Calculators · BAS estimator

Estimate your BAS before you lodge.

Plug in this period's sales, purchases and PAYG figures — see the net BAS payable in seconds. Useful as a sanity check before you press lodge, or to plan cash flow for the 28th of the month after the period end.

Hand the BAS to a registered BAS Agent All calculators
A$
Total taxable supplies you billed customers (or received cash for) this quarter or month. Exclude GST-free / input-taxed sales.
A$
Total business-related purchases with GST credits — exclude private use, BAS-excluded items and salaries.
A$
Tax you have withheld from staff wages this period (matches W2 on your BAS).
A$
Your ATO-issued instalment amount (T7), if you pay PAYG instalments through the BAS.
Estimated net BAS payable
Estimate only. Cash-basis assumption, all sales taxable, all purchases input-credited.
A$15,000
GST collected on sales (1/11 of sales)A$10,000
GST credits on purchases (1/11)−A$3,000
Net GSTA$7,000
PAYG withheldA$8,000
PAYG instalmentA$0
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Indicative figure only. The actual BAS depends on your accounting basis (cash or accrual), GST-free/input-taxed sales, exempt purchases, FBT/WET/LCT obligations and fuel tax credits. Lodge through a registered BAS Agent if you want certainty.

How this works

The maths behind the figure.

A standard BAS combines net GST, PAYG withheld from employees and (optionally) your PAYG income-tax instalment into a single quarterly or monthly liability.

  • GST collected. Total taxable sales × 1/11. Sales include GST you've added to invoices.
  • GST credits. Business purchases × 1/11. Excludes private use, salaries and BAS-excluded items.
  • Net GST. GST collected minus GST credits. Negative = refundable.
  • PAYG withheld. Tax kept back from employee wages (label W2 on the BAS).
  • PAYG instalment. ATO-set quarterly instalment toward your own income tax (label T7).
  • Net BAS. Net GST + PAYG withheld + PAYG instalment.

This information is general in nature and does not constitute personal financial or tax advice. Tax laws are subject to change.

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