Illinois Form IL-1040-V – Payment Voucher for Individual Income Tax (2026)
Last reviewed: 2025-11-07
Use the Illinois Tax Form Calculator Form IL-1040-V: Payment Voucher for Individual Income Tax as a stand alone tax form calculator to quickly calculate specific amounts for your 2026 Illinois state tax return. Alternatively, you can use one of our Combined Federal and State Tax Estimators to quickly calculate your salary, tax, and take-home pay.
Form IL-1040-V is the payment voucher used to submit any balance due on your Illinois individual income tax return (Form IL-1040). It accompanies checks or money orders mailed to the Illinois Department of Revenue. Taxpayers paying electronically do not need to submit this voucher.
When to Use Form IL-1040-V
Use Form IL-1040-V if:
- You file a paper Form IL-1040 and owe tax for 2026.
- You are making a payment separate from an electronic filing.
- Your Illinois return shows a balance due greater than $1,000.
Form IL-1040-V ensures your payment is properly applied to your account and matched with your return.
Completing the Voucher
- Enter your total Illinois income tax liability from your return (Line 1).
- Enter your total payments and withholding already made (Line 2).
- Subtract Line 2 from Line 1 to determine your balance due (Line 3).
- If Line 3 is greater than zero, this is the amount you must pay with your voucher.
Make your check or money order payable to “Illinois Department of Revenue.” Write your Social Security number and “2026 IL-1040” on your payment. Mail the completed voucher and payment to the address printed on the form or visit Illinois DOR Payment Options for electronic payment methods.
| 1 | Total Illinois tax liability | |
| 2 | Total payments and withholding | |
| 3 | Balance due (Line 1 − Line 2) | |
| 4 | Minimum threshold ($1,000) – payment required if Line 3 ≥ this amount |
Electronic Payment Options
Illinois strongly encourages taxpayers to pay electronically. You can pay online using:
- MyTax Illinois – the official online filing and payment portal.
- ACH debit or credit card (Visa, MasterCard, Discover, or American Express).
Payments made electronically before the filing deadline are considered timely even if the paper voucher is not mailed.
Example
Example: Your Illinois total tax for 2026 is $4,200, and you had $3,500 withheld during the year. The difference is $700. You include a check for $700 with your IL-1040-V and mail it by April 15, 2026.
Filing Deadline
Payments must be postmarked by the due date of your Illinois individual income tax return (usually April 15). If the due date falls on a weekend or holiday, the next business day applies. Late payments may incur interest and penalties under 35 ILCS 5/804.
Last reviewed: 2025-11-07: If you believe this form requires an update, please contact us.
Related Forms and Resources
- Form IL-1040 – Individual Income Tax Return
- Form IL-1040-ES – Estimated Income Tax Payments
- Form IL-2210 – Penalty Computation for Individuals
- Illinois DOR – IL-1040-V Form Information
Quick Access Tools
Frequently Asked Questions
Why is Schedule 1299-C important for transparency?
It maintains fairness within Illinois’s incentive programs. By recapturing credits when eligibility changes, the state ensures that incentives reward long-term economic activity rather than short-term gains. For taxpayers, it preserves credibility and helps avoid legal disputes with the Department of Revenue.
What documentation must accompany Schedule 1299-DA?
Attach copies of the other states’ filed tax returns, W-2s, or K-1s showing withholding and payments. Failure to attach proof can lead to denial of the credit. For convenience, you can track and upload copies directly through the MyTax Illinois portal.
K-12 education expense credit in IL?
Illinois offers a K-12 education expense credit (caps/eligibility apply). See the credits list in results.
Do unused credits carry forward to future years?
Most individual credits on Schedule ICR (Property Tax, Education Expense) apply only to the current tax year and cannot be carried forward. However, certain business-related credits listed on Schedule 1299-A can be carried forward or backward depending on statutory rules.
Saver’s Credit in IL?
The Saver’s Credit is federal; IL doesn’t usually add a separate state version.
Important Notes
All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.