I have an HSA plan that was funded by myself and my employer. Due to a math error on my part, I mis-calculated how many pay periods there were in the year, which caused the HSA contributions from my employer to exceeds the IRS limits by a small amount ($37.50.) There have been no withdrawals from my HSA this year, so the excess was not used for medical expenses.
I have a form which I can submit to my HSA custodian to have them shift that excess contribution to 2018. However, they will charge a $20 "processing fee" for the convenience, so I've decided that the best course of action is to take the 6% tax hit on the $37.50 since that's negligible.
I'm not sure, however, how to report this to the IRS. I usually file a 1040EZ, but I muddled through Pub 969 which directed me to Form 5329, which seems to indicate that I need to file a regular 1040 instead.
Since my W2 will show the excess contribution, as will the HSA forms, is it sufficient to fill out the regular 1040 and submit the 5329 for the excess $37.50? Or is there something else I need to do instead?