Editorial and corrections policy
Responsibility and review
Publisher: Adrien de Malherbe. Automated tools assist with calculations, development and drafting. Automated checks establish internal consistency; they do not constitute an independent tax or statistical review. No independent professional certification is claimed.
Evidence standards
- Link to the exact official reference when a parameter is checked against it.
- State geography, reference period and population; do not present employee wages as household income.
- Mark modeled inputs and unresolved provenance plainly.
- Distinguish content updates from data observation dates.
- Publish assumptions and sensitivity ranges alongside comparisons.
Report an error
Send a correction to the publisher with the page URL, disputed figure, scenario and supporting source. Do not send payslips or sensitive personal documents. Material corrections are recorded below after verification.
Model and editorial changes
5 October 2026: version 2026-10-05.1
- Corrected UK employee National Insurance to banded 8% and 2%, and implemented the personal-allowance taper above £100,000.
- Aligned the published score weights with the calculation model.
- Aligned static Salary Swap equivalence tables with the interactive breathing-room solver.
- Published a source register identifying unresolved cost and percentile provenance.
- Published a five-city net-income scenario report with machine-readable outputs.
- Clarified browser-local input storage and the scope of household and employment controls.