Illinois offers three main online payment methods for state income tax
You can pay Illinois state income tax through the Illinois Department of Revenue website, by phone, or through your bank's bill pay system. The department's website accepts payments directly through their payment portal, which processes both individual and business taxes. Phone payments go through a third-party processor and charge a fee. Bank bill pay lets you schedule payments from your checking or savings account without an extra charge, though you need to initiate it yourself and allow processing time.
Each method has different processing speeds, fee structures, and confirmation procedures. Knowing which one fits your situation — whether you need to pay when ready, want to avoid fees, or prefer scheduling ahead — determines which route makes sense for you.
Key Takeaways
- The Illinois Department of Revenue website accepts direct payments through their online portal and charges a convenience fee that varies by payment amount.
- Phone payments through the department's third-party processor charge a separate fee and require you to provide payment information over the phone.
- Bank bill pay has no extra fee but requires you to set it up through your own bank and typically takes three to five business days to process.
- Same-day or next-business-day processing is available through the department's website and phone line, while bank bill pay requires advance planning.
- You will need your Illinois tax ID number or Social Security number, the tax year, and the amount you owe before you start any payment method.
Paying through the Illinois Department of Revenue website
The Illinois Department of Revenue operates an online payment portal at tax.illinois.gov. You log in with your Illinois tax account credentials or create an account if you do not have one. The portal accepts payments by debit card, credit card, or electronic bank transfer (ACH). Each payment method charges a different convenience fee — credit and debit card fees are higher than ACH fees, and the exact amount depends on your payment size.
Payments submitted before 8 p.m. Central Time on a business day typically process the same day. Payments submitted after 8 p.m. or on weekends and holidays process the next business day. You receive a confirmation number when ready after payment, and the department sends an email receipt within a few hours. Keep both the confirmation number and the receipt for your records.
The portal works for individual income tax (Form IL-1040), business taxes, and extension payments. You can pay for multiple tax years in one session if you owe on more than one year.
Paying by phone through the department's processor
You can call the Illinois Department of Revenue's payment line to pay by phone. The call routes to a third-party payment processor, not the department directly. You provide your payment information — debit card, credit card, or bank account details — over the phone, and the processor charges a fee on top of your tax payment. The fee structure is similar to the website's credit card fees.
Phone payments process the same day if you call before 8 p.m. Central Time on a business day. You receive a confirmation number at the end of the call. Write down this number and the exact time and date of your call. The processor sends a confirmation email, though it may take several hours to arrive.
Phone payment is useful if you have trouble accessing the website or prefer speaking to someone, though you will not reach a tax specialist — only a payment processor who can take your information and answer basic questions about the payment process itself.
Paying through your bank's bill pay system
Most banks and credit unions offer bill pay services that let you schedule payments to the Illinois Department of Revenue from your checking or savings account. You set this up through your bank's online banking portal or by calling your bank. You will need the department's mailing address and your Illinois tax ID number or Social Security number. Your bank generates a check or electronic transfer on the date you specify.
Bank bill pay typically takes three to five business days from the date you schedule it until the department receives the payment. This means you should schedule it at least a week before your tax important date if you want to pay on time. The department considers a payment on time if it is received by the important date, not if you schedule it by the important date.
Bank bill pay has no convenience fee — you pay only the tax amount itself. This makes it the lowest-cost option if you can plan ahead. Some banks charge a small fee for bill pay services, but most do not for government payments.
What information you need before you pay
Gather these details before you start any payment method: your Illinois tax ID number (for businesses) or Social Security number (for individuals), the tax year you are paying for, and the exact amount you owe. If you are paying an extension or estimated tax, have the form number or payment type code ready.
If you are unsure of the amount you owe, check your tax notice from the department or your filed return. Paying more than you owe results in a credit that the department applies to future taxes or refunds to you, depending on your situation. Paying less than you owe leaves a balance that accrues interest and penalties.
Processing times and confirmation for each method
| Payment Method | Processing Time | Convenience Fee | Confirmation |
|---|---|---|---|
| Department website (credit/debit card) | Same day or next business day | Yes, varies by amount | when ready confirmation number, email receipt within hours |
| Department website (ACH) | Same day or next business day | Yes, lower than card | when ready confirmation number, email receipt within hours |
| Phone payment | Same day or next business day | Yes, similar to credit card | Confirmation number at end of call, email receipt within hours |
| Bank bill pay | 3 to 5 business days | No | Bank provides confirmation; department sends receipt after posting |
Frequently Asked Questions
What if I miss the tax important date but want to pay online?
You can still pay online after the important date. The department will assess interest and penalties on the unpaid balance from the important date date forward, but paying online does not prevent you from paying late. The payment methods remain the same whether you pay on time or after the important date.
Can I pay someone else's Illinois state taxes online?
You can pay if you have the taxpayer's Illinois tax ID number or Social Security number and the amount owed. The payment portal and phone line do not require you to prove you are the taxpayer — they only require the identifying information. However, the payment will be credited to that person's account, not yours.
Do I need to mail a check if I pay online?
No. Once your online payment processes and you receive a confirmation number, do not mail a check. Mailing a check after paying online can result in a duplicate payment or a credit balance on your account that takes time to resolve.
What happens if my online payment fails?
If your payment is declined, the portal or phone line will tell you when ready. No charge occurs if the payment fails. You can try again with different payment information or switch to a different payment method. If you are unsure why the payment failed, contact your bank or card issuer before trying again.
Can I set up automatic payments for Illinois state taxes?
The Illinois Department of Revenue does not offer automatic recurring payments through their website or phone line. You must initiate each payment separately. Bank bill pay can be set to repeat on a schedule if you set it up that way through your bank, but you control the frequency and amounts.