I have held a mutual fund since the 80's which I have added to and subtracted from over time. I used the ID method to sell shares back in the 90's when I sold a few shares, and I've added shares at various prices too. The fund merged with another fund in April, 2017. So all the shares I bought over the years were exchanged into the new fund. They exited the old fund at $59.82 per share, exchanged for $29.57 per share into the new fund.
I'd like to sell those shares now but I can't figure out how to calculate COA. I've seen some fomulas around for this, one of which says the COA is the FMV as of 1-31-2018. If that's so, my COA will be substantially lower than I expected. It seems too good to be true. In any case, I don't want to create a tax problem here. Any help would be appreciated.
