Conversation so far:
What sort of financial trouble did Joe Louis have?
A combination of this largesse and government intervention eventually put Joe Louis in severe financial straits.
Did Joe Louis not pay his taxes?
Joe Louis's entrusting his finances to former manager Mike Jacobs haunted him. After the $500,000 IRS tax bill was assessed, with interest accumulating every year, Louis was in a predicament.
Did Joe Louis have any money in the end?
Donations, with an agreement by the IRS to limit its collections, allowed Joe Louis to live comfortably toward the end of his life.

Question: How much did he make in his comeback?
Self-contained rewrite: How much did Joe Louis make in his comeback?