Although the amount is very small, please report the Form 1099-SA. IRS has a copy of it and will be looking for it on your tax return. If the funds were used to cover your qualified medical expenses, it will not make a difference on your return. You will be showing that the amount is used "correctly" and it is not taxable.
If the return has been e-filed and accepted, you can only
make the change by amending your tax return. The 1040X for amending 2015
returns will not be available until mid-February. You should not try to
amend your return until it has been fully processed and you have received your
refund or your payment has cleared.
If your return is e-filed but pending - please wait. If it
is rejected for some reason, you can make a change then and re e-file.
