If you only left to get ur masters, but didnt change anything except where you live, then you're still considered in-state where your parents reside (assuming that you're still under their care). Its like going off to college. I went off to college in Massachusetts, now in Cincinnati for my masters but am still a NJ resident- I havn't registered to vote, changed my plates. To officially change your in-state status you'll have to most likely go to court or city hall and file for in-state residency. If you havn't done that (and assuming that you didnt get married to someone who moved to another state - some states like Ohio would then automatically consider you, or allow you to file for in-state residency immediately if that were the case), then you're still in-stater for your original home state.