N.H. Rev. Stat. Ann. § 72:30

If any entitled person or persons shall own a fractional interest in residential real estate, each such entitled person shall be granted a tax credit in proportion to his or her interest therein with other persons so entitled, but in no case shall the total tax credit exceed the tax credit allowed under RSA 72:28, I or II, or RSA 72:28-b, except as provided in RSA 72:31.