IllinoisPaid Sick Leave Laws & Requirements (2026)

What Illinois Business Owners Need to Know

• •Illinois's Paid Leave for All Workers Act (PLAWA) requires all employers to provide 40 hours of paid leave per year.
• •Unique feature: employees can use paid leave for ANY reason — no documentation or explanation required.
• •Accrual rate: 1 hour per 40 hours worked.
• •Chicago and Cook County have separate, often stricter, paid sick leave ordinances.

How do you comply with Illinois sick leave law?

Since Illinois mandates paid sick leave, employers must take specific steps to comply. Violations can result in fines, employee lawsuits, and reputational damage. Follow these five steps to make sure your business meets its obligations.

1. Create a written sick leave policy. Put your sick leave policy in writing and distribute it to every employee. The policy should clearly state how sick time is accrued (or front-loaded), the maximum accrual and usage caps, which reasons qualify for sick leave use, how employees should request time off, and what documentation (if any) is required. Include the policy in your employee handbook and have employees sign an acknowledgment. A clear, written policy is your best protection against misunderstandings and disputes. In Illinois, your policy must meet or exceed the state minimums: accrual at 1 hour per 40 hours worked, with a usage cap of 40 hours per year. You can always offer more than the minimum.
2. Track accrual accurately in your payroll system. If you use an accrual model (rather than front-loading hours), your payroll system must calculate and display sick leave balances on each pay stub or provide regular balance statements. Most modern payroll platforms (Gusto, ADP, QuickBooks Payroll) have built-in sick leave tracking. Make sure the accrual rate, caps, and carryover settings match Illinois's requirements. Audit your settings whenever the law changes.
3. Provide notice to employees about their rights. Illinois requires employers to inform employees of their sick leave rights. This may include posting a workplace notice, providing written notification at the time of hire, and showing accrued/used sick leave on pay stubs. Check the Illinois Department of Labor website for any required poster or notice templates. Displaying the correct poster is a low-effort step that demonstrates compliance in any audit.
4. Do not retaliate against employees who use sick leave. This is critically important. It is illegal in virtually every jurisdiction to discipline, demote, reduce hours, or terminate an employee for using sick leave they are entitled to take. Retaliation claims are among the most common employment law complaints, and they can be expensive to defend. Train managers and supervisors to understand that using sick leave is a protected right — not a performance issue. Document any performance or attendance concerns separately from sick leave usage.
5. Keep records for the required retention period. Maintain records of sick leave accrual, usage, and balances for each employee. Illinois typically requires these records to be kept for at least three years, though some jurisdictions require longer. Records should include dates of sick leave taken, hours used, and the running balance. These records are your defense if a former or current employee files a complaint claiming they were denied sick leave.

Can employers in Illinoisrequire a doctor's note for sick leave?

Whether you can require medical documentation depends on your state law, local ordinances, and the length of the absence. Here is what employers generally need to know:

• •Short absences (1-2 days): Most state sick leave laws prohibit employers from requiring a doctor's note for absences of fewer than three consecutive days. Requiring documentation for a single sick day discourages employees from using leave they are entitled to and can be interpreted as retaliation or an attempt to circumvent the law.
• •Extended absences (3+ consecutive days): After three or more consecutive days of absence, many state laws do allow employers to request reasonable documentation that the leave was used for a covered purpose. "Reasonable documentation" typically means a note from a healthcare provider confirming the employee was seen — it does not need to disclose the specific diagnosis or medical details.
• •Some states prohibit it entirely: A handful of jurisdictions prohibit employers from requiring any medical documentation for sick leave, regardless of the duration. Check Illinois's specific law for the exact rules. If your state is silent on the issue, you have more flexibility, but best practice is to apply any documentation policy consistently and not target specific employees.
• •Cost considerations: If you do require a doctor's note, consider who bears the cost. Requiring an employee to visit a doctor and pay a copay just to take a single sick day can be seen as penalizing sick leave use. Some employers reimburse the cost of the visit when they require documentation. At a minimum, do not require documentation from a specific provider — accept notes from urgent care clinics, telehealth providers, or any licensed practitioner.

Regardless of the legal requirements, apply your documentation policy uniformly to all employees. Selectively requiring notes from certain employees but not others can give rise to discrimination claims.

What happens to unused sick leave when an employee leaves in Illinois?

One of the most common questions employers have is whether they must pay out accrued but unused sick leave when an employee resigns, is terminated, or is laid off. The answer depends on your state law, your company policy, and whether you offer standalone sick leave or a combined PTO plan.

• •Most states do not require sick leave payout. Unlike vacation time (which many states require to be paid out upon separation), standalone sick leave is typically a "use it or lose it" benefit. In the majority of states, including most that mandate paid sick leave, employers are not required to pay out unused sick leave when an employee departs.
• •Combined PTO may change the rule. If you offer a combined PTO plan (where sick leave and vacation are in a single bucket), the payout rules for vacation may apply to the entire balance. In states that require vacation payout, this means your combined PTO balance could become payable at separation. This is an important consideration when designing your leave policy — keeping sick leave and vacation separate can reduce your payout obligations.
• •Reinstatement upon rehire. Many state sick leave laws require employers to reinstate an employee's previously accrued sick leave balance if the employee is rehired within a specified period (typically 6 to 12 months). This means you should retain sick leave records even after an employee leaves, in case they return.
• •Check your own policy. Even if the law does not require a payout, your written company policy might. If your employee handbook states that unused sick leave is paid out at separation, that becomes an enforceable obligation. Review your policy carefully and make sure it says what you intend.

What is the difference between sick leave and PTO in Illinois?

Many employers wonder whether they can satisfy sick leave requirements by offering a general Paid Time Off (PTO) plan instead of a separate sick leave policy. The short answer is: usually yes, but only if the PTO plan meets all of the requirements of the sick leave law.

• •PTO can satisfy sick leave requirements if it meets the minimums. In Illinois, your PTO plan must accrue at least as fast as the required sick leave rate (1 hour per 40 hours worked), allow use for all the same covered reasons (illness, medical appointments, domestic violence, etc.), and follow the same rules about carryover, usage caps, and anti-retaliation. If your PTO plan meets all of these conditions, you do not need a separate sick leave bucket.
• •The key differences between sick leave and PTO. Standalone sick leave is typically restricted to health-related absences and is often "use it or lose it" (no payout at separation). PTO is more flexible — employees can use it for vacations, personal days, or any reason — but it may trigger vacation payout obligations at separation. PTO also tends to accrue at a higher rate since it replaces multiple leave categories.
• •Pros and cons for employers. A combined PTO plan is simpler to administer (one balance to track) and gives employees more flexibility, which can improve morale and reduce unscheduled absences. However, it can increase payout costs at termination, and employees may hesitate to "waste" PTO on sick days, potentially coming to work sick. A separate sick leave policy avoids payout issues and encourages employees to stay home when ill, but requires tracking two accrual balances.
• •Front-loading vs. accrual. Many employers prefer to front-load the full annual sick leave allowance at the beginning of each year (or on the employee's hire anniversary) rather than tracking hour-by-hour accrual. Front-loading simplifies administration and is permitted in most states that mandate sick leave, provided you give at least the minimum required hours upfront. Check whether Illinois allows front-loading and whether it eliminates the carryover requirement (in many states, front-loading removes the obligation to carry over unused hours).

Frequently Asked Questions

Official Illinois Resources

• Illinois Paid Leave for All Workers Act
• Illinois PLAWA FAQ