Is an invoice a contract? Invoice vs contract differences.

A man in an office uses his computer to look at the difference between an invoice versus a contract.

Discover the differences between an invoice and a contract and when to use each in your business.

Is an invoice a contract? Invoices and contracts are integral elements of any business, so it’s essential to understand the difference between the two. An invoice doesn’t qualify as a contract, nor does a contract serve as an invoice. So which one is your business supposed to use and when? Read on to learn the answer and the differences between invoices versus contracts.

What’s an invoice?

Invoices are professional documents that allow you to request payment from clients in exchange for your services. Depending on the type of business and agreed-upon terms, an invoice can be sent before or after work is completed. Do invoices have to be signed to be legal?


Invoices typically consist of an itemized list describing your services and rates, as well as payment due dates and other pertinent information such as contact details and payment options.

Is an invoice a contract?

An invoice and a contract are not the same thing. An invoice is a request for payment for goods or services that have already been provided. It typically includes details like pricing, quantity, and payment terms. However, it’s a unilateral document sent from the seller to the buyer without mutual negotiation or agreement. Invoices are based on pre-existing contracts or agreements.

What’s a contract?

A contract is simply a legally binding agreement that establishes working expectations between the service provider and the client. When figuring out how to write a contract and what to include, the details can vary greatly, but they often serve as an outline for when goods or services (also known as deliverables) can be expected and how and when payments should be made. Contracts are meant to protect both the provider and the client. If you’re the provider, a contract ensures you receive prompt payment for your work and that client requests don’t veer outside the original scope. If you’re the client, a contract ensures you receive the work within the expected timeline and of the quality expected.

Key differences of a contract vs. invoice.

Let’s break down the key differences between contracts versus invoices:

Sign invoices and contracts with ease.

Make it easier on you and your customers by collecting legally binding digital signatures from nearly any device and from just about anywhere with e-signature software like Adobe Acrobat.

Help speed up your business processes, from creating e-signatures to managing digital documents — explore everything you can do with Acrobat today.