Data and ReportsDepartment of Revenue - Colorado 2026

1. Click ‘Get Form’ to open it in the editor.
2. Begin with Part 1 by entering your current year tax liability on line 1. Ensure you include any credit recapture after reducing for all credits except estimated tax and withholding payments.
3. Proceed to Part 2, where you will calculate the required annual payment. Enter the current year tax liability on line 4, then calculate and enter 70% of that amount on line 5.
4. For line 6, input the previous year's Colorado tax liability. If you did not file a return last year, use the amount from line 5.
5. In Part 3, compute the penalty by filling out lines 10 through 22. Start by entering each quarterly payment due date in column one of line 10.
6. Complete the annualized installment method schedule in Part 4 if applicable, ensuring to follow the instructions for calculating annualized taxable income and installment payments.

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