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5 offline money tools for Australian sole traders

Running a one-person business means doing the same five money calculations over and over. Each of the guides below explains one of them for free.

The five jobs

  1. What to charge, and how much tax to set aside. See how much should I charge as a sole trader.
  2. Pricing products after fees and GST. See markup vs margin.
  3. Getting paid on time. See overdue invoice reminder emails.
  4. Work-from-home and car claims. See WFH and car deductions.
  5. Splitting rent and bills fairly. See how to split rent fairly.

Why offline tools?

Each tool is a single HTML file that runs in your browser with no login, no subscription and no internet connection. Your numbers stay on your device. The 2026-27 ATO figures were checked on ato.gov.au in November 2026.

Free tip: Pick one day a month (say, the first Monday) as your money admin day: chase invoices, log expenses and move tax savings. Thirty minutes a month beats a lost weekend in June.
Free calculator:

Want it done for you? Aussie Biz Kit Tools Bundle: 5 offline calculators

All five tools in one download: the Sole Trader Toolkit, the Price, Markup & Margin Calculator, the Late Payment Chaser, the WFH & Car Deduction Estimator and the Fair Rent & Bills Splitter.

  • Bought separately on Whop the five cost US$46.95
  • Works in any browser on computer, tablet or phone
  • No login, no subscription, no internet
  • Free updates for the 2026-27 year

US$24.99 one-time on Whop. Instant download.

See it on Whop →

Related guides

General information only, not financial, tax or legal advice. Check the official pages linked above, or ask a registered tax agent, before you rely on anything here. Last checked 16 Nov 2026.