Invoice vs Receipt: What's the Difference (and When to Send Each)
“Invoice” and “receipt” get used interchangeably all the time — but they’re two different documents that do opposite jobs, and mixing them up makes your bookkeeping (and your client’s) messier than it needs to be. Here’s the difference in plain English, and which one to send when.
The one-sentence difference
An invoice requests payment before it happens. A receipt confirms payment after it happens. Same transaction, two ends of it.
What an invoice is
An invoice is a request for payment you send when the work is done (or a milestone is reached). It says what’s owed, by whom, and by when. Its job is to get you paid, so it carries:
- A unique invoice number and the issue + due dates
- Your details and the client’s details
- Line items with quantities, rates, and totals
- Subtotal, tax, and the amount due
- How to pay (bank details, or a pay-online link)
What a receipt is
A receipt is proof that payment was made. You send it after the money lands. It’s shorter — it confirms what was paid, when, and how — and your client keeps it for their records, expense claims, or taxes.
At a glance
| Invoice | Receipt | |
|---|---|---|
| Purpose | Requests payment | Confirms payment |
| Sent | Before payment | After payment |
| Shows | Amount due, due date | Amount paid, date paid |
| Who needs it | You (to get paid) | The client (as proof) |
When to send each
- Send an invoice as soon as the work or milestone is complete — the sooner the clock starts, the sooner you’re paid.
- Send a receipt once the payment clears, especially if the client asks, pays in cash, or needs it for expenses. For card payments, the gateway usually emails one automatically.
Do you need to send both?
You always send an invoice. A receipt is good practice but not always required — many clients only ask for one when they need to expense the purchase or reconcile their books. When in doubt, send it; it takes seconds and looks professional.
Common mistakes
- Calling an invoice a “receipt” (or vice-versa) — it confuses the client’s accounts payable.
- Reusing numbers across invoices and receipts — keep separate, sequential numbering.
- No proof of payment on file — if a client later disputes, a receipt is your record.
Make both painless
This is the kind of busywork a tool removes. Inkvoice is free, open-source invoicing you actually own: it numbers invoices automatically, tracks exactly what’s paid vs outstanding, and — when you turn on online card payments via Stripe or PayPal — records the payment and the proof for you. Add read receipts to see the moment a client opens an invoice. Self-host it free, or let us host it.