Reminder: Due to a new law, Illinois S-Corp and Partnership owners should generally pay quarterly IL state (not federal) taxes through the business. The post below is about how to pay IL taxes personally; click here for how to make IL business tax payments.

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There are multiple options for paying personal quarterly estimated taxes. You can: have your tax preparer create vouchers that you then print and mail with a check; prepare your own vouchers for the IRS and IL DoR; or pay online.

Since March 2020, agencies have had so many challenges with paper-mailed checks and vouchers that we are encouraging everyone to make all tax payments online.

The due dates for estimated quarterly taxes are approximately:
1Q: April 15
2Q: June 15
3Q: September 15
4Q: January 15 — however for state taxes, especially for cash-basis filers and those in states with PTE tax, we recommend making the final payment by December 31st.

If you want to know how to make IRS estimated tax payments, see my recent blog post with step-by-step instructions.

For the Illinois Department of Revenue (IDOR), go to the MyTax Illinois site. If you already have an account for sales taxes or another reason — do not log in, unless you are making business tax payments. Then click the “> Make an IL-1040, IL-1040-ES, or IL-505-I payment” link (see screenshot above).

Next, follow the instructions for making a quarterly estimated tax payment; it will make you enter your personal information (SSN, etc.) and ask you what kind of tax payment you wish to make.

It may require you to enter your driver’s license information or your AGI from a past tax return to confirm identity and get your IL-PIN.

Then it will take you to a Payment Information page.

You’ll want to select “IL-1040 Estimated Payment” and enter your tax year. Make sure it’s for the correct year and quarter — this is very important. The example below is for the fourth quarter of 2021.

Then, enter your payment information and click the Submit button.

It will require you to enter and confirm your email address before clicking OK.

Make sure to print the confirmation screen, even though they will send you an email receipt — every once-in-a-while IDOR fails to push the request through, and the amount is not debited or recorded. If you have the print-screen, you can prove you attempted to pay it on-time and that the mistake was theirs.

It will also include a confirmation code, the date/time of the request, the reporting period and amount, and bank withdrawal information. You can click “Printable Confirmation” or just print the webpage to pdf.

Please make sure to note how much you paid to each agency and on which dates — and let your tax preparer know this information as well. Securely uploading copies of the final confirmation screen to your tax preparer or bookkeeper is a great practice, so they can easily store the info in your file.

And if you use QuickBooks or another bookkeeping program, please make sure to enter the quarter, year, and “estimated tax” so that you or your bookkeeper or accountant or tax preparer can make sure it’s applied to the correct year, and for the right type of tax.

For how to make IRS quarterly tax payments online, see my recent blog post on the topic, for step-by-step instructions.

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