Business Costs & BAS Calculator
Calculate your quarterly gross profit, net profit, GST owed (BAS), PAYG instalments, and superannuation obligations — aligned to 2025/2026 ATO requirements for Australian businesses.
Quarterly Figures
Materials, direct labour, subcontractors
Rent, insurance, utilities, software, marketing
How GST & BAS Works
When you're GST-registered, you collect 10% GST on taxable sales and claim back GST paid on business purchases (Input Tax Credits). The difference is your net GST position reported on your BAS. If GST Collected > GST Paid, you remit the difference to the ATO. If negative, the ATO refunds the difference.
PAYG Instalment System
Businesses use PAYG Instalments to pre-pay their income tax in quarterly amounts, avoiding a large end-of-year bill. The ATO will issue you a PAYG Instalment Rate on your first BAS after lodging a tax return showing business income. The safe-harbour rate is approximately 22–25% of gross business income.
Super Guarantee (SGC)
As an employer, you must pay 11.5% of each employee's Ordinary Time Earnings into their super fund each quarter. SGC payments are due by the 28th day after the end of each quarter. From July 2026, the rate rises to 12%. Late SGC payments become non-deductible and incur the SGC charge.
Frequently Asked Questions
What is a BAS (Business Activity Statement)?
A BAS is a form submitted to the ATO (Australian Tax Office) each quarter (or monthly) by businesses registered for GST. It reports GST collected on sales, GST paid on purchases, and any PAYG withholding or PAYG instalment amounts. Net GST owed or refundable is calculated as GST Collected minus GST Paid (Input Tax Credits). BAS lodgement is due 28 days after the end of each quarter.
What is the GST rate in Australia?
The Goods and Services Tax (GST) rate in Australia is 10%. Businesses registered for GST must add 10% to their taxable sales. To add GST: multiply the base price by 1.10. To find the GST in a GST-inclusive price: divide by 11. Businesses with annual turnover over $75,000 (or $150,000 for non-profits) must register for GST.
What is a PAYG instalment?
PAYG (Pay As You Go) instalments are quarterly pre-payments of income tax for businesses and individuals with investment income. The ATO calculates your required instalment rate based on your last tax return. Alternatively, you can use a safe-harbour rate (approximately 22–25% of business income) to avoid underpayment penalties. This calculator estimates your quarterly PAYG instalment based on your profit and business structure.
What is the company tax rate in Australia in 2026?
Base rate entities (companies with aggregated turnover under $50 million that derive 80% or less of income from passive sources) pay a company tax rate of 25%. All other companies pay 30%. Sole traders, partnerships, and trust beneficiaries pay individual marginal rates (0%, 19%, 32.5%, 37%, or 45% depending on income level, plus the Medicare Levy of 2%).
What is the Superannuation Guarantee (SGC) rate in 2026?
The Superannuation Guarantee rate in the 2025/2026 financial year is 11.5% of Ordinary Time Earnings. Employers must pay this into their employees' super fund by the 28th day after the end of each quarter. From 1 July 2026, the rate increases to 12%. Failing to pay SGC on time results in the Super Guarantee Charge, which is non-deductible and includes additional penalties.