Methodology, assumptions, and sources
Life Calculators builds tools and editorial pages to help Australians make practical decisions. We rely on primary sources where possible, state key assumptions clearly, and treat results as informational estimates rather than personal advice.
How we approach calculations
We start with the core decision a page is trying to support, then build the simplest useful model around it. For tax, salary, and benchmark pages, that usually means standard public rules, public datasets, and clearly stated assumptions.
Update cadence
We review methodology and benchmark pages when tax rules, source data, or benchmark releases materially change. Update timing varies by source publication cycle.
Corrections and contact
If you spot an issue with a formula, source, or assumption, contact us and include the page URL and the detail you think needs correction. We would rather fix a weak assumption than quietly leave it in place.
How this page works
Life Calculators builds tools and comparison pages from public data, primary sources, and standard formulas wherever possible.
Methodology
- Start with a clear problem and define the calculation or comparison model.
- Use primary sources first, especially government and official statistical publications.
- State assumptions and limitations in plain English near the relevant page.
- Review pages when source data or rules materially change.
Assumptions
- Many pages simplify real-world rules so results stay understandable and useful.
- Outputs are informational estimates and should not replace professional advice.
Limitations
- Some calculators rely on broad benchmark inputs where exact personal data is unavailable.
- Source publication cycles vary, so not every benchmark updates at the same time.
Sources
- Australian Taxation Office – Individual income tax ratesAustralian Taxation Office · Resident individual income tax rates and thresholds.
- Australian Taxation Office – What is the Medicare levy?Australian Taxation Office · Overview of the standard Medicare levy and how it applies.
- Australian Bureau of Statistics – Average Weekly Earnings, AustraliaAustralian Bureau of Statistics · Average weekly earnings benchmark data.
- Australian Bureau of Statistics – Employee Earnings and Hours, AustraliaAustralian Bureau of Statistics · Employee earnings by geography, occupation, and industry.
Last updated
17 March 2026
LifeCalculators provides independent modelling tools based on publicly available data and standard formulas. Results are estimates only and are not financial advice.