If you notice an error regarding your allotment, you should notify WageWorks, Inc. (who administers the enrollment and claims processes for FSAFEDS), who will work with BENEFEDS to determine the required course of action.
If the error results in the allotments being less than your scheduled amount, your allotments will be recalculated based on the number of pay dates remaining in the Benefit Period.
Let's say you elected $2,600 to a Dependent Care FSA and your election amount will be deducted over 26 pay periods, resulting in a per pay date allotment of $100. Then, your payroll provider fails to withhold your scheduled allotment on pay period 9 ($800 already deducted). That leaves $1,800 of the $2,600 to be deducted from your pay for the rest of the year. We would recalculate your allotments by spreading the remaining $1,800 over the remaining 17 pay periods. Your "new" allotment would be $105.88 per pay period so that your account is funded in full by the last payday of the year.