Can an email change a signed business contract?

You signed a contract to supply 500 items for a set price. Later, the customer requests 100 more, and you discuss a higher total through email. You deliver the extra items, but the customer pays only the original price, which disrupts your cash flow. Under New Jersey law, that email exchange may change your contract if both businesses agreed to the revised terms.

When emails show intent

A contract modification means you and the other business agree to change a deal you already signed. New Jersey recognizes electronic records and signatures when both sides agree to handle a transaction that way, even if neither business prints a new contract. However, your original contract might require a written update with signatures from both businesses.

If you face that requirement, the wording and purpose of each email matter. A typed name at the end of a message could qualify as an electronic signature if its sender intended to sign the record. An automatic email footer raises a closer issue about whether its sender meant to approve the new terms.

When the replies indicate agreement

Your customer’s reply helps show whether you both accepted the new price. A response stating “We agree to the higher total” supports agreement on the same terms. A message asking for a discount could show that your talks were still open.

Your actions after the exchange add context. You shipped the extra items, and the customer accepted them. That conduct may support the deal you described in your emails, especially if an invoice matched the revised price.

The person who answered also matters. If a purchasing manager approved the new amount, that role might support their authority to speak for the business. The company’s prior dealings with you offer another way to assess whether the reply carried approval.

Preserve the full exchange

You have a practical reason to examine the contract and the whole chain before you dispute the payment. You may want to retain the messages, invoices and delivery records together so you can trace exactly what each side agreed to. Those details help you assess whether a commercial claim over the unpaid amount has support.