OK, I went back over my Colorado return and discovered the credit calculated exceeds my tax liability. According to CO, you cannot take an Enterprise Zone Credit that exceeds your tax liability. Therefore, this credit is to be applied to next year's return.
CO Tax Form DR 1366, "Enterprise Zone Credit and Carryforward Schedule" Line 52, Column A, "Credit Available" shows the calculated credit. That same line, Column B, "Credit Used" shows a zero. However, Line 53 shows the calculated credit as, "This is the amount of carryforward available next year." In other words, this credit may be applied on next year's return, not on this year's return; that's why TurboTax is calculating a zero for the "Credit Used" figure.
