Receipt vs Invoice: Which Document Is Legally Required?

The Functional Difference

An invoice is a demand for payment. It documents what was supplied, the agreed price, payment terms, and — where applicable — tax charged. An invoice precedes or accompanies delivery but does not confirm that money has changed hands.

A receipt is proof that payment was received. It confirms that the buyer has discharged their financial obligation. A receipt is issued after payment, not before. In a transaction where payment is made at the point of sale — a retail purchase, for example — the invoice and receipt may be combined into a single document. In credit transactions, they are always separate.

Legal Requirements: India

Under the CGST Act, 2017, every registered supplier must issue a tax invoiceat the time of supply. There is no separate statutory requirement to issue a receipt for payment, but one is implied by good accounting practice and is required for the buyer to reconcile their accounts payable.

For B2C (business-to-consumer) transactions, the invoice may be simplified for supplies below ₹200 where the recipient is unregistered. Retailers commonly use a combined bill-cum-receipt for such transactions. The Consumer Protection Act, 2019 entitles consumers to a receipt as evidence of purchase, and most state-level consumer courts have held that withholding a receipt is an unfair trade practice.

Legal Requirements: United Kingdom

In the UK, VAT-registered businesses must issue a VAT invoicefor every taxable supply made to another VAT-registered business, under HMRC's VAT Notice 700. The invoice must include the supplier's VAT registration number, the VAT rate, and the tax amount.

There is no general statutory obligation to provide a receipt for retail sales to consumers — but the Consumer Rights Act 2015 gives buyers the right to evidence of a transaction, which is most commonly satisfied by a receipt. A simplified VAT receipt (showing a total including VAT, the seller's VAT number, and the VAT rate) can substitute for a full VAT invoice for supplies under £250.

Legal Requirements: United States

The US has no federal requirement for businesses to issue invoices or receipts, but the IRS requires businesses to maintain adequate records to substantiate income and deductions (Publication 583). In practice, this means that both parties in a transaction need documentation — invoices for the seller, receipts for the buyer.

State-level sales tax laws vary. Some states require a seller to provide a receipt upon request; others mandate it automatically for any taxable sale. California, New York, and Texas all require retailers to provide receipts for sales subject to sales tax, either printed or electronically.

When Both Documents Are Required

In credit transactions — where goods or services are delivered before payment — both documents are always required:

• The invoice is issued at delivery, establishing the payment obligation and due date.
• The receipt is issued when payment arrives (which may be 30, 60, or 90 days later).

In advance-payment transactions — where a deposit or full payment is taken before delivery — a receipt is issued on payment, and an invoice follows on delivery. This is common in service businesses, construction, and custom manufacturing.

For GST/VAT purposes, a receipt that is not also a valid tax invoice cannot be used by the buyer to claim input tax credit. This means a buyer paying an advance may need both a receipt for the advance and a proper tax invoice when the supply is completed.

Record Retention Periods

The required retention period for invoices and receipts varies by jurisdiction:

• India (GST): 72 months (6 years) from the due date of the annual return for the relevant financial year.
• UK (HMRC): 6 years for VAT records; 5 years after the 31 January submission deadline for self-assessment.
• US (IRS): Generally 3 years from the date the return was filed; 6 years if income was understated by more than 25%.

Digital records satisfy retention requirements in all three jurisdictions, provided they are stored in a format that cannot be altered and are accessible throughout the retention period. A PDF receipt stored in cloud storage meets this requirement.

The Practical Rule

For most businesses, the rule is straightforward: issue an invoice at the time of supply, and issue a receipt when payment is confirmed. In point-of-sale retail, these can be the same document. In B2B transactions on credit terms, they are always separate. The invoice protects the seller (it proves the buyer owes money); the receipt protects the buyer (it proves the debt has been settled).