Free tools for Australian sole traders
GST, BAS, tax and invoicing calculators that run entirely in your browser. No sign-up, no tracking, and rates checked against the ATO and IRD.
Calculators and templates
- GST calculatorAdd or remove 10% GST, line by line
- Sole trader tax 2026-27NewIncome tax, Medicare levy and how much to set aside
- BAS due datesFY2026-27 quarterly due dates, adjusted for holidays
- Do I need to register for GST?New$75,000 threshold, current and projected
- PAYG instalmentsT1 × T2 = 5A, with the ATO's example
- Super guarantee12% and Payday Super deadlines
- Instant asset write-offNew$20,000 per asset, now permanent
- Cents per km91c for 2026-27, 5,000 km cap
- Work from home70c per hour fixed rate method
- Quote templateNewPrintable, GST-ready quote with acceptance block
- Payment reminder emailsPolite overdue-invoice emails, ready to copy
- Late payment interestSimple interest on overdue invoices
- Invoice numbersNext number and numbering formats
- Check an ABNABN Lookup step by step, plus a format checker
- NZ GST calculator15% GST, 3/23 fraction
By trade
- GST and invoice guides by tradeElectricians, plumbers, carpenters, painters, cleaners, landscapers, photographers, handymen and rideshare drivers
- BAS due dates by stateEach state's holidays and where to get free help
Guides
- How to chase an unpaid invoice in Australia: 5 polite email templates
- Tax invoice vs invoice in Australia: what must be on it
- BAS G1, 1A and 1B explained, with FY2026-27 due dates
- NZ GST return (GST101A) boxes 5 to 15 explained
- Build an invoice reminder workflow in n8n with Google Sheets
Templates from the Quillroo store
- 5 payment reminder emailsFreePDF of polite, escalating templates
- BAS quarter checklistFreeOne page, every quarter
- GST & BAS Workbook FY2026-27G1, 1A and 1B totalled each quarter
- Tradie GST & BAS WorkbookJobs, materials and GST credits
- Rideshare & Delivery Driver WorkbookTrips, km and business-use split
- AU Invoice Chaser for n8nAutomatic reminders from a Google Sheet
- Sole Trader Admin KitWorkbook and invoice chaser bundle
- Speed-to-Lead pack for n8nInstant replies to new enquiries
- NZ GST Workbook 2026-27GST101A boxes 5 to 15
- NZ Invoice Chaser for n8nNZ wording and GST