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
Will IL tax my Roth conversions?
Conversions are taxable federally and typically flow to IL; IL retirement exclusion usually applies to distributions, not conversions—check IL guidance.
How do I amend my Illinois return?
File Form IL-1040-X after your original IL-1040 is processed; include revised schedules (e.g., Schedule ICR/CR/M) and explanations.
Why does Illinois distinguish pre-1969 and post-1969 gains?
Because Illinois enacted its income tax on August 1, 1969, any appreciation before that date occurred before the state had authority to tax income. Form IL-F preserves fairness by taxing only the gain realized since Illinois income tax law took effect. This approach avoids retroactive taxation while ensuring current gains are taxed appropriately.
When should Schedule FD be filed?
File Schedule FD with your annual IL-1040 return for the tax year in which the deferred income became federally taxable.
Why is Schedule M important for accurate Illinois taxes?
Illinois uses Schedule M to ensure fairness in applying its flat 4.95% tax rate. Because Illinois starts from federal AGI, this form ensures only Illinois-approved income is taxed and proper deductions are applied. It’s especially vital for retirees, military personnel, and taxpayers with multistate investments.
Important Notes
All calculations are estimates for guidance only. Always review your return and consider professional advice when submitting official filings.