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Internal revenue code conformity by state

Understand how each state aligns with the Internal Revenue Code and what HR teams must know to reduce compliance risk.

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by Alice Gilman

Understanding how each state aligns with the federal Internal Revenue Code (IRC) is essential for HR and payroll teams managing multi‑state compliance. States vary widely in their approach: some adopt the current federal definition of wages automatically, while others follow an earlier version of the IRC or apply their own exceptions to certain types of income or benefits. Because taxable wage definitions form the basis for accurate withholding, employers must know exactly which version of the IRC each state uses.

Our Fifty state chart for Internal revenue code conformity offers HR and payroll professionals a clear, consolidated view of each state’s IRC conformity status. This comprehensive comparison helps organizations quickly identify how wage definitions differ across jurisdictions, stay ahead of compliance changes, and ensure accurate payroll operations.

Designed to support employers with diverse and distributed workforces, the chart provides a streamlined way to reduce risk, improve compliance accuracy, and navigate evolving tax rules with confidence.

Screenshot of the Brightmine Fifty State Chart for internal revenue code conformity laws

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Latest updates

Updated to reflect OBBBA related nonconformity exceptions in Iowa.

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