GSGood Sheets

SA302 Summary Builder

Reproduce your tax calculation before you file.

Works through the tax computation the way HMRC does — income, allowances, bands, National Insurance — so you can sanity-check the figure HMRC gives you rather than taking it on trust.

What's in it

  • Full income tax band computation
  • Class 2 and Class 4 National Insurance
  • Comparison against HMRC's own figure

Formats

Microsoft Excel

An .xlsx file you download and keep. Works in Excel 2016 and later, and in Numbers and LibreOffice.

Google Sheets

Import the .xlsx into Google Sheets — a native Sheets version of this one is on the way.

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