No, if not used, the money cannot be reimbursed. There is NO loophole here. In my opinion, now that you'll contributed the $10k, it is better to use it if it is not too late to change your arrangement. You save quit a bit tax by using the money; while the interest free loan still have to be paid back with after tax dollars. Depend on your income, part of the expense might be tax deductible, but it is no where close to FSA contribution, which is not even counted as your income. Some FSA plans all