Louisiana Amends Estimated Income Tax Underpayment, Overpayment Procedures

The Louisiana Governor signed a law amending the state’s estimated income tax underpayment and overpayment adjustment provisions for both individuals and corporations. The law includes: 1) reducing the required estimated tax payment threshold from 90 percent to 70 percent; 2) modifying the underpayment period calculation; 3) repealing certain exemption calculations; and 4) updating corporate overpayment adjustment procedures and penalties. The law took effect May 22. [H.B. 633, enacted 05/22/26]