The former Law & Order star appears in the movie - written and directed by his brother Peter - as a father who struggles to come to terms with his son's homosexuality.
Bratt claims he signed a contract with the movie's distribution company, Screen Media Ventures, which would give him and production company 5 Stick Films two bonus payments if the picture did well at the box office.
The movie earned more than $1 million (£666,667) following its release in May (10), but Bratt claims the first payment of $200,000 (£133,333) was late and the company has yet to hand over the second installment of the same amount.
He has now filed a lawsuit at Los Angeles Superior Court in a bid to recoup the cash.
Joseph Kovacs, president of Screen Media, tells Reuters, "There's a disagreement on the guidelines on how to interpret when the film reached certain results."