How invoice works
An invoice is created once a product ships or a service is completed, listing each item or service, its price, any taxes, and the total amount due. It also states payment terms, such as due in 30 days, and how the customer can pay, whether by check, card, or bank transfer.
Once sent, an invoice becomes part of accounts receivable and stays open until the customer pays in full. Invoices are tracked individually so a business always knows exactly what is owed, by whom, and how overdue it is, which feeds directly into the aging report and collections process.
Example
A design agency completes a $3,500 project and sends an invoice dated May 1 with payment due June 1. The invoice lists the project name, the $3,500 fee, and the 30 day payment terms. The client pays on May 28, three days before the due date, and the invoice is marked as paid in full.
Invoice in QuickBooks Online vs Xero
QuickBooks Online lets you create and send invoices directly from the platform, with automatic payment reminders and online payment links. Xero offers the same functionality, letting customers pay directly from the invoice email through a connected payment option. Both track each invoice's status, sent, viewed, or paid, automatically.
Common mistakes
- Invoices go out with the wrong payment terms or due date typed in, which confuses the customer and delays payment while the error gets sorted out.
- A business waits days after completing work to send the invoice, pushing back the due date and slowing down cash collection for no real reason.
- Invoice numbers get duplicated or skipped, making it hard to track which invoices are still open and complicating the accounts receivable aging report.
Why it matters
The invoice is the document that actually starts the clock on getting paid, so delays or errors at this stage push out cash collection directly. A business that sends invoices late or with mistakes waits longer for cash it has already earned, which strains the ability to cover payroll, rent or supplier bills. For any business, fast and accurate invoicing is one of the simplest ways to protect cash flow.
Related terms
How LedgerBPO handles invoice
We create and send invoices accurately and on time, using your branding and templates inside your existing software. A dedicated accountant double-checks amounts, terms, and details before anything goes to your customer. You get invoices that go out faster and get paid faster, with fewer errors slowing down the process.