ABN tax calculator (sole traders) 2026-27
This ABN tax calculator shows the tax, GST and set-aside on sole trader income. On $90,000 received including GST and $15,000 of expenses, set aside 20.17% of every payment.
The link carries the numbers you entered, so anyone who opens it sees the same result.
Set aside
20.17% of every payment
Set aside 20.17% of every payment
That covers $11,338 of tax and $6,818 of GST on $90,000 received.
Breakdown
| Net business income | $68,181.82 |
|---|---|
| Taxable income | $68,181.82 |
| Income tax before the small business offset | $10,974.55 |
| Small business income tax offset | $1,000 |
| Income tax | $9,974.55 |
| Medicare levy | $1,363.64 |
| Total tax | $11,338.19 |
| GST collected | $8,181.82 |
| GST credits on expenses | $1,363.64 |
| GST to send the ATO | $6,818.18 |
- Total tax, levy and HELP
- $11,338
- Left to pay at tax time
- $11,338
- Before any instalments you've paid. Negative means a refund.
- GST to send the ATO
- $6,818
- Rough PAYG instalment a quarter
- $2,835
- An estimate. The ATO sets your real amount.
- Net business income
- $68,182
GST: what you collect and what you send
Once you're registered, one eleventh of a GST-inclusive price belongs to the ATO. You take off the GST in your business expenses and send the rest. You must register at $75,000 of GST turnover, and the ATO's registering for GST page (opens in a new tab) has the steps. The GST calculator works out a single price.
The small business income tax offset
If your turnover is under $5 million, you get 16% off the tax on your business income, up to $1,000 a year. The ATO small business offset page (opens in a new tab) has the formula. It's non-refundable and doesn't cut the Medicare levy. With a job as well, only the business's share of your income counts.
PAYG instalments
The ATO usually starts instalments once you have $4,000 of business or investment income, $1,000 of tax on your last assessment and $500 of estimated tax. It sets your amount from your last return, so ours is only a rough quarter of the tax the business adds. The ATO's PAYG instalments page (opens in a new tab) has the rules.
Your income tax follows the income tax calculator, and a study loan follows the HECS repayment calculator.
Does a sole trader pay super on their own income?
Super guarantee doesn't cover you. You can pay your own, and a contribution you claim as a deduction needs a notice of intent that your fund acknowledges.
What if I also have a salary?
Add it here with the tax already withheld. Your business income then stacks on top of the salary, so it's taxed at your higher rates.
Why isn't the set-aside figure the same as my tax rate?
It's a share of the money you receive, and that includes GST and your expenses. A business with few expenses sets aside more.
- GST calculator: add GST or take it out of a price.
- Income tax calculator: tax on a salary.
Estimates only, based on published rates for 2026-27. General information, not tax or financial advice.
Keep going
Sources