What Is an Invoice?
By the BePaid team · Updated · 4 min read
Short answer
An invoice is a document a business sends to a customer to request payment for goods or services it has provided. It lists what was delivered, the amount owed, the due date and how to pay. Once paid, the invoice also serves as a record of the sale for both sides.
What an invoice does
An invoice has two jobs. First, it asks for payment: it tells the client exactly what they owe, by when, and how to pay. Second, it creates a record. You'll use your invoices to track income, see who still owes you, and back up your numbers at tax time. Your client uses them to approve spending and pay the right amount.
In the US, there's no single official invoice format for small businesses. What matters is that the invoice is clear, accurate and consistent. Most businesses include the same core details.
What's on a typical invoice
- The word "Invoice" and a unique invoice number.
- Your business name, address and contact info.
- The client's name and billing address.
- Invoice date and due date.
- Line items: a description, quantity, rate and total for each product or service.
- Subtotal, sales tax (if it applies), discounts or deposits, and the total due.
- Payment terms and accepted payment methods.
For a full checklist, see what to put on an invoice.
Invoice vs. receipt vs. estimate
People often mix these up. The key difference is timing and purpose.
| Document | When it's sent | What it does |
|---|---|---|
| Estimate | Before work starts | Gives an approximate price that may change |
| Quote | Before work starts | Offers a fixed price, usually valid for a set period |
| Invoice | After work is done or goods delivered (or at a milestone) | Requests payment by a due date |
| Receipt | After payment | Confirms payment was received |
Estimates and quotes are not invoices: they don't request payment. If a client accepts one, you send an invoice when it's time to bill. Read more in invoice vs. estimate and invoice vs. quote.
Common types of invoices
- Standard invoice: a one-time bill for completed work or delivered goods.
- Deposit or upfront invoice: requests part of the price before work begins.
- Progress invoice: bills for a portion of a larger project, common in construction.
- Final invoice: bills the remaining balance after deposits or progress payments.
- Credit memo: reduces what a client owes, for example after a return or billing error.
A simple example
INVOICE #1017 Green Leaf Lawn Care → Sarah Patel, 88 Birch Rd, Columbus, OH Invoice date: Sep 30, 2026 Due: Oct 14, 2026 (Net 14) Weekly mowing, September (4 visits × $45) = $180.00 Hedge trimming, Sep 22 = $85.00 Total due: $265.00 Pay by check or bank transfer. Thank you!
When to send an invoice
Send it as soon as the work is done or at the milestone you agreed on. For ongoing work, many businesses invoice on a regular schedule, such as the first of each month. The sooner you invoice, the sooner your payment terms start counting down. If you're setting up billing for the first time, the guide to invoicing for small business walks through the whole process.
Why invoices matter for your records
Invoices help you see which clients have paid, which are unpaid, and which are overdue. Keep a copy of every invoice you send along with notes on when it was paid. Good records make bookkeeping and tax prep far easier. For questions about what records you need to keep, talk to a tax professional.
Create your first invoice
You can draft one in minutes with the free online invoice generator: no signup, and the draft stays saved in your browser on that device. The simple invoice template is a good starting layout. Tradespeople can also look at the invoice generator for cleaners or other industry pages for fields specific to their work. When you're ready for a clean PDF without the preview watermark, the BePaid iPhone app creates it, and your first invoice there is free.
Put this into practice
Create an invoice free on the web, then finish it in the BePaid app.
Frequently asked questions
Is an invoice the same as a bill?
Essentially, yes. The seller calls it an invoice; the buyer often calls it a bill. It's the same document requesting payment.
Is an invoice legally binding?
An invoice on its own usually documents an amount owed under an agreement rather than creating the agreement. The contract, quote or accepted terms are what matter most. For legal questions, talk to an attorney.
What's the difference between an invoice and a receipt?
An invoice asks for payment. A receipt confirms payment was made. You might send a receipt, or mark the invoice as paid, once the client pays.
Do I need an invoice if the client pays upfront?
It's still a good idea. An invoice or receipt documents the sale for your records and the client's.