Canadian Snowbirds Act This bill amends the Immigration and Nationality Act to authorize the Department of Homeland Security (DHS) to admit into the United States as a nonimmigrant visitor for a period not to exceed 240 days during any single 365-day period a Canadian citizen who: (1) is at least 50 years old; (2) maintains a Canadian residence and owns a U.S. residence or has rented U.S. accommodations for the duration of such stay; (3) is not inadmissible or deportable; (4) will not work in the United States other than for a non U.S.-based person or entity that the person worked for in Canada; and (5) will not seek any federal means tested public benefit for five years, or any federal tax credits for child care, earned income, first time homebuyers, health insurance, or health care plans. The spouse of such person may be admitted under the same terms except that he or she is not required to separately satisfy the residence/housing requirements. DHS shall have sole and unreviewable discretion to withhold or withdraw admission of such an alien. The bill grants a person so admitted nonresident alien tax status.