2025 to 2026 Legislature · State Senate bill

SB 859

Relating to: adopting changes to the federal Internal Revenue Code for state tax purposes and modifying administrative rules related to such changes. (FE)

In committee Last action March 23, 2026: Failed to pass pursuant to Senate Joint Resolution 1

Official bill page and text: docs.legis.wisconsin.gov

Sponsors 1

Prime sponsor

Marklein

Status

In committee as of March 23, 2026. The 2025 to 2026 Legislature serves until the 2027 Legislature convenes on January 4, 2027.

Referred to: Joint Finance, Senate Agriculture and Revenue (from the official referral record)

Roll-call votes 0

No roll-call votes recorded for this measure.

Timeline 14

Date	Chamber	Action
March 23, 2026	Senate	Failed to pass pursuant to Senate Joint Resolution 1
February 10, 2026	Senate	Report of Joint Survey Committee on Tax Exemptions received, Ayes 8, Noes 1
February 4, 2026	Senate	Report of Joint Survey Committee on Tax Exemptions requested
February 3, 2026	Senate	Report passage recommended by Joint Committee on Finance, Ayes 15, Noes 0
February 3, 2026	Senate	Executive action taken
February 3, 2026	Senate	Withdrawn from committee on Senate Organization and rereferred to joint committee on Finance pursuant to Senate Rule 46(2)(c)
February 3, 2026	Senate	Available for scheduling
February 3, 2026	Senate	Report passage recommended by Committee on Agriculture and Revenue, Ayes 8, Noes 0
February 3, 2026	Senate	Executive action taken
February 3, 2026	Senate	Available for scheduling
January 28, 2026	Senate	Public hearing held
January 28, 2026	Senate	Fiscal estimate received
January 16, 2026	Senate	Read first time and referred to Committee on Agriculture and Revenue
January 16, 2026	Senate	Introduced by Senator Marklein; cosponsored by Representative Wittke

Data: Open States (bulk data, October 1, 2026 monthly extract, which has no roll-call tallies; public data, attribution appreciated). Official record: docs.legis.wisconsin.gov. Bill pages link to the official text, not copied.