Key takeaways
- An invoice is issued before payment and a receipt after. Mixing them up is the most common recordkeeping mistake.
- A standard invoice includes an invoice number, dates, seller and buyer details, line items, tax, total and payment terms such as Net 30.
- For your own records, an unpaid invoice proves only that you owed money, not that you paid it.
- The IRS lists invoices alongside receipts as supporting documents for business expenses in Publication 583.
What is an invoice?
When a freelancer finishes a project, a supplier ships materials or a contractor completes a job, they send an invoice. It tells the customer what they’re being charged for, how much and when it’s due. Once the customer pays, the seller may send a receipt, or simply mark the invoice as paid.
If you’re self-employed, you probably send invoices to clients and receive them from vendors. Both sides matter. Invoices you send support your income; invoices you receive and pay support your expenses.
Scan invoices and keep track of what you owe on the go with the Manage Receipt app.
What an invoice includes
- The word “Invoice” and a unique invoice number
- Issue date and due date
- Seller’s business name, address and contact details
- Buyer’s name and address
- Line items: description, quantity, rate and amount for each
- Subtotal, sales tax or VAT, discounts and total due
- Payment terms (for example Net 30) and accepted payment methods
Invoice vs receipt
This is the comparison people search most, and the confusion is understandable. Both documents come from the seller and both list what was bought. The difference is timing and what they prove.
| Invoice | Receipt | Bill | Purchase order | |
|---|---|---|---|---|
| Who issues it | Seller | Seller | Seller (consumer-facing) | Buyer |
| When | After delivery, before payment | After payment | Before payment, often on the spot | Before the order is fulfilled |
| Purpose | Request payment | Confirm payment | Request payment | Authorize a purchase |
| Payment terms | Yes | No | Sometimes | Yes |
| Proves you paid? | No | Yes | No | No |
A purchase order is mostly used by larger businesses. It’s the buyer’s commitment to buy, and later gets matched to the invoice and delivery in a three-way match.
When each is issued
- Purchase orderBuyer sends it to approve the order (optional).
- DeliveryGoods ship or work is completed.
- InvoiceSeller requests payment with terms.
- PaymentBuyer pays by card, transfer or check.
- ReceiptSeller confirms payment, or marks the invoice paid.
At a shop or restaurant, the steps collapse into seconds: you get a bill, pay and get a receipt. In business-to-business work, they can stretch over weeks.
Can a paid invoice be proof of payment?
Yes, with a condition. An invoice on its own only shows that money was owed. It becomes proof of payment when it’s:
- marked “Paid” by the seller, with the payment date and method, or
- matched to a bank or card transaction for the same amount and payee, or
- accompanied by a separate payment confirmation from the seller.
For your records, keep the invoice and the payment record together. That combination shows what you bought, from whom, for how much and that you paid. It’s the same information a receipt gives you.
Invoices you send vs invoices you receive
Small business owners deal with invoices from both sides, and each side needs its own routine.
| Invoices you send (sales) | Invoices you receive (bills) | |
|---|---|---|
| What it supports | Your income | Your expenses and deductions |
| Key habit | Number them in sequence and never reuse a number | Check each line before paying |
| Track | Due dates and late payers | Due dates, so you don’t pay late fees |
| After payment | Mark paid and send a receipt if asked | Keep the invoice with proof of payment |
| Keep for | At least three years after filing | At least three years after filing |
For invoices you receive, a simple workflow prevents most problems: check that the goods or services arrived, confirm the price matches what you agreed, pay by the due date, and file the paid invoice with the payment record. Larger businesses formalize this as accounts payable; for a small team, a shared folder or receipt app is usually enough.
Store invoices next to your receipts
Scan vendor invoices with Manage Receipt just like receipts. The scanner reads the invoice number, vendor, date and total, and you can keep the matching payment confirmation alongside it, so every bill you paid has a complete record when your accountant asks.
Explore AI Receipt ScannerFrequently asked questions
Is an invoice the same as a receipt?
No. An invoice is a request for payment sent before you pay, usually with a due date and terms. A receipt confirms that payment was made. Many businesses issue both: the invoice first, then a receipt or a “paid” invoice once the money arrives.
Can I use an invoice as a receipt?
Only if it shows the invoice was paid. A paid invoice, marked with the payment date and method or matched to a bank or card transaction, can support an expense. An unpaid invoice only shows that you owed money, so it doesn’t prove the expense on its own.
Who issues an invoice?
The seller or service provider issues the invoice to the buyer. A freelancer invoices a client, a supplier invoices a retailer, and a contractor invoices a homeowner. The buyer may issue a purchase order before the work starts, but the invoice always comes from the seller.
What is the difference between an invoice and a bill?
They are very similar. “Invoice” is usually used between businesses and includes formal payment terms. “Bill” is more common for consumers, such as restaurant checks and utility statements. From the payer’s side, an invoice you receive is often called a bill in accounting software.