Quick answer
Tax time squeezes cash flow because large, predictable payments — quarterly BAS, PAYG withholding, super and end-of-year tax bills — land on fixed dates regardless of how trade is going. You can see the gap coming by mapping those dates against your bank data. Setting money aside each week is the first defence; an ATO payment plan or short-term finance can bridge a genuine gap. Plan before the due date, not after.
Key points
- Quarterly BAS is generally due 28 October, 28 February, 28 April and 28 July.
- Lodging online may give extra time for most quarters — check the ATO's rules.
- From 1 July 2026, Payday Super means super leaves the account every payday.
- ATO interest charges incurred from 1 July 2025 are no longer tax-deductible.
- Finance can bridge a genuine timing gap; it shouldn't become a permanent tax overdraft.
Most cash-flow problems feel sudden. Tax-time cash-flow problems almost never are. BAS, PAYG withholding, super and income tax arrive on dates you can write in your calendar a year in advance. The trouble is that they land regardless of whether it’s been a good quarter or a quiet one — and they tend to land in lumps.
This guide is for business owners who aren’t necessarily looking for finance yet. It’s about seeing the tax-time squeeze coming, cushioning it, and knowing when — and when not — to use finance to bridge it.
Why does tax time hit cash flow so hard?
Because the money you owe the ATO has usually already passed through your account. GST is collected from customers with every sale. PAYG withholding is deducted from wages every pay run. In the moment, that cash sits in the business account looking like it’s yours. Then the quarter ends, and a single large payment is due.
If that money was spent on stock, wages or a slow month in the meantime, the BAS due date becomes a cash-flow cliff. Add an income tax bill after a good year, and the effect compounds.
Which dates matter?
The ATO lists these due dates for quarterly BAS reporters:
| Quarter | Period | Due date |
|---|---|---|
| Q1 | July – September | 28 October |
| Q2 | October – December | 28 February |
| Q3 | January – March | 28 April |
| Q4 | April – June | 28 July |
Businesses with GST turnover of $20 million or more report monthly, generally due on the 21st of the following month. If a due date falls on a weekend or public holiday, you can lodge and pay on the next business day.
The ATO also notes that lodging online may give you an extra two weeks to lodge and pay quarterly BAS, except for Q2, which already includes an extension. Check the ATO’s current rules and your agent’s arrangements; don’t assume extra time without confirming it.
Beyond BAS, put these in the calendar too:
- Income tax payment dates for your structure, from your accountant;
- Super, which from 1 July 2026 is due on every payday under Payday Super;
- Workers’ compensation, insurance and registrations, which often renew annually;
- EOFY on 30 June, when stock valuations, write-offs and bonuses all come into play.
Payday Super changes the rhythm
From 1 July 2026, the ATO’s Payday Super changes require employers to pay super guarantee at the same time as salary and wages, with contributions received by the fund within seven business days of payday (with some exceptions, such as for new employees). Before this, many businesses paid super quarterly, which gave a short-term cash cushion.
That cushion is gone. Super now leaves the account every pay cycle. For staff-heavy businesses this smooths the bumps — no more large quarterly super bills — but it also removes cash that some businesses were quietly relying on between quarters. Our guide on Payday Super and hiring cash flow looks at this in depth.
How do you see the gap coming from your own bank data?
You don’t need forecasting software to start. Try this:
- Download the last twelve months of business bank statements.
- Mark every tax payment — BAS, PAYG instalments, income tax, super.
- Note your balance in the two weeks before each one. Was it comfortable or tight?
- Look for a pattern. Is one quarter always worse? Does EOFY always pinch?
- Estimate the next payment from this quarter’s sales and wages so far.
- Compare it with what you’ve set aside.
If the estimate is bigger than what’s set aside, you’ve found your gap — weeks before it becomes a problem. That’s the moment to act.
First line of defence: a tax account
The simplest protection is boring and effective: a separate bank account for tax money. Every time revenue lands, transfer the GST component, any PAYG withheld and an allowance for income tax into it. Don’t touch it for anything else.
It won’t fix a business that’s genuinely short of cash, but it stops tax money being spent by accident — which is how most tax-time gaps begin.
When the gap is real: plan or finance?
Sometimes, even with good habits, there’s a genuine shortfall: a big customer paid late, a quarter was unusually slow, or growth soaked up cash in stock and wages. You have two main options.
An ATO payment plan
The ATO offers payment plans that break a debt into instalments. Its guidance notes that general interest charge continues to accrue daily, that future tax obligations must be paid in full and on time while the plan runs, and that missing them can cause the plan to default. Since 1 July 2025, the ATO’s general interest charge and shortfall interest charge are no longer tax-deductible — a change that affects how expensive carrying a tax debt really is.
Finance to bridge the gap
A business line of credit can cover a short, genuine gap and be repaid as revenue arrives. A short-term loan can do the same for a one-off bill. If tax debt has already built up over several quarters, a structured loan — often property-secured — can clear it in one go; see business loans to clear ATO debt.
| Situation | Often suits |
|---|---|
| One-off shortfall, revenue arriving soon | Line of credit or short-term loan |
| Repeating squeeze every quarter | Line of credit, plus a review of pricing and set-asides |
| Debt built over several quarters | ATO plan or a structured loan to clear it |
| Debt affecting your ability to get other finance | Loan to clear, compared with a plan |
If you’d like to compare options for your own numbers, talk to a specialist online. There’s no credit check to enquire.
EOFY: the other tax-time pressure
The end of the financial year brings its own cash-flow decisions. Many businesses buy equipment before 30 June to bring forward a deduction. The ATO’s instant asset write-off for 2025–26 allows eligible businesses with aggregated turnover under $10 million to immediately deduct the business portion of assets costing less than $20,000 each.
Two cautions. First, the write-off changes the timing of a deduction — it doesn’t make the asset cheaper. Second, draining cash to buy equipment in June can leave you short for the July BAS. Equipment finance can let you buy the asset without emptying the account, but only if the asset genuinely helps the business. Talk to your accountant first.
The warning signs tax is becoming the overdraft
Tax-time gaps become dangerous when they stop being occasional:
- you regularly pay BAS late, or only after a big sale lands;
- you’ve used finance for tax more than twice in a year;
- your ATO account carries a balance quarter after quarter;
- you avoid opening ATO correspondence.
If that’s you, the issue probably isn’t tax timing — it may be pricing, margins or costs. Finance can still help clear the backlog, but pair it with a hard look at the numbers. business.gov.au’s cash-flow guidance suggests practical levers: invoice earlier using accounting software, encourage faster payment, take deposits, and negotiate better supplier terms.
Illustrative example: a quarter that always pinched
Illustrative only. A café owner notices that every year the BAS due in late February hurts — summer holiday trade has been strong, but January wages and stock for the reopening of nearby offices drain the account just before it’s due. She maps twelve months of statements and sees the same pattern three years running.
She sets up a separate tax account and starts transferring a share of each day’s takings. For this year’s shortfall, she enquires online in early February rather than late, and arranges a small line of credit that she draws for the BAS and repays by April. Next year, the tax account should cover most of it.
Get ahead of the next due date
Tax time is predictable, which means it’s plannable. Map your dates, set money aside every week, and if a genuine gap appears, act before the due date rather than after it.
If you’d like a specialist to look at your numbers and suggest a sensible bridge, our enquiry takes about a minute and involves no credit check. It goes to one team who work through your situation — not to a pile of lenders who’ll each want a piece. Please be honest on the form about any existing ATO balance and when your next payment is due; that’s what lets us suggest the right option first time. Plan your tax-time cash flow with us.
Frequently asked questions
When are quarterly BAS due?
For quarterly reporters, the ATO lists 28 October, 28 February, 28 April and 28 July. If a date falls on a weekend or public holiday, you can lodge and pay on the next business day.
Is it better to use a loan or an ATO payment plan for a BAS bill?
It depends on the amount, your cash flow and how the debt affects the business. A plan keeps you dealing with the ATO; a loan clears the tax debt. A specialist can help you compare.
Can I deduct ATO interest charges?
Not for charges incurred from 1 July 2025 onwards. The ATO confirms general interest charge and shortfall interest charge are no longer deductible from that date.
How do I stop tax time catching me out?
Transfer GST, PAYG withholding and an income tax allowance into a separate account every time you're paid, and map due dates in your calendar.
Can I get finance to buy equipment before 30 June?
Yes. Equipment finance is common before EOFY, but buy because the asset helps the business, not just for the deduction. Check eligibility for the instant asset write-off with your accountant.