The dollar limit for contributions to a medical FSA for 2015 is $2,550. Each spouse can contribute up to this limit as long as each works for an employer offering such a plan. This enables a couple to exclude from their taxable compensation a total of $5,100. This is so even if both spouses work for the same company.
On Form 1040X, you may file an amended return within a three-year period to claim a refund or correct a mistake made on an original or previously amended return.