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Can I use a different HSA than PayFlex that came with aetna?
Much of this is incorrect. Aetna owns Payflex for starters, and it's your EMPLOYER who decides which banks and brokers to offer, not Payflex. An HSA is a checking account with an investment account option after a minimum balance is met. A majority of U.S. employers only OFFER an HSA option but don't contribute a penny, so you're lucky you get anything.  The easy solution is just keep the money that is sent to your HSA checking account in your checking account, and once a year roll it over into a different bank's HSA. The vast majority of banks offer HSAs that have no ties to a particular broker (i.e. Citibank, PNC, Chase). I have all my HSA funds in HSA Bank which is online but services lots of employers. Not true that most payroll deductions or employer contributions go to a single HSA custodian (bank).  They might offer a single bank that either contracts with an investment provider or lets you invest anywhere. But most employers making contributions are large or mid-market employers offering multiple banks, and that trend is growing fast because of defined contribution, private exchanges and vendor product redesigns. Basically, nobody likes having a second bank account for their HSA when their home bank offers one.