ID H0445

Amends Idaho Code Section 63-3045 to prohibit interest accrual on income tax deficiencies during the audit period from when the state tax commission sends written notice that an audit is being initiated until the notice of deficiency determination is issued.

Prohibits interest accrual on income tax deficiencies during the protest period between issuance of a notice of deficiency determination subject to a perfected protest and the final determination by the state tax commission after disposition of the protest.

Amends Idaho Code Section 63-3632 to align sales tax deficiency interest provisions with the income tax deficiency interest calculation methods and timing in Section 63-3045.

Declares an emergency and applies the act retroactively to January 1, 2024.