Jon Cryer -- My Ex Is Lying ... I Only Make 3/4 of a Million a Month

Jon Cryer proved his ex-wife was delusional when she claimed he made $2 million a month from "Two and a Half Men." Fact is ... he made way less than half that amount.

Jon submitted legal docs objecting to Sarah Trigger's petition to up her child support from $8,000 to $88,000 a month ... arguing the kid was humiliated at his fancy private school because he couldn't keep up with the Kardashians.

The judge shut Sarah down ... in part because Jon submitted an income declaration showing he earns $758,449 a month -- $600K is from the show, and the rest is from investments and such.

And this is interesting. Jon also listed his expenses. He shells out $7,700 in entertainment, $3,800 in car expenses, $1,000 in groceries, $3,300 for child care and $4,000 for tuition ... and those are MONTHLY expenses. $4 grand a month for tuition ... sheesh.

Now get this ... Jon doesn't eat out a lot. Total monthly expense -- $44.