BAS and Tax Lodgement Calendar

Your lodgement cycle drives everything

The single biggest variable in your tax calendar is your reporting cycle. Most small businesses lodge a Business Activity Statement quarterly; businesses above certain turnover or withholding levels lodge monthly. The ATO tells you your cycle when you register, and it can change as you grow. Everything below hangs off that cycle. One important caveat before the detail: due dates shift depending on how and through whom you lodge, so always confirm your own dates with the ATO or your registered agent rather than relying on any published list — including this one.

What the BAS actually covers

The BAS is a bundle, not a single tax. Depending on your registrations it can include:

• GST — the net of GST collected on sales and GST credits on purchases.
• PAYG withholding — the tax you've withheld from employee wages.
• PAYG instalments — pre-payments towards your own income tax.
• FBT instalments — if you're in the fringe benefits tax system.

Knowing which labels apply to you tells you what data must be clean before each lodgement.

The quarterly rhythm

BAS quarters follow the financial year: July–September, October–December, January–March and April–June. Each statement falls due roughly a month after the quarter closes — the ATO publishes the exact dates, and lodging through a registered tax or BAS agent generally buys you extra time under the agent lodgement program. That extension is one of the most under-appreciated reasons to use an agent.

The monthly rhythm

If you're on a monthly cycle, your BAS (or Instalment Activity Statement, for withholding-only months) is due shortly after each month ends. Monthly lodgers live or die by bookkeeping discipline: there's no slack to catch up a messy quarter. Reconcile weekly, lodge monthly, and the cycle stays boring — which is the goal.

The annual layer

• Income tax return — due date depends on entity type, lodgement history and whether an agent lodges for you.
• FBT return — the FBT year runs on its own cycle, separate from the income year; if you provide cars, entertainment or other benefits, check the ATO's current FBT dates.
• Taxable Payments Annual Report (TPAR) — applies to businesses in certain industries (building and construction, cleaning, courier, IT and others on the ATO's list) that pay contractors. Due annually; the ATO publishes the date.
• STP finalisation — closing out employee year-end data soon after 30 June.

What happens when you miss one

Late lodgement can attract failure-to-lodge penalties, and late payment accrues the ATO's general interest charge at whatever rate currently applies. But the quieter cost is credibility: a clean lodgement history is what gives you room to negotiate payment plans when cash is genuinely tight. Lodge on time even when you can't pay on time — they're separate problems, and the ATO treats them separately.

Build the calendar once, then automate it

• Confirm your cycle and your entity's actual due dates with the ATO or your agent.
• Put every date in a shared calendar with a two-week warning, owned by a named person — not just "the accountant".
• Reconcile continuously so lodgement is a review task, not an archaeology dig.
• Review the calendar every July when the new year's dates are published.

If tax deadlines routinely become fire drills, the problem is usually the handoffs between bookkeeping, payroll and the agent — the coordination tax in action. A well-run finance function makes the whole cycle quiet.