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
Head Broker
· 8 min read

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
- GST collected, net of credits$28,000
- PAYG withheld from wages$22,000
- PAYG instalment$10,000
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
| Component | Amount | Share |
|---|---|---|
| GST collected, net of credits | $28,000 | 47% |
| PAYG withheld from wages | $22,000 | 37% |
| PAYG instalment | $10,000 | 17% |
| Total | $60,000 | 100% |
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
| Month | Left as tax debt | Refinanced 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
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.

Payment plan or refinance
| ATO payment plan | Refinance the balance | |
|---|---|---|
| What it does | Spreads the existing debt over an agreed period | Pays the ATO out and replaces it with a loan |
| Interest | The general interest charge keeps accruing on what is outstanding | The lender’s rate applies over a set term |
| Deductibility | Interest charges incurred from 1 July 2025 are not deductible | Interest on borrowings for business purposes generally is; confirm with your accountant |
| Speed | Often the same day for smaller balances arranged online | Days to weeks, depending on lender and security |
| Security | None taken | Usually property or business assets |
| Effect on escalation | Pauses it while the plan is met | Ends it, because the debt is gone |
| If it goes wrong | The plan defaults and escalation resumes, often faster | You 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.

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.



