Invoice vs Quotation: What’s the Difference?
Invoices and quotations are important business documents with different purposes. Understanding the difference helps you use the right document at the right time and improves client communication.
What is a quotation?
A quotation is an offer to a potential client that outlines the scope of work, prices, and terms. It is typically shared before any work begins, and it allows clients to review and compare services.
Quotations help you set expectations and protect your business by defining the deliverables and pricing in advance.
What is an invoice?
An invoice is a request for payment after goods or services have been delivered. It shows the amount owed, payment due date, and payment instructions.
Invoices are essential for bookkeeping, tax reporting, and ensuring your business receives payment on time.
Key differences between invoices and quotations
Purpose
A quotation is an offer; an invoice is a payment request. Quotes outline potential costs, while invoices confirm what must be paid.
Timing
Quotations are issued before work begins. Invoices are issued after work is complete or during agreed billing milestones.
Content
Quotations focus on proposed services, estimated totals, and validity dates. Invoices focus on actual charges and payment details.
Action required
A quote requires client approval. An invoice requires payment according to the terms listed.
When to use each document
- Use a quotation when you need client approval before starting work.
- Use an invoice after completing work or delivering a product.
- Use a quotation to compare options, proposals, and pricing.
- Use an invoice to request payment and document revenue for accounting.
Practical workflow example
First, generate a quotation to present your service scope and costs. Once the client approves the quotation, carry out the work and then generate an invoice based on the agreed terms.
This two-step process keeps expectations aligned and creates a clean audit trail for billing and payment.
Frequently asked questions
Can a quotation become an invoice?
Yes. When the client accepts the quotation, you can issue an invoice for the agreed-upon services.
Is a quote legally binding?
A quote becomes binding once the client accepts it and both parties agree to the terms.
Should I include taxes in both documents?
Yes. Include tax estimates in quotations and actual tax amounts in invoices to ensure consistency.
Can I update a quotation later?
Yes, if the scope changes, update the quotation and send the revised version to the client.