Invoice vs Quotation vs Delivery Challan: When to Use Which

Picture a furniture workshop. A customer asks for six office chairs. The workshop sends a price, the customer agrees, the chairs are delivered on Thursday, and the payment is due in two weeks. That one sale needs three different pieces of paper, and each does something different.

Here's how to think about each one, and what goes wrong when they get blurred together.

Quotation: the offer

A quotation says: this is what I will charge if you buy. It is a price offer, not a demand for payment. It lists items, quantities, rates, any taxes, and a validity period such as valid till 30 November. After that date, prices can change.

Nothing has been sold yet, so a quotation should not reduce your stock or create a receivable. If your records show money owed from a quotation, your books are overstated. Good practice is to number quotations separately from invoices, and to keep the item descriptions identical to what you will later invoice.

A useful habit is to track quotations that were never accepted. If you quoted twenty customers last month and four said yes, that ratio tells you more about your pricing and follow-up than any gut feeling does. Even a rough count in a notebook is better than nothing.

Delivery challan: the movement

A delivery challan says: these goods left my premises, to this person, on this date. It proves movement of goods, and the receiver usually signs a copy. It is common when goods move before the final invoice is ready, when goods go for job work, or when you send items on approval.

The challan carries quantities but price is often optional. The key thing is that the receiver acknowledged receiving it, which settles the later argument of I never got that. When exactly a challan is required, and what it must contain, depends on your type of business and the goods. Check with your CA.

For repeat deliveries, such as a distributor supplying the same shops daily, keep challans in numbered books or in software and match them to invoices at the end of the week or month. Unmatched challans are goods that left without a bill, and that is real money sitting unrecorded.

Invoice: the demand for payment

An invoice says: you bought these goods or services, here is the amount, here is when to pay. It creates a receivable in your books. For tax purposes it is the core document, so it needs the full set of fields. See our GST invoice checklist for what generally goes on it.

How they connect in a real sale

1. 1The customer asks for a price. You send a quotation.
2. 2The customer accepts. You prepare the goods.
3. 3The goods leave. You issue a delivery challan and get a signed copy.
4. 4You raise the invoice, using the same items as the quotation and the challan.
5. 5The customer pays. You mark the invoice as paid, fully or in part.

Not every business needs all three. A counter shop that hands goods over and takes payment on the spot needs only a bill. A wholesaler who delivers to ten shops a day needs challans, then a consolidated invoice at the end of the week. A consultant needs a quotation and an invoice, and no challan.

Whatever you choose, be consistent. Customers notice when one month you send challans and the next you don't, and your own staff stop knowing which paper to trust.

Mistakes we see

• Sending an invoice when you meant a quotation. The customer's accounts team books it as payable, and now you're chasing a cancellation.
• Quoting one price, invoicing another without telling the customer why.
• Skipping the challan and then having no proof of delivery when payment is disputed.
• Creating three documents by retyping. Typos creep in, and the numbers stop matching.

Letting the system carry the data forward

The tidy way to run this is to build each document from the previous one, so the items and prices carry over. Billy has quotations, delivery challans and invoices in the same system, with customers and products shared across them, which is exactly this problem.

Once you're sending invoices regularly, the next problem is getting paid on time, which we look at in following up on unpaid invoices. If your approval flow needs an extra step, such as a manager signing off on quotations above a certain value, ask us about a custom setup.