The 31-day period is part of the substantial presence test to determine if someone is a “nonresident alien” for tax purposes. The substantial presence test has 2 prongs. First, if an individual spends at least 31 days in the US, the 2nd prong of the substantial presence test then involves a more complicated 183-day test.
You should seek the advice of a tax expert for more information concerning your parents’ potential tax liability.
Attorney Edward Weiner
E-mail : E.Weiner@immigration-aux-usa.com
Phone : + 1 (617) 889-0215
Internet Site :
http://www.immigration-aux-usa.com