No taxpayer filing either a single or a joint return shall be eligible for a credit under this section:
In the case of a husband and wife who elect to file separate tax returns, each shall, unless otherwise ineligible, be entitled to one-half of the credit allowed.
If a taxpayer who shall have been allowed a credit under the provisions of this section with respect to the purchase of residential property fails to occupy the property as the taxpayer's principal residence within one year after the date of the purchase, or terminates occupation of the property as the taxpayer's principal residence within 10 years after the date of the purchase or the date on which such occupation shall have commenced, whichever is later, the taxpayer shall be liable for tax in an amount equal to the credit previously so allowed.
N.J.S. § 52:27BBB-56