How to pay a US company legally from Thailand
Quick answer
Paying a US company from Thailand for services typically incurs 0% withholding tax under the US-Thailand tax treaty. The Bank of Thailand (BOT) oversees foreign exchange transactions, with outward remittances generally permitted up to USD 1 million per person per year without extensive documentation. The primary method for sending payments is via USD wire transfers through commercial banks.
The regulatory environment
The Bank of Thailand (BOT) is the central bank responsible for supervising foreign exchange transactions and maintaining exchange rate stability. The BOT implements exchange control regulations to manage capital flows and prevent capital outflows, though these regulations have seen some relaxation over time to facilitate cross-border transactions.
For outward remittances, the BOT generally allows transfers up to USD 1 million per person per year for various purposes, including payments for goods and services, without requiring extensive prior approval. However, transactions exceeding this threshold or those deemed unusual may trigger stricter documentary verification requirements. Commercial banks act as authorized agents for the BOT in processing these foreign exchange transactions, and they are responsible for ensuring compliance with the prevailing regulations. Businesses and individuals making payments to US entities must be prepared to provide supporting documentation, such as invoices, contracts, or other evidence of the underlying transaction, to their commercial bank.
US tax treaty status
A comprehensive US-Thailand tax treaty is in effect, which aims to prevent double taxation and facilitate economic relations between the two countries. Under this treaty, the withholding tax (WHT) rates for various types of income paid from Thailand to US residents are specified. For dividends, the WHT rate is generally 15%. For interest and royalties, the WHT rate is also typically 15%. Crucially, for services rendered, arm's-length payments are generally subject to 0% WHT under the treaty, provided certain conditions are met (e.g., the US company does not have a permanent establishment in Thailand). This is a significant advantage for Thai companies paying US service providers, as it avoids the default 30% WHT that would otherwise apply in the absence of a treaty.
How to actually send the payment
Sending payments to US companies from Thailand primarily involves initiating a USD wire transfer through a commercial bank. Most major Thai banks, such as Bangkok Bank, Kasikornbank, Siam Commercial Bank (SCB), and Krungthai Bank, offer international wire transfer services. To initiate a transfer, you will typically need the following information from the US recipient:
- Beneficiary Bank Name and Address
- Beneficiary Bank SWIFT/BIC Code
- Beneficiary Account Number
- Beneficiary Name and Address
For payments, especially those for services, banks will require supporting documentation to comply with BOT regulations and anti-money laundering (AML) guidelines. This usually includes a commercial invoice, a service agreement or contract, and potentially a tax residency certificate from the US entity to claim treaty benefits (0% WHT on services). While the general limit for outward remittances is USD 1 million per person per year, banks may have their own internal thresholds for requiring additional scrutiny or documentation. Timelines for international wire transfers typically range from 1 to 5 business days, with fees varying by bank and transfer amount, usually a flat fee plus a percentage of the transaction.
Fintech platforms like Wise (formerly TransferWise) and Payoneer are also viable options for sending payments to US companies from Thailand. These platforms often offer more competitive exchange rates and lower fees compared to traditional banks, especially for smaller to medium-sized transactions. They also provide a more streamlined online process, though they will still require documentation for compliance purposes. Wise, for instance, allows transfers in THB to be converted and sent as USD to US bank accounts, often with transparent fees and faster processing times.
For a detailed comparison, see our full Payoneer vs Wise comparison.
Common mistakes and how to avoid them
- Incorrect documentation for WHT exemption: Many Thai companies fail to provide adequate documentation (e.g., tax residency certificate from the US entity) to their bank, leading to the bank applying a default WHT rate on service payments, even when the treaty allows for 0%. Fix: Always obtain and submit a valid tax residency certificate from the US company to your Thai bank when claiming treaty benefits.
- Underestimating bank compliance requirements: Assuming all outward payments are straightforward can lead to delays. Banks are strict about BOT regulations. Fix: Proactively prepare all supporting documents (invoices, contracts, proof of service) before initiating the transfer, especially for larger amounts.
- Ignoring FX rate fluctuations: Initiating transfers without considering the real-time exchange rate can result in higher costs. Fix: Monitor THB/USD exchange rates and consider using fintech platforms that offer transparent rates and allow you to lock in a rate for a period.
- Lack of clarity on payment purpose: Vague descriptions of the payment purpose can raise red flags with banks. Fix: Ensure the payment description on the transfer instruction clearly matches the invoice or contract details.
Edge cases
- Paying a US LLC vs. C-Corp: While the tax treaty generally applies to US residents, the classification of the US entity (e.g., LLC taxed as a partnership vs. C-Corp) can impact how the US entity reports income and how the treaty provisions are applied on the US side. From the Thai payer's perspective, the primary concern is the WHT rate based on the nature of the payment and the US entity's tax residency. Always confirm the US entity's tax status and its implications for treaty benefits.
- Dividend vs. Service Payment: The WHT rates differ significantly (15% for dividends, 0% for services). Mischaracterizing a payment can lead to incorrect WHT application or potential penalties. Fix: Ensure the payment's nature is accurately reflected in all documentation and communication with the bank.
- Large vs. Small Amounts: While the BOT has a general USD 1 million annual limit, very large transactions (e.g., multi-million dollar payments) will almost certainly attract increased scrutiny and require more extensive documentation and potentially longer approval times from the bank and possibly the BOT. Small, routine service payments are generally smoother.
When you don't need us
If you are making a straightforward payment for services to a US company, have all the necessary documentation (invoice, contract, US tax residency certificate), and the amount is within typical operational limits, you can generally manage the payment process directly through your commercial bank or a fintech platform. The US-Thailand tax treaty simplifies many service payments to 0% WHT, making routine transactions relatively uncomplicated.
When Keystone Bridge helps
Keystone Bridge can provide invaluable assistance when payments become complex. This includes situations involving:
- Payments exceeding BOT's standard thresholds or requiring special approvals.
- Unclear tax treaty application for specific types of income or complex entity structures.
- Structuring large or recurring payments to optimize for tax efficiency and regulatory compliance.
- Navigating intricate FX controls or dealing with non-standard documentation requirements.
- Ensuring full compliance with both Thai and US regulations to mitigate risks and avoid penalties. Our expertise helps streamline these complex cross-border transactions, providing peace of mind and operational efficiency.
For the broader picture on this topic, see our guide on how to pay a US company from your country.
For the broader picture on this topic, see the Thailand banking guide.