Mike Rotunda returned to the WWF in April 1991, becoming Irwin R. Schyster, abbreviated to I.R.S.. Schyster had a heel gimmick as a former IRS tax collector from Washington, D.C., harassing wrestlers and fans as "tax cheats" and scolding them to "pay their fair share". For example, at a show in Rhode Island, he attacked the state for being a tax haven for yacht owners from New York, or when wrestling in New Hampshire, he would get on the microphone and criticize the fans there for not having to pay a state income tax. When wrestling in England at SummerSlam 1992, he admonished the crowd for not paying taxes and therefore being a burden on the Royal Family. To further add to this persona, one of his finishing moves was called The Write-Off (i.e., a flying clothesline to an oncoming opponent).

In February 1992, Schyster formed the tag team Money Inc. with Ted DiBiase; the two won the WWF Tag Team Championship together three times and was the dominant Tag-Team of 1992–1993. In the eighteen months Money Inc. were together, they held the titles for a total of almost fourteen months. Money Inc.'s first title reign was at the expense of The Legion of Doom, making Rotunda the only wrestler to twice defeat them for a tag team title. They then feuded with the Natural Disasters, losing the titles to them and then regaining them a few months later. Finally, in spring 1993, Money Inc. entered into a months long feud with The Steiner Brothers, and in June the two teams traded the titles three times in ten days, with DiBiase and IRS losing the tag team title twice to the Steiners. Ted DiBiase retired from wrestling to become a commentator in the summer of 1993, resulting in Schyster going back to singles competition after a final attempt to reclaim the tag-titles in a cage match in the lead-up to Summerslam '93 in a losing effort against the Steiners.

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