Are you in Ontario & do you have a spouse (or another caregiver for the child)? If so, your refund may have dropped when you answered that you were not the only caregiver for the Childcare Access and Relief from Expenses (CARE) tax credit. That credit is based on the incomes of all of the child's caregivers (including your spouse), not just your own. It's reduced the higher the total of all the caregivers' incomes is.