About My Tax Calculator

Sources and content checks

Current guidance is checked against the official sources linked on each page. The dated content check describes a source and implementation review, not verification by an identified accountant. No named professional reviewer or independently verified credentials are currently published.

Independence and limitations

This is an independent website, not HMRC, and it is not endorsed by HMRC. Calculations simplify tax rules and can differ from payroll or a formal tax return. Income estimates use England, Wales and Northern Ireland bands, not Scottish bands. Selected pension methods model basic tax treatment but not all eligibility, allowance charges or payroll effects. General and AI-generated guidance is not professionally verified advice. Confirm important decisions using official guidance or a qualified adviser.

Official sources

• GOV.UK: Income Tax rates and Personal Allowances
• GOV.UK: Employer rates and thresholds 2026/27