Translation; "出来混的，迟早要还的" What's a good translation for:


  出来混的, 迟早要还的


What comes around, goes around?
I would say your "What comes around, goes around." is a good translation. Another idiom you can use is "You reap what you sow." The only small drawback with both is that they don't necessarily imply suffering justice/reprisal for criminal activity, as the Chinese phrase does. I say small drawback however, because with context that shouldn't generally be a problem.

A non-idiomatic translation could be: "When you lead a life of crime, sooner or later you have to pay your debts."