Introduction
If you're mailing a paper Illinois Individual Income Tax Return, the address depends on one thing: whether you're enclosing a payment.
- With payment: P.O. Box 19027, Springfield, IL 62794-9027
- Without payment (refund or zero balance): P.O. Box 19041, Springfield, IL 62794-9041
Those are the tax year 2025 addresses published by the Illinois Department of Revenue (IDOR). Addresses, attachments and filing options can change by tax year and form type.
For Australian taxpayers with Illinois income or past Illinois residency, a wrong address or missing signature can mean weeks of delay. This guide covers the address lookup, a mailing checklist, forms, and ways to avoid delays.
Key Takeaways
- Choose the address by payment enclosure, not by a general Illinois government address.
- Check the current-year IDOR instructions before mailing.
- Sign and date the return, and attach only the required schedules.
- Keep a full copy, and consider e-filing if you're eligible.
Where to Mail an Illinois IL-1040 Tax Return
Mailing address by filing outcome
For tax year 2025 original returns, IDOR's address page lists these destinations:
| Outcome | Address |
|---|---|
| Refund, no payment enclosed | Illinois Department of Revenue, P.O. Box 19041, Springfield, IL 62794-9041 |
| Balance due, payment enclosed | Illinois Department of Revenue, P.O. Box 19027, Springfield, IL 62794-9027 |
| No refund and no balance due | Illinois Department of Revenue, P.O. Box 19041, Springfield, IL 62794-9041 |
IDOR publishes a "without payment" address but no separate zero-balance address, so zero-balance returns use the without-payment one. If you enclose an IL-1040-V voucher with your return, use the return's address, not the standalone voucher address.
Which address should you use?
Check the completed IL-1040. If you owe tax and are sending a check, use the payment address. If you're due a refund or owe nothing, use the without-payment address.
Always confirm against the current-year IL-1040 instructions and IDOR's addresses page before sending.
Special mailing situations
Other forms have their own destinations. Don't default to the standard IL-1040 address.
- IL-1040-X (amended return): P.O. Box 19047, Springfield, IL 62794-9047
- IL-505-I (extension payment): P.O. Box 19005, Springfield, IL 62794-9005
- Standalone IL-1040-V: Springfield, IL 62726-0001
- IL-1040-ES (2026 estimated tax): Springfield, IL 62736-0001
Nonresident and part-year filers have no separate address. Attach Schedule NR and use the original-return address.
For a deceased taxpayer on a joint return, enter "deceased" and the date of death, and the surviving spouse signs "filing as surviving spouse."
Couriers are different. The addresses above are P.O. Boxes, and no courier-specific street address is published there. Contact IDOR to confirm an acceptable address before using FedEx, UPS or DHL.
IDOR has also warned that automated USPS postmarks may differ from your drop-off date, so mail early.
What to Include Before Mailing an Illinois IL-1040
Required identification and signatures
Confirm your name, address, SSN or ITIN, filing status and contact details. Then sign and date. Both spouses must sign a joint paper return. An unsigned return is treated as not filed and may attract a nonfiler penalty.
Federal return and income documentation
Attach the federal forms and schedules the Illinois instructions require for your situation. A retirement income subtraction, for example, needs federal Form 1040 page 1, Schedule 1 and the relevant W-2 or 1099 forms.
- Attach Schedule IL-WIT plus W-2 and 1099 forms showing Illinois income and withholding
- Include records for both spouses on a joint return
- Send copies, not originals, and follow the order in the instructions
Schedules, payment, and refund information
Include only the schedules that apply:
- Schedule NR for nonresident or part-year income
- Schedule CR for tax paid to another state
- Schedule IL-WIT for Illinois withholding
- Schedule 1299-C for credits
- Schedule ICR for property-tax and education-expense credits
- Schedule M for other additions and subtractions
If paying by cheque, make it payable to "Illinois Department of Revenue." Write your SSN (and your spouse's on a joint return) and the tax year in the lower-left corner. Staple the cheque and IL-1040-V to the front of the return. Never send cash.
For direct deposit, enter the routing number, account number and account type. Checking routing numbers have nine digits, and account numbers can run to 17. IDOR deposits refunds only into U.S.-located accounts. An overseas bank means a paper cheque. That matters for taxpayers living in Australia.
Final envelope checklist
- Signatures and dates on the return
- Required schedules and withholding copies
- W-2 and 1099 copies where applicable
- Cheque and IL-1040-V, if paying
- Correct address and enough international or domestic postage
- A complete copy for your records
Use tracked mail where possible. Confirm postmark and deadline rules for your tax year.
How to File an Illinois State Tax Return
E-filing versus mailing a paper return
E-filing gives faster processing and confirmation. IDOR estimates refunds in about four weeks for electronic returns, while paper returns may take more than eight weeks.
MyTax Illinois has limits for 2025. To use it, you generally need:
- Full-year Illinois residency
- A 2024 IL-1040 already on file
- An SSN or ITIN and a valid email
- No return already filed for the year
Complex additions, subtractions, and credits are restricted. Nonresidents and part-year filers can't use MyTax but may use other IDOR-listed e-file routes. Paper is the fallback.
Paper-filing steps
- Complete the correct-year IL-1040 and any required schedules
- Review the refund amount or balance due before you sign
- Sign and date the return (both spouses, if filing jointly)
- Attach W-2s, schedules, and payment if you owe
- Choose the correct IDOR mailing address for your situation
- Mail the packet and keep proof of filing
Filing deadlines and confirmation
The 2024 return was due April 15, 2025, and the 2025 return is due April 15, 2026. A due date on a weekend or holiday moves to the next business day. An automatic six-month extension does not extend time to pay.
Track current-year refunds with Where's My Refund?, which updates each business day.
Illinois Tax Forms and Related Filing Situations
Where to find Illinois income tax forms for 2024
Start at IDOR's individual forms page, which links to current forms and the prior-year archive. The 2024 IL-1040 and instructions are in the archive. Pick the right year, because current, prior-year and amended forms carry different instructions and mailing details.
How to find adjusted gross income on Form 1040
On the 2024 federal Form 1040, AGI is on Line 11. It was Line 8b in 2019 and Line 7 in 2018, so use the form for the year you're filing.
On the 2024 IL-1040, Line 1 starts with federal AGI. Additions and subtractions then lead to Line 9, Illinois base income. Schedule M handles other adjustments.
Related Illinois forms
- IL-1040-X: corrects an already-filed return
- IL-1040-V: payment voucher for individual tax
- IL-1040-ES: estimated tax payments
- Schedule NR: nonresident and part-year income
Don't substitute one for another unless your situation requires it.
Residency and cross-state issues
Illinois domicile means where you live and intend to return after temporary absences. Working abroad temporarily may not change your domicile.
Part-year residents are taxed on all income while resident, plus Illinois-source income while nonresident. Remote workers and multi-state earners should read Schedule NR instructions and consider professional advice.
How to Avoid IL-1040 Mailing and Processing Delays
Common mistakes to check before sending
IDOR's common-errors alert flags incorrect personal information, filing status or bank details, unreported income, math errors, and unsigned or undated returns. Add these to your checklist:
- Outdated or wrong address
- Missing schedule
- Wrong SSN
- Missing IL-1040-V with a payment
Delivery records and follow-up
Keep the signed return, all attachments, payment evidence, mailing receipts, tracking and any IDOR correspondence.
When professional tax support may help
If you're an NRI or OCI, or you move between countries, Illinois residency, DTAA relief and foreign-account questions get complicated quickly. VJM Global provides cross-border tax and accounting support, including US individual return preparation (Form 1040 and 1040-NR) and DTAA advisory for internationally mobile taxpayers. VJM Global isn't affiliated with the Illinois Department of Revenue.
Frequently Asked Questions
What is the mailing address for my Illinois (IL-1040) tax return?
It depends on payment. For 2025, returns with payment go to P.O. Box 19027, Springfield, IL 62794-9027. Returns without payment go to P.O. Box 19041, Springfield, IL 62794-9041. Verify against current instructions.
What documents do I need to include when mailing my Illinois (IL-1040) tax return?
Include the signed return, applicable schedules, Schedule IL-WIT with W-2 and 1099 copies, and required federal pages. Add a check and IL-1040-V if paying.
How do I file my Illinois state tax return?
E-file through MyTax Illinois or another approved route if eligible. Otherwise complete, sign, attach documents, address and mail the paper IL-1040.
How do I find my adjusted gross income (AGI) on Form 1040?
Find the line labeled adjusted gross income on the correct-year Form 1040. It's Line 11 for 2024, but line numbers change between years.
Where can I find the Illinois income tax forms for 2024?
Use IDOR's individual income tax forms page and open the prior-year archive. Select the 2024 IL-1040, instructions, schedules and payment forms.
