Invoice vs Quotation: The Difference Explained
A quotation is a fixed-price offer; an invoice is a request for payment. Understand the legal and practical differences.
A quotation is an offer
Unlike an estimate, a quotation is a firm price. Once the client accepts it, most legal systems treat it as part of a contract — you cannot raise the price later without agreement. That precision is exactly why quotations must be written carefully.
An invoice is a demand
The invoice comes afterwards and should mirror the accepted quotation line for line. If the totals differ, explain why on the invoice itself, referencing an approved change request.
Quotation checklist
- Quotation number and date
- Detailed scope and exclusions
- Fixed price with tax treatment stated
- Validity period
- Payment schedule (deposit, milestones, balance)
- Acceptance signature block
Practical workflow
Quotation → written acceptance → deposit invoice → work → final invoice → receipt. Skipping the acceptance step is the single most common cause of scope disputes.
See also: Invoice vs Estimate.
Daniel Okafor
Daniel Okafor writes about invoicing, cash flow and small-business finance for Invoice Creator. Every guide is reviewed against the fields our own invoice generator produces, so the advice matches the tool.
Try the invoice generator