小心報應, is accurate translation. :) "What goes around, comes around", often said as an advice before hand. 自作自受 has after-the-fact connotations. 「不是不報﹐時候未到。」also fits, depends on the situations.
Heheh.... NS is so inquisitive. :) First time encounter for LKK, just like to get to know your blog better, so went back to read your early articles. You have a lively, lovely, and fluent writing style, cheerful, sometimes insightful, as well, worthwhile stopping by often. Nice meeting you here.
Are you located in the midwest? I travel among US, Taiwan, and China often, primarily stay in Southern California.