RSA 261:62 Expiration of Registration.

I. The registration of every vehicle registered in the name of a corporation, partnership or other legal entity other than a private individual or private individuals, shall expire at midnight on the last day of the month as designated by the director as the renewal month for said registration, provided that:
(a) If an original registration is issued in one of the next 4 months preceding and including the month in which the registrant's birth is observed, the registration shall expire at midnight on the last day of the month in which the second anniversary of the registrant's birth following the date of issue is observed.
(b) If the owner was born on February 29, in any year in which there is no February 29, the registrant's birth date shall be deemed to be February 28.