| When are the Colorado "C" corporation estimated income tax payments due?
A Colorado "C" corporation must file its estimated income tax payments as follows:
a. First installment, Voucher 1.
This is due on or before the 15th day of the fourth month of the tax year.
b. Second installment, Voucher 2.
This is due on or before the 15th day of the sixth month of the tax year.
c. Third installment, Voucher 3.
This is due on or before the 15th day of the ninth month of the tax year.
d. Fourth installment, Voucher 4.
This is due on or before the 15th day of the twelfth month of the tax year. | 
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