Excess HSA contribution in 2021

Currently doing my taxes and realized that I had made an excess contribution of $400 to my HSA during 2021. This HSA is from a previous employer and I think my employer made a contribution on top of my payroll deductions which were set to get me exactly to the maximum. I didn't realize this when filing last year so I'm trying to deal with it now.

I have a form for return of excess contributions which I have filled out except there is a line for earnings on excess contributions which I do not know how to calculate or find out. My HSA provider didn't have any information on how to figure this out, but I just have my HSA as pure cash no investments so all I would have earned is just the really low interest rate that the account provides. It was certainly less than $10 and I'm willing to bet that it's less than $1 of interest. Am I safe to just put $0 for that or just put some amount that I know it can't exceed? It would be nice to get this money back, but I am really more concerned of getting it fixed so I don't get the 6% deducted from return every year.

submitted by /u/HaveBlue-
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