Maket

Excel models for US payroll and tax, shipped with the tests that prove them

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Maket builds Excel models for US payroll and tax work, and ships each one with the evidence that its figures are right.

Every model arrives with three things a reviewer can use: the Python calculation engine that generated the figures, the test suites that exercise it, and a verification log in which each number is traced to the published document, page and date it came from. A parity test proves that the workbook and the engine agree to the cent across every scenario, including the awkward ones, such as the top marginal band and a wage base crossed in the middle of a pay period. A year-over-year regression test runs the new year against the old and fails loudly if a constant was left un-updated.

The workbooks themselves are built to be audited rather than trusted. Every formula is visible, every cell is editable, no sheet is protected, and there are no macros and no add-ins. The source for every rate is named on the face of the tab that uses it.

Scope is stated before purchase rather than after. Where a jurisdiction is not covered, the model says so instead of returning a figure.

Maket is an independent software author, not a CPA, an enrolled agent or an attorney, and nothing it sells is tax, legal or accounting advice.

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