How to Pay the Illinois Department of Revenue
What the Illinois Department of Revenue collects and how payments work
The Illinois Department of Revenue collects state income tax, sales tax, and other state taxes. If you owe money to them—whether from a tax bill, an audit, or a penalty—you can pay online, by mail, or through an authorized payment processor. The state does not require you to use a specific method, but each route has different timing and fees.
Payments go into the state's general fund and are recorded against your tax account within one to three business days for online payments, longer for checks. The Department of Revenue does not accept cash or in-person payments at their offices. Understanding which payment method fits your situation—and what happens if you pay late—helps you avoid additional penalties and keep your account in good standing.
Key Takeaways
- You can pay the Illinois Department of Revenue online through their official website, by mail with a check, or through an authorized third-party processor, each with different processing times and fees.
- Online payments through the state website are free and process within one to three business days; third-party processors charge a fee but may offer faster confirmation.
- If you cannot pay in full, you can request a payment plan directly from the Department of Revenue, which may reduce penalties and interest from accruing further.
- Late payments accrue interest at the rate set by state law and may trigger additional penalties; paying even a partial amount stops some of the interest from growing.
- You will need your Social Security number or federal employer identification number, your tax year, and the amount owed before you start any payment.
Paying online through the Illinois Department of Revenue website
The official state website offers free online payment through their tax payment portal. Go to tax.illinois.gov, select "Make a Payment," and choose the tax type you owe (income tax, sales tax, or other). You will enter your Social Security number or FEIN, the tax year, and the amount. The system accepts payments from a bank account via ACH transfer or from a debit card.
ACH payments are free and typically post to your account within one to three business days. Debit card payments also carry no fee through the state portal, though your bank may charge you a separate fee for using a debit card as a payment method—check with your bank first. Credit cards are not accepted through the state website. After you submit, you receive a confirmation number immediately; save it for your records.
Paying by mail with a check
You can mail a check to the Illinois Department of Revenue. Write your Social Security number or FEIN on the check itself, and include a note with the tax year and type of tax you are paying. Mail it to the address listed on your tax bill or notice; different tax types have different mailing addresses, so check your bill before sending.
Mail processing takes one to two weeks for the check to arrive, plus several days for the state to record it. If your payment deadline is approaching, mailing is the slowest option. Keep a copy of your check or a photo of the front and back for your records. If the check is lost or delayed, you will still owe interest on the unpaid balance until the state receives and records it.
Using a third-party payment processor
The Illinois Department of Revenue authorizes certain payment processors to accept tax payments on their behalf. These companies charge a convenience fee—typically 1.5% to 2.5% of the payment amount—but offer faster confirmation and sometimes same-day or next-day posting. You can find the list of authorized processors on the state website under "Payment Options."
Third-party processors accept credit cards, debit cards, and bank transfers. If you need to pay quickly or want to use a credit card to earn rewards, a processor may be worth the fee. However, the fee is your responsibility; it does not reduce the amount owed to the state. Always verify that the processor is listed on the official state website before entering payment information, as scams exist that impersonate state payment services.
Setting up a payment plan if you cannot pay in full
If you owe money but cannot pay it all at once, contact the Illinois Department of Revenue directly to request a payment plan. Call their taxpayer assistance line or submit a request through their website. The state will review your situation and may offer a plan that lets you pay over several months. A payment plan does not erase what you owe, but it can stop additional penalties from accruing and gives you time to spread the cost.
Payment plans require you to make regular payments on schedule. If you miss a payment, the plan may be cancelled and the full balance becomes due immediately. The state may also place a lien on your property or garnish your wages if you fall behind. Setting up a plan early—before the bill becomes severely overdue—gives you more negotiating room and often results in better terms.
Understanding interest and penalties on late payments
If you do not pay by the deadline shown on your bill, the Illinois Department of Revenue charges interest on the unpaid balance. The interest rate is set by state law and changes quarterly; it is currently in the range of 6% to 8% per year, but check your bill or the state website for the exact rate that applies to your tax year. Interest accrues daily and compounds, meaning you owe interest on the interest.
Late payment penalties are separate from interest. A penalty of 5% of the unpaid tax is common for payments that are 30 days late; it increases to 10% if the payment is more than 60 days late. These penalties are added to your bill and also accrue interest. Paying even a partial amount stops interest from growing on that portion, so if you can pay part of what you owe, do so as soon as possible.
What to do if you receive a notice or bill from the Department of Revenue
A notice from the Illinois Department of Revenue means the state has assessed a tax, found an error on your return, or determined you owe a penalty. Read the notice carefully to understand what tax year it covers, what amount is owed, and what the deadline is. The notice will also explain your right to dispute the assessment or request a hearing if you disagree.
If you believe the notice is wrong, you have a limited time to file a protest or request a hearing—usually 60 days from the date of the notice. Contact the Department of Revenue to ask about your options before you pay. If you do not dispute it and the deadline passes, you must pay the amount owed. Paying does not waive your right to dispute later, but it stops interest and penalties from growing while you pursue your case.
Frequently Asked Questions
Can I pay my Illinois state income tax bill online with a credit card?
No, the official state website does not accept credit cards. You can use a debit card, bank transfer, or check. If you want to pay with a credit card, you can use an authorized third-party processor, but they will charge a convenience fee of 1.5% to 2.5% of the amount you pay.
How long does it take for the state to record my payment?
Online payments through the state website typically post within one to three business days. Checks take one to two weeks to arrive plus several days to record. Third-party processors vary; check their terms when you pay. Interest continues to accrue until the state actually records your payment, not when you send it.
What happens if I pay late?
Late payments accrue interest at a rate set by state law (currently 6% to 8% per year) plus penalties starting at 5% of the unpaid tax if you are 30 days late. Interest compounds daily. Paying even a partial amount stops interest from growing on that portion. If you are significantly overdue, the state may place a lien on your property or garnish your wages.
Can I set up a payment plan for my tax bill?
Yes. Contact the Illinois Department of Revenue through their website or taxpayer assistance line to request a payment plan. The state will review your situation and may allow you to pay over several months. Missing a payment can cancel the plan and make the full balance due immediately.
What if I disagree with the amount the state says I owe?
You have the right to dispute the assessment, usually within 60 days of receiving the notice. Contact the Department of Revenue to ask about filing a protest or requesting a hearing. Paying the bill does not waive your right to dispute it later, and it stops interest from growing while you pursue your case.