Illinois Overtime Calculator
Illinois overtime is usually a weekly calculation: identify the hours worked over 40 in a workweek for a covered nonexempt employee, pay those hours at one and one-half times the regular rate, and add that amount to straight-time pay. This Illinois overtime calculator estimates the gross wage result after you enter regular pay, regular work time, overtime multiplier, and overtime hours.
The current form is flexible rather than automatic. It does not inspect each week in a month, classify exemptions, or split regular and overtime hours for you. That flexibility is useful when a pay stub already shows regular and overtime buckets, but it also means the inputs must be prepared carefully. Illinois overtime should not be averaged across workweeks just because payroll is biweekly, semimonthly, or monthly.
Illinois overtime rule summary
The Illinois Department of Labor’s minimum wage and overtime materials state that nonexempt employees generally must be paid overtime at one and one-half times the regular rate for hours worked over 40 in a workweek. That is a weekly threshold. Illinois does not have the broad California-style daily overtime rule for the usual private-sector hourly worker. If someone works 10 hours on Monday, 6 hours on Tuesday, and 8 hours on the remaining weekdays, the long Monday by itself is not the ordinary trigger; the total weekly hours are the key.
Illinois law still has its own enforcement structure, exemptions, and worker-rights materials. Federal FLSA rules also apply to many employers. When both state and federal law apply, the more protective rule can matter. This page is informational, not legal advice; wage orders, exemptions, public-sector rules, union contracts, and updated agency guidance can change the correct answer.
How to use the calculator correctly
Enter Regular pay as the gross hourly rate before overtime. Enter Regular work time as the hours paid at that regular rate. Enter Overtime pay multiplier, usually 1.5. Enter Overtime hours as the hours paid at the premium rate. The calculator then returns total regular pay, overtime hourly pay, total overtime pay, regular work time, overtime hours, and total pay for the period.
The default form values are $15.00, 160 regular hours, 1.5×, and 10 overtime hours. That can model a payroll-period summary, but Illinois overtime law is still checked week by week. If a month has four weeks of 40 hours plus one separate week with 10 overtime hours, the input is reasonable for a summary. If one week has 50 hours and another has 30, do not average them to 40 and erase the overtime. For planning, connect the result to the overtime calculator, salary-with-overtime calculator, hourly-to-salary calculator, and budget calculator.
Formula
The calculator uses these formulas:
It displays the regular and overtime hour quantities so the payroll-period summary can be checked against the source timesheets.
Worked example using the default inputs
Using the default Illinois inputs, the regular hourly pay is $15.00, the regular work time is 160 hours, the overtime multiplier is 1.5×, and overtime hours are 10. The overtime hourly pay is $15.00 × 1.5 = $22.50. Total regular pay is $15.00 × 160 = $2,400.00. Total overtime pay is $22.50 × 10 = $225.00. Total pay for the period is $2,625.00.
The form’s note should match that result: Illinois overtime is commonly time and a half, so $15.00 × 1.5 = $22.50 per overtime hour. The primary result is $2,625.00 because the calculator adds $2,400.00 of regular pay and $225.00 of overtime pay.
For a cleaner weekly example, suppose an employee earns $20.00 per hour, works 40 regular hours, and has 5 overtime hours. Regular pay is $800.00. The overtime rate is $30.00. Overtime pay is $150.00. Weekly gross pay is $950.00. That example mirrors the Illinois weekly threshold more directly.
Exempt and nonexempt employees
Illinois overtime generally protects nonexempt employees. Exemptions can include executive, administrative, professional, outside sales, certain agricultural, and other categories, but the details depend on actual work and pay rules. The word “salary” is not a complete answer. A salaried employee can still be nonexempt if the duties and salary tests are not met.
Regular rate issues also matter. Nondiscretionary bonuses, commissions, shift differentials, or other compensation may affect the rate used for overtime in some cases. If your pay stub shows an overtime rate that is not exactly 1.5 times your base hourly wage, ask whether payroll included another form of compensation in the regular rate or used a special rule. Conversely, if the pay stub averages hours across weeks, that can be a warning sign.
Recordkeeping checklist
Keep daily hours, the employer’s workweek definition, pay stubs, wage notices, and written policies. Separate each workweek before summarizing a longer pay period. If a paycheck differs from this estimate, compare the regular-hour total, overtime-hour total, hourly rate, overtime rate, and deductions separately. Contact the Illinois Department of Labor, the U.S. Department of Labor, payroll counsel, or a qualified employment attorney for legal advice.
Sources
- Illinois Department of Labor, Minimum Wage/Overtime FAQ — state FAQ covering Illinois overtime basics and exemptions.
- Illinois Department of Labor, Employees: Worker Rights — IDOL worker-rights resources and wage information.
- U.S. Department of Labor, Overtime Pay — federal FLSA overtime overview.
- U.S. Department of Labor, Wages and the Fair Labor Standards Act — federal wage-and-hour and exemption background.