Illinois Finance Guide Built on 2026 Tax Research

Your first Illinois payroll runs through two agencies, not one

Illinois splits payroll administration in a way that surprises owners arriving from single-department states. Income tax withholding belongs to the Illinois Department of Revenue, reported on Forms IL-941 and IL-501. Unemployment insurance belongs to the Illinois Department of Employment Security, filed quarterly on Form UI-3/40. Both run through the MyTax Illinois portal, but they are separate accounts with separate notices.

New hires must be reported to the Illinois New Hire Directory within 20 days. Missing that window carries a $500 penalty per report.

Unemployment insurance is the one state payroll tax and employees pay none of it. The 2026 taxable wage base is $14,250 per employee and the new-employer rate is roughly 3.35%, though third-party sources publish conflicting figures. The only number that governs your account is the one on the annual Notice of Contribution Rate from IDES. Because the wage base is about double the federal FUTA base, unemployment tax is a bigger line in an Illinois payroll budget than newcomers expect.

One more registration to check: employers above the applicable size threshold that offer no retirement plan must facilitate Illinois Secure Choice. The state does not require employer contributions, but employee deferrals come out through payroll and appear as a deduction.

Which of three wage floors applies depends on where the forklift rolls

The statewide minimum wage is $15.00 an hour with a $9.00 tipped cash wage. It has no automatic inflation adjustment. Chicago sets its own rate at $17.05 and Cook County outside Chicago sets $15.40, both adjusted each July 1. A Joliet warehouse in Will County pays the state rate.

Two rules catch employers off guard. Chicago's two-hour rule entitles anyone who works at least two hours inside city limits in any two-week period to the Chicago rate for those hours, which matters for drivers and field crews. And more than 80% of Cook County municipalities have opted out of the county ordinance, so $15.40 applies only after you confirm the specific town.

Overtime follows the federal standard, 1.5 times the regular rate after 40 hours in a workweek, with no daily overtime. The One Day Rest in Seven Act adds 24 consecutive hours of rest in every seven-day period plus a 20-minute meal break for every 7.5 hours worked, starting no later than five hours into the shift. The Paid Leave for All Workers Act gives most employees at least 40 hours of paid leave per 12-month period, accrued at one hour per 40 hours worked. Final pay is due by the next regular payday whether the employee quit or was let go.

Seven items every earnings statement must carry since 2025

Public Act 103-0953 amended the Illinois Wage Payment and Collection Act on January 1, 2025. Every statement must now show hours worked, rate of pay, overtime pay, overtime hours, gross wages, deductions and year-to-date totals of wages and deductions. The available paid leave balance must appear on the statement or alongside it.

The trap is the hours field. Illinois has no carve-out for salaried exempt staff, so hours worked must be recorded for them too. Statements must be kept three years, copies furnished within 21 calendar days of a request, with a cap of two requests per employee per 12 months. Employers that deliver statements only electronically must document an offer of the previous year's statements to departing workers. Penalties reach $500 per violation on top of existing damages.

Once wages and deductions are verified, the Illinois pay stub generator lays those seven items out in the required shape. The year-to-date columns must continue from prior periods rather than restart, a point covered in the explanation of what YTD means on a paycheck.

Now the employee's side: what 4.95% actually does to a check

Illinois taxes individual income at a flat 4.95%, a rate in place since July 2017. The flat structure is constitutional, not merely legislative: the state constitution has required a non-graduated income tax since 1969 and voters rejected a 2020 amendment that would have allowed brackets. No city or county adds a local income tax, Chicago included.

Withholding runs through Form IL-W-4, not the federal W-4. Each allowance is worth the $2,925 personal exemption for 2026, with an extra $1,000 for a taxpayer or spouse who is 65 or older or legally blind. The exemption disappears once federal adjusted gross income passes $250,000 for a single filer or $500,000 on a joint return. Retirement income is fully exempt, so pensions, 401(k) withdrawals and Social Security carry no Illinois line at all.

A Joliet forklift operator, paid every two weeks

Picture a forklift operator at a Joliet distribution center earning $27 an hour for a 40-hour week, paid biweekly and filing single with one IL-W-4 allowance. The Illinois paycheck calculator produces this breakdown under 2026 rules.

Figures come from the Online Paystub Illinois paycheck calculator for 2026. Local taxes, health premiums and retirement contributions are not included.

The Illinois line lands close to 4.95% of gross once the single allowance is stripped out, which is the signature of a flat tax. Everything else on the check is federal. A raise would move the state line in a straight line rather than pushing anyone into a higher bracket.

Commuters from four neighbors skip Illinois withholding; two do not

Illinois has wage reciprocity with Iowa, Kentucky, Michigan and Wisconsin. A resident of one of those states who works in Illinois files Form IL-W-5-NR with the employer and pays income tax only at home. Indiana and Missouri are missing from that list, so commuters from those states have Illinois tax withheld and claim a credit on their home return.

Reciprocity covers wages, salaries, tips and commissions, not business or rental income from Illinois sources. Nonresidents whose work is not localized in Illinois become subject to withholding on an allocated share after more than 30 working days of significant service in the state, with Form IL-W-6 documenting the days. Illinois residents taxed twice on the same income use Schedule CR for a credit.

What the register adds after the paycheck is spent

The state sales tax on general merchandise is 6.25%. Municipalities, counties and transportation districts stack up to 4.75% more, so combined rates reach 11% in some locations and 10.25% in Chicago, the highest of any major American city. Rates can change on January 1 or July 1, so the Department of Revenue points retailers to the MyTax Illinois Tax Rate Finder rather than any statewide average.

Two 2026 changes matter at checkout. The state 1% grocery tax ended on January 1, 2026, though a municipality or county can impose a local 1% grocery tax by ordinance and transportation district taxes on food can remain. The 200-transaction nexus test for remote sellers also ended, leaving a single $100,000 gross receipts threshold. Qualifying drugs and medical appliances stay at a 1% state rate, while the service component of a service sale is generally not taxed. Retailers report on Form ST-1 by the 20th of the month after the period ends.