If you are terminating employment, all pending deductions must be met prior to receiving a payment. FSA deductions are considered as a current deduction so in this case, if you work two days in December, you would be obligated to honor your pledge amount for December. For example, if you are a semi-monthly employee, you will not get paid for your time worked on December 1st and 2nd until the December 31st paycheck. Therefore the deduction on December 31st is for a time period during which you were an active employee.