Did you have a dependent care FSA at work to pay for expenses pre-tax? That would be listed on your W-2 in box 10. If you had a $5000 FSA, that uses up your eligibility to also claim the dependent care credit. Since the maximum expenses for the credit are $6000 with two or more children, a $5000 FSA would leave you with $1000 of leftover expenses to count toward the credit.
