Thailand invoices use baht, VAT status, and service scope. Everhour keeps billable time ready for review.
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A Thailand billable-hours calculation answers how much client-approved time is worth before and after tax adjustments. The inputs are the approved billable hours, the agreed hourly rate in Thai baht, any non-billable time excluded from the invoice, and the supplier's VAT status. Thailand's official currency is the Thai baht, code THB and sign ฿, divided into 100 satang.
The result helps you check an invoice total, quote the value of completed work, compare realization against total hours worked, and identify tax items that should be shown separately. For Thailand, VAT is not automatic for every professional-time invoice. A supplier's registration status, the type of service, and where the service is performed or used all affect the final client amount.
Start with the clean fee calculation: billable hours multiplied by the agreed hourly rate. If a Bangkok advisory project includes 18 approved senior-consultant hours at ฿4,200 per hour and 11 approved analyst hours at ฿2,800 per hour, the pre-tax service value is ฿106,400. That amount is the value received or receivable for the service before VAT.
If 7% VAT applies, VAT is ฿7,448 and the gross invoice total is ฿113,848. If Thailand withholding tax applies to the payment, calculate it separately from the VAT calculation. Thailand's assessable-income codes list service fees, hire-of-work fees, and professional fees at 3% withholding tax when paid to locally incorporated companies or foreign companies with a Thai branch, and 5% for foreign companies without a Thai branch.
Thailand's statutory VAT rate is 10%, but the effective VAT rate is reduced to 7% inclusive of local tax for sales of goods, provision of services, and imports through September 30, 2026. A person or entity that regularly supplies goods or provides services in Thailand is subject to VAT registration once annual turnover exceeds THB 1.8 million, unless an exemption applies.
Do not add 7% VAT just because time was billed. Thailand exempts certain professional services from VAT, including medical services, auditing services, lawyer services in court, and similar regulated professional services. A service is treated as provided in Thailand if it is performed in Thailand regardless of where it is used, or if it is performed abroad and used in Thailand.
Thailand does not appear to prescribe a national billing increment such as 6 or 15 minutes for professional time. Treat rounding, minimum charges, and billing blocks as contract or profession-level settings. If your engagement letter says time is rounded to the nearest 15 minutes, apply that rule before multiplying by the rate. If it says actual time only, bill the approved recorded time.
The common mistake is mixing internal timekeeping with invoiceable time. Training, admin, and correction work can stay useful for utilization reporting while being excluded from the client invoice. Separate approved billable time from total work time before you calculate fees, VAT, or withholding tax. That keeps the invoice tied to the commercial agreement rather than every hour recorded.
A one-off calculation is enough when the job has a short time log, one rate, no disputed entries, and a clear VAT answer. You can total approved billable hours, multiply by the rate, apply VAT when required, and prepare the invoice. For services, VAT timing is generally triggered by the earliest of payment, issuance of a tax invoice, or use of the service.
A managed workflow is better when multiple people, mixed rates, non-billable tasks, VAT review, write-downs, and repeat invoices are involved. Everhour can keep billable and non-billable time separate through project billing status, task-level non-billable controls, custom task rates, member-rate exceptions, and admin reports before billing data moves to the invoice step.
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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Multiply each approved billable-hours line by its agreed hourly rate in THB, then add the line totals. Apply 7% VAT only when the supplier is VAT-registered, the service is not exempt or zero-rated, and the place-of-supply rules put the service within Thai VAT scope. Keep withholding tax separate from the VAT calculation.
The 7% effective VAT rate applies through September 30, 2026 for taxable supplies of goods, services, and imports. For professional services, first check whether the supplier must register for VAT, whether the service is performed in Thailand or used in Thailand, and whether a regulated-service exemption applies.
No. Thailand exempts selected regulated professional services from VAT, including medical services, auditing services, lawyer services in court, and similar regulated professional services. A non-exempt service supplied by a VAT-registered supplier can still fall within Thai VAT rules when it is performed in Thailand or performed abroad and used in Thailand.
Thailand does not appear to prescribe a national billing increment for professional time. Use the engagement agreement, professional policy, or client contract to set the increment. The invoice total changes when you round each entry before totaling, so define whether rounding happens per task, per day, or only on the final timesheet.
Under Thailand's Civil and Commercial Code, if no time for performance is fixed or inferable, the creditor may demand performance immediately. If a calendar due date is fixed, nonpayment on that date creates default without further warning. For monetary debts without another agreed or legal default interest rate, the amended rate is 5% per year.
Everhour supports billable and non-billable time through project billing status, task-level non-billable controls, custom task rates, member-rate exceptions, and admin reports for billable time, non-billable time, billable amount, and cost. That lets admins review what belongs on a Thailand client invoice before tax and payment details are added.
Everhour Billing & Invoicing turns tracked billable time and expenses into client invoices, calculates invoice amounts from rates and time, and excludes non-billable work. Invoice data can be grouped by project, task, person, or date, then exported to QuickBooks Online, Xero, or FreshBooks.
Track billable and non-billable work by project, task, and rate before preparing Thailand invoices. Everhour keeps the billing review tied to approved time and client-ready totals.
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