Many states will have this information available on a web site. All taxpayers are responsible for keeping tax records. It may just be a little more challenging for a fulltime RVer to find the space. RVers who have a possibility of state taxation as nonresidents or part year residents should keep especially good records detailing time spent in each state. The Internal Revenue Service requires you to keep your tax records for a minimum of three years after the due date of the original return.
Many states add an additional year to that time period.
I would recommend keeping the actual tax return copies, W-2's, and cancelled checks for payment of tax for seven years. They don't take up that much room, and trying to get copies later will be difficult. Conclusion Fulltimers face some interesting tax challenges. The lack of uniformity among states and the fulltimers' lack of a fixed home, may allow states to raise some issues that could be costly to the RVer who is not prepared. Fulltimers with complex income tax issues, especially residency questions may be wise to seek competent professional advice.