Sole trader tax calculator
A straight estimate of this year's tax: income tax, the Medicare levy, your study loan, and what to put aside each week so June isn't a shock.
Your estimate shows up here
Put your numbers in and hit Work it out. Nothing gets sent anywhere, and nothing is saved.
The maths is the rule book our tax returns run on, with the rates read straight from the ATO's published tables.
Tax rates for 2026–27
The same figures the calculator above used, straight out of our rate book.
| Taxable income | Tax on this income |
|---|---|
| $0 – $18,200 | Nil |
| $18,201 – $45,000 | 15c for each $1 over $18,200 |
| $45,001 – $135,000 | $4,020 plus 30c for each $1 over $45,000 |
| $135,001 – $190,000 | $31,020 plus 37c for each $1 over $135,000 |
| $190,001 and over | $51,370 plus 45c for each $1 over $190,000 |
Excludes the Medicare levy.
Questions sole traders ask us
This is a planning estimate, not tax advice, and it assumes you’re single with no capital gains, rental income or prior-year losses. Your accountant does the real one. If you don’t have one, every Billbook client can be handed straight to a practice on Billbook.
Stop guessing at tax time.
Keep your invoices and receipts in Billbook and your income, expenses and GST are already worked out when the return is due. Free forever.