Three words people use interchangeably that mean very different things. Get them wrong on a customer email and nobody notices. Get them wrong in an audit and you've got a problem.
Here's the short version: an invoice is a request for payment. A receipt is proof that payment happened. A bill is what your customer calls your invoice when they're the one paying it.
What an invoice does
An invoice is a forward-looking document. You did some work, or you're about to ship something, and you want to be paid. The invoice spells out: what was provided, what it costs, when payment is due, and how to pay you.
Invoices typically include a unique invoice number, an issue date, a due date, line items, totals, and your tax ID if your jurisdiction requires it. The whole document is making an ask. Until your client pays, the invoice represents money you're owed — what accountants call "accounts receivable."
What a receipt does
A receipt looks backward. The transaction already happened. The receipt just confirms it. It usually shows: what was bought, the amount paid, the payment method, and the date.
That's why you get a receipt at a coffee shop and an invoice from a contractor. The coffee is paid for the moment you swipe your card — no need to track who owes what. The contractor's work might be paid weeks later, so they send an invoice first.
Restaurants confuse this because they send the "bill" at the end of dinner, you pay, and then you get the receipt. The bill is acting as an informal invoice, payment is immediate, and the receipt confirms it.
When you need to issue both
For most B2B work, you send an invoice, the client pays it 30 days later, and that's it. No separate receipt needed — your bank statement and the marked-paid invoice prove the transaction.
But there are situations where you should send both:
- The customer asks for a separate receipt for their records.
- The payment was unusual (cash, large amount, foreign wire).
- Your country's tax authority specifically requires a paid receipt (some EU countries do for VAT-exempt purchases).
- The transaction was prepaid before the work — the receipt acknowledges the deposit; the invoice goes out later.
The IRS / HMRC angle
For audits, tax authorities want to see evidence of two things: that you reported the income you actually received, and that the expenses you deducted actually happened. Invoices and receipts both contribute, but differently.
Income side: your invoices show what you billed. Bank deposits show what you collected. The match between them is what gets audited.
Expense side: receipts are the primary proof. An invoice without a receipt is just "something I owed at some point." The receipt — or a bank statement showing payment — is what makes it a deductible expense.
This is why bookkeepers nag you about keeping receipts. The invoice tells the story; the receipt closes the loop.
Receipts you can issue from this tool
Strictly speaking, this is an invoice generator, not a receipt generator. But if you need a paid receipt, here's the trick: create the invoice as normal, enter the same amount in the Amount Paid field as the total. The balance due becomes zero. Download the PDF. Email it titled "Receipt — INV-0042".
It's the same document with an explicit zero balance. Tax authorities accept this everywhere I've seen.
Quick reference
| Document | Purpose | When |
|---|---|---|
| Invoice | Asks for payment | Sent before payment |
| Receipt | Confirms payment | After payment |
| Bill | Informal term — same as invoice | From customer's side |