Illinois Unemployment Insurance Tax is an employer-paid payroll tax used to fund unemployment benefits for eligible workers. Employers covered by the Illinois Unemployment Insurance Act report employee wages and pay unemployment insurance contributions to the Illinois Department of Employment Security, or IDES.
For 2026, Illinois does not use one unemployment tax rate for every employer. Experience-rated employers can have contribution rates ranging from 0.750% to 7.050%.
Most newer employers use a 3.350% entry rate, while qualifying new employers in Administrative Support and Waste Management, NAICS sector 56, have a 3.450% entry rate. The 2026 taxable wage base is $14,250 per employee.
Employers need to track more than the rate itself. Illinois also has experience-rating rules, quarterly contribution reports, special monthly wage reporting requirements for larger employers, a Fund Building Rate, remote employee coverage rules, and penalties for late reporting or payment.
What Is Illinois Unemployment Insurance Tax?
Illinois Unemployment Insurance Tax is the state payroll contribution that helps finance unemployment benefits paid to eligible workers who lose employment.
It is often called Illinois UI tax, state unemployment tax, or Illinois SUTA tax. IDES generally refers to the amounts employers pay as unemployment insurance contributions.
Unlike Illinois income tax withholding, UI tax is not withheld from an employee's paycheck. Employers fund the Illinois unemployment insurance system through their own contributions.
IDES specifically states that Illinois workers do not pay unemployment insurance through payroll deductions.
An employer's cost can change from year to year because Illinois uses an experience-rating system. An employer with higher unemployment benefit charges can receive a higher contribution rate, while employers with better experience may qualify for lower rates.
Who Must Pay Illinois Unemployment Insurance Tax?
Most private, for-profit businesses become liable for Illinois unemployment insurance when they meet the state's employment or wage thresholds.
A typical for-profit employer becomes liable after paying $1,500 or more in wages during a calendar quarter, or after employing at least one person during 20 weeks in a calendar year.
Different thresholds apply to certain employers. Domestic employers generally become liable after paying at least $1,000 in cash wages in a calendar quarter.
Agricultural employers can become liable after paying $20,000 in cash wages during a quarter or employing at least 10 agricultural workers during 20 weeks in a calendar year.
A nonprofit organization generally becomes liable when it employs four or more people during each of 20 weeks in a calendar year. Local governmental organizations are generally liable when they pay wages.
These rules determine whether an employer is covered. They should not be confused with the $14,250 taxable wage limit used to calculate the actual contribution for each covered employee.
Who Is Subject to Illinois Unemployment Insurance Tax?
Illinois UI contributions generally apply to wages paid for covered employment under the Illinois Unemployment Insurance Act.
For the 2026 UI-3/40, covered wages can include salaries, commissions, bonuses, reported tips, separation pay, vacation pay, prizes, sick pay, certain retirement-related payments, and the reasonable cash value of noncash compensation such as meals or lodging.
Employers report total covered wages, including wages paid after an employee has passed the taxable wage base. They then subtract wages above the annual taxable limit when calculating taxable wages.
Not every person receiving payment from a business is automatically subject to Illinois UI tax. Certain services are excluded by law, and properly classified independent contractors may fall outside covered employment.
However, Illinois applies a specific legal test to contractor status. Simply paying someone on Form 1099 or calling the worker an independent contractor does not automatically exempt that person's services from unemployment insurance coverage.
2026 Illinois Unemployment Insurance Tax Rate
There is no single Illinois unemployment insurance tax rate for all employers in 2026.
Employers with enough unemployment insurance experience generally receive an individual rate based on their benefit history. Illinois' 2026 State Experience Factor is 102%, and the Benefit Conversion Factor is 138.4%.
The 2026 Fund Building Rate is 0.550% and is included in the final contribution rate.
| 2026 Illinois UI Rate Item | Rate or Amount |
|---|---|
| Minimum employer contribution rate | 0.750% |
| Maximum employer contribution rate | 7.050% |
| Standard entry rate for most newer employers | 3.350% |
| New employer rate for NAICS sector 56 | 3.450% |
| Fund Building Rate | 0.550% |
| State Experience Factor | 102% |
| Benefit Conversion Factor | 138.4% |
| Taxable wage base | $14,250 per employee |
The minimum and maximum rates already reflect the Fund Building Rate. Employers should therefore use the contribution rate shown on their Illinois Annual Contribution Rate Determination, rather than adding another 0.550% to an assigned final rate.
Illinois also has a special rule for certain smaller payroll quarters. An experience-rated employer whose assigned contribution rate exceeds 5.4% and whose total wages for a quarter are less than $50,000 pays at 5.4% for that quarter.
The 2026 UI-3/40 instructs an employer with quarterly total wages below $50,000 to use the lesser of its assigned rate or 5.4%.
2026 Illinois Taxable Wage Base and Wage Limit
The Illinois unemployment insurance taxable wage base for 2026 is $14,250 per employee.
Only the first $14,250 of covered wages that an employer pays to an employee during the calendar year is subject to Illinois UI contributions.
For example, if an employee earns $50,000 during 2026, the employer still reports the employee's full covered wages as required, but only the first $14,250 is used to calculate Illinois unemployment insurance contributions.
Once that employee reaches $14,250 in taxable wages for the year, additional wages paid by the same employer during 2026 generally do not create additional Illinois UI contributions for that worker.
The wage base resets at the start of each new calendar year.
Employer vs. Employee Contribution
Illinois unemployment insurance is an employer-paid payroll tax.
| Party | Illinois UI Responsibility |
|---|---|
| Employer | Pays Illinois unemployment insurance contributions |
| Employee | No Illinois UI contribution |
| Payroll deduction from employee wages | Not permitted for the employer's UI contribution |
| Tax agency | Illinois Department of Employment Security |
| 2026 wage base | $14,250 per employee |
The 2026 UI-3/40 requires employers to certify that no part of the reported unemployment insurance contribution was or will be deducted from workers' wages.
This makes Illinois UI different from payroll taxes such as Social Security and Medicare, where both employers and employees generally contribute.
How to Calculate Illinois Unemployment Insurance Tax
Employers first need their assigned Illinois UI contribution rate.
A new employer may use an entry rate, while an established employer normally receives an experience-based annual rate from IDES.
Next, payroll must track each employee's taxable Illinois UI wages throughout the year. Only wages up to $14,250 per employee for 2026 are subject to contributions.
For each quarter, the employer reports total covered wages on Form UI-3/40, subtracts wages that exceed the annual $14,250 limit, and applies its applicable contribution rate to the remaining taxable wages.
Employers should track the wage base separately for every employee. The $14,250 limit is not a company-wide payroll limit.
Illinois Unemployment Insurance Tax Calculation Formula
For an individual employee, the basic calculation is:
Current taxable UI wages = Current wages, limited to the remaining portion of the employee's $14,250 annual wage base
The employer contribution is then:
Illinois UI contribution = Taxable Illinois UI wages × Employer's assigned contribution rate
For example, if an employee already has $12,000 of Illinois taxable UI wages for the year and earns another $4,000, only $2,250 of the new wages remains subject to Illinois UI tax:
$14,250 - $12,000 = $2,250
The contribution is then calculated on $2,250 rather than the entire $4,000.
Experience-Rated Employer Formula
Illinois uses benefit charges and taxable wages to determine rates for experienced employers.
The basic rate process begins with:
Converted Benefit Charges = Benefit Charges × 138.4%
The employer's benefit ratio is generally:
Benefit Ratio = Converted Benefit Charges ÷ Applicable Taxable Wages
The benefit ratio is then multiplied by the 2026 State Experience Factor of 102%. The result is rounded as required by IDES, and the 0.550% Fund Building Rate is added.
The final rate is subject to the 2026 minimum rate of 0.750% and maximum rate of 7.050%.
The exact experience period depends on how many years the employer has been liable for Illinois unemployment contributions.
Practical Illinois UI Payroll Calculation Example
Assume a newer Illinois employer has a 3.350% contribution rate for 2026.
One employee earns $5,000 in the first quarter, another $5,000 in the second quarter, and $5,000 in the third quarter.
| Period | Wages Paid | Illinois UI Taxable Wages | UI Contribution at 3.350% |
|---|---|---|---|
| Q1 | $5,000 | $5,000 | $167.50 |
| Q2 | $5,000 | $5,000 | $167.50 |
| Q3 | $5,000 | $4,250 | $142.38 |
| 2026 Total | $15,000 | $14,250 | $477.38 |
During Q3, the employee only has $4,250 remaining before reaching the $14,250 annual taxable wage base.
The calculation is:
$14,250 × 3.350% = $477.375
Rounded to cents, the total Illinois UI contribution for this employee is approximately $477.38 for the year.
If the employee earns additional wages during Q4, those wages would still be reported where required, but no additional Illinois UI contribution would normally apply for that employee because the annual wage base has already been reached.
Illinois New Employer Unemployment Tax Rate for 2026
Most employers that became liable for Illinois unemployment insurance on or after January 1, 2024 use a 2026 entry rate of 3.350%.
Illinois applies a higher entry rate to new employers in one industry category for 2026. Employers classified under NAICS sector 56, Administrative Support and Waste Management, have a 3.450% entry rate. Both rates include the 0.550% Fund Building Rate.
There is also a transition rule for employers that became liable between January 1, 2024 and June 1, 2024 and had at least 13 months of experience as of June 30, 2025.
For these employers, IDES compares the standard 3.350% rate with an experience-based rate and applies the greater applicable rate under its 2026 calculation rules.
This is why employers should use the rate shown on their IDES Annual Contribution Rate Determination rather than assuming the standard new employer rate applies.
Illinois Employer Registration Requirements
A newly created employing unit must register with IDES within 30 days after starting business.
Employers can register online through MyTax Illinois. Businesses using the paper process can complete Form REG-UI-1, Report to Determine Liability Under the Illinois Unemployment Insurance Act.
The registration allows IDES to determine whether the business is liable for Illinois unemployment insurance and establishes the employer's Illinois UI account.
MyTax Illinois can be used to register a new business with both the Illinois Department of Revenue and IDES, reducing the need to manage separate online registration processes.
Employers should not wait until the first quarterly contribution return is due before reviewing registration. The 30-day registration rule applies when the business begins operations.
Required Illinois Unemployment Insurance Forms
| Form | Purpose |
|---|---|
| REG-UI-1 | Determines employer liability and registers a new employing unit |
| UI-3/40 | Quarterly Employer's Contribution and Wage Report |
| UI-40C | Corrects previously reported employer wage information |
| UI-40B | Corrects an employee name or Social Security number |
| UI-50 / UI-50A | Reports employer account or business status changes |
| UI-1M | Special mailing and related employer correspondence requests |
| UI-HA | Reporting form for qualifying household employers |
The main recurring payroll tax form is UI-3/40. IDES issued a revised 2026 version of this form in March 2026, and the form uses the current $14,250 wage base.
Illinois UI Tax Filing Requirements
Employers subject to the Illinois Unemployment Insurance Act generally file Form UI-3/40 every quarter.
The report includes the number of covered workers, total wages, wages above the taxable wage base, taxable wages, contribution amount, employee Social Security numbers, employee names, and wages paid to each worker.
An employer that paid no wages during a quarter but has not permanently stopped being an employer must still file a report showing No Wages Paid This Quarter.
Employers with 25 or more employees during the prior calendar year are subject to electronic reporting requirements. Their quarterly UI-3/40 must be filed electronically.
Employers below the electronic filing threshold can use the paper form, although MyTax Illinois is available to employers of any size.
Employers should not correct a prior-quarter wage error by changing the current quarter's wages. IDES provides correction procedures and forms for prior reporting periods.
Filing and Payment Frequency
Illinois unemployment insurance contributions are generally reported and paid quarterly.
The quarterly UI-3/40 covers the full three-month period, and contributions are calculated and paid with the quarterly report.
Illinois also has a separate monthly wage reporting requirement for larger employers. Employers subject to the 25-or-more employee electronic reporting requirement file wage information for the first and second months of every quarter.
That means monthly wage reports apply to January, February, April, May, July, August, October, and November.
Employers do not calculate or pay unemployment insurance contributions with those monthly reports. Contributions remain due with the quarterly UI-3/40.
Important 2026 Illinois UI Tax Due Dates
IDES sets the normal quarterly filing and contribution deadlines as the last day of the month following each quarter.
| 2026 Payroll Quarter | Reporting Period | Normal UI-3/40 Due Date |
|---|---|---|
| Q1 | January 1 to March 31 | April 30, 2026 |
| Q2 | April 1 to June 30 | July 31, 2026 |
| Q3 | July 1 to September 30 | October 31, 2026 |
| Q4 | October 1 to December 31 | January 31, 2027 |
IDES publishes April 30, July 31, October 31, and January 31 as the regular quarterly deadlines.
When an unemployment insurance payment deadline falls on a weekend or legal holiday, IDES' electronic payment guidance provides that the payment is due on the first business day following the weekend or holiday.
Monthly Wage Report Due Dates
For employers required to file monthly wage reports, reports are normally due by the last day of the following month.
For example, January wages are reported by the end of February, February wages by March 31, April wages by May 31, and May wages by June 30.
The same pattern applies to July, August, October, and November. The third month of each quarter is included in the quarterly UI-3/40 instead of a separate monthly report.
Illinois UI Tax Exemptions and Special Rules
Illinois unemployment insurance includes several state-specific rules that employers should review before deciding whether wages are taxable.
Certain nonprofit organizations and local governmental entities can elect to reimburse IDES for unemployment benefits paid rather than paying regular quarterly contributions. These employers must still file required wage reports.
Some services can be outside Illinois UI coverage. Examples include certain family employment, certain agricultural and domestic employment below the statutory thresholds, railroad employment covered by the federal Railroad Unemployment Insurance Act, and qualifying insurance agents whose services are paid solely by commission.
Illinois also has a strict independent contractor rule. Under Section 212 of the Illinois Unemployment Insurance Act, services are generally treated as employment unless the employer can establish all required conditions relating to freedom from control, work outside the employer's usual course or place of business, and an independently established business.
Another important 2026 rule applies when an employer has a high assigned contribution rate but a relatively small quarterly payroll.
When quarterly total wages are below $50,000, Form UI-3/40 instructs the employer to calculate contributions using the lower of its assigned contribution rate or 5.4%.
Illinois Remote Employee Unemployment Insurance Rules
Remote and multi-state employees require special attention because unemployment insurance coverage is generally based on where the employee's services are located, not simply where the employer's headquarters are located.
Under the Illinois Unemployment Insurance Act, an employee's services can be Illinois employment when the services are localized in Illinois.
Services are considered localized when they are performed entirely in Illinois or when work performed outside Illinois is only incidental to the employee's main Illinois work.
For example, an employee who lives in Illinois and performs all work from an Illinois home office for an employer headquartered in another state can create an Illinois unemployment insurance obligation because the employee's services are performed in Illinois.
The opposite can also apply. An Illinois company with an employee who works entirely from another state should not automatically report that worker for Illinois UI simply because the company is based in Illinois.
The employee's services may instead be localized in the state where the remote work is performed.
When services are performed in several states and are not localized in any one state, Illinois applies additional tests involving the employee's base of operations, the place from which services are directed or controlled, and, in certain cases, the employee's residence.
Employers with remote and mobile workers should therefore maintain accurate work-location records. Illinois regulations require employment records to include information about where employees perform their services.
Common Illinois UI Payroll Mistakes Employers Should Avoid
One common mistake is treating the 2026 new employer rate of 3.350% as the rate for every Illinois business. Established employers usually have an IDES-assigned experience rate, which can range from 0.750% to 7.050%.
Another common error is applying unemployment insurance tax to all annual wages rather than stopping taxable wages at $14,250 per employee. Employers should still report total covered wages correctly even when part of those wages exceeds the taxable limit.
Payroll teams can also make errors by deducting Illinois unemployment insurance contributions from employee pay. Illinois UI is an employer contribution and should not be passed through as an employee payroll deduction.
Businesses with 25 or more employees can miss the additional monthly electronic wage reports because they assume the quarterly UI-3/40 is their only reporting requirement.
Misclassifying employees as independent contractors can create a much larger problem. Illinois does not treat a Form 1099 or written contractor agreement as enough to establish independent contractor status.
The state applies its legal employment test based on the actual working relationship.
Employers should also monitor IDES benefit charge statements and their annual contribution rate notice. Unemployment claims and benefit charges can affect future experience-rated UI costs.
Penalties and Interest for Late Illinois UI Filing or Payment
Illinois can charge both a late filing penalty and interest on unpaid unemployment insurance contributions.
For 2026, Form UI-3/40 states that unpaid contributions are subject to interest at 2% per month, calculated using IDES' statutory daily formula. For the first 30 days after the due date, interest is calculated daily.
The late report penalty is based on total wages and the length of the delay. IDES states that the penalty begins at $5 for each $10,000, or fraction of $10,000, of total wages, subject to the applicable monthly limit.
The maximum calculation can reach $10 for each $10,000 or fraction of total wages, subject to IDES' stated maximum. A late filing penalty can never be less than $50.
The 2026 UI-3/40 instructions also state a $2,500 monthly limit for the initial calculation and an overall maximum of the lesser of the wage-based maximum calculation or $5,000.
Illinois can also impose consequences for failing to properly report employees or deliberately failing to pay UI contributions. IDES notes that responsible corporate officers or employees can face personal liability in certain cases involving willful failure to file required reports or make required payments.
Because interest can accumulate quickly, employers should correct missed UI contributions as soon as an error is identified.
How PayDay Can Help Manage Illinois Unemployment Insurance Tax
Illinois unemployment insurance calculations require employers to manage employee wage history, employer-specific contribution rates, annual wage limits, quarterly taxable wages, and state reporting data.
PayDay payroll software can help automate payroll calculations by tracking employee wages and applying payroll tax settings across payroll periods.
This can help payroll teams identify when an employee approaches the Illinois UI taxable wage base and reduce the manual work involved in calculating taxable wages.
PayDay can also support payroll reporting and compliance workflows by keeping employee wage data, payroll calculations, deductions, employer taxes, and reporting information organized in one payroll system.
Employers remain responsible for using the correct IDES contribution rate, maintaining accurate employee classifications, reviewing state notices, and meeting Illinois filing and payment requirements.
Payroll automation can make those responsibilities easier to manage consistently across each payroll cycle.
Frequently Asked Questions
What is the Illinois unemployment insurance tax rate for 2026?
Illinois does not have one tax rate for every employer. Experience-rated employer rates range from 0.750% to 7.050% for 2026. Most newer employers use a 3.350% entry rate, while new employers in Administrative Support and Waste Management, NAICS sector 56, use a 3.450% rate.
What is the Illinois unemployment taxable wage base for 2026?
The 2026 Illinois unemployment insurance taxable wage base is $14,250 per employee. Only the first $14,250 of covered wages paid to each employee during the calendar year is subject to Illinois UI contributions.
What is the Illinois new employer UI rate for 2026?
The standard entry rate for most newer employers is 3.350%. New employers classified in NAICS sector 56, Administrative Support and Waste Management, have a 3.450% entry rate for 2026.
Do Illinois employees pay unemployment insurance tax?
No. Illinois unemployment insurance contributions are paid by employers. Employees do not have Illinois unemployment insurance tax deducted from their wages.
How often do employers pay Illinois unemployment tax?
Illinois UI contributions are generally calculated and paid quarterly with Form UI-3/40. The normal deadlines are April 30, July 31, October 31, and January 31.
Do employers stop reporting wages after an employee reaches $14,250?
No. Employers should continue reporting the employee's total covered wages as required. The $14,250 figure limits the wages subject to unemployment insurance contributions. Form UI-3/40 separately reports total wages and wages above the taxable wage base.
Are remote workers subject to Illinois unemployment insurance?
They can be. Illinois first looks at where the employee's services are localized. An employee working entirely from Illinois can generally have Illinois-covered employment even when the employer is based elsewhere.
For multi-state employees, Illinois also considers the base of operations, where work is directed or controlled, and in certain situations the employee's residence.
Are independent contractors subject to Illinois unemployment insurance tax?
A worker who truly qualifies as an independent contractor under Illinois law may not be covered. However, Illinois starts from the position that services performed by an individual are employment unless the employer can establish the requirements in Section 212 of the Illinois Unemployment Insurance Act. Calling a worker a contractor or issuing Form 1099 does not by itself decide UI coverage.
