Can one document be both a receipt and an invoice?

Sometimes. If you pay at the moment of purchase, a merchant may issue a single document marked "paid" that acts as both. In business-to-business sales with terms, though, the invoice and receipt are usually two separate documents issued at different times.

Which one do I need for taxes?

Usually the receipt, because it proves you actually paid. A paid invoice (one stamped or marked paid) can also work as evidence. What the IRS generally wants is proof of the amount, date, and business purpose. This is general information, not tax advice.

Is an invoice proof of purchase?

An unpaid invoice is not proof of purchase; it only shows what was billed. A paid invoice, or an invoice paired with a receipt or bank record showing the payment, is proof. For more, see what counts as proof of purchase.

Do I send an invoice or a receipt to my customer?

You send an invoice to request payment, then a receipt once they pay. If they pay immediately, you can skip straight to a receipt. If you offer terms, the invoice comes first with a due date, and the receipt follows after payment lands.

Receipt vs Invoice: What Is the Difference? (2026)

A receipt proves a payment was made. An invoice requests one. Here is exactly how the two documents differ, when you need each, and why mixing them up causes accounting headaches.

The short answer

An invoice and a receipt are two different documents that sit on opposite ends of the same transaction. An invoice is a request for payment: you send it to say "here is what you owe and when it is due." A receipt is proof of payment: you issue it after the money arrives to say "this has been paid."

The invoice opens the transaction. The receipt closes it. If you remember nothing else, remember the timing: invoice before, receipt after.

What an invoice is

An invoice is a bill. A seller sends it to a buyer to formally request payment for goods or services. It is a key part of accounts receivable for the seller and accounts payable for the buyer, because it tracks money that is owed but not yet paid.

A proper invoice usually includes:

The word Invoice and a unique invoice number
The seller's and buyer's names and contact details
An itemized list of goods or services with quantities and prices
The subtotal, any tax, and the total amount due
Payment terms and a due date (for example, Net 30, meaning due 30 days out)
Accepted payment methods

The defining feature is that an invoice looks forward. It anticipates a payment that has not happened yet.

What a receipt is

A receipt is proof that a payment was made. The seller issues it after receiving money, and it confirms the transaction is settled. If you want the deeper version, see what is an itemized receipt.

A receipt usually includes:

The merchant name and date
What was purchased (ideally itemized)
The amount paid
The payment method (cash, card, last 4 digits)
Sometimes a reference to the invoice number it settles

The defining feature is that a receipt looks backward. It documents a payment that already happened.

Receipt vs invoice at a glance

Feature	Invoice	Receipt
Purpose	Requests payment	Confirms payment
Timing	Before payment	After payment
Shows amount...	Owed	Paid
Has a due date	Yes	No
Unique number	Invoice number	Sometimes references the invoice
Accounting role	Receivable / payable	Proof of settled payment
Answers	"What do I owe?"	"Did I pay?"

When you use each one

As a buyer

If you hire a contractor or order supplies on terms, you get an invoice first. You pay it, and then you should get a receipt (or a paid invoice) confirming the payment. Keep the receipt: that is your proof for expenses and taxes. For what qualifies as evidence, see what counts as proof of purchase.

As a seller

If you offer payment terms, you send an invoice with a due date, then issue a receipt when the customer pays. If the customer pays on the spot, you can skip the separate invoice and just give a receipt, sometimes a single document marked "paid in full" does both jobs.

Tip: When you pay a business invoice, save both the invoice and the payment confirmation. The invoice shows what was billed; the confirmation shows you actually paid it. Together they leave no gaps.

Why the difference matters

Mixing up the two causes real problems:

Cash flow confusion. Treating an unpaid invoice as income (or a paid receipt as still owed) throws off your books.
Rejected expense claims. An unpaid invoice is not proof you spent the money. Reviewers and tax authorities generally want a receipt or a paid invoice.
Double payment. Without a receipt to close out an invoice, you can lose track of what has actually been settled and pay twice.

Good records mean every invoice you pay ends with a receipt, and every receipt you collect can be traced back to the purchase.

The faster way: let Mylo capture both automatically

Keeping invoices and receipts matched by hand is tedious, especially when they arrive as email attachments, PDFs, and card charges scattered across weeks. Mylo pulls them together for you. It scans your Gmail, Outlook, and iCloud inboxes for both receipts and invoices, reads the merchant, date, total, tax, and line items, and matches each one to the card transaction that paid it (via Plaid, using the Visa, Mastercard, or Amex you already have, no new card).

Everything lands categorized and searchable in one place, and approved expenses sync straight to QuickBooks. So the paid invoice and its receipt stay linked, and your records close cleanly. Free for individuals on iOS, Android, and web; teams are $9/user/mo with a 30-day free trial.

Sources: standard accounting definitions of invoices and receipts, and IRS recordkeeping guidance. This is general information, not tax advice.

Receipt vs Invoice: What Is the Difference?