Legal Question in Business Law in California

Unless the contract contains some language making punctual payment absolutely necessary, modern courts will not consider a contract to be breached when a payment is a few days late. Look for a clause that says "Time is of the essence of this agreement" or words to that effect. Paying bills a little late is commonplace in the business world. Some contracts contain "late fees" for failure to pay on time, like residential leases and credit cards, but these are unusual in ordinary commercial agreements. I'd say if you are getting paid ONLY a couple of days late you are pretty lucky. Some of my clients are considerably less prompt!