Trust and accountability
Editorial and corrections policy
How we source, review and correct tax information. Last updated .
Source hierarchy
Numerical tax claims are checked against primary public sources: HMRC and GOV.UK guidance, Scottish Government publications, and legislation where guidance is insufficient. Article pages list the sources used for their latest review. Secondary commentary may help us find an issue but is not the authority for a rate or threshold.
Calculator review
Tax-year data records its effective dates, official source URLs and verification date in the codebase. Boundary tests use independently written expected figures so changing a production constant cannot silently rewrite the expected answer. The current calculator is an annual estimator, not payroll software.
Editorial review and authorship
Guides are maintained by the AfterTaxCalculator editorial team. A “last reviewed” date means the claims and sources described in the visible review note were checked on that date. It does not imply review by a regulated tax adviser. We do not publish invented author identities or credentials; named professional reviewers will be added only when a real reviewer has approved the material.
Corrections
Material errors are corrected in the calculator, affected explanations and tests together. The article's review note and modification date are updated only after a substantive check. Spelling or layout changes do not receive a new tax-review date.
Limitations
The calculator annualises income and applies annual thresholds. Actual payslips can differ because PAYE, National Insurance and student loans operate through payroll periods and can involve cumulative tax codes, irregular pay, rounding, benefits and circumstances not modelled here. Content is educational and is not personal financial, tax or legal advice.
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