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Payroll tax data with receipts.

Federal, 50 states and DC in one API
Every tax linked to its official source
Human-approved, immutable versions
Free Sandbox — no credit card

Effective-dated US payroll tax data, sourced from official publications and approved by people before it reaches your paychecks.

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Pricing Coverage How it works Status

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Quickstart API reference Playground OpenAPI spec

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© 2026 RateBook by iTensia. All rights reserved.Tax data is provided for payroll calculation and is not legal or tax advice. Always confirm unusual cases with the issuing agency.