HECS repayment on $300,000

How $300,000 becomes $30,000.00

Worked in full: $300,000 × 10% = $30,000.00. That is the entire calculation for this band — no threshold subtracted first, no fixed amount added after. Every dollar of $300,000 is taxed at the same 10% rate for this purpose, including the first one.

Under the 2025-26 rules the repayment on $300,000 would have been identical: $30,000.00. The threshold moved between the two years but not by enough to change this particular figure.

Here is what a raise actually looks like on $300,000: the next dollar loses 45c to income tax, 2c to the Medicare levy, and 10c to HECS — 43.0c makes it to your bank account. That is the marginal rate on the next dollar, not the average rate on $300,000 as a whole; every dollar already earned kept more, because the earlier brackets charge less.

A $5,000 raise on $300,000 does not arrive whole. Income tax takes $2,250.00 of it, the Medicare levy $100.00, and HECS $500.00 more — $2,150.00 (43%) actually lands in the bank.

The 10% band at $300,000

At $300,000 you are in the top band, and it does not work like the others. Instead of a rate on the amount above a threshold, it applies 10% to your entire repayment income: $300,000 × 10% = $30,000.00. Every dollar is in scope, including the first ones. The two methods happen to land within about $0.49 of each other at the $186,051 boundary, so there is no cliff, but the logic either side of it is genuinely different.

A raise from $300,000 to $310,000 lifts the compulsory repayment from $30,000.00 to $31,000.00, $1,000.00 of the extra $10,000, before income tax. The repayment never eats the whole raise and cannot exceed it, because every band charges a rate on the income rather than a fixed sum at a threshold.

The $30,000.00 on this page is a repayment for one income year, not your loan balance, and the two are unrelated in size. Someone owing $8,000 and someone owing $80,000 both repay $30,000.00 on $300,000, the schedule reads your income and nothing else. The balance only decides how many years of it you have left. Your actual figure lives in ATO online services through myGov; no calculator can see it.

An employer withholds extra tax against a HELP debt automatically, but someone earning $300,000 as a sole trader has no employer doing that. The $30,000.00 compulsory repayment still applies, worked out the same way, from the same repayment income, but it is paid through PAYG instalments during the year or settled in full when the tax return is lodged, rather than skimmed off a regular pay run.

Lenders assessing a home loan application typically treat an outstanding HELP balance as an existing liability, the same way they treat a car loan or a credit card limit, and reduce the amount they will lend accordingly. On $300,000, the $30,000.00 compulsory repayment itself is only one part of that picture, it is the remaining loan balance, not the annual repayment, that most bank servicing calculators weigh most heavily.

Common questions

Is the 10% charged only on income above the threshold?

No, that's a common mistake. In the top band the 10% applies to your whole repayment income of $300,000, not just the part above $186,051, which is how $30,000.00 is arrived at.

What would a raise to $310,000 cost me?

The compulsory repayment would rise from $30,000.00 to $31,000.00, $1,000.00 of the extra $10,000.

Does my loan balance change this amount?

No. The compulsory repayment is worked out from your repayment income alone, so $300,000 produces $30,000.00 whether the balance is small or large. Check the balance itself in ATO online services through myGov.

I'm self-employed. How do I actually pay this?

There is no employer withholding to cover it, so the $30,000.00 is paid through PAYG instalments during the year or settled in full when you lodge, the $300,000 figure it is calculated from works the same way either way.

Does this debt affect getting a home loan?

Most lenders count an outstanding HELP balance as a liability when assessing how much they will lend, similar to a car loan. It is usually the remaining balance that weighs most in that assessment, not the $30,000.00 annual compulsory repayment.