What information must appear on an invoice?

• A. Payment terms only.
• B. The description and totals only.
• C. The seller and buyer details, date, unique invoice number, description, quantities, prices, totals, and payment terms.
• D. The seller's bank details only.

Answer: (D)

To be valid and useful, an invoice must provide enough information to identify who’s involved, what is being charged, and when payment is due. That means including both the seller’s and the buyer’s details, the date, a unique invoice number, a clear description of the goods or services, the quantities and prices for each item, the totals (and any tax details if applicable), and the payment terms. This combination ensures the buyer knows exactly what they’re paying for, who to pay and where to send the payment, when the payment is due, and it gives the seller a reliable record for accounting and auditing.

Options that omit any of these parts fall short. Payment terms alone doesn’t tell who is invoicing or what is being charged. Description and totals without who, when, or a unique reference leave gaps in identification and tracking. Bank details alone don’t provide the essential context of the sale, the items, and the formal invoice reference. The most complete and appropriate choice is the one that covers all the above elements.