What is a notice of default and when do you send one?

A notice of default serves two purposes. First, it puts the defaulting party on clear, written notice that a specific obligation has not been met — whether that is a missed payment, a failure to deliver work, or a breach of some other contract term. Second, it starts a documented record that the creditor followed a proper process before taking escalating action. Courts and arbitrators regularly look for a notice of default as evidence that the non-defaulting party acted in good faith before pursuing remedies.

For unpaid invoices, a notice of default typically identifies the invoice number, the amount owed, the due date that passed, and a specific deadline to cure the default — often between 5 and 30 days depending on the contract terms. It should also state what will happen if the default is not cured: suspension of services, acceleration of the full balance, referral to collections, or filing in small claims court. The specificity matters because vague threats carry less legal weight than concrete, documented ones.

Not every overdue invoice needs a formal notice of default. For small balances with repeat customers, a phone call is often faster and less damaging to the relationship. The notice of default is most useful for larger balances, one-time clients, and situations where you anticipate needing documentation for legal proceedings. Not legal advice; the specific requirements for a valid notice of default vary by contract and jurisdiction — have an attorney review template language before relying on it.