Illinois Form IL-1040 Schedule CR – Credit for Tax Paid to Other States (2026)
Last reviewed: 2025-11-07
Use the Illinois Tax Form Calculator Form IL-1040 Schedule CR: Credit for Tax Paid to Other States 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.
Schedule CR prevents double taxation by allowing Illinois residents and part-year residents to claim a credit for income tax paid to other states. You must complete this form if you reported out-of-state income on your federal return and that income is also taxable by Illinois. The computed credit carries to Form IL-1040, Line 16.
When to File Schedule CR
File Schedule CR if, during 2026, you earned wages or income in another state and that state required income-tax withholding or payment. This includes remote work, dual residency, and multi-state business activity. The credit is based on the lesser of Illinois tax due on that income or the actual tax paid to the other state.
How the Credit Works
The Illinois flat income-tax rate of 4.95% applies to all taxable income. When you compute the credit:
- Determine income taxed by both jurisdictions (Line 3).
- Multiply by the Illinois rate to calculate the Illinois tax on that income (Line 4).
- Enter the amount of tax actually paid to the other state (Line 5).
- The credit allowed (Line 6) is the lesser of Lines 4 or 5.
Attach copies of the other state’s return and proof of payment. Without supporting documents, the credit will be denied.
If you have income from more than one state, complete a separate Schedule CR for each and total them on Line 7. The total transfers to IL-1040.
| Step 1 – Identification | ||
| 1 | Name of other state(s) where tax was paid | |
| 2 | Type of income taxed by both states (wages, dividends, etc.) | |
| Step 2 – Credit Computation | ||
| 3 | Income taxed by both Illinois and the other state(s) | |
| 4 | Illinois tax rate (4.95%) × Line 3 | |
| 5 | Tax actually paid to the other state(s) on Line 3 income | |
| 6 | Credit allowable (lesser of Line 4 or Line 5) | |
| 7 | Total credit from all states (if more than one, attach detail) | |
| 8 | Enter total on Form IL-1040, Line 16 | |
Examples and Edge Cases
Example 1 – Dual-State Employment: An Illinois resident working remotely for an Iowa employer pays Iowa state tax on wages also taxed by Illinois. Line 3 lists the taxable Iowa wages, Line 5 the Iowa tax, and Line 6 calculates the lower of Illinois or Iowa tax. The result offsets part of Illinois liability.
Example 2 – Part-Year Move: A taxpayer relocates from Illinois to Missouri mid-year, paying both states on overlapping income. Schedule CR ensures only income earned while an Illinois resident is eligible for the credit. Cross-reference with Schedule NR.
Example 3 – Partnership Income: Illinois partners receiving K-1s showing taxes paid to another state must attach those K-1s and claim the credit through Schedule CR rather than a direct subtraction on Schedule M.
Tips for Compliance
- Keep signed copies of all out-of-state returns.
- Ensure the other state’s income corresponds exactly to that taxed by Illinois.
- Do not include local-city taxes; Schedule CR covers only state-level income tax.
Last reviewed: 2025-11-07: If you believe this form requires an update, please contact us.
Further Guidance and Related Forms
- Form IL-1040 – Individual Income Tax Return
- Schedule NR – Nonresident and Part-Year Resident
- Schedule M – Additions and Subtractions
For official reference, see the Illinois Schedule CR Instructions (2026) on the Illinois Department of Revenue website.
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Frequently Asked Questions
Do I need to file IL-1040-X if the IRS changes my income?
Yes. If the IRS adjusts your federal return and it affects Illinois tax, you must file IL-1040-X within 120 days of receiving the federal notice.
Are donations made through Schedule G-L tax-deductible?
Yes. Your Schedule G-L donations are eligible for a federal charitable deduction if you itemize on your federal Form 1040 Schedule A. Keep a copy of the filed schedule and any Lottery confirmation of your gift. The contribution will increase your Illinois payment or reduce your refund, but may lower your federal taxable income in the following year.
Changing jobs mid-year in IL
Update income/withholding and frequency; brackets are flat but credits/exemptions still matter.
Who must file Schedule FD?
You must file Schedule FD if you are a former Illinois resident who receives income (such as installment sale gains or deferred bonuses) sourced from Illinois that became taxable for federal purposes during 2026.
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.
Important Notes
All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.