How does HECS interact with my tax return?
Your compulsory HECS-HELP repayment is worked out when you lodge your tax return. Your employer has been withholding an estimate from each pay (based on your declared loan and income), and at assessment the ATO compares that to your actual compulsory repayment. If you were over-withheld, you get a refund; if under-withheld, you owe the difference.
HECS repayments are not tax deductible. They're a repayment of a government debt, not an expense, so they don't reduce your taxable income. You can't claim a deduction for HECS-HELP repayments, voluntary or compulsory.
Why is HECS deducted from my pay?
Since 1 July 2017, employers withhold an extra amount from your pay when you've told them (via your TFN declaration) that you have a HELP debt. This is on top of regular PAYG tax. The withholding is an estimate — the exact compulsory repayment is calculated at tax time.
Can I get a HECS refund at tax time?
Yes. If your employer withheld more for HECS than your actual compulsory repayment, the excess is refunded with your tax return. This commonly happens when you have two jobs (withholding assumes one), when your income changed mid-year, or when you paid your loan off before year end.