California Progress-payment & retention penalty

Enter your invoice, contract, and payment dates. InterestDue applies Cal. Civ. Code §§8800 / 8812 / 8818 to your figures and cites the statute behind every number. It never estimates a rule it hasn’t encoded.

InterestDue is not a law firm and not a collection agency. Figures are computations from your inputs under the cited statute, not legal advice. See our methodology.