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Business

BAS / GST Payable Calculator

Estimate the net GST and total BAS amount payable or refundable for your Australian business activity statement, including PAYG withholding.

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Your results

Output GST (on sales)$10,000.00
Input tax credits (on purchases)$5,000.00
Net GST$5,000.00
Total BAS payable$5,000.00

Calculation breakdown

Output GST
$110,000.00 ÷ 11 = $10,000.00
Input tax credits
$55,000.00 ÷ 11 = $5,000.00
Net GST
$10,000.00 − $5,000.00 = $5,000.00
Total BAS
Net GST + PAYG withholding + PAYG instalment = $5,000.00

Assumptions

  • GST is calculated at 1/11th of GST-inclusive amounts, per the ATO's standard method.
  • GST-free sales and non-creditable purchases are shown for BAS labels but do not attract GST.
  • This is a simplified BAS estimate; it does not model adjustments, luxury car tax or wine equalisation tax.

Rates and thresholds are configured for the 2026–27 Australian financial year and should be reviewed when government settings change.

Results are estimates only and are not financial, tax, legal or credit advice.

How this calculator works

Enter your GST-inclusive sales, GST-free sales and creditable purchases and this calculator applies the ATO's 1/11th method to estimate output GST, input tax credits and your net GST position, then adds any PAYG withholding and instalment amounts to estimate your total BAS payable or refundable.

Rates sourced from the Australian Taxation Office for the 2026–27 financial year. Last reviewed 01/07/2026.

Frequently asked questions

How is GST calculated from GST-inclusive amounts?

GST is 1/11th of a GST-inclusive amount, since the GST-exclusive price plus 10% GST equals 11/10ths of the exclusive price.

Does this lodge my BAS?

No, this is an estimate only to help you plan cash flow. You must still lodge your BAS through the ATO's business portal or a registered agent.

Are GST-free sales taxed?

No, GST-free sales (such as basic food or exports) are included in your total sales for reporting but do not attract GST.

Rates and thresholds are configured for the 2026–27 Australian financial year and should be reviewed when government settings change.

Results are estimates only and are not financial, tax, legal or credit advice.

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