Indeed you can use any bank you want for a HSA, but if your employer provides a match or deposit to an HSA you may be tied to whoever they use. Personally my employer deposits a fixed amount annually in an HSA, only into their bank of choice. A perk of that is no fees in that account. Their bank does not work with mint, so I have my own HSA with another bank. When my employer deposits money in my account with their bank I withdraw it immediately and then deposit in my own HSA of choice. My own contributions I just claim when I file taxes, those contributions are deductible from your overall government theft for the year.