Introduction

Every business runs on getting paid. Whether you design, build, advise, or run a small agency, the moment work is finished one question follows: how do you turn that work into money in your account? Most of the time, the answer is an invoice—a clear document that tells a customer what they owe, for what, and by when.

Invoicing is bigger than a single PDF. It sits in the middle of a longer path: agree on the work, send the bill, collect payment, keep the relationship healthy, and use what you learn to run the business better next time. This introduction gives you that big picture before you dive into detailed guides.