Skip to content

ATO & tax debt

BAS debt, and how to catch up

BAS debt is usually a timing problem that hardened, not a spending problem. Here is how to get the real balance, why lodging matters even when you cannot pay, and how a payment plan compares to refinancing.

Dave Pham

Dave Pham

Head Broker

· 8 min read

A business owner’s desk at the end of a quarter, where the activity statement and the bank balance meet.

Why BAS debt builds the way it does

Most BAS debt is not a spending problem. It is a timing problem that hardened. The GST you collect sits in your account for up to three months before it is due, and the tax withheld from your employees sits there with it. On a good quarter that money looks like working capital. It is not. It is money you are holding on behalf of someone else, and on the due date you have to find it again.

Once one quarter is short, the next quarter has to carry two. That is the whole mechanism. Nothing about it requires bad management. One slow debtor, one quiet December, one piece of equipment that failed early, and the sequence starts.

What a BAS actually carries

  • GST collected on sales, less the GST credits on your purchases.
  • PAYG withholding, which is tax already deducted from your employees’ wages.
  • PAYG instalments toward the entity’s own income tax for the year.
  • Depending on the business, fuel tax credits, wine equalisation tax or luxury car tax.

What sits inside one quarter’s statement

In this illustrative quarter, five dollars in every six was collected and held on somebody else’s behalf. That is why a short month turns into a debt rather than a smaller profit — and two of these three components can later reach a director personally.

Illustrative composition of one quarter. Not a quote and not an offer of credit.

View as a table
ComponentAmountShare
GST collected, net of credits$28,00047%
PAYG withheld from wages$22,00037%
PAYG instalment$10,00017%
Total$60,000100%

Money the business earned

  • Margin on completed work, after cost.
  • Available for wages, stock, rent and reinvestment.
  • Yours to allocate, on your own timetable.
  • Falls with a quiet quarter, which is uncomfortable but survivable.

Money the business is holding

  • GST collected on sales, less the credits on your purchases.
  • PAYG withheld from wages before your employees ever saw it.
  • Due on a fixed date whether the quarter was good or not.
  • Spending it is a loan from next quarter, at a compounding rate.

Those components matter later, because two of them sit inside the director penalty regime. A BAS balance is not one uniform lump. Part of it can become personal, and knowing which part changes what you do first.

Lodge, even when you cannot pay

  • Failure-to-lodge penalties accrue for each period a statement is late and scale with the size of the entity. They stop the moment you lodge.
  • Payment plans generally require lodgements to be up to date. An unlodged statement can rule you out of the arrangement you are ringing to request.
  • Where you do not lodge, the ATO can raise an estimate of the liability. Defending an estimate is harder and slower than lodging the real figure.
  • A lender cannot fund a number that does not exist. Unlodged activity statements are the most common reason a tax debt refinance stalls at credit assessment.
Jul–Sep quarter
28 October
Oct–Dec quarter
28 February
Jan–Mar quarter
28 April
Apr–Jun quarter
28 July

Quarterly statements are generally due on 28 October, 28 February, 28 April and 28 July, with the December quarter given extra time over the holidays. Lodging through a registered agent usually attracts a further concession. If cash is the reason a statement has not gone in, say that to your agent and lodge anyway.

What the general interest charge actually does

The general interest charge applies to unpaid tax from the day after the due date. It is calculated daily and it compounds daily. Compounding daily on a balance that grows again every quarter is a different shape of curve to a fixed monthly interest bill, and it is why a balance that felt manageable in March can feel immovable by November.

General interest charge
Interest on unpaid tax, calculated daily and compounded daily from the day after the due date. Usually shortened to GIC.
Shortfall interest charge
Interest applied where an amended assessment increases what you should have paid for an earlier period.
Remission
The ATO reducing or removing an interest charge on request. Discretionary, decided case by case, and never something to build a plan around.
Integrated client account
The ATO account that carries your activity statement amounts. It is separate from the income tax account, and the two can move in opposite directions.

The rate is set each quarter by a published formula and it moves. We are not going to quote it here. Look it up on ato.gov.au before you make a decision that turns on it, and ask your accountant to show you the charge as a dollar figure per month rather than as a percentage. The dollar figure is the one that changes behaviour.

Remission is possible but it is not a right. You can ask the ATO to remit the general interest charge, and it will weigh what caused the delay and what you did about it. It is decided case by case, and a registered tax agent is the right person to prepare the request. Do not build a plan on the assumption it will be granted.

The same $120,000, three years apart

Left where it is, the balance compounds upward and nothing is repaid. Refinanced onto a set term, every payment takes principal out of it. The distance between the two lines at year three is the whole argument, and it widens every quarter you wait.

Illustrative projection only. Assumes a daily-compounding charge on one line and a principal-and-interest business loan on the other, both at assumed rates chosen to show the shape rather than to quote a product. Not a quote and not an offer of credit.

View as a table
MonthLeft as tax debtRefinanced over a set term
0$120,000$120,000
6$126,000$113,000
12$133,000$106,500
18$140,000$99,500
24$148,000$92,000
30$156,000$84,500
36$164,000$76,500

The catch-up sequence

  1. 01

    Get the real balance

    Download the account statements from Online services for business. The integrated client account and the income tax account are separate. A business can be in credit on one and well behind on the other, and the totals people quote from memory are almost never right.

  2. 02

    Lodge everything outstanding

    Every activity statement, every return. Nothing else on this list works until it is done, and it is usually the fastest step to complete because your agent can do most of it.

  3. 03

    Split the balance by type

    Ask your accountant to separate PAYG withholding and GST from the rest. Those components sit inside the director penalty regime. Superannuation is a separate charge with its own harder rules.

  4. 04

    Fix the cause before the number

    Move GST and withholding into a separate account weekly, on receipt, not quarterly on the due date. A refinance that leaves the collection habit unchanged buys twelve months and returns you to the same place.

  5. 05

    Choose the instrument

    A payment plan, a refinance, or a combination of both. The right answer depends on serviceability and security, not on which one feels less like an admission.

  6. 06

    Put the arrangement in writing

    Whatever you agree with the ATO, get the confirmation letter and diarise every instalment. A plan defaults on a missed date, not on a missed intention.

The quarterly rhythm that turns one short month into a balance nobody has sized.
Steps one and two are the ones most owners skip. Nothing further down the list can be priced until the balance is real and every statement is in.

Payment plan or refinance

Two legitimate ways to deal with a BAS balance. They suit different situations.
ATO payment planRefinance the balance
What it doesSpreads the existing debt over an agreed periodPays the ATO out and replaces it with a loan
InterestThe general interest charge keeps accruing on what is outstandingThe lender’s rate applies over a set term
DeductibilityInterest charges incurred from 1 July 2025 are not deductibleInterest on borrowings for business purposes generally is; confirm with your accountant
SpeedOften the same day for smaller balances arranged onlineDays to weeks, depending on lender and security
SecurityNone takenUsually property or business assets
Effect on escalationPauses it while the plan is metEnds it, because the debt is gone
If it goes wrongThe plan defaults and escalation resumes, often fasterYou have secured a business liability against an asset

That last row deserves a minute of your time. Moving unsecured tax debt onto the family home converts a business problem into a housing problem if trading does not recover. It is frequently the right call, because the alternative is a compounding charge and a collections process. It is never a small one, and any broker who treats it as routine paperwork is not doing the job.

The mistakes that cost the most

  • Not lodging because the money is not there. This is the expensive one, and it is the easiest to reverse.
  • Agreeing to a plan sized to what was asked for rather than what the business can pay every single month.
  • Paying last quarter’s instalments with this quarter’s GST. The hole moves; it does not close.
  • Waiting for the annual financials to be finished before dealing with a quarterly problem.
  • Applying to four lenders in a fortnight and leaving four enquiries on the commercial file.
  • Filing a director penalty notice in the pile to read on the weekend. The clock on it runs from the date on the notice.
The gap between what a quarter collected and what it owes, which is where every item on this list begins.
None of these are character flaws. They are cash-flow habits, and changing the habit is what stops the list repeating next year.

When finance is genuinely the right answer

Refinancing a BAS balance makes sense when the business is fundamentally sound and the debt is the residue of a bad period rather than the symptom of an unprofitable one. The test is simple to state and uncomfortable to answer: at current trading, can the business meet a fixed monthly repayment and still pay each new quarter as it falls due.

  • There is equity in property, or business assets a lender can take security over.
  • Lodgements are current, or can be made current inside a few weeks.
  • The plan the ATO has offered is larger than the business can sustain.
  • A director penalty notice or a garnishee notice has already appeared, which changes the timeframe entirely.

Where the answer to the serviceability question is no, finance is not the tool. That is the point at which an accountant and, if it comes to it, a registered insolvency practitioner give better counsel than a broker does. We will say so rather than write an application we do not believe in.

FAQ

Questions people actually ask

If yours is not here, ask it. We would rather answer the awkward one early than have you find out later.

1300 015 267
Can I lodge a BAS if I cannot pay it?
Yes, and you should. Lodgement and payment are separate obligations. Lodging on time avoids failure-to-lodge penalties, keeps you eligible for a payment plan, and gives the ATO a real figure rather than an estimate.
Does interest keep running on an ATO payment plan?
Yes. A payment plan spreads the debt, it does not freeze it. The general interest charge continues to accrue on the outstanding balance, which is why a long plan on a large balance can cost considerably more than it first appears.
Can I claim the interest the ATO charges me?
For interest incurred from 1 July 2025, the general interest charge and shortfall interest charge are not deductible. Interest on a loan used for business purposes generally is. Confirm the treatment for your circumstances with a registered tax agent before relying on it.
How far behind is too far behind?
There is no fixed line. What matters more than the size of the balance is whether lodgements are current, whether the business is trading profitably now, and whether there is security. We have seen large balances refinanced comfortably and small ones that could not be, for exactly those reasons.
Will the ATO accept a partial payout?
The ATO collects the debt that is properly assessed. It is not a commercial creditor negotiating a discount, and no broker can arrange a reduction. What can change is the form of the liability, by paying it out and replacing it with a loan on set terms.
Do I need my accountant involved to refinance BAS debt?
In practice, yes. Lenders will want current financials, tax returns, notices of assessment and account statements, and your accountant is the fastest route to all of them. They are also the right person to advise on the tax consequences of the structure.

Reading only gets you so far.

If any of this describes your situation, a fifteen-minute conversation will tell you more than another article will.

Or call us

1300 015 267

Monday – Friday, 09:00 to 17:30

Dave Pham, Head Broker at WeL'nd

“Tell me the number. I have almost certainly seen worse.”

Dave Pham · Head Broker

Talk to Dave1300 015 267

Sending this form gives us your permission to contact you about your enquiry, by phone or by email. We use your details for that purpose and hold them as set out in our privacy policy. You can ask us to stop at any time. Sending it does not apply for credit and does not commit you to anything.