STSL amount the same as my repayment?

Rarely exactly. It is a per-pay estimate produced by a table that assumes every pay looks like this one. Your actual repayment is worked out once, on your whole year, when your return is assessed. Steady income and the two land close together. Overtime, a bonus, a pay rise, part of a year worked, or more than one job and they drift apart — which is why a study loan is a common reason for an unexpected refund or bill even when nothing about your job changed.

Nothing was withheld from my redundancy payout. Is that wrong?

No, that is the rule: no STSL component is withheld from a lump sum termination payment. It is worth knowing rather than filing away, because the taxable part of that payment still counts as income when your repayment is worked out at assessment. Nothing was collected against it during the year, so a large payout can produce a study loan bill in a year you also lost your job. Not a reason to panic, but a reason not to spend the whole payout.

I have paid my loan off. Why is STSL still coming out?

Because your employer only knows what you told them. They withhold because you ticked the box on a declaration, and they keep doing it until you tell them otherwise by completing a new withholding declaration. Until then the money keeps coming out and comes back as part of your refund — an interest-free loan to the ATO, with the paperwork to end it sitting on your desk rather than theirs.

Where this comes from

ATO — Study and training loan indexation rates — ATO page last updated 2026-04-17.
ATO — Compulsory repayments — ATO page last updated 2026-06-03.
ATO — Voluntary repayments — ATO page last updated 2025-11-06.
ATO — Study and training loan repayment thresholds and rates — ATO page last updated 2026-06-30.
ATO — View your study loan account online — ATO page last updated 2026-06-03.
ATO — Study and training support loans weekly tax table — ATO page last updated 2026-06-17.

The withholding thresholds and the worked example above are read from a dated file citing the ATO’s own tax table, and a test reconciles that example against the annual repayment scale, so a mistyped figure fails the build. We are not the ATO and cannot see your payslip or your account; this explains what you are looking at. General information only — not financial or tax advice.

Check the highlighted field — we can’t use that value, so the figures below are the last ones that worked.