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Widgets and the API run the same calculation against the same tax data, so everything on this page applies to both integration paths.

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Stateless calculations

Calculations are stateless: CBS takes your inputs, runs the calculation, and returns the result. It does not persist calculation inputs or results to a database, and it holds no session state between requests. A widget calls the same API, so the same is true whichever path you use.

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Where accuracy comes from

CBS tax calculations are performed by the Symmetry Tax Engine against Symmetry’s maintained tax data, so a CBS result matches what the engine returns for the same inputs. Monetary results are returned to the cent (two decimal places). Because tax tables change over time, pin an explicit checkDate when you need a repeatable result. See Test calculations against known values.