How to Pay Illinois Taxes Online: MyTax, Deadlines, and Penalties

To pay Illinois taxes online, use MyTax Illinois, the Department of Revenue’s free portal at mytax.illinois.gov. You can send an individual income tax payment, estimated payment, or extension payment directly from a checking or savings account without creating an account, and the state charges nothing for that direct transfer. If you’d rather pay by credit or debit card, Illinois authorizes three third-party processors, each of which charges its own convenience fee.

What to Have Ready Before You Start

Individual filers need a Social Security Number. Businesses use their Federal Employer Identification Number.¹ You also need to know which form the payment applies to. For most people that’s the IL-1040 (individual income tax); corporations use the IL-1120.²

If you’re responding to a notice or bill, keep the Letter ID or account number from that correspondence nearby. For a routine estimated or return payment with no letter, you can still pay as a guest using the non-login option on the MyTax Illinois homepage.³

For a direct bank payment, have your bank’s nine-digit routing number and your account number ready. Both appear on paper checks and inside your bank’s online portal. Paying by card skips the bank details but adds a processing fee.

Paying Through MyTax Illinois

MyTax Illinois handles direct transfers from checking or savings accounts at no charge.¹ You don’t need an account. On the homepage, look under the Individuals panel for the link labeled “Make an IL-1040, IL-1040-ES, or IL-505-I payment.”³

Select the payment type: return payment, estimated payment, or extension payment.
Enter your Social Security Number (or ITIN), your name, and the tax year the payment applies to.
Enter the bank routing number and account number, and mark whether the account is checking or savings.
Enter the dollar amount. You can schedule the payment for a future date or submit it right away.
Review the summary, then authorize the withdrawal.

The system returns a confirmation code. Save it. That code plus the email address you provided lets you look up the payment later through the “Retrieve a return, application, or payment” option on the homepage.³

If you file business returns regularly or want to track Department of Revenue notices, opening a full MyTax Illinois account gives you a payment history and access to correspondence. For a one-time individual payment, the guest option is enough.

Paying by Credit or Debit Card

Illinois authorizes three third-party card processors. Each charges its own convenience fee, which is not refundable, and the state receives none of it.

ACI Payments, Inc.: 2.25% of the payment amount, $2.50 minimum, credit or debit.
payILtax (Catalis): debit cards, a flat $3.75 or 1% if the payment is $400 or more; credit cards, 2.25% with a $3.75 minimum.
Link2Gov (FIS): 2.35% to 2.49% of the payment amount, $2.79 minimum, credit or debit.

On a $5,000 tax bill, even the lowest credit card rate adds about $112 in fees.⁴ If you can pay from a bank account, the ACH route through MyTax Illinois is free. The card option makes sense mainly when you need to pay immediately without the checking balance to cover it, or when rewards clearly outweigh the fee.

Key Deadline for 2026

The deadline to file and pay your 2025 Illinois individual income tax return is April 15, 2026.⁵ An extension gives you more time to file the return; it does not give you more time to pay. If you expect to owe and can’t file by April 15, send a payment by that date to avoid penalties.⁶

Extension payments go through the same MyTax Illinois guest flow. Choose IL-505-I as the payment type, enter your estimated amount, and authorize the withdrawal before midnight on April 15.

Estimated Quarterly Payments

If you expect to owe more than $1,000 in Illinois income tax for 2026 after withholding and credits, you’re required to make quarterly estimated payments.⁷ This mostly affects self-employed taxpayers, freelancers, landlords, and anyone with meaningful income not covered by employer withholding.

The 2026 due dates are:

First quarter: April 15, 2026
Second quarter: June 15, 2026
Third quarter: September 15, 2026
Fourth quarter: January 15, 2027

You can pay the full estimated amount on April 15 or split it into four equal installments.⁷ Each installment is submitted through MyTax Illinois using the IL-1040-ES payment type. Missing a quarterly deadline triggers an underpayment penalty calculated at the state’s underpayment interest rate, currently 7%.⁸

Late Payment Penalties and Interest

Illinois applies a tiered penalty for tax that was due but not paid on time:

1 to 30 days late: 2% of the unpaid amount.
31 or more days late: 10% of the unpaid amount.
After an audit begins: 15% on any amount still unpaid.
After an audit concludes: 20% on any amount not paid within 30 days of the final determination.

Those percentages stack quickly.⁹ On top of the penalty, the Department of Revenue charges interest at the underpayment rate, 7% annually through at least June 30, 2026. The rate is adjusted twice a year based on the federal underpayment rate.⁸

If your electronic payment bounces for insufficient funds, the state adds a flat $25 penalty per dishonored transaction on top of any late-payment penalty.⁹ Check your balance before you authorize.

If You Can’t Pay in Full

The Department of Revenue offers installment agreements through MyTax Illinois. You must have filed every required return through the current date to qualify, and all outstanding balances get rolled into a single plan.¹⁰

The fastest path is the pre-approved plan MyTax Illinois presents to you; accepting the terms produces immediate approval. You can also request customized terms, but that route goes to the Department’s collections staff and takes longer. If your total balance including penalties and interest exceeds $15,000, you’ll need to submit a financial disclosure form, EG-13-I for individuals or EG-13-B for businesses, with the request.¹⁰ Interest keeps accruing on the unpaid balance during the plan, so paying as much as you can upfront saves money.

Checking, Canceling, or Correcting a Payment

Once you’ve submitted a payment, you can check its status on the MyTax Illinois homepage without logging in. Use the “Retrieve a return, application, or payment” link and enter your confirmation code and email address.³ Payments show as “Pending” at first and switch to “Completed” once processed.¹

You can cancel a payment only while it’s still “Pending.” Go to the Submissions section and select “Cancel Payment.” There’s no way to edit a submitted payment. If the amount or date is wrong, cancel the pending payment and submit a new one.¹¹ Once the status changes, cancellation is off the table and you’ll need to contact the Department of Revenue directly. Lost confirmation codes can be recovered through the “Retrieve a Confirmation Code” lookup on the homepage.³

When Electronic Payment Is Required

Most individual taxpayers can choose between electronic and paper. Illinois requires electronic payment once annual liability reaches these thresholds:

Individual income tax: $200,000 or more in annual liability.
Business income tax and sales tax: $20,000 or more in annual liability.
Withholding tax: $12,000 or more in annual liability.

Several tax types require electronic payment regardless of amount, including cigarette tax stamps, motor fuel tax, and cannabis-related taxes.¹² Below those thresholds, paying online is still faster and more reliable, but it isn’t mandatory.

1
Illinois Department of Revenue. What Is MyTax Illinois and How Do I Access It
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Illinois Department of Revenue. First Time Filers
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Illinois Department of Revenue. Individual Income Tax Non-Login Functions
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Illinois Department of Revenue. Pay by Credit Card
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Illinois.gov. Illinois Department of Revenue Announces Jan 26 Start to 2026 Income Tax Season
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Illinois Department of Revenue. IL-505-I Automatic Extension Payment
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Illinois Department of Revenue. IL-1040-ES Estimated Income Tax Payments for Individuals 2026
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Illinois Department of Revenue. Interest Rates
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Illinois Department of Revenue. Pub-103 Penalties and Interest for Illinois Taxes
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Illinois Department of Revenue. Payment Plan
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Illinois Department of Revenue. How Do I Cancel or Withdraw a Request
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Illinois Department of Revenue. Who Must Make Electronic Payments