Tax bracket interpolation

Example model

Tax bracket interpolation.png

Description: Computes amount of tax due from taxable income for a 2017 US Federal tax return. To match the IRS's numbers exactly, it is necessary to process tax brackets correctly as well as implementation a complex mix of rounding rules that reproduce the 12 pages of table lookups from the Form 1040 instructions. This model is showcased in a blog article, How to simplify the IRS Tax Tables.

Author: Lonnie Chrisman, Lumina Decision Systems

Download: Tax bracket interpolation 2021.ana

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