RSA 458-C:7 Modification of Order.

I. (a) The obligor or obligee may apply to the court or, when the department of health and human services has issued a legal order of support pursuant to RSA 161-C, to the department, whichever issued the existing order, for modification of such order 3 years after the entry of the last order for support, without the need to show a substantial change of circumstances. This section shall not prohibit the obligor or obligee from applying at any time for a modification based on substantial change of circumstances.
(b) Not less than once every 3 years the department shall provide notice to the parties subject to a child support order payable through the department informing them of their right to request a review, and, if appropriate, the right to apply for adjustment of the child