Great comments!
Easier said than done in Reality!
Though it's the members/partners/shareholders of the pass-through entities RESPONSIBILITY to track their basis, it typically falls to their accountant/tax professional, who reluctantly has No other choice but to do it for them, WITHIN REASON.
Don't forget that the tax prof will Bill you for the taxpayer's Irresponsibility of Not tracking the basis!
Imagine if that basis tracking project goes back several years? Heaven help the tax professional!
