About

What this site is

Ozisuma (ozisuma.com) is an independent project that builds Australian-specific calculators for everyday financial questions: stamp duty across the eight states and territories, HECS-HELP repayments, superannuation projections, working holiday tax, crypto tax, take-home pay, and the running cost of property and life in AUD.

The focus is the detail that the big bank calculators and the official ATO/Revenue NSW tools usually skip — first-home concessions, foreign-purchaser surcharges, off-the-plan rules, state-by-state comparisons — with the source rate card linked on every page.

Every calculation runs in the browser. Your inputs are never sent to a server.

Who runs it

• Editor: Kojok
• Email: [email protected]
• Launched: 2026

Editorial policy

• Formulas are built from official sources: ATO, Revenue NSW, SRO Victoria, QRO Queensland and equivalent state revenue offices, ABS, RBA, and published award documents. The source is cited at the bottom of every calculator page.
• Every calculator has unit tests. Calculators do not ship until the tests pass.
• For Your-Money-Your-Life topics (tax, mortgages, super, health) the site gives general estimates only and points readers to a registered tax agent, mortgage broker or licensed adviser before they act on the figure.
• Rate tables and thresholds are reviewed against the official source at the start of each Australian financial year (1 July) and the page's "Updated" date is bumped accordingly.
• Where a link is an advertisement or an affiliate link, it is labelled clearly.

How the site is funded

The site is funded by Google AdSense and by affiliate programs relevant to the calculator on the page (mortgage brokers, conveyancers, comparison sites, accounting software). Disclosure detail is in the Privacy policy.

Contact

To suggest a new calculator, report a wrong rate or a broken formula, please use the contact page.