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About StateTaxAdd

StateTaxAdd exists for one job: help someone estimate US sales tax from a statewide base rate, with an optional typical local combined rate, and reverse a tax-included total when needed.

StateTaxAdd is maintained by Ultra Edge Labs. The calculator runs in your browser without an account. It uses a published January 1, 2026 rate snapshot rather than a live tax service. Read how the figures are compiled on the methodology page and compare all values in the state rates table.

It is also a limitation. If you need invoice-ready, ZIP-level, product-aware collection, use registered software or a qualified professional. We say that on every calculation surface.

Questions and rate corrections: [email protected]. Please use an illustrative amount rather than sending a private invoice.