Returns of married individuals.
(a)#
(a) Liability for tax. If husband and wife determine their income tax liability on a separate return under this article, their income tax liabilities under this article shall be separate. If husband and wife determine their income tax liabilities on a joint return under this article, their income tax liabilities shall be joint and several.
(b)#
(b) Different residences. If either husband or wife is a resident and the other is a nonresident, they shall file separate income tax returns under this article, on Form No. PA-40, in which event their income tax liabilities shall be separate unless both elect to determine their joint taxable income as if they were residents. If such election is made, then the income tax liabilities of husband and wife shall be joint and several.