1099-DA cost basis complicates the tax record, and even if a program is created that makes everything unified, complications will exist, and failure to do so may return you to FIFO, which may make a difference in calculating taxes if you use another method.
more from the story!
If the exchange doesn’t support specific identification, they will default to FIFO reporting for all their customers. Meanwhile, taxpayers who previously used HIFO (highest in, first out), CCFO (closest cost, first out) or some other cost-basis method in prior years end up with a perpetual cost-basis mismatch. The exchange issues a 1099-DA on a FIFO basis and taxpayer A calculates a totally different gain or loss using their own cost-basis method. You should start to see where the extra work is creeping in.
get ready for a new IRS tax form guys. it's called 1099-DA. Double trouble that's what the D stands for.
all you can do is hope they don't come out with it.Quote
Tracking and calculating gains separately for each address is a never-ending headache and may lead many to stop trading, so imposing taxes based on returns will solve many of this headaches.
who would want anything to do with anything that made them have to do something like that? i would have to be guaranteed 100% returns to even go through something like that. 
