What is the legal maximum interest rate a business can charge on past due accounts in California?

In California, the legal maximum interest rate a business can charge on past due accounts is generally 10% per annum, as stipulated by California Civil Code Section 3289. However, if a written agreement specifies a different rate, the contract rate can be enforced, provided it complies with usury laws. Additionally, for certain types of loans and credit, specific regulations may apply, so it's advisable for businesses to consult legal counsel to ensure compliance.