Thailand estimates should collect VAT-ready details before approval. Everhour turns approved billable work into invoices.
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A Thailand estimate helps you confirm scope, pricing, taxes, and payment expectations before the customer approves the work. It is not the same document as a VAT tax invoice, but it should collect the details you will need if approval turns into a sale, service delivery, or billable project.
Use the estimate for proposed services, project work, materials, deposits, and recurring work that still needs buyer acceptance. Include enough detail for the customer to approve without guessing: seller details, buyer details, line items, quantities, unit prices, VAT treatment, validity date, payment terms, and acceptance instructions.
Start with a clear estimate number, issue date, seller name, seller address, and buyer name and address. Add each line item with a description, quantity, unit price, discount if agreed, and line total. A service line can read: "Website support, 10 hours at THB 1,500 per hour," followed by the proposed amount.
Thailand uses value added tax on the supply of goods, provision of services, and imports. A person or entity that regularly supplies goods or provides services in Thailand is subject to VAT when annual turnover exceeds THB 1.8 million. A VAT-registered seller should show VAT treatment clearly on the estimate so the approved tax invoice does not require rework.
The Revenue Department states that the current general VAT rate is 7%, while the Revenue Code sets a 10% rate that may be reduced by Royal Decree. A full Thai VAT tax invoice must show the VAT amount separated from the value of the goods or services. Reflect that structure on the estimate when VAT applies.
Thai tax-invoice particulars must be in 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. If your estimate is prepared in a foreign currency, plan the approved invoice around the required Thai baht conversion rule instead of treating the estimate total as the final tax base.
A free estimate template is enough for a one-off quote, especially when the price, buyer details, VAT treatment, and acceptance terms fit on one document. It works well for a freelancer or small supplier sending a single proposal that later becomes a tax invoice after approval.
A managed workflow becomes necessary when approved work comes from tracked time, expenses, changing rates, and multiple client projects. Everhour Billing & Invoicing converts tracked billable time and expenses into invoices, calculates amounts from rates while excluding non-billable tasks, and keeps invoice status connected after export to QuickBooks Online, Xero, or FreshBooks.
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 Thailand estimate is a proposal document, not the VAT tax invoice a VAT registrant issues when VAT liability occurs. The estimate can show proposed line items, VAT treatment, and payment terms, but the approved sale still needs the required tax-invoice particulars when a VAT tax invoice is required.
Collect the seller's taxpayer identification number, buyer name and address, line-item descriptions, quantities, values, VAT treatment, and the proposed VAT amount when VAT applies. A full Thai VAT tax invoice requires the issuer's tax ID, buyer details, serial number, issue date, line-item detail, and VAT shown separately.
Use Thai baht for the estimate when the approved document will become a Thai VAT tax invoice. Thai tax-invoice particulars must be in Thai language and Thai currency unless the VAT registrant has approval from the Director-General to use a foreign language or currency.
A payment due date is useful on an estimate, but Thailand's statutory VAT tax-invoice particulars list the issue date and do not list payment terms or a due date. Set payment timing by agreement, then carry the agreed term into the invoice or contract paperwork.
Missing buyer details causes avoidable rework. A full Thai VAT tax invoice must include buyer name and address, so the estimate should collect those details before approval. Missing VAT separation also creates problems because a full tax invoice must show the VAT amount separately from the value of goods or services.
Everhour Billing & Invoicing converts tracked billable time and expenses into invoices, calculates invoice amounts from rates and billable expenses, and excludes non-billable work. Invoices can be customized with client settings, taxes, discounts, payment terms, and line-item grouping before export to QuickBooks Online, Xero, or FreshBooks.
Track billable time, expenses, and rates before the estimate becomes invoiceable work. Everhour connects approved work to invoice creation, accounting export, and status visibility.
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