Title V of the New Hampshire Revised Statutes Annotated is the state of New Hampshire's laws regarding taxation of its citizens on a state level. The laws cannot be more lax than Federal code, and is presumed as de facto at the local level unless more specific, non-conflicting laws are in place.
The New Hampshire Tax Commission was the former tax gathering body of the state, as under RSA 71, but this was repealed and split into RSA 71A: The Board Of Revenue Administration, which was also later repealed/dissolved, and RSA 71B: The Board of Tax and Land Appeals