I need to list the HSA account balance as of December 31, 2017. It would seem to be simple to just retrieve from the 1099-SA as it shows the value of the account on that date. Let's say the account at the end of the year actually had $1,000.
However I have made several contributions for 2017 in 2018 to "catch up", as well as had qualified medical disbursements in 2018. If I added $2,000 to the account would my true end of year account value actually be $3,000 or just the original $1,000?