An unpaid ATO debt grows through the General Interest Charge, which compounds daily from the original due date. A separate Failure to Pay penalty can apply for every 28 days the debt stands. Leaving Australia stops neither, and the debt can be taken out of your super payment.
Where do working holiday tax debts come from?
Almost never from wages, which arrive with tax already withheld. Debts come from income that arrived untaxed.
- ABN or contracting income with nothing withheld during the year
- An unpaid Business Activity Statement for a GST registered rideshare driver
- An amended assessment that increased the tax after the original return
- A penalty assessment for late lodgement or understated income
The most common version is a rideshare or delivery year where every payout was treated as spendable. Our guide to driving Uber on a working holiday covers why a portion has to be set aside as it arrives.
What is the General Interest Charge?
Daily compounding interest on an unpaid tax debt, set quarterly well above the cash rate and running at around 11% a year in 2025-26. It runs from the original due date until the debt is cleared and does not pause.
A $1,000 debt left for a year gathers roughly $115. Left for three years it gathers roughly $370, accruing while you live in another country.
What is the Failure to Pay penalty?
A separate charge from the interest, applied at one penalty unit of $330 for every 28 days the debt remains unpaid, capped at five units. Unlike the interest, it is applied at the ATO's discretion rather than automatically.
It follows substantial debts, repeated non payment, and above all silence. Engaging with the ATO puts you in a very different position from ignoring three notices.
How is this different from a late lodgement penalty?
They are independent systems that can both apply to the same year. Failure to Lodge is charged when the return itself is late, at $330 per 28 days up to five units. Failure to Pay plus interest is charged when the money is not paid by the due date.
Lodging late and paying late attracts both, and the combined total can exceed the tax originally owed. Our guide to late return penalties explains where lodgement penalties actually bite, which is rarely when a refund was due.
When is the debt actually due?
For an individual lodging through a registered agent, payment is generally due 21 days after the notice of assessment is issued. For self lodgers the date is typically 21 November following the end of the financial year. BAS debts are due when the BAS is due, 28 days after the end of the quarter for most lodgers.
The 21 day window catches people who lodge in April expecting a refund and get a bill. Know the position before the return goes in.
What happens if you leave Australia owing money?
The debt does not travel with your passport but it does not disappear either. Interest keeps accruing daily, the debt can be offset against any future Australian refund, and it sits on your record when any future Australian visa is assessed.
The offset that hurts most is against your super. The ATO can set an outstanding tax debt against a DASP payment. DASP is already withheld at 65%, so less is left to absorb the debt than the gross balance suggests. A $4,000 super balance pays out about $1,400 after DASP withholding, and a $2,000 debt consumes all of it and leaves $600 outstanding. Resolving the debt before claiming is usually the better order.
Can the interest or penalty be remitted?
Yes. The ATO has discretion to reduce or cancel both the interest and the Failure to Pay penalty where there are grounds.
- Genuine financial hardship that prevented payment
- An ATO administrative error that caused or contributed to the debt
- Circumstances outside your control, such as serious illness or a natural disaster
- A first instance of non payment against an otherwise clean history
A remission request has to be made specifically and supported with evidence. A general complaint about the amount is not a request.
How do you find out what you actually owe?
The debt on a notice of assessment is a snapshot, not a running total, because interest accrues daily from the original due date. A figure quoted in a letter from four months ago is already wrong.
The current position also depends on every return and statement being lodged. An outstanding BAS quarter or earlier year leaves the debt on file incomplete, and sometimes overstated, since an unlodged refund year sits unclaimed and cannot offset anything.
What does a payment plan actually change?
A payment plan stops collection action and converts the debt into instalments you can meet. It does not stop the interest, which keeps accruing on the declining balance, so a plan is a cash flow arrangement rather than a discount.
Short plans under twelve months are generally available on request. Longer ones require more documentation, and hardship arrangements exist separately. A plan requested before the due date is routine administration; the same request after eighteen months of silence is a much weaker negotiation.
What order should you deal with this in?
Lodge everything first, establish the real figure, then deal with it. Reversing that order is how people pay interest on a wrong assessment, or clear a debt while an unlodged year that would have covered it sits unclaimed. Resolve the debt before any super claim.
What decides how badly this goes?
Not the size of the original debt. It is how early you engage, and whether every outstanding return and statement has been lodged. Our guide to ATO payment plans covers the first, and the second is settled by getting the tax return and any BAS complete before you fly.