How do state taxes work if I moved to a different state partway through the year?

When you move mid-year, you generally file a part-year resident return in each state, reporting the income you earned while a resident of that state plus any income sourced to it. Most states prorate the standard deduction, exemptions, and credits based on the portion of the year you lived there or your share of total income. Establish a clean move date and keep documentation such as lease or closing papers, utility hookups, and a driver's-license change, because a clear break helps if either state questions your residency. Some income, like a bonus tied to work in your old state, may be taxed there even after you leave. Software handles most part-year returns, but a complex move with equity comp or a home sale may warrant professional help.