Invoice & Billing Guides

An invoice is a seller’s itemized request for payment. See who issues it, what it records and how it connects to quotes, payments and receipts.

A useful invoice identifies the seller and customer, explains each charge, calculates the amount due and tells the customer how and when to pay.

An invoice number is a unique reference for identifying and tracking an invoice. Learn practical numbering patterns and how to avoid duplicates.

The invoice date is the date the document is issued. It can differ from the date work was done and from the payment due date.

An invoice due date tells the customer when payment is expected. Calculate it from the agreed terms and show the date clearly.

Invoice status describes where a bill is in its lifecycle—from draft and sent to partially paid, paid, overdue or cancelled.

Create a clear invoice by identifying both parties, itemizing the agreed work, checking the calculation and adding payment instructions.

Review the invoice, save a copy and deliver it through the channel agreed with your customer. Know what your invoice generator does—and does not—send.

Connect the agreement, work performed, invoice, payment follow-up and receipt so both you and your client can trace the transaction.

Payment terms tell a customer when and how to pay, and how deposits, partial payments or late charges are handled.

An invoice is overdue when its agreed due date has passed and a balance remains unpaid. Verify the records before sending a reminder.

Offer methods that fit your customers and business, then show clear instructions. Availability, timing, fees and cross-border details depend on providers and banks.

An invoice requests payment; a receipt confirms payment received. The two documents appear at different points in a billing workflow.

A quote presents proposed pricing before the customer accepts work. An invoice bills according to the agreed supply or billing schedule.

An estimate projects an expected cost; an invoice states the amount being billed. Use each at the stage it is meant to serve.

A purchase order is typically created by the buyer for a supplier. An invoice is issued by the seller to request payment from the buyer.

A proforma invoice is generally preliminary; an invoice is the seller’s billing document. Their exact treatment depends on the transaction and jurisdiction.

An invoice requests payment. A credit note documents a reduction or correction connected to an invoice or account.

A tax invoice is a tax-related billing document defined by a particular jurisdiction. There is no single format that applies worldwide.

A VAT invoice records billing and VAT details under a particular VAT system. Required fields and rules differ across countries.

A GST invoice records a supply in a goods-and-services tax system. India, Australia, Canada and Singapore each have distinct rules.

Carry an accepted quote into the work, preserve the agreed scope and convert the billing details into an invoice when payment is due.

A timesheet records work time; billable entries can support invoice lines when matched to the agreed rate and client billing terms.

An invoice requests payment. After money is received, match it to the invoice and create a receipt or confirmation for the amount actually paid.