Interest/Usury

"The annual rate of interest in all business transactions in which interest is paid or secured, unless otherwise agreed upon in writing, is 10%. If agreed upon in writing, interest on business transactions may include charging other than simple interest. Consumer credit transactions are not covered by this provision.

The annual simple rate of interest on judgments, including prejudgment interest, shall be a rate determined by the state treasurer as the prevailing discount rate of interest on 26-week United States Treasury bills determined each year, plus 2 percentage points, rounded to the nearest tenth of a percentage point. N.H. Rev. Stat. Ann. § 336:1

In addition to or in lieu of interest at a periodic percentage rate or rates, a bank may, if the agreement governing the revolving credit plan so provides, charge and collect, as interest specified other charges. N.H. Rev. Stat. Ann. § 384-G:5"