N.H. Code Admin. R. Rev 2407.05
(b) Short period returns shall be completed and filed by the 15th day following the close of the business enterprise's taxable period of:
Source. INTERIM #5708, eff 9-23-93, EXPIRED: 1-21-94; ss by #5774, eff 1-21-94; ss by #7178, eff 12-23-99, EXPIRED: 12-23-07 New. #9065, eff 1-10-08 (from Rev 2407.04); ss by #11032, eff 1-29-16; ss by #12187, eff 5-25-17