Payroll in Illinois: prices, state taxes and deadlines, town by town
What businesses in Illinois pay for payroll, what the state's unemployment tax and minimum wage add, when a final paycheck is legally due, and what the IRS charges for a late deposit - verified sources, per-town guides.
Two free marketplace paths: one form brings back multiple vetted payroll providers who know they are competing for the account.
Payroll services quoted across Illinois in 2026 run $20-$150 a month in base fees plus $4-$15 per employee per month, putting a ten-person payroll at roughly $70-$250 a month all in.
Illinois assigns new employers a state unemployment tax rate of 3.35% on wages up to $14,250 per employee per year - the state-set portion of every payroll run in the state, before a single provider fee is counted.
Illinois requires a terminated employee's final paycheck In full at the time of separation if possible, but in no case later than the next regularly - a deadline set by state law rather than by your pay cycle, and the most common way a small payroll turns into a wage claim.
Every payroll provider sells the same three promises - run the checks, file the taxes, keep you compliant - and prices them differently enough that identical Illinois businesses pay double what their neighbors pay. The comparison that matters is not the base fee: it is the all-in monthly total at your headcount, the per-state filing surcharge if anyone works remotely, and what the contract says happens at renewal.
Get competing payroll quotes - one form, several providers
Two free marketplace paths: one form brings back multiple vetted payroll providers who know they are competing for the account. Competing quotes are the only reliable way to see what your headcount actually prices at.
External links go to the marketplaces' own sites and forms. This site may earn a referral fee at no cost to you - it never changes the data above, and no individual payroll provider pays to appear in our research.
What Illinois adds to every payroll
| Question | Illinois answer |
|---|---|
| State unemployment tax - new employer rate | 3.35% (range 0.75% - 7.05%) |
| Taxable wage base per employee | $14,250 - PARTIALLY primary-confirmed |
| State minimum wage | $15.00 - Tipped employees may be paid 60% of the minimum wage ($9.00) provided tips bring them to $15.00 |
| State income tax withholding | flat 4.95% |
| Final paycheck - employee is fired | In full at the time of separation if possible, but in no case later than the next regularly scheduled payday for that employee |
| Final paycheck - employee quits | Same — in full at the time of separation if possible, and in no case later than the next regularly scheduled payday |
| Penalty for a late final paycheck | The employee may recover, through an Illinois Department of Labor claim or a civil action but not both, the underpayment plus damages of 5% of the underpayment for each month it remains unpaid |
| Unused vacation / PTO payout | must_pay |
| New-hire reporting deadline | Within 20 days of hire date |
| Penalty for late new-hire reporting | No monetary penalty specified |
Illinois recomputes a statewide 'State Experience Factor' every year (102% for 2026) that scales every employer's rate, and it charges staffing/waste-management employers (NAICS sector 56) a higher new-employer rate of 3.45% instead of the standard 3.35%.
This page is independent research, not legal, tax or accounting advice. Federal deposit rules and state wage, unemployment and final-paycheck laws change - verify current requirements with the IRS and your state labor and revenue agencies, or with a licensed CPA or attorney, before acting.
What payroll services cost in 2026
| What you are buying | 2026 published range | The number that actually matters |
|---|---|---|
| Monthly base fee | $20-$150/month | Meaningless alone - always price it with your headcount attached |
| Per employee, per month | $4-$15/employee/month | At 10 employees this is most of the bill: $70-$250/month all in |
| Fully outsourced processing | $30-$100/person/month | Quoted per person rather than base plus fee - bundles compliance work |
| Year-end W-2 and 1099 filing | $4-$8/form | Included at some tiers, billed at others - ask before January |
| Additional state filings (remote staff) | $6-$20/state/month | One remote hire in a new state can change the plan you need |
| Off-cycle or bonus runs | $5-$50 each | Bonus season is when this line shows up on the invoice |
| Setup / implementation | $0-$200 | Commonly waived at small-business tiers - ask, it is negotiable |
| A late federal deposit | 2%-15% of the deposit | The reason the monthly fee is the second-most important number (IRS IRC 6656) |
The penalty schedule, in the IRS's own numbers
| What happened | Federal penalty | Applied to |
|---|---|---|
| Deposit up to 5 days late | 2% | The deposit amount |
| Deposit 5-15 days late | 5% | The deposit amount |
| Deposit more than 15 days late | 10% | The deposit amount |
| Still unpaid 10 days after an IRS notice | 15% | The deposit amount |
| Form 941 filed late | about 5% per month, capped near 25% | The unpaid tax |
| Withheld trust-fund taxes never paid over | Trust Fund Recovery Penalty - 100% of the trust-fund amount | A responsible person, personally |
Read that last row twice. Income tax and the employee share of FICA are withheld in trust, which is why the penalty for never paying them over can be assessed personally against an owner or officer of an Illinois business under IRC 6672 - the corporation does not stand in the way. It is the strongest argument for hiring a provider, and the strongest argument for verifying that the provider actually files.
One detail in the IRS's favour: the percentages do not stack. A deposit more than 15 calendar days late is charged at 10%, not at 10% plus the earlier 2% and 5% tiers. That is the only piece of good news on this page.
The sentence that decides the whole question
The IRS puts it in two sentences on its outsourcing page: "The employer is ultimately responsible for the deposit and payment of federal tax liabilities," and if the third party fails to make those payments, "the employer is liable for all taxes, penalties and interest due." In other words, an employer who outsources payroll duties remains responsible for depositing and reporting employment taxes. Every payroll provider is selling reliability against that fact, and none of them can sell an exemption from it. The practical consequences for an Illinois employer are concrete: keep the IRS address of record as your own so notices reach you, ask for filing confirmations rather than assuming, and treat a provider's penalty guarantee as a contract term to read - not as a transfer of the legal duty.
Why only these two paths
A late deposit costs 2% to 15% of the deposit; a full year of payroll processing for a small Illinois employer costs less than one such penalty on a modest payroll. Price the service second and the failure mode first.
Hard bar, verifiable by anyone: free to the buyer, and structurally multi-vendor - one request produces several competing quotes, which is the check against over-quoting that no single sales relationship provides. Marketplaces that charge buyers or route to a single seller are not listed, and any listed path that drops below the bar gets removed. We list no individual payroll brand as a recommendation: this site does not rank providers it cannot audit filings for.
| Path | What it is | Why it made the bar |
|---|---|---|
| BuyerZone | B2B quote marketplace covering payroll services and other business categories | One form, multiple vetted providers respond with competing quotes - free to buyers |
| 360Connect | B2B quote marketplace with local service-area matching for payroll solutions | Matches up to five suppliers per request, 100% free to buyers |
Get competing payroll quotes - one form, several providers
Two free marketplace paths: one form brings back multiple vetted payroll providers who know they are competing for the account. Competing quotes are the only reliable way to see what your headcount actually prices at.
External links go to the marketplaces' own sites and forms. This site may earn a referral fee at no cost to you - it never changes the data above, and no individual payroll provider pays to appear in our research.
Common questions
What is state unemployment tax and why does my rate change?
Every employer pays state unemployment insurance tax on each employee's wages up to a state taxable wage base. New employers are assigned a starting rate; after enough history, the rate moves within a statutory band based on claims experience. Two identical payrolls can owe very different amounts because both the rate and the wage base are set state by state - the Illinois figures are published on this site's state page.
What is the penalty for depositing payroll taxes late?
The federal failure-to-deposit penalty runs 2% for deposits up to 5 days late, 5% for 5-15 days, 10% beyond 15 days, and 15% if the tax remains unpaid more than ten days after the IRS issues a notice. Filing Form 941 late adds a separate penalty of about 5% of the unpaid tax per month, capped near 25%.
If my payroll provider files late, who pays the IRS penalty?
The employer is responsible to the IRS regardless. The IRS states that outsourcing payroll duties does not relieve an employer of the responsibility to deposit and report employment taxes - the notice follows your EIN. Many providers offer a contractual guarantee to cover penalties they cause, but that is a private contract, not a change in tax liability. Get the guarantee, its limits and its claim process in writing.
Can I do payroll myself instead?
Yes, and for a single-state business with a handful of salaried employees, software plus discipline is genuinely cheaper. The variables that change the answer are multi-state employees, hourly overtime, tipped wages, garnishments and turnover - each multiplies the number of deadlines. For scale, an in-house payroll specialist averages about $64,865 dollars a year in 2026 wage data, so the real comparison for most small employers is software plus your own hours versus a service.
What hidden fees do payroll companies charge?
The recurring surprises are year-end W-2 and 1099 filing at roughly 4-8 dollars per form, additional state tax filings at 6-20 dollars per state per month for remote employees, off-cycle or bonus runs at 5-50 dollars each, setup or implementation fees, charges for mailed paper checks, and per-employee fees that continue for terminated staff. Ask for the full fee schedule in writing, not the pricing page.
What is the Trust Fund Recovery Penalty?
Withheld income tax and the employee share of Social Security and Medicare are held in trust for the government. When those amounts are not paid over, the IRS can assess a penalty equal to the full unpaid trust-fund amount personally against any responsible person who willfully failed to pay - an owner, officer or bookkeeper. It is one of the few business tax liabilities that reaches through a corporation or LLC to an individual.
Get competing payroll quotes - one form, several providers
Two free marketplace paths: one form brings back multiple vetted payroll providers who know they are competing for the account. Competing quotes are the only reliable way to see what your headcount actually prices at.
External links go to the marketplaces' own sites and forms. This site may earn a referral fee at no cost to you - it never changes the data above, and no individual payroll provider pays to appear in our research.
Prices by city
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