Invoices and quotations are both common business documents, but they are used at different stages of a transaction. A quotation normally comes first: it tells a customer what you propose to supply, the expected price, and the commercial terms. An invoice usually comes later, when payment is due for goods or services that have been supplied, completed, or formally agreed.
Invoice vs quotation at a glance
| Document | Main purpose | Typical timing |
|---|---|---|
| Quotation | Propose pricing, scope and terms | Before the customer accepts the work or order |
| Invoice | Request payment | After goods/services are supplied or payment becomes due |
If you need to prepare either document quickly, use the Tooloos Quotation Generator or the Tooloos Invoice Generator.
What is a quotation?
A quotation is a commercial proposal. It usually describes the products or services being offered, quantity, rates, taxes where relevant, validity, payment terms and other conditions. Its purpose is to help the customer understand the expected cost before deciding whether to proceed.
A professional quotation should make the offer easy to evaluate. Clear line items, a validity date and payment terms reduce the chance of confusion later. If you need those fields, the Quotation Generator with Payment Terms provides a focused workflow.
What is an invoice?
An invoice is a billing document. It identifies the seller and customer, lists the products or services being charged, shows taxes or discounts where applicable, states the total amount due, and usually includes a payment due date or payment instructions.
Unlike a quotation, an invoice is generally associated with an amount that is actually payable. The exact legal and tax requirements depend on the country and transaction, so a business should verify the fields required for its own situation.
A simple example
Suppose a design agency is asked to create a website for a client. Before work begins, the agency can issue a quotation showing the project scope, price, tax, payment schedule and validity period. The customer reviews and accepts the offer. Once the agreed billing milestone is reached, the agency can issue an invoice using the confirmed project details and request payment.
Tooloos includes a quotation-to-invoice workflow so the main details can be carried forward instead of entered again from scratch.
What should a quotation include?
- Business and customer details
- Quotation number and issue date
- Description of products or services
- Quantity, rate and proposed total
- Tax and discount information where relevant
- Validity period
- Payment terms
- Scope notes or commercial conditions
What should an invoice include?
- Seller and customer details
- Invoice number and issue date
- Due date where applicable
- Products or services supplied
- Quantity, rate and line totals
- Applicable tax, discount or shipping
- Total amount due
- Payment information and notes
Can a quotation become an invoice?
Yes, operationally the accepted quotation can be used as the starting point for the invoice. However, the invoice is a separate document with its own invoice number, issue date, payment status and any final billing adjustments. Do not simply relabel an old quotation without checking the final quantities, dates, taxes and totals.
Quotation vs proforma invoice
A proforma invoice is another pre-sale document. It can look more like an invoice than a quotation, but it is generally used before the final commercial invoice. Businesses may use quotations for proposals and proforma invoices for more formal pre-billing documentation. Tooloos provides a separate Proforma Invoice Generator for that workflow.
For Indian GST workflows
If your transaction is in India, you can start from the dedicated GST Quotation Generator for India and GST Invoice Generator for India. These pages start with India-focused currency and GST terminology, but you should still verify the tax treatment and required document fields for your specific transaction.
Frequently asked questions
Is a quotation a bill?
No. A quotation normally proposes a price before the customer accepts the transaction. An invoice is the document typically used to request payment.
Do I need both a quotation and an invoice?
Not every transaction requires both, but using a quotation before the sale and an invoice when payment is due can make the process clearer for both parties.
Should quotation and invoice numbers be the same?
Usually they are managed as separate document series because they represent different document types. Use a numbering system that fits your own records and accounting process.