Originally Posted by
Morgoth
Dick is a billionaire (or millioner, I don't remember for sure, it was in the beginning of Taylor's run), since Alfred left him his fortune in his will, and it turned out he also was insanely wealthy.
Damian is the direct heir to the Waynes and Al Ghuls, so in theory he's the richest now, or at least will be. But in the past it was shown, that he had complete access to Bruce's wealth.
Luke and Jace are backed up by Lucius, who actually has Bruce's fortune.
So, techinally these four are the richest. Tim, Jason, Steph, Cass (and perhaps Babs after the scene above) are probably getting allowance.