How to Make an Invoice Correctly: Required Elements

An invoice is a document the seller sends to the buyer to request payment for goods or services.

Required Elements

• Invoice number — sequential and unique
• Issue date
• Seller details — company name, address, phone, tax ID (if any)
• Buyer details — name, address
• Line items table — product/service, quantity, unit price, line total
• VAT (7% in Thailand) — if VAT-registered
• Discounts (if any)
• Total amount due
• Payment terms — e.g., due within 30 days / bank transfer

VAT Example

Goods total 10,000 THB + 7% VAT:

• VAT = 10,000 × 0.07 = 700 THB
• Total = 10,000 + 700 = 10,700 THB

Tips

• Keep invoice numbers sequential for easy bookkeeping
• State payment terms clearly to avoid late payments
• Keep copies for at least 5 years (tax statute of limitations)
• VAT-registered businesses must issue full tax invoices per law

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