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California courts have consistently upheld service charges, also known as delinquency charges, late fees, and finance charges, provisions as high as 18% per annum (or 1.5% per month) when the creditor could show that non-payment by the customer created administrative costs for the creditor.
Thus, you should be able to add a provision on your invoices that says all unpaid amounts after 30 days are subject to a service charge of ____%. That will give you the ability to charge the fee.
As for collecting, if your boss won't turn accounts over to a collection agency or to a lawyer to sue, you're really out of options except to wait and see if the customers will pay.