Invoice vs bill vs receipt: what is the difference?

"Send me the bill", "have you got the invoice?", "I will email the receipt" — in everyday speech these are interchangeable. In bookkeeping they are not, and confusing them is a common source of messy records and awkward conversations with accountants.

The distinction comes down to two questions: who is asking for payment, and whether money has already changed hands.

The four documents, in order

Quote or estimate

Sent before any work begins. It is a proposal: here is what we will do and what it will cost. It is not a request for payment and carries no obligation. Accepting a quote is what usually turns it into an order.

Proforma invoice

A preliminary invoice shared before the supply happens — often to confirm details, or to support an advance payment or import documentation. It looks like an invoice, but it is not a demand for the final amount and is not the document used for input tax credit.

Invoice (or bill)

The actual request for payment, issued when goods or services are supplied. This is where the invoice/bill split matters, and it is purely a matter of perspective: the seller issues an invoice, the buyer receives a bill. The same document, two directions. If you are on the receiving end of an invoice, you call it a bill.

Receipt

Issued after payment has been made. It confirms that money changed hands. A receipt is proof of payment, not a request for it — which is why a receipt cannot replace an invoice, and an unpaid invoice cannot be treated as a receipt.

A simple way to remember it

• Quote: what it will cost, before anything happens.
• Proforma invoice: a preview of the invoice, before supply.
• Invoice: please pay us. Issued by the seller at the time of supply.
• Bill: the same thing, named from the buyer's side.
• Receipt: thank you, we have been paid.

What GST changes in India

GST adds a layer. For a taxable supply, a registered business issues a tax invoice, which shows the GST rate, the tax amount, and the split between CGST and SGST or a single IGST figure. A tax invoice is the document that lets a registered buyer claim input tax credit.

Where no tax is chargeable — exempt or nil-rated supplies, or a composition-scheme dealer — the document is a bill of supply instead. It must not show a tax amount, and it cannot be used for input tax credit.

Why the distinction matters day to day

Recording a receipt as if it were an invoice makes your records look like you have been paid when you have not. Treating an unpaid invoice as proof of payment does the reverse. Either way, your outstanding balance — the number you most need to trust — stops being accurate.

The fix is not complicated. Use one document per purpose, keep the numbering consistent, and let your software distinguish "sent" from "paid" rather than relying on whether you remember. That separation is exactly what Fintog is built around: an invoice has a status, and a paid invoice is a different thing from a sent one.

Updated 24 October 2026. This article is general guidance from the team building Fintog, not tax, legal or accounting advice.