Observed arrival · 2026-09-02
PayeRewind — replay a tax year and see what your tax code cost you
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A browser-based PAYE checker that reconstructs UK tax years from an HMRC income-tax history page and compares what you owed with what payroll deducted.
Field notes
The workflow depends on copying the text of HMRC’s income-tax history page, which reportedly lists five years of employments, taxable income, tax paid, and tax codes. Rewind then compares an annual liability calculation—excluding the tax code—with a reconstruction of payroll deductions across the codes used. The page specifically flags non-cumulative W1/M1/X codes, BR/D0/D1 second-job codes, K codes, and allowance taper estimates between £100,000 and £125,140.
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