“Usury is determined at a state level, so calculations can vary. Since the federal government is not involved, every state has the ability to set their own usury amount. A majority of states have usury rates around 10%, although exemptions, fine print, and other issues may effectively negate this rate.
The methods used to calculate usury will vary as well. Some states have a legal limit that is set, while others use a yearly or quarterly calculation. As usury is meant to reduce predatory lending practices, a set rate is to provide a guideline for lenders.