Quick answer
Strictly, yes. Lodging an objection doesn't change the due date, and general interest charge keeps building on any unpaid amount from that date. In practice the ATO usually holds off collecting a disputed debt until the dispute is finalised. A 50:50 arrangement, where you pay the undisputed tax plus half the disputed amount, defers recovery and halves the interest that keeps accruing. If you win, the ATO refunds what you've overpaid.
Key points
- An objection doesn't move the due date. Interest runs from the original date on whatever stays unpaid.
- The ATO usually doesn't chase a disputed debt until the dispute ends, but that's a risk-based practice, not a right.
- A 50:50 arrangement: pay all undisputed tax plus half the disputed amount, and the ATO defers recovery and remits half the ongoing interest.
- Large businesses are expected to pay at least half. Smaller businesses can ask for the arrangement.
- Win the dispute and the ATO refunds what you overpaid. Lose it with nothing paid and you face the full interest bill, which is no longer tax deductible.
An audit finishes, an amended assessment lands, and the figure on it is one you simply don’t accept. Your accountant thinks you have a good case and starts drafting an objection. Then the obvious question: do we have to pay this while we argue about it?
The short version: the bill is legally due on the original date whether you object or not, and interest runs on it from that date. What you actually pay while the dispute plays out is a choice, though, and the right choice can save a lot more than most owners expect. Here’s how it works.
Does an objection put the ATO debt on hold?
No, and this catches people out. Lodging an objection leaves the payment deadline exactly where it was. So from the day the amended amount fell due, general interest charge (GIC) compounds daily on every dollar that stays unpaid.
Where you do get some breathing room is collection. The ATO’s page on choosing a dispute option explains that it typically waits for the outcome before chasing an amount you’re contesting. Two ideas in that matter: “typically” and “contesting”.
- “Typically” means the ATO weighs the risk in each case. If it’s worried the money won’t be there at the end, for example because assets are being moved or other debts are mounting, it can start collecting before the objection is decided.
- “Contesting” means only the part genuinely under challenge. Any tax you agree you owe, plus unrelated BAS or super debts, sits outside that protection and can be chased as normal.
There’s also the interest itself. Since 1 July 2025, GIC is no longer tax deductible. A dispute that runs for a year or more on an unpaid balance can leave you with a large interest bill that is now a genuine after-tax cost if you lose.
What is a 50:50 arrangement?
It’s the ATO’s middle path for disputed debts. Under a 50:50 arrangement you:
- pay any undisputed tax in full;
- pay at least half of the disputed primary tax up front; and
- agree to provide whatever information the ATO needs to resolve the dispute.
In return, the ATO defers recovery of the remaining half and remits half of the GIC that accrues on that unpaid balance while the dispute is running. The ATO’s page on how much you owe puts the effect simply: if the objection fails, you’re only charged half of the interest that builds on the outstanding amount from the date you made the payment.
For large businesses this isn’t really optional. The ATO’s disputes guidance for larger groups says it expects them to pay at least half the debt or pay it in full. Small businesses and individuals aren’t held to that expectation, but they can ask for the arrangement, and it’s worth asking for in writing so everyone is clear on what’s been agreed.
Pay nothing, pay half, or pay it all?
Here’s how the three choices compare once an objection is lodged.
| Pay nothing yet | 50:50 arrangement | Pay it all now | |
|---|---|---|---|
| Cash out today | Undisputed tax only (you still owe it) | Undisputed tax plus half the disputed amount | Everything |
| Interest while you wait | Full GIC on the whole disputed amount | Half the GIC on the unpaid half | None on what’s paid |
| Collection risk | Low in most cases, but at the ATO’s discretion | Recovery deferred by agreement | None |
| If you win | Debt reduced or cancelled | Refund of what you overpaid | Refund of what you overpaid |
| If you lose | Pay the lot, plus full interest | Pay the other half, plus reduced interest | Nothing more to pay |
Nothing in the right-hand column hurts your case. Paying doesn’t mean you accept the assessment, and you keep every right to object, seek review and appeal.
The real trade-off is cash flow against risk. Paying nothing keeps money in the business but leaves the full interest bill hanging over you. Paying in full removes all the interest risk but takes the most cash out of the business at what is often an already tight time.
How long do you have to object?
Time limits depend on the decision. According to the ATO’s time-limit guide:
- Income tax assessments: generally two years for most individuals and small and medium businesses, and four years for everyone else.
- Amended assessments: the later of 60 days from when you received the amended assessment, or whatever time is left on the original.
- Other decisions: these vary, and some are as short as 60 days.
If the objection is disallowed, small businesses can take the decision to the Administrative Review Tribunal, which replaced the AAT in October 2024 and charges a lower application fee for tax decisions about a small business entity. Each stage adds months, and the interest clock keeps ticking the whole way through. That’s why the payment decision matters more the longer you expect the fight to last.
Weighing up whether to pay the disputed amount now? See if you qualify for funding sized to the 50:50 payment or the full balance. It takes about a minute.
What a dispute does and doesn’t protect
A live objection gives you some useful cover:
- Credit reporting: the ATO doesn’t report a business tax debt to credit bureaus while you’re actively disputing it through an objection, review or appeal. Our page on ATO credit reporting explains the thresholds and the 28-day letter.
- Collection: in most cases, no garnishee notices or legal action on the disputed amount while the objection is open.
It doesn’t cover everything:
- Undisputed debts keep going through the normal collection process.
- Director penalties work on their own track. A company arguing about its income tax assessment hasn’t dealt with any separate PAYG withholding, GST or super arrears, and those are what create personal exposure for directors.
- Lenders and buyers will still see the debt. A bank reviewing your facility, or a buyer doing due diligence, will notice a large disputed amount on your ATO statement and may want to know how you’ll fund it if you lose.
Why some owners borrow to pay a disputed debt
It sounds odd to borrow to pay a bill you don’t think you owe. But for many businesses the maths, and the peace of mind, point that way.
Funding the 50:50 payment. The arrangement halves the interest risk and defers recovery, but it needs a lump sum up front. A short-term loan can provide that without draining working capital in the middle of an already difficult year.
Paying the whole lot. If the disputed sum is big and the dispute could run for years, clearing it stops interest completely. If you win, the refund can go straight into paying down the loan. If you lose, there’s no interest bill waiting at the end.
Keeping other doors open. A nil or arranged ATO balance makes refinancing, selling the business or renewing a bank facility far simpler than a large unresolved debt does.
The honest caveats: a loan has its own cost, so compare it properly against the GIC you’d otherwise risk. Our payment plan vs loan calculator lets you plug in the current GIC rate and a loan quote side by side. You also need a way to repay the loan that doesn’t depend on winning. Objections can take longer than expected, and the result isn’t guaranteed.
What’s available depends on your security. With residential or commercial property behind it, a first mortgage, caveat loan or second mortgage can cover anything from $20,000 to $5,000,000, and property-secured money can sometimes land in as little as 24 hours. No property? Trading businesses can look at unsecured and cash-flow facilities, usually somewhere between $5,000 and $500,000 depending on turnover and what the bank statements show. If it’s set up that way at settlement, the lender can pay the ATO directly.
A worked example: the amended GST assessment
This is an illustrative scenario, not a real client.
A family company runs two hardware and garden supply stores in regional Queensland. After a GST audit, the ATO issues amended assessments totalling about $210k. The directors’ accountant agrees that around $60k is right, a genuine coding error, but believes the remaining $150k rests on a misreading of how certain supplies were treated. The accountant expects an objection, and possibly a tribunal review, to take 12 to 18 months.
The three paths look like this:
- Pay nothing on the disputed $150k. They’d still owe the $60k now. If they lose after 18 months, the full $150k is due with a year and a half of GIC on top, and none of that interest is deductible.
- Enter a 50:50 arrangement. They pay $60k plus $75k now. Recovery of the other $75k is deferred, and if they lose, only half the interest on it applies.
- Pay all $210k. No interest risk at all, and the refund arrives if they win.
They choose the 50:50 path, funding the $135k with a second mortgage over the commercial premises one director owns. Their bank facility review is due in six months, and they want the ATO statement to show an arrangement in place rather than an open debt. Their accountant runs the numbers on both outcomes before they sign. If they win, the refund pays down most of the loan. If they lose, the remaining $75k and reduced interest are planned into a longer-term refinance.
Fighting the ATO and still need the cash to pay?
Plenty of the business owners we talk to aren’t behind because they’ve been careless. They’re in a genuine disagreement with the ATO about what they owe, and the dispute has turned into a cash problem. We help with tax debts every week, disputed ones included, and we’re one of the few funders who don’t back away from them.
Curious whether a loan could fund the 50:50 payment, or clear the balance outright while the objection is decided? Our enquiry form is a one-minute job, and there’s no credit check when you first enquire. Your details stay with us rather than being fired off to a pile of lenders, so you won’t spend the next week fielding calls from brokers you’ve never heard of. Instead, someone on our team who deals with ATO disputes looks at your circumstances personally and rings you.
One favour: answer the questions accurately. Tell us the full ATO balance, the slice of it you’re contesting and what stage the objection has reached. With those three facts we can say on the very first call whether borrowing makes sense, or whether a 50:50 arrangement on its own will see you through.
Frequently asked questions
Does lodging an objection stop the ATO from collecting the debt?
Not automatically. The due date stays the same and interest keeps accruing. The ATO's usual practice is not to take recovery action on a disputed debt until the objection is finalised, but it decides case by case and can act sooner where it sees a risk to collection. Paying the undisputed part and talking to the ATO early makes that much less likely.
What is a 50:50 arrangement with the ATO?
It's an agreement where you pay any undisputed tax plus at least half of the disputed amount, and agree to give the ATO the information it needs to resolve the dispute. In return, the ATO defers recovery of the rest and remits half of the general interest charge that accrues on the unpaid balance while the dispute runs.
Do I get my money back if my objection succeeds?
Yes. If the outcome reduces your debt below what you've already paid, the ATO pays back the difference. Paying while you dispute doesn't weaken your case or mean you've accepted the assessment.
How long do I have to object to an ATO assessment?
For income tax assessments it's generally two years for most individuals and small and medium businesses, and four years for other taxpayers. For an amended assessment you have the later of 60 days or the time left on the original. Other decisions have their own limits, some as short as 60 days, so check the ATO's time-limit table for your decision.
Will a disputed ATO debt end up on my credit file?
The ATO doesn't report a business tax debt to credit bureaus while the business is actively disputing it through an objection, review or appeal. The protection only covers the amount genuinely in dispute, so undisputed overdue tax can still count towards the reporting rules.
Can I borrow to pay a disputed tax debt?
Yes. Some owners use a property-secured or unsecured business loan to make the 50:50 payment, or to pay the whole amount and stop interest altogether. It makes sense when the loan's total cost is lower than the interest you'd risk, and when you can repay it whichever way the dispute goes.
Sources
Facts on this page were checked against official sources on 4 October 2026. Rules and thresholds change, so confirm anything critical on ato.gov.au or asic.gov.au.
