## Three checks
1) Recompute with a second tool or hand math on a simplified case. 2) Bound: double the input — does output roughly scale as expected? 3) Authority: compare to Australia guidance (ATO — PAYG educational; super is employer cost not deducted here.). This site uses model au-payg-super-not-employee and currency AUD for education, not as a legal determination.
## When to stop using a web calculator
Court orders, multi-state taxation, equity compensation cliffs, and regulated advice situations need professionals. Use Net salary, Mortgage payment, or Income tax to prepare questions — not to replace a licence.
---
Note: Educational content from Calcly Australia. Official sources (ATO — PAYG educational; super is employer cost not deducted here.) and licensed professionals take priority in Australia.