The 27-year-old NBA star is believed to have filed legal documents demanding his soon-to-be ex-wife reveal how much cash came in during their brief union.
A source told RadarOnline.com: "Kris feels that Kim hasn't given an honest and accurate accounting of money they made while they were married.
"Kris has complied with turning over his bank records, credit card statements, but Kim hasn't, and she has been stalling. Kris didn't want to take her to court over this, but he isn't playing Mr Nice Guy anymore."
'A waste of time'
According to TMZ.com, he is also questioning the reality star's right to keep their wedding presents and donate twice the value to charity without his permission.
In the documents, his lawyer writes: "A spouse may not make a gift of community personal property, or dispose of community personal property for less than fair and reasonable value, without the written consent of the other spouse."
Kris was rumoured to be seeking a £4.3m settlement from Kim in return for his silence. However, a second insider claims he is determined to see the case go to trial.
The source said: "Kris has told his lawyer to no longer attempt to reach a settlement with Kim. It's a waste of time and he is ready to take this to trial, and he will.
"Kris just wants the truth to come out and that is what the courts are for. A judge can decide if the marriage should be annulled on grounds of fraud."