A Loan Agreement in Thailand is not merely a private financial arrangement.
Under the Civil and Commercial Code, enforceability depends on statutory formalities, evidentiary standards, interest limitations, and limitation periods.

For foreign investors and corporate groups, loan agreements are frequently used in:

  • Shareholder financing structures

  • Joint venture capital arrangements

  • Intercompany funding

  • Project bridge financing

  • Cross-border lending transactions

Improperly structured loans may become partially unenforceable, tax-inefficient, or procedurally defective.

For company structuring context, see:
→ Company Incorporation Thailand

1. Legal Nature of a Loan Under Thai Law

A loan of money is classified as a “loan for consumption” under Section 650 of the Civil and Commercial Code.

Key characteristics:

  • Ownership of funds transfers to the borrower

  • The borrower must return the same amount

  • The contract becomes complete upon delivery of funds

In litigation, proof of transfer (bank evidence) is often decisive.

2. Written Evidence & Enforceability

Under Section 653 CCC:

  • Loans exceeding THB 2,000 require written evidence signed by the borrower.

  • Electronic communications may serve as evidence under the Electronic Transactions Act.

  • Repayment must also be evidenced in writing to be enforceable.

Additionally, loan agreements must bear proper stamp duty under the Revenue Code to be admissible in court proceedings.

For tax implications of interest deductibility, see:
→ Corporate Income Tax Thailand

3. Interest Rate & Usury Limitations

Thai law provides:

  • Maximum contractual interest: 15% per annum (unless financial institution exception applies).

  • Excess interest is reduced to the statutory maximum.

  • Compound interest is generally prohibited unless compliant with Section 655 CCC.

Interest structuring in shareholder or intercompany loans must also consider transfer pricing compliance.

→ Transfer Pricing Thailand
https://www.golawphuket.com/legal-advisory/corporate-investment/transfer-pricing-thailand/

4. Limitation Period (Prescription)

  • Standard prescription: 10 years from due date.

  • Instalment-based repayment may reduce the claim period to 5 years.

Limitation analysis is particularly relevant in long-term shareholder financing arrangements.

5. Corporate & Cross-Border Loan Structures

In commercial practice, loan agreements frequently interact with:

  • Shareholder governance rights

  • Director authority

  • Cross-border tax exposure

  • Permanent establishment risk

Foreign lenders must assess:

Loan documentation should be aligned with broader governance planning:

→ Corporate Governance Thailand

6. Interaction with Security Structures

A loan without security exposes the creditor to enforcement risk.

Security mechanisms such as mortgage, pledge, or suretyship should be considered.

→ Security Agreement Thailand

Strategic Advisory Note

Loan Agreement Thailand should be structured as part of a broader financing architecture — integrating tax planning, governance design, and enforcement strategy.

Improper drafting frequently results in:

  • Unenforceable interest provisions

  • Stamp duty defects

  • Transfer pricing exposure

  • Litigation vulnerability

Structured documentation preserves enterprise value.