The CTANFIncome function GetChildCareExpenseDeductionOfUnit returns the amount that the unit's earned income can be reduced based on the unit's total child care expeneses and the setting of the rule ChildCareExpensesCap. Note that this function does not take into account the actual amount of the unit's earnings (i.e. it doesn't check whether the computed deduction exceeds earnings)...this should be handled by the calling code. Nor does it take into account whether a child care expense deduction is permitted for the purposes that income is currently being determined...this should also be handled by the calling code, via the function IsChildCareExpenseDedUsedFor, which handles the rule ChildCareExpDedUsedFor. It returns true/false (deduction permitted/not permitted) based on the value of that rule, the applicant/recipient status of the unit, and the reason income is currently being determined (gross test, net test, benefit computation). The "reason" is passed to the function by the calling code.