Money is a big motivator… and Post Malone is going to save a ton of money by duking it out with his ex in a Utah court instead of a California court as they fight over child custody and support … and it’s all because of timing.

Here’s the deal … Post Malone’s ex-fiancée Hee Sung “Jamie” Park filed custody documents in Los Angeles earlier this week, but Post had already filed his own custody documents in Utah … and we’ve learned that’s where the case will be handled.

That’s good news for Post Malone’s finances and bad news for Park … because California allows for higher payments when it comes to child support.

We’re told Park moved to California at the beginning of the year — things ended with Post toward the end of 2024 — to try to obtain residency in an effort to establish the custody battle in Cali … for financial reasons.

But, our sources say Park is going to strike out here despite swinging for the fences and filing for full custody in California … because the case is staying in Utah.