Everhour turns tracked billable work into invoices, while Thailand purchase orders need clean details before VAT invoicing.
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Use a Thailand purchase order to confirm what you want to buy, who supplies it, where it ships, and which commercial terms apply. The document belongs before the invoice in the buying flow. It records approval, budget ownership, supplier details, quantities, prices, delivery terms, and payment expectations so the supplier can fulfill the order without relying on scattered email approvals.
The purchase order does not replace a Thai VAT tax invoice. Thailand uses VAT, and a VAT registrant must issue a tax invoice and copy for every sale of goods or provision of services at the time VAT liability occurs. The purchase order should collect the details that make the later tax invoice easier to issue, including legal names, addresses, taxpayer identification details, line descriptions, values, and agreed currency treatment.
A practical Thailand PO starts with the buyer name, buyer address, supplier name, supplier address, contact person, PO number, PO date, delivery location, and requester or approving manager. Add each item or service on its own line with a clear description, quantity, unit, unit price, discount if agreed, expected delivery date, and the amount before tax.
Tax handling belongs in the PO as a planning field, not as a substitute for the later tax invoice. Thailand's current general VAT rate is 7%, according to the Revenue Department, while VAT registration generally applies once annual turnover exceeds THB 1.8 million. If the supplier is VAT registered, show whether VAT is expected and keep the VAT amount separate from the goods or services value.
The later full Thai VAT tax invoice has stricter content rules than a purchase order. It must show the words "tax invoice," issuer name, address, taxpayer identification number, buyer name and address, serial number, issue date, line-item description, type, category, quantity, value, and VAT amount separated from the value. A PO that captures those details early reduces rework after fulfillment.
Language and currency need attention when a foreign buyer, foreign supplier, or regional office is involved. Thai tax-invoice particulars must be in Thai language, Thai currency, and Thai or Arabic numerals unless the VAT registrant has Revenue Department approval to use a foreign language or currency. If the tax base is expressed in foreign currency, the VAT rules require conversion to Thai baht.
A free PO template is enough when you need a one-off buying record, a simple approval document, or a clean file to send to one supplier. It works well for a small purchase with a single delivery date, fixed quantities, and a straightforward payment agreement. The finished output should be easy to export, attach to email, and store with the supplier quote.
A managed workflow becomes useful when purchase orders turn into billable work, client invoices, and month-end reporting. Everhour Billing & Invoicing converts tracked billable time and expenses into invoices, calculates invoice amounts from rates while excluding non-billable tasks, and supports client settings, taxes, discounts, and payment terms. That workflow keeps approved work, invoice drafts, and accounting export closer together.
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 purchase order does not count as a Thai VAT tax invoice. It records the buyer's request and agreed commercial terms before fulfillment. A VAT registrant must issue the tax invoice at the time VAT liability occurs, and the tax invoice has required particulars such as the issuer's taxpayer identification number, serial number, issue date, line details, and VAT shown separately.
Collect the supplier's legal name, address, taxpayer identification number, and VAT registration status when available. Also collect the buyer name and address that should appear on the later invoice. These fields help the supplier prepare a full VAT tax invoice without correcting entity names, billing addresses, or tax identifiers after goods or services have already been delivered.
Show expected VAT separately when the supplier is VAT registered and VAT applies to the transaction. Thailand's full VAT tax invoice rules require the VAT amount to be separated from the value of goods or services, so the PO should mirror that structure for clarity. The final VAT treatment still belongs on the official tax invoice.
A commercial purchase order can state the agreed foreign currency when the parties choose it, but the later Thai VAT tax invoice has currency rules. Tax-invoice particulars must use Thai currency unless the VAT registrant has approval from the Director-General. Foreign-currency tax bases must be converted to Thai baht under the applicable Revenue Department conversion rule.
Thailand's listed VAT tax-invoice particulars include the issue date but do not list payment terms or a payment due date. Payment terms are normally contractual, so the PO should still state them clearly. Add the due date trigger, deposit rule, bank charges, late-payment policy, and acceptance condition when those terms affect approval or cash planning.
Everhour Billing & Invoicing lets teams select uninvoiced billable time and expenses, preview the invoice breakdown, and generate an invoice without rebuilding timesheets manually. Invoice amounts come from rates, time, and billable expenses, while non-billable work stays excluded from the client-facing total.
Connect approved work, rates, expenses, taxes, and payment terms in Everhour so purchase-backed work can become accurate invoice drafts with accounting export.
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