[gamblor956]

What exchange account? -- yes, many (IMO foolish) users keep coins in exchanges, many don't. :)

Doesn't matter, only that you use an exchange for the guidance to apply. If you receive the coins directly, this guidance isn't really relevant.

So I guess you'd take the position that if you got access to the coins at the instant of the fork, when there is no FMV yet, then you'd report $0 income and have a $0 cost basis. Otherwise, if your access was delayed and there was a FMV, you'd treat that as income and it would become your cost basis?

Yes, correct. If the forkcoin is worth $X at the time of receipt, you are taxed on $X income because your cost basis at the time is $0. But because you were taxed on $X, your cost basis is set to $X.