I agree with Randy. And also, be prepared with how you will deal with overdrafts - because even though they are not suppose to be able to overdraw, because most HSA's come with a Debit Card, it will happen. It is my understanding that the account can no longer be considered an HSA and IRS Reporting Rules will have to be followed.
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I use to think I was a smart cookie before I started working in Compliance. Now, I have mastered the art of the blank stare!