Indiana Proposed Changes to Income Tax Regulations
State officials have introduced amendments covering residency, business income, and local tax administration.
Updated on Sept. 28, 2026 in Taxes
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The Indiana Department of Revenue has issued proposed regulatory changes for adjusted gross income and local income taxes. These amendments address complex areas including residency, domicile, and business income allocation.
Why it matters
The proposal aims to modernize tax compliance and administrative clarity for businesses and residents throughout Indiana. Updates to withholding requirements and apportionment rules will impact how various entities manage their state tax obligations.
The Department of Revenue issued these proposed regulations under sections 45 IAC 3.1-1-1 and 45 IAC 3.1-1-2. These rules specifically outline new frameworks for sales factor attribution and withholding for S corporations and trusts.
The players
Indiana Department of Revenue
This state agency is responsible for the administration and enforcement of tax laws and regulations within Indiana.
The details
The proposed amendments modify how businesses classify income and calculate apportionment, directly affecting how entities determine their tax liability. Additionally, the changes refine administration for local income taxes and residency definitions to ensure consistent application across the state.
Timeline
September 23, 2026: The Indiana Department of Revenue issued the proposed regulations.
October 23, 2026: The deadline for the public to submit comments on the proposed rules.
Market Dynamics
These updates to the Indiana Administrative Code 45 IAC 3.1 reflect a broader regulatory shift toward aligning state tax policies with evolving business structures. The move parallels national trends where states seek to clarify apportionment rules as digital and multi-state commerce grows.
The proposed changes will directly affect how business owners, trusts, and S corporations manage their state withholding requirements. Residents and business entities should review these updates to ensure compliance with the modified residency and income classification rules.
The takeaway
Taxpayers should review the proposed regulatory language to determine how shifts in domicile and apportionment rules impact their specific financial situations. Engaging with the formal comment process by the October deadline is the primary way for stakeholders to influence the final rules.
What happens next
The public comment period is open until October 23, 2026, after which the Department of Revenue will review feedback before finalizing any regulatory adjustments.
Further reading
For more information on current state tax policies and filings, visit the Indiana Taxes section.
Live Poll
Do you support the proposed changes to local income tax rules in your state?
