You usually can’t contribute to both an HSA and an FSA in the same year. But you may have access to special HSA-compatible FSAs that let you contribute up to $2,600 pretax to the FSA for the year, in addition to contributing up to the maximum to an HSA. You can only use the money in the limited-purpose FSA for dental and vision expenses until you reach your health plan’s deductible, but then you can roll it into a regular FSA and use the money for any FSA-eligible expenses. Most employers now offer limited-purpose FSAs alongside their HSAs, says Jody Dietel, chief compliance officer for WageWorks, which administers FSAs.