il-payrollAccountant-reviewed Tier 2 Illinois content skill for employer payroll compliance covering tax year 2025. Includes the 4.95% flat PIT, supplemental 4.95%, IL-941 quarterly withholding, IL UI wage base $13,590 with rates 0.85-8.65%, the Secure Choice Savings Program auto-enroll mandate for 5+ employees (5% default deferral if no qualified retirement plan offered), Chicago Fair Workweek Ordinance predictive scheduling for 10+ employees in covered industries, Cook County paid sick leave, and the One Day Rest in Seven Act.