Warranty vs Guarantee Under Thai Law — Complete Guide ✓

✓ Legal content last reviewed 29 September 2026 · synced with the audited Thai edition

Thundthornthep Yamoutai, Ph.D. | LAS Legal | Published 3 April 2026 | Last updated 28 September 2026 | ภาษาไทย

"Warranty" and "Guarantee" sound similar — but under Thai law they are entirely different legal instruments. Many business operators use these terms interchangeably without realising that the legal consequences are radically different. This article covers everything from the statutory framework — TCCC Sections 472–474 (Warranty) and Sections 680–701 (Guarantee) — to Bank Guarantees, Parent Company Guarantees, common drafting mistakes, landmark Supreme Court decisions, and a 6-question FAQ.

      มาตรา ๖๘๐  อันว่าค้ำประกันนั้น คือสัญญาซึ่งบุคคลภายนอกคนหนึ่ง เรียกว่าผู้ค้ำประกัน ผูกพันตนต่อเจ้าหนี้คนหนึ่งเพื่อชำระหนี้ในเมื่อลูกหนี้ไม่ชำระหนี้นั้น

      อนึ่ง สัญญาค้ำประกันนั้น ถ้ามิได้มีหลักฐานเป็นหนังสืออย่างใดอย่างหนึ่งลงลายมือชื่อผู้ค้ำประกันเป็นสำคัญ ท่านว่าจะฟ้องร้องให้บังคับคดีหาได้ไม่

Read มาตรา ๖๘๐ in the box. The statutory Thai text is the PDF. English on this page is a reading aid.

Warranty — Quality Assurance Under TCCC Sections 472–474

In the context of a sale of goods, a Warranty — or more precisely, the warranty against defects — is the seller's obligation to deliver goods of the agreed quality, free of defects. TCCC Book 3, Title 1 (Sale of Property), Chapter 2, Part 2, provides the statutory framework for the seller's warranty obligations.

      มาตรา ๔๗๒  ในกรณีที่ทรัพย์สินซึ่งขายนั้นชำรุดบกพร่องอย่างหนึ่งอย่างใด อันเป็นเหตุให้เสื่อมราคาหรือเสื่อมความเหมาะสมแก่ประโยชน์อันมุ่งจะใช้เป็นปกติก็ดี ประโยชน์ที่มุ่งหมายโดยสัญญาก็ดี ท่านว่าผู้ขายต้องรับผิด

      ความทกล่าวมาในมาตรานี้ย่อมใช้ได้ ทั้งทผู้ขายรู้อยู่แล้วหรือไม่รู้ว่าความชำรุดบกพร่องมีอยู่

      มาตรา ๔๗๕  หากว่าบุคคลผู้ใดมาก่อการรบกวนขัดสิทธิของผู้ซื้อในอันจะครองทรัพย์สินโดยปกติสุข เพราะบุคคลผู้นั้นมีสิทธิเหนือทรัพย์สินที่ได้ซื้อขายกันนั้นอยู่ในเวลาซื้อขายก็ดี เพราะความผิดของผู้ขายก็ดี ท่านว่าผู้ขายจะต้องรับผิดในผลอันนั้น

The official PDF puts defects in มาตรา ๔๗๒ and eviction (รอนสิทธิ) in มาตรา ๔๗๕. Do not read มาตรา ๔๗๕ as a quality-warranty section. The English sentence that used to sit here was a lecture, not the statute.

Section 472 establishes the crucial principle that the seller's warranty liability is independent of the seller's knowledge. Even if the seller was unaware of the defect, liability still attaches — provided the defect existed at the time of delivery. This differs fundamentally from fraud or criminal liability, which requires proof of intent.

Types of "Defect" Recognised Under Thai Law

• Defects reducing the value of the goods: The goods are in a worse condition than they should be — e.g., a vehicle with undisclosed mechanical faults.
• Defects reducing fitness for ordinary use: The goods cannot be used for their intended purpose — e.g., machinery that cannot produce at the advertised specification.
• Defects inconsistent with the contract specification: The goods do not meet the specific requirements agreed in the contract.

Warranty Elements and Limitation Periods

Section 476 — Known Third-Party Rights

      มาตรา ๔๗๖  ถ้าสิทธิของผู้ก่อการรบกวนนั้นผู้ซื้อรู้อยู่แล้วในเวลาซื้อขาย ท่านว่าผู้ขายไม่ต้องรับผิด

Read มาตรา ๔๗๖ in the box. The statutory Thai text is the PDF. English on this page is a reading aid.

TCCC Section 476 concerns eviction, not quality defects: the seller is not liable where the buyer already knew of the interfering third party's right at the time of sale.

Section 480 — Legal Servitudes over Immovable Property

      มาตรา ๔๘๐  ถ้าอสังหาริมทรัพย์ต้องศาลแสดงว่าตกอยู่ในบังคับแห่งภาระจำยอมโดยกฎหมายไซร้ ท่านว่าผู้ขายไม่ต้องรับผิด เว้นไว้แต่ผู้ขายจะได้รับรองไว้ในสัญญาว่าทรัพย์สินนั้นปลอดจากภาระจำยอมอย่างใด ๆ ทั้งสิ้น หรือปลอดจากภาระจำยอมอันนั้น

Read มาตรา ๔๘๐ in the box. The statutory Thai text is the PDF. English on this page is a reading aid.

TCCC Section 480 concerns immovable property declared by a court to be subject to a legal servitude. The seller is not liable unless the contract warrants freedom from that servitude; this section does not set a defect-claim limitation period.

Section 481 — Limitation for Specified Eviction Claims

      มาตรา ๔๘๑  ถ้าผู้ขายไม่ได้เป็นคู่ความในคดีเดิม หรือถ้าผู้ซื้อได้ประนีประนอมยอมความกับบุคคลภายนอก หรือยอมตามที่บุคคลภายนอกเรียกร้องไซร้ ท่านห้ามมิให้ฟ้องคดีในข้อรับผิดเพื่อการรอนสิทธิเมื่อพ้นกำหนดสามเดือนนับแต่วันคำพิพากษาในคดีเดิมถึงที่สุด หรือนับแต่วันประนีประนอมยอมความ หรือวันที่ยอมตามบุคคลภายนอกเรียกร้องนั้น

Read มาตรา ๔๘๑ in the box. The statutory Thai text is the PDF. English on this page is a reading aid.

TCCC Section 481 sets a three-month limitation for eviction claims where the seller was not a party to the original proceedings, or the buyer settled with or accepted the third party's claim. It runs from the final judgment, settlement or acceptance, as applicable. Liability for defects is governed by Section 474: one year from discovery of the defect. Neither section prescribes a general five-year long-stop from delivery.

Excluding or Limiting Warranty Liability

TCCC Section 483 permits the parties to agree to exclude or limit the seller's warranty liability. However, there is an important limitation.

      มาตรา ๔๘๓  คู่สัญญาซื้อขายจะตกลงกันว่าผู้ขายจะไม่ต้องรับผิดเพื่อความชำรุดบกพร่องหรือเพื่อการรอนสิทธิก็ได้

Read มาตรา ๔๘๓ in the box. The statutory Thai text is the PDF. English on this page is a reading aid.

Warranty Limitations Requiring Legal Review

• "As Is Where Is": Selling in the current condition, as inspected — subject to Sections 473 and 483–485 and applicable unfair-contract-terms protections; inspection alone does not validate every exclusion.
• Contractual claim notification: An agreed notification deadline must be distinguished from statutory limitation. Section 193/11 prohibits agreements to waive, extend or shorten a statutory limitation period; the validity of any contractual notice condition requires separate review.
• Cap on damages: Limiting damages to the purchase price or a percentage thereof.
• Exclusion of indirect damages: Any exclusion of consequential loss or lost profits requires review under the applicable mandatory law; business-to-business status does not make every exclusion enforceable.

Guarantee — Debt Guarantee Under TCCC Sections 680-701

TCCC Section 680 defines a guarantee as follows: "A contract of suretyship is a contract whereby a person, called the surety, binds himself to a creditor to discharge an obligation in case the debtor fails to discharge it."

Elements of a Guarantee Agreement

• Parties: the guarantee is a contract between the guarantor (surety) and the creditor under TCCC Section 680, paragraph 1; the principal debtor is a party to the guaranteed principal obligation, not to the guarantee contract.
• Signed written evidence: under TCCC Section 680, paragraph 2, a guarantee cannot be enforced by action unless there is written evidence signed by the guarantor. Electronic records and electronic signatures that meet Sections 8 and 9 of the Electronic Transactions Act B.E. 2544 may satisfy these requirements.
• The guaranteed debt must exist or be determinable: Under Section 681, the guaranteed debt or contract must be expressly identified. A guarantee of future or conditional debt must state its purpose, nature, maximum guaranteed amount and period for incurring the debt; a continuing guarantee under Section 699 may omit that period.
• Accessory nature: The guarantee is an accessory contract to the principal debt. Section 698 releases the guarantor when the principal debt is extinguished.

Sections 682–684 — Co-sureties and Scope of Liability

      มาตรา ๖๘๒  ท่านว่าบุคคลจะยอมเข้าเป็นผู้รับเรือน คือเป็นประกันของผู้ค้ำประกันอีกชั้นหนึ่ง ก็เป็นได้

      ถ้าบุคคลหลายคนยอมตนเข้าเป็นผู้ค้ำประกันในหนี้รายเดียวกันไซร้ ท่านว่าผู้ค้ำประกันเหล่านั้นมีความรับผิดอย่างลูกหนี้ร่วมกัน แม้ถึงว่าจะมิได้เข้ารับค้ำประกันรวมกัน

Read มาตรา ๖๘๒ in the box. The statutory Thai text is the PDF. English on this page is a reading aid.

Section 682 concerns sub-suretyship and joint liability of co-sureties. Section 683 extends an unlimited guarantee to interest, damages and accessories of the guaranteed debt. Section 684 addresses litigation costs, excluding those costs where the creditor sued without first demanding payment from the guarantor. Section 681 requires a maximum guaranteed amount for future or conditional debt; an omitted cap does not automatically create unlimited liability.

Guarantor's Rights Under Thai Law

The guarantor has several important statutory rights, some of which may be waived by agreement.

      มาตรา ๖๘๖   เมื่อลูกหนี้ผิดนัด ให้เจ้าหนี้มีหนังสือบอกกล่าวไปยังผู้ค้ำประกันภายในหกสิบวันนับแต่วันที่ลูกหนี้ผิดนัด และไม่ว่ากรณีจะเป็นประการใดเจ้าหนี้จะเรียกให้ผู้ค้ำประกันชำระหนี้ก่อนที่หนังสือบอกกล่าวจะไปถึงผู้ค้ำประกันมิได้ แต่ไม่ตัดสิทธิผู้ค้ำประกันที่จะชำระหนี้เมื่อหนี้ถึงกำหนดชำระ

      ในกรณีที่เจ้าหนี้มิได้มีหนังสือบอกกล่าวภายในกำหนดเวลาตามวรรคหนึ่ง ให้ผู้ค้ำประกันหลุดพ้นจากความรับผิดในดอกเบี้ยและค่าสินไหมทดแทน ตลอดจนค่าภาระติดพันอันเป็นอุปกรณ์แห่งหนี้รายนั้นบรรดาที่เกิดขึ้นภายหลังจากพ้นกำหนดเวลาตามวรรคหนึ่ง

      เมื่อเจ้าหนี้มีสิทธิเรียกให้ผู้ค้ำประกันชำระหนี้หรือผู้ค้ำประกันมีสิทธิชำระหนี้ได้ตามวรรคหนึ่ง ผู้ค้ำประกันอาจชำระหนี้ทั้งหมดหรือใช้สิทธิชำระหนี้ตามเงื่อนไขและวิธีการในการชำระหนี้ที่ลูกหนี้มีอยู่กับเจ้าหนี้ก่อนการผิดนัดชำระหนี้  ทั้งนี้ เฉพาะในส่วนที่ตนต้องรับผิดก็ได้ และให้นำความในมาตรา ๗๐๑ วรรคสอง มาใช้บังคับโดยอนุโลม

      ในระหว่างที่ผู้ค้ำประกันชำระหนี้ตามเงื่อนไขและวิธีการในการชำระหนี้ของลูกหนี้ตามวรรคสาม เจ้าหนี้จะเรียกดอกเบี้ยเพิ่มขึ้นเพราะเหตุที่ลูกหนี้ผิดนัดในระหว่างนั้นมิได้

      การชำระหนี้ของผู้ค้ำประกันตามมาตรานี้ ไม่กระทบกระเทือนสิทธิของผู้ค้ำประกันตามมาตรา ๖๙๓

Read มาตรา ๖๘๖ in the box. The statutory Thai text is the PDF. English on this page is a reading aid.

Termination of the Guarantee Agreement

Circumstances in Which the Guarantor Is Released

• Principal debt extinguished: When the debtor fully repays the debt, the guarantee terminates automatically.
• Creditor grants extension of time without guarantor's consent: Section 700 concerns an extension of debt payable at a fixed time without guarantor consent. Review its limits on advance consent, its financial-institution/professional-guarantor exception and the debt-reduction exception in Section 691.
• Creditor allows the security to deteriorate: Under Section 697, if the creditor's conduct prevents the guarantor from exercising subrogation rights, the guarantor is released to the extent of the resulting loss.
• Guarantee has a fixed term: Check whether the end date limits new debts or also affects existing liabilities; expiry does not necessarily extinguish liability for debts already covered.
• Guarantor gives notice of termination: In a continuing guarantee with no fixed term, the guarantor may terminate for the future by notifying the creditor and is not liable for the debtor's transactions after the notice reaches the creditor (Section 699).

10-Point Comparison: Warranty vs Guarantee

Bank Guarantee vs Personal Guarantee

In significant commercial transactions, creditors typically require a guarantee from a reliable source. There are two main types:

Bank Guarantee — Letter of Guarantee from a Bank

A Bank Guarantee is a letter issued by a bank to its customer, assuring a third party (the beneficiary) that the bank will pay the specified amount if the customer (the principal) fails to fulfil its obligations.

Parent Company Guarantee

In corporate transactions — particularly in multinational groups or multi-entity SME structures — creditors often require a Parent Company Guarantee (PCG) from the holding company. The PCG assures the creditor that if the subsidiary that is the contracting party cannot pay, the parent company will step in.

Key Features of a Parent Company Guarantee

• Corporate Guarantee: A legal entity (the parent) is the guarantor — a board resolution approving the guarantee is required before signing.
• On Demand vs Conditional: Specify whether the guarantee is payable immediately on demand or only after the subsidiary's default is established.
• Continuing Guarantee: The PCG typically covers all debts arising from the business relationship, not just a single transaction.
• Change of control provisions: Specify whether a change in ownership, management, or corporate restructuring of the subsidiary will affect the PCG.

Enforcement of a Guarantee — Step-by-Step

When a debtor defaults, the creditor must follow the correct procedure to enforce against the guarantor:

1. Confirm that the debtor has actually defaulted: Identify the due date and confirm non-payment.
2. Send written notice to the guarantor: The creditor must send written notice within 60 days from the debtor's default and may not demand payment before notice reaches the guarantor. Late notice releases the guarantor from interest, damages and accessories arising after the 60-day deadline, rather than from all principal liability. Section 685/1 makes agreements differing from Section 686 void.
3. Demand payment from the guarantor: If the guarantor has waived the right of discussion, the creditor may demand directly from the guarantor without first pursuing the debtor.
4. If payment is not made — commence proceedings: File a claim in the court of competent jurisdiction, supported by the guarantee agreement, evidence of default, and proof of the Section 686 notice.

Special Features of Thai Guarantee Law vs Common Law

Warranty in M&A Transactions — Representations and Warranties

In Share Purchase Agreements (SPAs) and Asset Purchase Agreements (APAs), Representations and Warranties (R&W) are at the heart of the transaction. They are the seller's contractual assurance of the facts about the business being sold — the basis on which the buyer makes its acquisition decision.

Categories of Representations and Warranties

• Corporate Warranties: Confirm due incorporation, authority, articles of association, board resolutions
• Financial Warranties: Confirm accuracy of financial statements; no hidden liabilities
• Title Warranties: Confirm ownership of assets; no encumbrances
• Operational Warranties: Confirm key contracts, customer/supplier relationships, no pending disputes
• IP Warranties: Confirm ownership of all intellectual property
• Employment Warranties: Confirm employment contracts; no pending labour claims
• Tax Warranties: Confirm tax compliance; no unpaid taxes

Distinction Between Warranty, Representation and Indemnity

Continuing Guarantee vs Specific Transaction Guarantee

Continuing Guarantee

• Covers all debts arising from the ongoing relationship between the creditor and debtor — not limited to a single transaction.
• Common in bank facilities and revolving credit lines.
• Risk: The guarantor may not know the total accumulated debt at any given time.
• Always specify a Maximum Liability Cap in the agreement.

Specific Transaction Guarantee

• Guarantees a specific identified debt — e.g., Loan Tranche [x] in the amount of [x] Baht.
• When that specific debt is repaid, the guarantee terminates automatically.
• Lower risk for the guarantor — the scope is clearly defined from the outset.

Statutory Rules on Warranty and Guarantee

The table below summarises the rules of the Thai Civil and Commercial Code on warranty (the seller's liability) and guarantee that business operators should know, drawn directly from the statutory text.

Common Mistakes in Warranty and Guarantee Practice

Warranty Mistakes

• Buyer fails to inspect goods before accepting delivery: Makes it harder to prove that the defect existed before delivery — always inspect and record the condition of goods at the time of handover.
• Notifying the defect too late: The one-year limitation period under Section 474 runs from the date of discovery — act immediately.
• No Warranty clause in the contract: The law imposes warranty obligations automatically, but an explicit contractual warranty clause is clearer, especially in M&A transactions.
• Confusing Warranty with Indemnity: Warranty is a contractual assurance; remedies depend on the applicable law and breach. Indemnity allocates specified losses, but does not automatically dispense with proof. Contractual notification conditions must be distinguished from statutory limitation periods.

Guarantee Mistakes

• Guarantee without qualifying signed written evidence: Court enforcement requires signed written evidence under Section 680, paragraph 2; qualifying electronic evidence is not automatically excluded.
• Failure to specify the scope of the guaranteed debt: Creates disputes about which obligations are covered. Always define the guaranteed debt precisely.
• Granting extension of time to the debtor without notifying the guarantor: For debt payable at a fixed time, Section 700 releases the guarantor upon an extension without consent. Advance consent is generally ineffective, with the statutory exception for financial institutions or persons regularly guaranteeing for remuneration. Section 691 also contains an exception for specified post-default debt-reduction agreements.
• Forgetting the Section 686 notice obligation: Late notice releases interest, damages and accessories arising after the 60-day deadline under Section 686; the protection cannot be waived.
• Failure to verify the director's authority to sign the guarantee: A director who signs a corporate guarantee without a valid board resolution approving it may not bind the company — and may face personal liability. Always obtain and verify the board resolution.

LAS Practical Guide — Choosing the Right Tool: Warranty or Guarantee

Illustrative Scenarios — Thai SMEs and Warranty / Guarantee

Case 1: Defective Machinery — Potential Warranty Claim (Company A)

Company A purchased food processing machinery worth THB 5 million. The contract included a 1-year Warranty. Eight months after delivery, the machinery malfunctioned and caused product spoilage. The seller argued that misuse by Company A's operators caused the damage.

Outcome: In this illustrative scenario, Company A would need technical evidence that the defect was inherent rather than caused by misuse. Any remedy and compensation depend on the proven breach, loss, applicable law and limitation period; no reported judgment is asserted here.

Lesson: Always conduct a thorough Acceptance Test before taking delivery, document the condition in writing, and keep records throughout the Warranty period.

Case 2: Office Lease — Director Guarantee and the Section 686 Notice (Company B)

Company B leased commercial office space. The company's director signed a separate personal guarantee. Company B defaulted on rent. The landlord immediately sued the director as guarantor — without giving the written default notice required under TCCC Section 686.

Outcome: Before notice reaches the guarantor, the landlord cannot demand payment from the guarantor. If notice is not sent within 60 days after default, the guarantor is released from interest, damages and accessories arising after that deadline; this does not itself extinguish the principal debt. This scenario is hypothetical and illustrates the legal principle; it is not an actual judgment.

Option A (Creditor): Always calendar the Section 686 notice obligation immediately upon any default. | Option B (Guarantor): Before accepting liability, verify whether all Section 686 procedural requirements were fulfilled by the creditor.

Case 3: M&A — Parent Company Guarantee Without a Cap (Company C)

In an M&A transaction, the parent company (Company C Parent) issued a Parent Company Guarantee covering "all obligations of the subsidiary." After closing, the subsidiary became insolvent. The buyer enforced the guarantee, claiming not only the purchase price shortfall but also all post-closing liabilities — including interest arrears, penalties, and legal costs. No Maximum Liability Amount had been specified in the guarantee.

Lesson: Always specify a Maximum Liability Amount in any Parent Company Guarantee. Consider adding a Sunset Clause limiting the guarantee to a fixed period after closing.

Checklist — 10 Points Before Signing a Warranty or Guarantee Clause

LAS Risk Assessment — Warranty & Guarantee

Frequently Asked Questions (FAQ)

Summary

Warranty and Guarantee are fundamentally different legal instruments. Warranty is a direct quality assurance by the seller under TCCC Sections 472–474. Guarantee is an accessory contract between the guarantor and the creditor under TCCC Sections 680–701 — and requires signed written evidence for court enforcement. Understanding the distinction, choosing the right instrument for the situation, and following the correct procedure — especially the 60-day Section 686 notice rule — are essential to enforcing these instruments effectively. The LAS Shield principle: know your legal tool, choose it correctly, and protect your business the right way.

Read more: LAS Shield Part 6 — Force Majeure Under Thai Law