Shareholder Loan to a Thai Company: Documents and Tax Issues

The useful question is not simply whether the owner can send money to the company. It is what the money is supposed to become once it arrives. Equity is capital committed to the business; a shareholder loan creates a debt that the company is expected to repay under agreed terms. Leaving that choice until after the transfer is where otherwise simple funding starts to become difficult to explain.

Debt is often a practical fit for a short-term cash gap, a lease deposit, initial stock, a fit-out or funding released in stages. It keeps the owner’s claim separate from the share capital and gives the parties a defined route for repayment. That flexibility only works if the company actually records and administers the funding as a loan instead of treating the bank balance as interchangeable owner money.

Equity may be the cleaner answer where the funds are expected to stay in the company, or where capital levels matter for a licence, banking relationship, corporate arrangement or immigration-related requirement. Calling long-term risk capital a temporary loan can create a mismatch between the commercial reality and the paperwork.

A shareholder loan should also stay distinct from expense reimbursement, dividends and informal owner withdrawals. With more than one shareholder, the distinction becomes more important: one owner’s loan may sit ahead of distributions and remain outstanding during a share sale or dispute. The funding decision therefore belongs in the ownership conversation before the money moves, not in a bookkeeping clean-up afterwards.

A loan agreement should identify the lender with enough precision to support the tax and banking treatment that follows. An individual shareholder, a Thai company and an offshore company are not interchangeable recipients of interest. The document should set out the parties, currency, amount or facility limit, drawdown mechanics, maturity, early repayment rights and the consequences of late payment.

Interest terms deserve their own clause, not a casual note. State the rate if there is one, how it accrues, when it becomes payable and who bears transfer charges. An interest-free loan should be described just as clearly. Zero interest is not a universal safe harbour: related-company funding can raise arm’s-length questions, while an individual shareholder loan needs to be reviewed on its own facts.

The Thai company also needs the right person to bind it. That means checking the registered director signing conditions, the Articles and any internal approval rules that apply to the transaction. A board or shareholder resolution may be appropriate or required in a particular company, but it should not be presented as a blanket legal requirement for every shareholder loan.

Cross-border documents benefit from being explicit about governing law, language, originals, permitted currencies and what happens if the loan is extended or repaid early. The cleaner those terms are, the easier it is for the company’s bank and accountant to connect the initial remittance with later interest payments and principal repayment.

The loan instrument has a separate stamp-duty consequence. The Revenue Department’s current schedule lists duty of THB 1 for every THB 2,000, or fraction of THB 2,000, of the loan amount, capped at THB 10,000 for the instrument. That duty is different from tax on interest. Keeping the signed agreement, any required corporate approval, stamp-duty evidence, bank records and accounting entries together creates the documentary chain the transaction will need later.

A signed agreement does not fix a remittance that looks unrelated to it. The cleanest trail has the same lender on the contract and payment, an amount and currency that fit the agreed terms, and a payment reference that identifies the loan or drawdown. Where a bank message has limited space, the agreement date or reference number can still give the transaction a useful link back to the paperwork.

For an overseas advance, keep more than the Thai bank statement. The SWIFT or transfer message, credit advice, foreign-exchange record and any transaction evidence issued by the bank can become important when principal is repaid much later. They show that the company originally received debt from a particular non-resident lender instead of simply receiving unexplained shareholder funds.

Bank of Thailand rules allow foreign currency or baht to be transferred into Thailand without a general inflow cap, and they also state that residents may repay loans obtained from abroad. For foreign-exchange transactions equivalent to USD 200,000 or more, an authorised bank must request supporting documents unless it has already completed the relevant Know Your Business process. That is a documentation trigger, not a promise that smaller transactions will never be queried; banks can still ask for evidence under their customer and transaction controls.

Problems usually appear when a supposed single loan arrives through several personal accounts, with inconsistent references, and the accountant is asked to classify the money later. Splitting payments to avoid bank review only makes the evidence weaker. A usable banking trail should tell the same story as the contract before the company needs to send any money back.

The tax analysis is easier once principal and interest stop being treated as one pot of owner money. The principal creates a liability when the company receives it. Repaying that outstanding debt is economically different from paying a dividend. Interest is a separate income stream for the lender and a separate expense for the company, with its own withholding and deductibility questions.

Where the lender receiving interest is a Thai company, the Revenue Department’s corporate tax summary lists 1% withholding on interest paid to companies. That rate belongs to that recipient category. It should not be reused for an individual shareholder or a non-resident company simply because both happen to own shares.

A foreign company that does not carry on business in Thailand falls into a different framework. Section 70 covers specified Thai-source income paid to such foreign entities, and the Revenue Department’s foreign-company guide gives 15% as the domestic rate for interest and several other income categories. A double tax agreement can reduce or otherwise modify that result. Treaty residence and beneficial-owner conditions therefore need to be established before payment; an offshore bank account is not a substitute for that analysis.

Individual lenders need their own review. Residence, recipient status and the relevant treaty can change the answer, so there is no responsible single withholding percentage to publish for every foreign individual shareholder. The company’s accountant should know who the lender is before interest is booked for payment, not after the money has already left Thailand.

Related-party pricing can matter as well. The Revenue Department’s arm’s-length guidance expressly includes interest on loans when describing market price between related contracting parties. A loan between related juristic persons with unusual terms may therefore need evidence explaining the commercial reason for the funding and how the pricing was chosen. Thailand’s related-party disclosure rules also use an annual revenue threshold of THB 200 million for qualifying companies or juristic partnerships; that requirement should not be stretched to every loan merely because an individual lender owns shares.

On the accounting side, principal remains a payable until it is settled or otherwise lawfully changed. Its current or non-current presentation follows the maturity and contractual terms, while accrued interest should track the agreement and the relevant accounting period. When interest is paid, the withholding calculation and supporting tax documents need to align with the same creditor and payment. Interest deductibility is a separate corporate tax question and depends on the Revenue Code conditions and the business purpose of the expense.

This is a framework for preparing the transaction, not a personalised tax computation. The final Thai treatment can change with the lender’s legal form, tax residence, treaty position, related-party status and the actual drafting of the loan. A foreign shareholder may also have home-country reporting or tax consequences that sit outside the Thai withholding calculation.

Repayment should start with the ledger and the agreement, not with the amount the owner would like to take out of the company. The company needs a reliable outstanding principal figure, a separate interest calculation and a clear allocation of the payment between them. Combining everything into one unexplained transfer can turn a straightforward debt repayment into a tax and banking reconciliation exercise.

For a non-resident lender, the original inbound evidence becomes particularly valuable at this stage. The authorised bank may ask for the loan agreement, proof that the funds originally came in as a loan, the current balance, interest calculation and relevant withholding documents. Bank of Thailand rules generally allow repayment of loans obtained from abroad, but the bank still needs to see an obligation that can be connected to the outgoing payment.

Early repayment should follow the contract or a properly documented amendment. The same discipline applies to an extension. Allowing a fixed maturity date to pass while everyone informally assumes the loan continues creates a gap between the legal terms, the accounts and the commercial understanding.

A later decision to turn the debt into equity changes the nature of the funding. It is a separate corporate process under Thai law, with the approvals and registration steps applicable to the company; it is not merely a journal entry that relabels a payable. Debt forgiveness also needs its own accounting and tax analysis and should not be treated as an effortless way to erase the balance.

An outstanding shareholder loan remains relevant when the business is sold, a shareholder exits, partners fall out or the company closes. A buyer needs to know whether the company still owes money to a former owner, while the lender needs to know how the claim is being dealt with in the transaction. The recurring failures are usually documentary rather than exotic: no agreement before funding, an unclear lender, principal mixed with interest, missing stamp-duty treatment, interest paid before withholding and treaty analysis, or a bank unable to link the repayment to the original inflow.