What Is an Invoice? Meaning in Accounting, Types of Invoices, What It's Used For and How the Process Works
What an invoice is and what it's used for
In this article
An invoice is a commercial document a seller sends to a buyer requesting payment for goods or services provided. It lists what was sold, quantities, prices, taxes, the total due, payment terms and how to pay. In accounting, an invoice creates an account receivable for the seller (money owed to them) and an account payable for the buyer (money they owe).
What is an invoice used for?
- Requesting payment with clear terms
- Recording sales and purchases in accounting
- Tax compliance (sales tax/VAT/GST records)
- Legal record of the transaction
- Tracking what's paid and outstanding
- Inventory and order matching (with purchase orders and delivery notes)
Invoice meaning in accounting
| Party | Accounting entry |
|---|---|
| Seller | Records revenue and an accounts receivable asset when the invoice is issued (accrual accounting) |
| Buyer | Records an expense/asset and an accounts payable liability |
| On payment | Seller reduces receivables, increases cash; buyer reduces payables, decreases cash |
Businesses often perform three-way matching (purchase order, receipt of goods, invoice) before paying (see Accounts payable automation).
Types of invoices
| Type | Purpose |
|---|---|
| Standard invoice | Normal request for payment |
| Pro forma invoice | Preliminary quote-like invoice before goods are delivered |
| Recurring invoice | Regular billing (subscriptions, retainers) |
| Interim/progress invoice | Partial billing during long projects |
| Final invoice | Completes billing for a project |
| Credit note/memo | Reduces or cancels an invoice |
| Debit note | Increases an amount owed |
| Commercial invoice | International shipping and customs |
| Tax invoice | Includes legally required tax details |
| E-invoice | Structured electronic invoice (required by law in some countries for some transactions) |
| Timesheet invoice | Billing hours worked |
The invoicing process
- Agree price and payment terms (quote/contract/PO)
- Deliver goods or services
- Create the invoice (see What does an invoice look like?)
- Send it (see How to send an invoice)
- Buyer approves and pays
- Seller records payment and issues a receipt if needed (see Invoice vs receipt)
- Follow up on late payments
Common payment terms
| Term | Meaning |
|---|---|
| Due on receipt | Pay immediately |
| Net 7/15/30/60 | Pay within that many days of the invoice date |
| 2/10 Net 30 | 2% discount if paid within 10 days, otherwise due in 30 |
| EOM | Due at end of month |
| CIA/CWO | Cash in advance / cash with order |
| Milestone payments | Paid at project stages |
Invoice automation
Modern businesses automate invoicing: generating invoices from orders, bookings or CRM deals, sending them automatically, collecting online payments, sending reminders, and syncing with accounting. On the buyer side, AI extracts invoice data and routes approvals. (See What are automated financial systems? and What is record to report?)
Frequently asked questions
What is an invoice?
A document a seller sends to a buyer requesting payment for goods or services, listing items, prices, taxes, total due and payment terms.
What is an invoice in accounting?
A source document that records a sale (accounts receivable for the seller) or purchase (accounts payable for the buyer).
What is an invoice used for?
To request payment, record transactions, support tax compliance, provide a legal record and track outstanding payments.
What are the main types of invoices?
Standard, pro forma, recurring, interim, final, credit notes, commercial, tax and electronic invoices.
What does Net 30 mean on an invoice?
Payment is due within 30 days of the invoice date.
Is an invoice legally binding?
An invoice documents a debt arising from an agreement; the underlying contract or accepted order creates the obligation to pay.
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Start a conversationWritten by Sachin Rawat
AI & automation engineer · websites, apps and motion design
I build AI agents, automations, websites, apps and motion design for businesses. These guides answer the questions people actually search, written from hands-on experience building them.
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