GlossaryLive
What is an invoice (ใบแจ้งหนี้)?
An invoice is a commercial document a seller issues to a buyer requesting payment for goods or services already delivered. It lists items, quantity, price, total, and payment terms such as the due date. An invoice is not a legal tax document, so it does not need a tax ID or separated VAT like a tax invoice. Thai B2B businesses commonly follow the sequence quotation → invoice → billing note → receipt/tax invoice, with invoices typically used for one-off sales or smaller amounts.
Thai SME owners and Thai accountantsLast updated 2026-07-21
Lists items or services, quantity, price, total, and payment terms
Sits in the sequence quotation → invoice → billing note → receipt/tax invoice for Thai B2B work
Often used interchangeably with a billing note for small businesses billing per transaction
MooMooNext helps store and match invoices against payments for easier review
What is the difference between an invoice and a billing note?
An invoice is typically issued for a single sale or smaller amount, while a billing note bundles several items or delivery notes into one amount for a billing cycle. Both request payment, but they differ in usage pattern and item volume.
Does an invoice need to show VAT separately?
An invoice itself is not a legal tax document, so separating VAT is not mandatory. Sellers often show an estimated VAT-inclusive total and issue the actual tax invoice once payment is received.
Can an invoice be used instead of a tax invoice?
No. An invoice is a payment request, while a tax invoice is a legal VAT document under Section 86/4 that VAT-registered sellers must issue separately for each sale.
What should I do if a customer does not pay an invoice on time?
An invoice is a commercial document, so it does not dictate a legal collection method for tax. What you can do is state the due date and payment terms clearly on the invoice, follow up on outstanding balances each cycle, and issue a billing note when the collection period arrives. For VAT-registered sellers, the timing of the tax invoice follows the law — check with the Revenue Department (rd.go.th).
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What is a tax invoice (ใบกำกับภาษี)?
A tax invoice is a legally required VAT document every VAT-registered seller must issue for each sale, per Section 86/4.
Read moreLiveWhat is a billing note (ใบวางบิล)?
A billing note bundles several invoices or delivery notes into one amount, collected on an agreed billing cycle.
Read moreLiveWhat is a quotation (ใบเสนอราคา)?
A quotation offers prices for goods or services before a sale is agreed, listing items, price, terms, and validity period.
Read moreLiveWhat is VAT?
VAT is value-added tax that needs reviewable input and output tax separation.
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Extract vendor, date, amount, VAT, and tax fields from Thai documents for accountant review.
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