Only in America, or so Daniel Dubois has found out the hard way.

An attorney filed a lawsuit on Dubois’ behalf against Don King Productions on Monday night in Broward County, Florida, where King’s promotional company is based. The British heavyweight alleges in court documents that King still owes him most of his seven-figure purse for his fourth-round stoppage of Trevor Bryan on June 11 in Miami.

King promoted the card headlined by Dubois’ victory over Bryan, who is represented by King. Dubois contends King still owes him somewhere between $463,274.32 and $938,274.32 for a win that was streamed as the main event of a pay-per-view show on King’s website.

The exact remaining amount of Dubois’ $1,402,200.45 purse that King still owes Dubois is unclear because Dubois’ team doesn’t know whether King paid his sanctioning fee to the WBA and/or his taxes to the United States government.

According to the lawsuit, a copy of which was obtained by BoxingScene.com, Dubois was contracted to pay three percent of his purse to the WBA for sanctioning their title fight. Beyond that $42,066.01, an additional 30 percent of Dubois’ entire purse, or $420,660.14, was supposed to be paid to the IRS, in accordance with U.S. federal law, for taxes as a foreign national.

King was supposed to pay Dubois his net purse of $938,274.32 immediately after his fight. Before filing this lawsuit, Dubois’ attorney made numerous attempts to collect his purse from King in the seven weeks since Dubois defeated Bryan, who was contracted to earn $1,713,800.55 as the defending WBA world champion.

There is no mention in the lawsuit as to whether Bryan’s purse has been paid in its entirety.

King submitted a winning purse bid of $3,116,001 on March 21 to secure the right to promote the Dubois-Bryan bout.

He beat out Frank Warren’s Queensberry Promotions, which represents Dubois. Queensberry bid $2,503,000. Bryan (22-1, 15 KOs), of Schenectady, New York, was due 55 percent of that winning bid and 45 percent was supposed to be paid to Dubois (18-1, 17 KOs).

Dubois credited King for paying $475,000 of his total purse because Dubois was partially paid through a license fee from BT Sport, which televised Dubois-Bryan in the United Kingdom and Ireland. That’s why Dubois claimed that King owes him somewhere between $463,274.32 and $938,274.32, depending upon whether King paid the IRS and/or the WBA on his behalf.

BoxingScene.com has learned that the Florida Athletic Commission has been investigating King’s handling of this event since mid-June. Big Fight Weekend’s Dan Rafael first reported Tuesday that Dubois filed a lawsuit against King.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.