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Hi from Just Answer. I'm PDtax, and will assist.
As long as you withdraw the $456, which is the excess, by the due date of your 2015 1040, you will be fine.
The ($916.62-456=)$460.62 will be unused as on 12/31/15, and you get to keep that balance for future years.
Thanks for asking at Just Answer. Positive feedback is appreciated. I'm PDtax.
You can withdraw the $456 and save any tax and penalty cost. If you leave the excess in the HSA, there is a 6% penalty for each year you leave the funds in the account. Report that on form 5329 if you choose to leave the $$ in the account.
The remainder can be left in the account without penalty. HSA contributions you don't use are treated much like IRA contributions, and can grow tax deferred in the same manner.
Don't forget to rate my assistance when we are done. I'm PDtax.