How to use the BAS calculator
- 1 Enter total sales for the period.
- 2 Enter purchases that included GST.
- 3 Choose whether amounts are GST-inclusive or exclusive.
- 4 Add any PAYG instalment and read the amount payable.
Worked example
Sales of $55,000 and purchases of $22,000, both GST-inclusive. GST on sales is $55,000 ÷ 11 = $5,000, and GST credits are $22,000 ÷ 11 = $2,000. Net GST payable on the BAS is $3,000. Adding a $1,500 PAYG instalment would make the total $4,500.
BAS due dates and methods
- Quarterly due dates: 28 October, 28 February, 28 April and 28 July. Lodging through a registered agent online can give extra time.
- Cash or accrual: small businesses can account for GST when they are paid (cash) rather than when they invoice (accrual).
- Simpler BAS: businesses under $10 million turnover usually only report total sales, GST on sales and GST on purchases.
- Keep records for five years, including tax invoices for purchases over $82.50.
Check single amounts with the GST Calculator, and set aside income tax with the Sole Trader Tax Calculator.
Features
1A and 1B
GST on sales and GST credits, as labelled on the BAS.
Inclusive or exclusive
Divides by 11 or multiplies by 10%.
Refunds
Shows a refund when credits exceed GST on sales.
When to use it
Quarterly BAS
Prepare figures before lodging. Check one amount with the GST Calculator.
Cash flow
Set aside GST from each sale. Set aside income tax with the Sole Trader Tax Calculator.
New businesses
Learn how GST works. Company? See the Company Tax Calculator.
Big purchases
See the GST credit from equipment. Claim assets with the Depreciation Calculator.
Related Tax tasks
Frequently asked questions
How is GST payable calculated?
GST collected on sales (1A) minus GST paid on business purchases (1B).
How do I find GST in an inclusive price?
Divide by 11. A $110 sale includes $10 GST.
What purchases give credits?
Business purchases that include GST and have a valid tax invoice for amounts over $82.50.
What sales have no GST?
GST-free sales such as most basic food, some health and education, and exports; input-taxed sales such as residential rent.
When is BAS due?
Quarterly BAS is usually due on the 28th of the month after the quarter, with extensions for tax agents.
Cash or accrual?
Small businesses can report on a cash basis, counting GST when money is paid or received.
What if I get a refund?
When credits are larger than GST collected, the ATO refunds the difference.
What is PAYG withholding?
Tax withheld from employees' wages, also reported on the BAS.
Do I need to register for GST?
Once GST turnover is $75,000 or more ($150,000 for non-profits).
Can I lodge BAS online?
Yes, through Online services for business, your accounting software or your tax agent.
What if I make a mistake on a BAS?
You can usually correct it on a later BAS if the error is small, or revise the original statement.
Can I pay BAS by instalments?
If you cannot pay on time, you can set up a payment plan with the ATO, although interest may apply.
Do I report wages on BAS?
Yes, if you have employees: gross wages and PAYG withheld go on the BAS.
What is GST on imports?
GST is charged on most imported goods. Registered businesses can usually claim it back as a credit.
Results are estimates based on the official rates linked above. Confirm important figures with the issuing authority or a qualified adviser before you act on them.
Built and reviewed by Hamza Farooq, founder and lead developer
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