rules For purposes of this section— (1) Place of abode An individual shall not be treated as having the same principal place of abode of the taxpayer if at any time during the taxable year of the taxpayer the relationship between the individual and the taxpayer is in violation of local law. (2) Married couples must file joint return If the taxpayer is married at the close of the taxable year, the credit shall be allowed under subsection (a) only if the taxpayer and his spouse file a joint return for the taxable year. (3) Marital status An individual legally separated from his spouse under a decree of divorce or of separate maintenance shall not be considered as married. (4) Certain married individuals living apart If— (A) an individual who is married and who files a separate return— (i) maintains as his home a household which constitutes for more than one-half of the taxable year the principal place of abode of a qualifying individual, and (ii) furnishes over half of the cost of maintaining such household during the taxable year, and (B) during the last 6 months of such taxable year such individual’s spouse is not a member of such household, such individual shall not be considered as married. (5) Payments to related individuals No credit shall be allowed under subsection (a) for any amount paid by the taxpayer to an individual— (A) with respect to whom, for the taxable year, a deduction under section 151(c) (relating to deduction for personal exemptions for dependents) is allowable either to the taxpayer or his spouse, or (B) who is a child of the taxpayer (within the meaning of section 152(f)(1)) who has not attained the age of 19 at the close of the taxable year. For purposes of this paragraph, the term taxable year means the taxable year of the taxpayer in which the service is performed. (6) Identifying information required with respect to service provider No credit shall be allowed under subsection (a) for any amount paid to any person unless— (A) the name, address, and taxpayer identification number of such