Quotation
A written offer to supply something at a stated price and on stated terms, before the customer orders.
A quotation tells a customer what you will supply, at what price, by when, and on what payment terms. It is not a bill: no tax is due on it, and nothing has been sold yet. A business customer usually compares several before placing an order.
Say what is included and what is not, and how long the price holds. Most disputes about extra work start with a quotation that left that out.
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See also: Purchase order (PO), Tax invoice