Thundthornthep Yaem-Uthai, Ph.D. | LAS Legal | Updated 16 April 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 475–482 (Warranty) and Sections 680–701 (Guarantee) — to Bank Guarantees, Parent Company Guarantees, common drafting mistakes, landmark Supreme Court decisions, and a 6-question FAQ.
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), Part 5, provides a comprehensive framework for the seller's warranty obligations.
Section 475 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.
TCCC Section 476 provides that the seller is not liable for defects that arise from property belonging to the buyer, or that arise after delivery as a result of the buyer's fault or negligence.
TCCC Section 480 provides that for sales of movable property, the limitation period for a defect claim is one year from the date of delivery.
TCCC Section 481 provides that a warranty claim becomes time-barred one year from the date the buyer discovers the defect. In any event, no claim may be brought more than five years after the date of delivery (the long-stop period).
| Type of Defect | Limitation Period | Calculated From |
|---|---|---|
| Patent Defect (visible at delivery) | 1 year | Date of delivery (Sec. 480) |
| Latent Defect (hidden, discovered later) | 1 year | Date buyer discovers the defect (Sec. 481) |
| Long-stop (any case) | 5 years | Date of delivery (Sec. 481, para. 2) |
TCCC Section 483 permits the parties to agree to exclude or limit the seller's warranty liability. However, there is an important limitation.
TCCC Section 483, paragraph 2 provides that if the seller knew of the defect but concealed it, any agreed exclusion of warranty liability is void. If the seller knew and concealed — the exclusion clause is unenforceable and the seller remains fully liable. Option A: Buyers should require the seller to give an express representation that there are no hidden defects. | Option B: In M&A transactions, include an Indemnification clause specifically for Latent Defects that are not disclosed.
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."
TCCC Section 682 provides that the guarantor is liable for the principal debt together with interest, damages, and costs of enforcement, unless the agreement limits liability to a specific amount. Without a cap, the guarantor may face liability for accumulated interest, penalties, and legal costs — often far more than expected.
The guarantor has several important statutory rights, some of which may be waived by agreement.
| Right | Section | Content | Waivable? |
|---|---|---|---|
| Right of Discussion (เกี่ยง) | Sec. 688 | Require the creditor to enforce against the principal debtor first, before claiming from the guarantor | Yes |
| Right to Require Enforcement Against Secured Property First | Sec. 689 | If the debtor has mortgaged or pledged property, require enforcement against that property first | Yes |
| Right of Recourse | Sec. 693 | After paying the debt, the guarantor may seek reimbursement from the principal debtor | No |
| Right of Subrogation | Sec. 694 | After payment, the guarantor is subrogated to all the creditor's rights against the debtor | No |
| Right to Notice of Default | Sec. 686 | The creditor must notify the guarantor when the debtor defaults | — |
| # | Issue | Warranty | Guarantee |
|---|---|---|---|
| 1 | Nature | Assurance of the quality of goods/services | Assurance that a third party's debt will be paid |
| 2 | Parties | Two parties (seller – buyer) | Three parties (creditor – debtor – guarantor) |
| 3 | Key sections | TCCC Sec. 472-482 | TCCC Sec. 680-701 |
| 4 | Writing required? | No — arises by operation of law | Yes — written document signed by guarantor (Sec. 680, para. 2) |
| 5 | Who is liable? | Seller / service provider directly | Guarantor (third party) |
| 6 | When does the right arise? | When the goods have a defect | When the debtor defaults on the principal obligation |
| 7 | Limitation period | 1 year from discovery of defect (Sec. 481) | Follows the limitation period of the principal debt (Sec. 697) |
| 8 | Accessory nature? | No — not an accessory contract | Yes — accessory to the principal debt |
| 9 | Right of discussion? | None | Yes — Sec. 688 (but waivable) |
| 10 | Business example | Purchase of machinery with a 2-year warranty | Bank loan — director provides a personal guarantee |
In significant commercial transactions, creditors typically require a guarantee from a reliable source. There are two main types:
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.
| Issue | Bank Guarantee | Personal Guarantee |
|---|---|---|
| Guarantor | Bank (financial institution) | Individual or legal entity |
| Creditworthiness | Very high — bank has strong financial standing | Depends on the guarantor's personal financial position |
| Cost | Annual fee 0.5–2% | No fee (but significant risk) |
| Payment mechanism | Pay immediately on demand (Demand Guarantee) | Must prove debtor's default first |
| Right of discussion | Typically waived in the agreement | Available under Sec. 688 unless waived |
| Used in | Performance Bond, Bid Bond, Advance Payment Guarantee | Bank loans, lease agreements, construction contracts |
Some Bank Guarantees are ambiguous about the conditions for demand — e.g., what documents must be submitted, whether proof of default is required, or whether it is an Unconditional (First Demand) Guarantee. Option A: Specify clearly whether the guarantee is a "First Demand Guarantee" or a "Conditional Guarantee," and list the documents required for demand. | Option B: Set a clear Expiry Date aligned with the duration of the underlying transaction.
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.
When a debtor defaults, the creditor must follow the correct procedure to enforce against the guarantor:
The 2014 amendment to TCCC Section 686 imposed a mandatory duty on creditors to notify guarantors before enforcing. Many creditors are still unaware of this requirement, resulting in the loss of their right to claim interest and damages for the period before the notice was given. Option A: Implement an automated tracking system for payment due dates that triggers a Section 686 notice letter automatically. | Option B: In the guarantee agreement, provide for the guarantor to waive the 60-day advance notice requirement (where permitted by law).
| Issue | Thai Law (TCCC) | Common Law (England / USA) |
|---|---|---|
| Form requirement | Must be written and signed by guarantor (Sec. 680) | Writing required under Statute of Frauds |
| Right of discussion | Automatic statutory right (Sec. 688) — waivable | Does not arise automatically — must be expressly agreed |
| Duty to notify on default | Creditor must notify guarantor 60 days before default (Sec. 686 as amended 2014) | No equivalent mandatory provision in most Common Law systems |
| Effect of time extension | Granting extension without guarantor's consent releases the guarantor (Sec. 700) | Time extension does not automatically release guarantor — depends on intent and effect |
| Cap on liability | Sec. 682 — parties may agree to limit | Parties may also agree to limit |
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.
| Type | Meaning | Remedy for Breach | Limitation Period |
|---|---|---|---|
| Representation | Statement of fact as of the date of the contract | Rescission or damages (Misrepresentation) | As provided by law |
| Warranty | Contractual assurance (a binding promise) | Damages only (no rescission) | As agreed in the contract |
| Indemnity | Direct obligation to compensate for specified losses | Dollar-for-dollar reimbursement — no need to prove loss | As agreed in the contract |
Clause [__]. Representations and Warranties
[__].1 The Seller represents and warrants to the Buyer, as of the date of this Agreement and as of the Closing Date, that:
(a) The Company has been duly incorporated and remains validly subsisting under applicable law;
(b) The financial statements of the Company attached hereto have been prepared in accordance with applicable financial reporting standards and fairly present the financial position of the Company;
(c) There is no litigation, claim, or legal proceeding pending or, to the Seller's knowledge, threatened against the Company or its assets, except as disclosed in the Disclosure Letter.
[__].2 The Seller shall be liable to the Buyer for any loss arising from a breach of the Warranties above, provided that the Seller's aggregate liability shall not exceed [___] Baht, and any claim must be notified in writing within [12/18/24] months from the Closing Date.
A guarantor who signs a Continuing Guarantee without a Maximum Liability Cap may find themselves liable for a cumulative debt far beyond their expectation, because the creditor may increase the debtor's facility without the guarantor's knowledge. Option A: Always specify a Maximum Liability Amount — e.g., "The Guarantor's liability shall not exceed [x] Baht in aggregate." | Option B: Include a Review Period requiring the creditor to disclose the current outstanding balance to the guarantor every six months.
| Decision | Facts | Ruling | Key Principle |
|---|---|---|---|
| Supreme Court Decision No. 4467/2553 | Warranty of title — land sold partly owned by a third party | Seller liable for breach of title warranty; buyer entitled to claim proportional reduction in price and damages | Seller's warranty of title extends to the full extent of the buyer's interest; partial title defect still triggers warranty liability |
| Supreme Court Decision No. 5099/2560 | Transfer of claim later seized by a third party | Seller who transferred a claim without disclosing the risk of seizure by a third party breached the warranty against defects in title | Warranty of title applies not only to physical property but also to transferred claims and rights |
| Supreme Court Decision No. 1884/2566 | Guarantee clause containing a provision contrary to Section 681/1 | The clause was declared void — guarantors may not be required to pre-waive the right to be notified of an assignment of the guarantee | Certain mandatory guarantor protections cannot be waived even by express agreement; void clauses do not affect the remaining guarantee |
| Supreme Court Decision No. 8425/2563 | Guarantor sought right of recourse against principal debtor after paying in full | The guarantor who paid in full was entitled to full recourse under Section 693, including interest from the date of payment | The right of recourse (Sec. 693) is inalienable — it cannot be contracted out of, and includes ancillary costs and interest |
| Supreme Court Decision No. 3991/2559 | Principal debt fully extinguished by novation — creditor then sought to enforce guarantee | Guarantee terminated automatically when the principal debt was extinguished by novation. Creditor's claim against guarantor dismissed. | The accessory nature of guarantee (Sec. 681) means the guarantee falls away entirely when the principal obligation ceases to exist |
| Situation | Appropriate Tool | Reason |
|---|---|---|
| Sale of goods / machinery | Warranty Clause | Direct quality assurance by seller to buyer — TCCC Sec. 475 |
| Construction contract (contractor) | Warranty + Performance Bond | Warranty for workmanship quality + Bond to guarantee completion of work |
| M&A transaction | R&W Clause + Indemnity | Seller warrants the facts about the business; indemnity provides a direct compensation mechanism |
| Business loan (director guarantee) | Personal Guarantee | Individual guarantees the company's debt to the lender — TCCC Sec. 680 |
| Large project / tender | Bank Guarantee | Bank-issued guarantee with immediate pay on demand; high credibility |
| Subsidiary entering major contract | Parent Company Guarantee | Parent company backs the subsidiary's obligations |
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.
Company A sued under Warranty (TCCC Sections 472–475), claiming the defect existed prior to delivery.
Outcome: Company A prevailed. It proved through technical evidence that the defect was inherent — not caused by misuse. The seller was ordered to repair the machinery and compensate for production losses during the downtime.
Lesson: Always conduct a thorough Acceptance Test before taking delivery, document the condition in writing, and keep records throughout the Warranty period.
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 60-day notice required under TCCC Section 686.
The director challenged the claim on the ground that the Section 686 notice was not given within 60 days of default.
Outcome: The landlord lost the right to claim interest and damages for the period of the notice default. Only the principal rent arrears could be recovered for that period.
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.
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.
The parent was held liable for the full amount, including all ancillary costs and interest, because the guarantee had no cap. The total exceeded the parent's initial expectation by over 40%.
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.
In significant contracts, Warranty and Guarantee may be used in combination. For example, in an M&A agreement: R&W Clause (seller warrants the quality of the business) together with an Escrow Account or Parent Company Guarantee (to ensure the seller can actually pay damages if a warranty is breached). This dual-layer approach gives the buyer both quality assurance and enforcement certainty.
| Scenario | Risk Level | Recommendation |
|---|---|---|
| Seller knew of defect and concealed it | 🔴 High | Cannot exclude liability — Sec. 483, para. 2; potential criminal liability also |
| Guarantee not made in writing | 🔴 High | Unenforceable under Sec. 680, para. 2 — no exceptions |
| No Section 686 notice given 60 days before default | 🔴 High | Creditor loses right to claim interest and damages for the notice default period |
| Scope of guaranteed debt not clearly defined | 🟡 Medium | Disputes about what is covered — specify precisely in the agreement |
| No Warranty clause in M&A agreement | 🟡 Medium | Must rely on statutory warranty law — may not cover all relevant issues |
| Complete guarantee with defined scope and cap in place | 🟢 Low | Low risk — still must follow Sec. 686 procedure when enforcing |
Warranty and Guarantee are fundamentally different legal instruments. Warranty is a direct quality assurance by the seller under TCCC Sections 475–482. Guarantee is a three-party accessory agreement under TCCC Sections 680–701 — and it must be in writing. 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.
Disclaimer: This article is prepared for academic and general informational purposes only. It does not constitute legal advice for any specific situation. Readers should consult qualified legal counsel before taking any legal action. | บทความนี้จัดทำเพื่อวัตถุประสงค์ทางวิชาการและให้ความรู้ทั่วไปเท่านั้น ไม่ถือเป็นคำแนะนำทางกฎหมายเฉพาะราย