Taxes, Excise - As enacted, authorizes, subject to certain provisions, a taxpayer, at the taxpayer's discretion, to add back to net earnings certain deductions and to subtract certain amounts. - Amends TCA Section 67-4-2006.

SB 439 allows Tennessee businesses to adjust their taxable income by adding back certain deductions or subtracting specific amounts from their net earnings, as determined by the taxpayer. This change directly affects businesses calculating corporate income tax under Tennessee Code Annotated Section 67-4-2006. The bill also requires the state Department of Revenue to study the economic impact of these adjustments and report findings to lawmakers by January 2026. The bill became law as Public Chapter 343 in May 2025.