Thailand VAT invoices need specific tax fields and Thai baht amounts. Everhour keeps billable work tied to rates before invoicing.
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Use this page to prepare a client invoice for work billed in Thailand, especially when the seller is VAT-registered. Thailand uses VAT on goods, services, and imports, and VAT registration generally applies once annual turnover exceeds THB 1.8 million. A VAT registrant must issue a tax invoice at the time VAT liability occurs, give it to the customer, and keep a copy.
The finished invoice should identify the seller, buyer, invoice number, issue date, service details, value before VAT, VAT amount, and total amount due. For Thai VAT tax invoices, the Revenue Department lists the issuer's taxpayer identification number as a required field. Payment terms still matter for collection, even though Thailand's listed VAT tax-invoice particulars include the issue date rather than a required due-date field.
A full Thai VAT tax invoice must show the words "tax invoice," the issuer's name, address, and tax ID, the buyer's name and address, a serial number, the issue date, and a description, type, category, quantity, and value of the goods or services. The VAT amount must appear separately from the value of the goods or services.
The current general VAT rate stated by the Revenue Department is 7%, while the Revenue Code sets a 10% rate that may be reduced by Royal Decree. For a service line such as "Website maintenance, March retainer, THB 40,000," the invoice should show the taxable value, the separate VAT amount, and the total in Thai baht so the buyer can process the document without rebuilding the tax line.
Thai VAT tax-invoice particulars must use Thai language, Thai currency, and Thai or Arabic numerals unless the VAT registrant has approval from the Director-General to use a foreign language or currency. That rule affects invoices sent to international clients from a Thai VAT-registered seller, because a polished English document alone may fail the local tax-invoice format expectation.
Foreign-currency amounts need a Thai baht conversion for the VAT tax base. The rule uses Thai money received if the foreign currency is sold in the same tax-liability month. Otherwise, it uses the Bank of Thailand average selling rate on the last working day of that month. Imports use the Customs Department rate. Keep the conversion source with the invoice file.
A one-off invoice is enough when you have a single project, a settled price, and a clear VAT treatment. It works for simple service delivery where the client already agreed to the scope, currency, payment timing, and supporting detail. The risk rises when the invoice depends on changing people, rates, tasks, expenses, or multiple project phases.
Everhour fits the managed workflow after the invoice stops being a standalone document. It separates internal cost rates from client-facing billable rates, supports default per-person rates and per-project overrides, and preserves dated rate changes so older work keeps its original pricing. That structure helps teams turn approved billable time into invoice-ready amounts without re-entering rate logic each billing cycle.
This content is for general information only, may not be fully up to date, and is provided without any warranty or liability.
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A Thai VAT tax invoice is required for a VAT registrant when VAT liability occurs on a sale of goods or provision of services. VAT registration generally applies when annual turnover exceeds THB 1.8 million for a person or entity that regularly supplies goods or provides services in Thailand. Non-registered sellers still need commercial invoices, but they should not present them as VAT tax invoices.
The issuer's taxpayer identification number belongs on a Thai VAT tax invoice. The Revenue Department's tax-identification rules require taxpayers or income payers to obtain and use a taxpayer identification number unless an individual may use a personal identification number instead. Put the identifier with the issuer's name and address so the buyer can match the invoice to the seller.
A full Thai VAT tax invoice must separate the VAT amount from the value of the goods or services. A single tax-inclusive total makes the buyer calculate the tax split, which creates avoidable processing delays. Show the value before VAT, the VAT amount, and the total amount due as distinct figures.
Payment terms should appear when the buyer needs a due date, bank details, or a late-payment rule, but Thailand's statutory VAT tax-invoice particulars do not list payment terms or a due date as required tax-invoice fields. Treat payment timing as a contract or commercial term, then keep it clear on the invoice for collection.
Thai VAT tax-invoice particulars must use Thai currency unless the VAT registrant has approval from the Director-General to use a foreign currency. If the VAT tax base starts in a foreign currency, convert it to Thai baht using the applicable Revenue Department rule, then keep the exchange-rate support with the invoice record.
Everhour separates cost rates from client-facing billable rates, then lets teams set default per-person rates and per-project overrides. Dated rate changes preserve historical pricing, so a January rate change does not rewrite December billable work when a Thailand client invoice is prepared later.
Everhour Billing & Invoicing turns tracked billable time and expenses into client invoices, with amounts calculated from rates, time, and billable expenses while non-billable work stays excluded. Invoice data can be grouped by project, task, person, date, or another available breakdown before export to accounting.
Use Everhour to keep rates, approved time, and billable amounts connected before each invoice cycle, so Thailand client billing starts from clean, priced work records.
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