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Home › Accounting services › Invoice

Learn more about Invoice

An invoice is a general ledger document that proves a purchase or a sale that your business has operated. An invoice attests to a creditor’s claim against a debtor, in other words, a client’s debt to a supplier. The invoice identifies the creditor (company), the debtor (customer), the amount due, and the date. It commits the debtor to pay the amount by the specified due date. An invoice must be established when selling/buying products or fixed assets or when providing a service. The term “invoice” must appear on the document to identify it as such. We offer an invoice model adapted for your Thai company and a professional accounting assistance with chartered accountants if needed.

Table of contents

What should be mentioned in an invoice?

To be valid, the legal information listed by the tax department must be mentioned. In order to avoid having to re-edit all of these elements for each new invoice created, it is advantageous to use pre-established invoice templates, such as the compliant and easy to edit invoice template we offer.

The document must mention the term “invoice” and a unique number: this is usually an aggregation of the name of the month, the year and an amount corresponding to the invoice.

But several other elements must be mentioned in an invoice, such as payment dates and deadlines, product descriptions and prices, customer contact information, and the supplier’s company.

Can I send an electronic invoice to my client?

The Thai Ministry of Revenue recently issued a ministerial regulation allowing registered VAT filers to collect and send electronic tax invoices and receipts to their customers for the full or partial sale of goods or provision of services. It will no longer be necessary to print these documents and submit them in paper form.

The process for issuing electronic invoices and receipts includes the following steps:

The VAT filer submits an application for approval by the Executive Director of the Department of Revenue. The applicant meets specific eligibility criteria: The customer’s tax identification number and specify the registration number of the branch or headquarters. When authorized by the Director General of the Revenue Department, the applicant must comply with the rules and conditions for the preparation and retention of electronic tax invoices and receipts prescribed in these regulations.

When signing electronically, ensure that the electronic tax invoices and receipts contain two digital signatures created by the means prescribed in these regulations, and a certificate and signature certificate number issued by a certification authority approved by the Revenue Department. Data on electronic tax bills, credit and debit slips and receipts must be transferred to the Thai Revenue Department every month.

This is a big step forward and is part of the Revenue Department’s policy to make taxation more efficient for businesses in Thailand. It is expected to become better known over time as the Revenue Department encourages businesses to follow its program.

How to invoice if your company is registered for VAT?

The tax rate is an important consideration when invoicing your customers as a VAT registered business in Thailand. The point of taxation is the day when VAT is due, and this day varies depending on whether you are selling goods or services. VAT is due on the sale of goods when they are delivered, regardless of the date of payment. In addition, if prepayment is made before delivery, VAT is due upon receipt of payment. VAT is due when the customer pays for the provision of services, regardless of the nature of the service.

1. Regarding the sales of goods in Thailand

VAT is due when your goods are delivered, so you must give a Tax Invoice to your customer. The actual wording could be Invoice/Tax, Invoice/Delivery or similar, as the Tax Invoice is included. You then issue a receipt when your customer pays you for the product.

2. Regarding the services

After providing services, you are supposed to issue an invoice to your customer, but not a tax invoice because VAT is not yet due. VAT is now due when the customer pays you, and you must then issue a tax invoice/receipt.

What are the regulations regarding tax invoices?

Subject to Sections 86-1, 86-2 and 86-8 of the Revenue Code, a VAT taxable person shall immediately issue tax invoices and copies thereof for each sale of goods or services at the time the tax liability arises, and send such tax invoices to the purchaser of goods and services, and retain a copy thereof in accordance with Section 87/3.

Contractors exempt from VAT registration but temporarily registered for VAT pursuant to Section 85-3 may issue tax invoices if they comply with the law, procedure and conditions of the Director General.

The issuance of a tax invoice shall be through the place of business, unless otherwise directed by the General Manager.

The issuance of tax invoices by an agent on behalf of the taxable person shall be in accordance with the law, policy and conditions of the General Manager.

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