According to Redpath and Greg Urban, what is the threshold amount for determing if a substantial basis adjusment is mandatory?

The threshold required to conclusively state whether a substantial base adjustment is required is $ 250,000.

Answer: According to Ian Redpath and Greg Urban, the threshold amount required for conclusively stating whether a substantial basis adjustment is mandatory is $250,000. The amount required is $250,000 in order for one to know whether they are in need for a substantial basis reduction or maybe not. It's required when the amount indeed exceeds $250,000.