In the United States, a flexible spending account (FSA), also known as a flexible spending arrangement, is one of a number of tax-advantaged financial accounts, resulting in payroll tax savings. One significant disadvantage to using an FSA is that funds not used by the end of the plan year are forfeited to the employer, known as the "use it or lose it" rule. Under the terms of the Affordable Care Act however a plan may permit an employee to carry over up to $550 into the following year without losing the funds but this does not apply to all plans and some plans may have lower limits.