With respect to an individual who is a resident (determined as provided in subdivision (i) of this subparagraph) of more than one State during a taxable year, see paragraph (e) of this section.
Example. A, a calendar-year taxpayer, is a resident of State X continuously for many years prior to March 15, 1977. On such date, A retires and establishes a new principal place of residence in State Y. A earns $6,000 in 1977 prior to March 15, but receives no taxable income for the remainder of such year. If A had been a resident of State X for the entire taxable year 1977, his liability with respect to the qualified tax of such State (computed after allowing the nonrefundable credits available against the tax) would be $600. If he had been a resident of State Y for the entire taxable year 1977, his liability with respect to the qualified tax on that State (computed similarly) would be $400. Pursuant to the provisions in paragraph (e) of this section, A's liabilities for State qualified taxes for 1977 are as follows:
Liability for State X tax = $600 * 73 / 365 = $120
Liability for State Y Tax = $400 * 292 / 365 = $320.
And it is reasonable to expect him to have it within the State for 30 days or more during the taxable year.
For additional rules relating to withholding see paragraph (d) of § 301.6361-1 .
26 C.F.R. §301.6362-6