What is the main difference between a quotation and an invoice?

A quotation shows the proposed price and terms before a transaction is confirmed. An invoice records the actual supply and requests payment.

Is a quotation the same as an estimate?

They can be similar, but a quotation is generally presented as a more specific offer based on defined scope and terms. The exact legal effect depends on the wording and circumstances.

Can an invoice be issued before payment?

Yes. Invoices are commonly issued before payment to tell the customer how much is due and when it must be paid.

Can an invoice be different from the quotation?

Yes, but any material difference should reflect changes that were agreed with the customer, such as additional work, revised quantity, or changed specifications.

Should quotations have an expiry date?

Yes, where pricing, availability, freight, or input costs can change. A validity period makes it clear how long the offer remains open.

Do international quotations and invoices need a currency?

Yes. The currency should always be stated explicitly to avoid ambiguity in cross-border transactions.

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Quotation vs Invoice: Key Differences & When to Use Each

What is a quotation?

A quotation, or quote, is a document a seller gives a potential buyer before the transaction is confirmed.

It normally explains:

what will be supplied
quantity or scope
price
taxes where relevant
delivery timeline
payment terms
validity period
important conditions

What is an invoice?

An invoice is a formal commercial document issued for goods or services supplied, showing the amount payable by the buyer.

A typical invoice includes:

invoice number
issue date
seller details
buyer details
description of goods or services
quantity
price
applicable taxes
total amount due
payment terms
due date
payment details

For GST-registered businesses in India, tax invoices must contain prescribed GST particulars.

The invoice therefore plays a different role from the quotation: it moves the transaction from proposed price to payment due.

Quotation vs invoice: what is the difference?

Quotation	Invoice
Sent before the transaction is confirmed	Issued for the actual supply
Shows proposed pricing and terms	Shows the amount payable
Helps the buyer decide whether to proceed	Requests payment
Can be revised during negotiation	Should reflect the final transaction
Usually includes a validity period	Usually includes a payment due date
Does not normally form part of accounting revenue records by itself	Forms part of the business's financial and tax records
May become contractually important once accepted	Supports collection and proof of the transaction

The simplest way to remember it is:

Quotation = What it will cost
Invoice = What you now owe

When should you use a quotation?

Use a quotation when the buyer needs to approve the commercial terms before committing.

This is common when:

pricing varies by customer
the project scope needs approval
the buyer wants several options
quantity or specifications may change
advance payment is required
the seller wants the price to remain valid only for a certain period

A quotation should be specific enough that the buyer knows exactly what they are accepting.

What should a quotation include?

A useful quotation normally contains:

quotation number
date
validity period
seller and buyer details
product or service description
quantity or scope
unit price
discounts
taxes where relevant
total estimated value
payment terms
delivery or completion timeline
important conditions

What should an invoice include?

An invoice should reflect the actual transaction, not simply copy an old quotation without checking it.

Confirm:

final quantity
final price
discounts
taxes
amount already paid
balance due
currency
payment deadline
payment details

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Does accepting a quotation make it legally binding?

Potentially.

A quotation is not automatically meaningless until an invoice is issued.

Depending on its wording, acceptance, surrounding communications, and applicable law, an accepted quotation can form or contribute to a contract. Government business guidance in Australia, for example, notes that an accepted quote can become legally binding.

Businesses should therefore make the scope, validity, payment terms, and important conditions clear. For material transactions, a separate contract may still be appropriate.

Can a quotation be changed after the client accepts it?

Only with agreement.

If the scope changes, issue a revised quotation, change order, or other written confirmation before doing additional work.

Document agreed changes before invoicing so the customer is not surprised by a higher final amount.

What happens after a quotation is accepted?

A typical workflow looks like:

Customer enquiry → Quotation → Customer acceptance → Purchase order or agreement → Delivery → Invoice → Payment → Reconciliation

The quotation supports the sales decision, while the invoice supports the payment and accounting process.

Quotation vs proforma invoice

A quotation usually communicates an offer and price. A proforma invoice presents the proposed transaction in a format closer to a final invoice and is often used for international orders, advance payments, or buyer approval.

How should businesses handle quotations and invoices for international clients?

For overseas customers, both documents should clearly state:

buyer and seller
currency
amount
payment terms
payment method
relevant transaction reference

For goods exports, trade terms and shipping details may also matter.

PayGlocal helps Indian businesses collect international payments and maintain clearer transaction and settlement records, making it easier to reconcile overseas invoices with the payments behind them.

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