Last updated: 10 September 2026
Invoices and quotations are both business documents, but they are used at different points in a transaction. A quotation tells the customer the expected price before approval. An invoice records the confirmed sale or work and asks for payment.
This difference matters for small businesses because it affects customer communication, payment follow-up, document numbering and record keeping. Sending the right document at the right time makes your billing process clearer.
Invoice vs quotation at a glance
| Point | Quotation / Quote | Invoice |
|---|---|---|
| When it is used | Before the customer approves the price or scope | After the sale, work or delivery is confirmed |
| Main purpose | Propose pricing and terms | Request or record payment |
| Common fields | Quote number, valid-until date, items, estimated total, terms | Invoice number, invoice date, items, tax, total, payment terms |
| Customer action | Review, negotiate or approve | Pay, confirm payment or keep as record |
| Docarith tool | Create quotation online | Create invoice online |
What is a quotation?
A quotation, quote or estimate is normally sent before the customer confirms the purchase. It describes the proposed products or services, expected price, taxes, discount, terms and how long the offer is valid. A quotation is useful when the customer wants to compare prices or approve the scope before work begins.
What is an invoice?
An invoice is normally issued after goods are supplied, services are completed, work is confirmed or payment is due. It asks the customer to pay a specific amount and usually includes invoice number, invoice date, line items, totals, tax, payment terms and business details.
When should you use a quotation?
Use a quotation when the customer wants to know the expected cost before confirming the purchase. This is common for service jobs, custom orders, repair work, installation, projects, bulk sales or negotiated pricing.
When should you use an invoice?
Use an invoice when the sale is confirmed and payment should be collected or recorded. The invoice becomes part of your business history and can be used for payment follow-up, reporting and customer communication.
Can a quotation become an invoice?
Yes. A quotation can become an invoice after the customer accepts the offer. This is why a good quotation tool should keep the item details, totals and notes easy to reuse. Docarith lets you create a quote and convert it into an invoice after approval.
Example workflow for small businesses
- A customer asks for a service, product bundle or custom price.
- You create a quotation with item details, tax, discount and validity date.
- The customer reviews the quote and confirms the order.
- You convert the accepted quote into an invoice.
- The customer pays based on the invoice and payment terms.
Invoice vs quotation FAQs
Is a quotation a bill?
No. A quotation is normally a proposed price before approval. An invoice is the billing document used when payment is due.
Is a quote the same as a quotation?
In many small business workflows, quote and quotation mean the same pricing document.
Can I send an invoice without sending a quote?
Yes. If the sale is already confirmed, you can create the invoice directly.
Can I create both documents online?
Yes. Use the Docarith quotation generator before approval and the invoice generator after confirmation.
Create a free quotation first, or make a free invoice when the sale is already confirmed. You can also read the quote to invoice workflow.