Invoice vs Bill: What Is the Difference?

Key takeaways

• An invoice is the seller's request for payment; a bill is what the buyer owes. In business, they are usually the same document.
• Invoices are formal and itemised, with a number and payment terms; everyday bills are simpler and paid at once.
• After payment, a receipt confirms the money was received.
• Under GST, a tax invoice is issued when tax is charged and a bill of supply when it is not.

The difference between an invoice and a bill is mostly perspective: an invoice is the seller's formal request for payment, and a bill is the amount the buyer owes. In everyday life, a bill is also a simpler demand to pay at once, like a restaurant bill.

Are invoices and bills the same thing? In a business deal, usually yes, so the invoice vs bill question has two answers. First, they are one document seen from two sides. Second, they can be two kinds of document: a formal invoice used for credit sales, and an informal bill used when payment is made on the spot.

Here is the same document from both sides. A Pune design studio finishes a website for a retailer and sends invoice INV-112 for ₹1,18,000, including 18% GST, payable in 30 days. The studio records it as a sale and waits to collect. The retailer receives the same paper, files it as a bill to pay, records it as an expense it owes, and pays by the due date.

An invoice is a document a seller issues to request payment for goods or services supplied. It sets out what was supplied, what it costs, any tax, the total due and when and how to pay.

A proper invoice, and in India a GST tax invoice, usually includes:

• The word 'invoice' and a unique invoice number
• The issue date and the payment due date
• The seller's name, address and GSTIN
• The buyer's name and address, and GSTIN if registered
• A description of each item or service, with quantity, rate and amount
• Tax charged, shown as CGST and SGST or IGST
• The total amount due, the payment terms and bank details

Because it is a formal record, an invoice is never deleted or overwritten. If it is wrong, the seller issues a credit note to reduce it or a debit note to increase it.

A bill is a statement of the amount someone owes for goods or services already received, asking them to pay. It usually shows the seller, the date, what was supplied and the total, and is often settled at once.

Common bills fall into four groups: recurring bills such as electricity, water, phone, internet and rent; one-off bills such as a restaurant meal, a hospital visit or a repair; business purchase bills, which are suppliers' invoices recorded in your books as amounts to pay; and government demands such as a property tax bill.

In accounting software such as Tally or Zoho Books, a supplier's invoice you receive is entered as a purchase bill or vendor bill, so 'bill' is also the buyer's name for an invoice.

Invoices are named by when and why they are raised. The main types are:

Note that 'credit invoice' and 'debit invoice' are not GST terms: in India these are credit notes and debit notes under Section 34 of the CGST Act. A proforma invoice is the one 'invoice' that is not a bill, because it does not ask for payment yet; see our guide to the proforma invoice.

If you send export invoices to overseas clients, Xflow Invoicing is a free tool that adds the currency, client details and export wording for you.

An invoice and a bill both come before payment, and a receipt comes after: the seller sends an invoice, the buyer pays it as a bill, and once payment is made, the seller issues a receipt as proof.

Is an invoice a receipt? No. An invoice marked 'paid' can serve as one, but on its own it shows only that money is owed. A receipt carries the payment date, amount and method, which is why buyers keep it as evidence. Our invoice vs receipt guide covers that pair in detail.

Use an invoice when you have supplied goods or services and the customer will pay later; a simple bill fits when payment is collected at the point of sale.

• Invoice: a freelancer charging a client for a month's work, payable in 30 days
• Invoice: a supplier selling to a distributor on credit
• Invoice: any sale where the buyer needs a GST tax invoice to claim input tax credit
• Bill: a restaurant meal or a repair paid at the counter
• Bill: a monthly electricity or phone statement

Invoice terms in India commonly run from immediate payment to 30, 45 or 60 days. If you buy from a registered micro or small enterprise, the law caps the term at 45 days, so invoices from those suppliers should not carry longer terms.

When the invoice and the bill are the same document, they share one number: the one the seller gave it. A separate bill number usually exists only in the buyer's accounting software, as its own reference for that invoice.

For example, a Mumbai agency issues invoice INV-2045, and the client records it as bill B-8891. For GST, only INV-2045 counts. Each invoice number must be unique for the financial year and up to 16 characters long, so the buyer should always record the supplier's number exactly as printed.

A tax invoice is issued when GST is charged on a sale, and a bill of supply when no GST is charged, such as by a composition taxpayer or on exempt goods and services. Only a tax invoice lets the buyer claim input tax credit.

Both are legal documents, so in India a bill of supply carries as much weight as a tax invoice. Exporters do not issue a bill of supply: exports are zero-rated, so they issue a tax invoice marked for export under LUT. See export of services under GST.