Illinois offers three main online channels to pay state income tax, each with different timing and account requirements
The Illinois Department of Revenue runs two direct payment systems: the Illinois Tax Payment System (ITPS) for individual and business filers, and IDOR Pay, a newer portal launched to consolidate payments across multiple tax types. You can also pay through your bank's bill pay feature if your bank routes payments to Illinois. The method you choose affects when the state receives your money and whether you need to set up a separate account.
ITPS has been the standard for years and works through the state's website. IDOR Pay is designed to be simpler and handles income tax, sales tax, withholding tax, and other state obligations in one place. Both are free to use. Your bank's bill pay is free too, but it requires you to know the correct mailing address and account number to include with your payment, and processing takes longer than direct state systems.
Key Takeaways
- ITPS and IDOR Pay are both free, state-run portals; ITPS is older and more widely used, while IDOR Pay is newer and consolidates multiple tax types.
- Payments made through ITPS or IDOR Pay are received by the state within one business day if submitted before the payment important date; bank bill pay takes five to seven business days.
- You do not need a pre-existing account to pay through ITPS, but IDOR Pay requires you to create one first.
- The state considers a payment on time if it is received by midnight Central Time on the due date, not when you submit it.
Using the Illinois Tax Payment System (ITPS)
ITPS is accessed through the Illinois Department of Revenue website at tax.illinois.gov. Look for the "Pay Now" or "Make a Payment" link on the homepage. You will need your Social Security Number or Federal Employer Identification Number, the tax year you are paying for, and the amount owed. ITPS accepts payment by electronic check (ACH debit from your bank account) or credit/debit card.
If you pay by electronic check, there is no fee and the money reaches the state within one business day. If you use a credit or debit card, the state charges a convenience fee — currently around 2.5% of the payment amount, though this varies. That fee goes to the payment processor, not to Illinois. Electronic check is the cheaper option if you have a few days before the important date.
You do not need to create an account or log in to use ITPS. Each payment is a one-time transaction. The system will give you a confirmation number when ready after you submit; save this for your records. If you are paying a balance owed from a prior year, you can pay multiple tax years in one session, but you must enter each separately.
Using IDOR Pay for consolidated state tax payments
IDOR Pay is the newer system and is meant to replace ITPS over time, though both currently operate. You access it at pay.illinois.gov. Unlike ITPS, IDOR Pay requires you to create an account with an email address and password before you can make a payment. This takes a few minutes the first time.
Once logged in, IDOR Pay shows all your state tax obligations in one dashboard — income tax, sales tax, withholding tax, and other liabilities. You can pay one or multiple at once. Like ITPS, it accepts electronic check (no fee, one business day) or card (with a convenience fee). The state receives payments within one business day if submitted before the important date.
IDOR Pay is useful if you file multiple types of state taxes or if you want a record of all your payments in one place. However, because it requires an account, it takes slightly longer to set up the first time. If you are paying once and do not plan to pay again soon, ITPS may be faster.
Paying through your bank's bill pay service
Most banks offer bill pay as part of checking or business accounts, usually at no extra cost. You can use it to send a check to the Illinois Department of Revenue. To do this, you need the correct mailing address and your account number or tax identification number.
The Illinois Department of Revenue's mailing address for payments is: Illinois Department of Revenue, P.O. Box 19044, Springfield, IL 62794-9044. Include your name, address, Social Security Number or FEIN, the tax year, and the amount on the check or in the memo line. Your bank will print and mail the check on your behalf, and you can track it through your bank's system.
Bank bill pay is slower than ITPS or IDOR Pay. Your bank typically processes the payment within one to two business days, then mails a physical check, which takes another three to five business days to arrive. The state does not consider the payment received until it arrives at the mailbox. If your important date is fewer than seven business days away, do not use bank bill pay — use ITPS or IDOR Pay instead.
Timing and when the state considers your payment received
The state's rule is clear: a payment is on time if it is received by midnight Central Time on the due date. This is not when you click submit or when your bank processes it — it is when the Illinois Department of Revenue's system records it.
Payments submitted through ITPS or IDOR Pay before the important date are received within one business day, so submitting by the day before the important date is safe. If you submit on the due date itself, you are taking a small risk; if the system is slow or there is a processing delay, the payment might not post until the next day, making it late. The state does not grant extensions for processing delays on online payments.
Payments by bank bill pay are considered received when they arrive at the state's mailbox, not when your bank sends them. The Postal Service does not may provide delivery dates, so a check mailed on the due date will almost certainly arrive late. Mail your payment at least one week before the important date if you use this method.
What to do if you miss the important date or owe penalties
If you submit a payment after the due date, the state will assess a failure-to-pay penalty (currently 0.5% per month of the unpaid tax) and interest (currently 5% per year, compounded daily). These accrue from the original due date, not from when you eventually pay.
You cannot remove these penalties through the online payment system. If you believe the penalty was assessed in error — for example, if you paid on time but the state's records show otherwise — you must contact the Illinois Department of Revenue directly at 1-800-732-8866 or file a protest with the department. Keep your payment confirmation number from ITPS or IDOR Pay as proof of when you submitted the payment.
If you cannot pay the full amount by the important date, you can still submit a partial payment online to reduce the penalty. The state will assess the penalty on the remaining balance, but paying something before the important date is better than paying nothing. You can also contact the department about a payment plan if you owe a large amount.
Comparing the three payment methods
| Method | Account Required | Fee | Time to Receive | Best For |
|---|---|---|---|---|
| ITPS | No | None (ACH); ~2.5% (card) | 1 business day | One-time payments, no account setup |
| IDOR Pay | Yes | None (ACH); ~2.5% (card) | 1 business day | Multiple tax types, ongoing filers |
| Bank Bill Pay | Varies by bank | None | 5–7 business days | Payments with time to spare |
ITPS and IDOR Pay are nearly identical in cost and speed. The main difference is convenience: ITPS is faster to use once, while IDOR Pay is better if you pay multiple taxes or want a dashboard. Bank bill pay is free but slow and should only be used if your important date is more than a week away.
Choose ITPS if you are paying once and want no account setup. Choose IDOR Pay if you file multiple state taxes or plan to pay again in the future. Choose bank bill pay only if you have more than seven days before your important date and prefer to avoid entering bank details online.
Frequently Asked Questions
Can I pay Illinois state taxes through a third-party tax software?
Some tax software (like TurboTax or H&R Block) offers to file and pay for you, but they route the payment through ITPS or a similar processor and charge their own fee on top of the state's card fee. It is cheaper to pay directly through ITPS or IDOR Pay yourself. Use tax software only if you need help preparing the return, not for payment.
What if I pay too much by mistake?
If you overpay, the state will either refund the excess or credit it toward next year's tax. You can request a refund by contacting the Illinois Department of Revenue or filing an amended return. Refunds typically take four to six weeks. Do not assume the overpayment will automatically roll forward.
Can I schedule a payment for a future date through ITPS or IDOR Pay?
No. Both systems process payments when ready when you submit them. If you want to pay on a specific future date, use your bank's bill pay feature and schedule it there, but remember that bill pay takes five to seven days to reach the state, so schedule it well before your important date.
Is it safe to enter my bank account information on ITPS or IDOR Pay?
Yes. Both are state-run systems using encryption and security standards required for government payment processing. They do not store your full bank account number after the transaction completes. Do not use public Wi-Fi when entering sensitive information, and verify you are on the official state website (tax.illinois.gov or pay.illinois.gov) before entering any details.
What if my payment shows as submitted but I do not see it reflected in my account?
Payments typically post within one business day. If more than two business days have passed and the payment still does not appear, contact the Illinois Department of Revenue at 1-800-732-8866 with your confirmation number. Do not submit the payment again; a duplicate payment is harder to reverse than a missing one.