FSA does have the concept of rollover of up to $600 but its up to the employer to decide. I imagine that full rollover is not allowed because otherwise people w

FSA does have the concept of rollover of up to $600 but its up to the employer to decide. I imagine that full rollover is not allowed because otherwise people would use the FSA to defer some tax payments to end of year. But there are ways they could have handled it better.