Quick Takeaways
- Form 1099-G reports certain government payments that may be taxable to you, including Illinois tax refunds, credits, offsets, unemployment income, agricultural payments, and taxable grants.
- The Illinois Department of Revenue (IDOR) says current-year 1099-G information is usually available in mid to late January after the tax year. For example, 2025 1099-G information would be available in mid to late January 2026.
- You may receive a 1099-G if you itemized state tax deductions on Form 1040, Schedule A and your Illinois tax payments exceeded your liability by $10 or more.
- If you think your 1099-G is wrong, IDOR says to write to its Taxpayer Assistance Division in Springfield.
Why Form 1099-G Confuses So Many Taxpayers
Tax documents can feel stressful, especially when a form arrives and you are not sure whether it means you owe more tax, need to amend something, or simply need to report income correctly. The good news is that Form 1099-G is meant to help you report certain government payments accurately, not to create extra confusion. Illinois explains exactly what the form covers and when it is issued.
What Is Form 1099-G?
Illinois says Form 1099-G reports amounts issued by a government entity that may be taxable to you. This can include refunds, credits, or offsets from your Illinois state income tax, as well as unemployment income, agricultural payments, and taxable grants. IDOR also says it provides the 1099-G information to the IRS.
If the government sent you money related to taxes or certain benefits, Form 1099-G is the paper trail that helps determine whether that payment belongs on your federal return. Illinois notes that the amount may be taxable for federal purposes, but if it is reported as income on your federal return, it is subtracted from Illinois taxable income because it is not taxable to Illinois.
What Does the Illinois Department of Revenue’s 1099-G Report?
Illinois says its 1099-G reports the amount of overpayment of state tax or any tax rebate you received in a tax year. That overpayment may have been received as:
- a refund,
- a credit carried forward to a later year,
- a charitable donation choice, or
- an amount applied to another liability.
Why this matters
The number on your 1099-G may not always match the cash you personally received, because it can reflect how your overpayment was used across different tax obligations.
Who Receives a 1099-G?
Illinois says you will receive a Form 1099-G if:
| Condition | Explanation |
|---|---|
| You deducted Illinois state income taxes on Form 1040, Schedule A | The form helps track possible taxable state tax refunds. |
| Your Illinois tax payments exceeded your actual liability by $10 or more | This includes a refund, credit applied to next year’s estimated tax, or overpayment used to pay another liability. |
| You received an individual income tax rebate or property tax rebate in the prior year | Those rebate amounts can also trigger a 1099-G. |
How Is the 1099-G Amount Calculated?
Illinois says the amount on Form 1099-G is calculated as:
tax payments minus Illinois income tax liability.
Payments may include
- estimated payments
- credit transfers
- return payments
- amended tax payments
- extension payments
- Illinois withholding income tax credit
- rebates issued
- pass-through payments
Illinois also clarifies that tax liability means your Illinois income tax liability before penalty and interest are added.
Why Your 1099-G Might Be Different from Your Refund
This is one of the most confusing parts for taxpayers. Illinois says your 1099-G may be greater than your refund or credit carryforward if part of your overpayment was used to:
- pay use tax,
- pay penalty and interest, such as a late estimated payment penalty,
- pay a prior year’s tax liability or another tax liability,
- pay a federal, state, or municipal offset, or
- make a voluntary donation on Schedule G.
When that happens, Illinois still reports the full original overpayment on the 1099-G. If you received multiple refunds, rebates, or overpayments for one tax year, Illinois reports them on one Form 1099-G for the year you received the money or overpayment.
Why Your 1099-G Might Be Less Than Expected
Illinois also says your 1099-G may be less than your refund or credit carryforward because:
- Earned Income Tax Credit is refundable, but it is not an itemized state tax payment for federal purposes and therefore is not reported as income on Form 1099-G.
- If you received a refund or overpayment after December 31, it is reported on the following year’s 1099-G.
When Can You Look Up Your 1099-G?
Illinois says you can look up your 1099-G using MyTax Illinois. The state also notes that current-year 1099-G information becomes available in mid to late January after the tax year ends.
Practical example
If you need 2025 1099-G information, Illinois says it should be available in mid to late January 2026.
What If You Think Your 1099-G Is Wrong?
If you believe your 1099-G is incorrect, Illinois instructs you to write to:
TAXPAYER ASSISTANCE DIVISION Illinois Department of Revenue PO BOX 19001 SPRINGFIELD IL 62794-9001
Common Mistakes to Avoid
Here are the most common errors taxpayers make with Form 1099-G:
1) Assuming every 1099-G amount is taxable in Illinois
Illinois says amounts reported on 1099-G may be taxable for federal purposes, but they are not taxable to Illinois when reported as income on your federal return.
2) Forgetting that the form may include offsets or credits
Your refund amount and your 1099-G amount may differ because of offsets, taxes paid, donations, or other liability payments.
3) Missing the tax year timing
A refund or overpayment received after December 31 goes on the next year’s 1099-G, not the prior year’s.
4) Ignoring the federal side
Illinois says the form may matter on your federal return, especially if you itemized deductions and claimed state tax payments on Form 1040, Schedule A.
Pro Tips for Handling Your 1099-G
- Log in to MyTax Illinois early in the season if you want to review your form as soon as it is available.
- Compare the 1099-G amount with your prior-year Illinois return so you understand why the number may differ from your refund check.
- If your refund was used to pay another liability or offset, keep your notices and return records together for easier filing.
- If something looks off, contact IDOR in writing so you have a documented request.
Final Thoughts
Form 1099-G is one of those tax forms that can feel more intimidating than it really is. At its core, it is an information statement that helps you report certain government payments correctly. If you received an Illinois refund, rebate, offset, or other qualifying payment, this form can help you understand what needs to be reported on your return and why the number may not match your refund exactly.
