Statute of Limitations for Written Contract in Thailand

Overview

In Thailand, the enforceability of a claim on a written contract is tied to a specific statute of limitations. If you miss the deadline, you may lose the ability to pursue the claim through the courts, even if the underlying debt or obligation is still factually owed.

DocketMath’s statute-of-limitations calculator is designed to help you estimate the limitation window for a written contract claim in Thailand and to understand how changing key dates affects the outcome.

Limitation period

For a written contract, the limitation period in Thailand is generally 10 years.

What “written contract” means for limitation purposes

A claim is typically treated as based on a “written contract” where the obligation is documented in writing (for example, a signed agreement, a contract letter, or a written instrument that evidences the parties’ agreement). In limitation analysis, courts often examine whether the claimant can point to a written instrument supporting the right to payment or performance.

When the clock starts: the “due date” concept

Thailand’s limitation period is commonly counted from the time the claim becomes actionable—most practically, when payment is due or when performance is required under the agreement. For business contracts, that usually aligns with:

• the contract’s stated payment due date, or
• the maturity date of an installment, or
• the date the contract requires performance (if the claim is for failure to perform).

If the contract provides a clear schedule (e.g., installment dates), limitation can become more granular:

• Each missed installment may have its own due date, creating separate limitation “start points.”
• A claim that aggregates multiple payments may still need to respect the due dates for the underlying obligations.

What ends the clock (and what doesn’t)

In practice, limitation calculations are sensitive to events around the claim, such as:

• whether a payment was made and how it was applied,
• whether a notice or demand affected “due date” timing (as opposed to actually tolling time),
• whether the creditor’s rights matured earlier by contract wording.

Because these details can change the effective “starting point,” you’ll want to enter dates that match the agreement’s payment/performance schedule—not just the date a dispute arose.

Key exceptions

Thailand’s limitation periods can be affected by circumstances that alter either how the period is counted or whether a claimant can rely on a different legal basis than “written contract.”

Below are common categories that change the analysis for document-based claims. This isn’t an exhaustive list, but it covers the scenarios that most often affect outcomes.

1) Claims that don’t actually rest on a written contract

If the underlying obligation is not documented in a way that satisfies the “written contract” characterization, the limitation period may differ. For example:

• an oral agreement,
• an implied arrangement without a written instrument, or
• a claim structured as tort or unjust enrichment rather than contract.

2) Different legal bases within the same dispute

A single business dispute can include multiple theories, such as:

• breach of contract,
• damages tied to contractual terms,
• recovery of sums documented in invoices (which may or may not be treated as contract-based, depending on context),
• claims related to guarantees or other written instruments.

Even when documents exist, the limitation period can change depending on what legal right the claim actually enforces.

3) Security instruments and enforcement documents

Some disputes involve written documents beyond the main contract (e.g., promissory notes, guarantees, or acknowledgments). These can sometimes lead to a different characterization than “written contract,” affecting the limitation period and the date from which it starts.

4) Practical evidence issues: proving the due date

Even where the limitation rule is clear on paper, proving the “due date” is often the deciding factor. If the agreement is ambiguous (e.g., “payment upon completion” without defining completion date), the limitation analysis may rely on evidence of when completion occurred or when performance became due.

Statute citation

Thailand’s limitation periods for contractual claims are governed by the Civil and Commercial Code (ประมวลกฎหมายแพ่งและพาณิชย์).

For written contracts, the limitation period is generally 10 years under the Civil and Commercial Code’s rules on prescription.

Because this page is designed as a practical tool landing page, it’s best to pair the calculation with careful review of:

• the contract clause stating payment/performance timing, and
• the nature of the claim (what legal right you are enforcing).

If you’re building a case timeline, treat the contract’s due date language as the anchor date for the calculator rather than the date of breach or dispute.

Use the calculator

DocketMath’s statute-of-limitations calculator helps you translate contract dates into an estimated limitation window for Thailand written-contract claims.

Inputs to enter (and why they matter)

Use the calculator at /tools/statute-of-limitations and provide inputs aligned to your contract:

• Contract type: select Written contract

  • This drives the default limitation period (10 years).
• Key due date: the date the payment/performance obligation became due

  • This acts as the limitation start date in most practical scenarios.
• Claim type: payment vs. performance (if the tool offers this)

  • This can shift which date you treat as “due.”
• Reference date (today’s date or filing date): the date you want to assess

  • This determines whether the claim is within the window.

Output: how to interpret results

The calculator typically returns:

• Limitation start date (based on your due date input)
• Limitation end date (start + limitation period)
• Status as of your reference date (e.g., within/expired)

How changing inputs changes the outcome

Check these “what-if” scenarios:

• If you move the due date forward by 3 years (e.g., completion/payment later than initially believed), the end date moves forward by about the same amount.
• If you assess on a later reference date, the claim may shift from “within time” to “expired.”
• If your claim is actually based on a different legal characterization than written contract, the limitation period may differ—meaning the calculator’s written-contract mode would not match your claim theory.

Quick checklist before you hit calculate

Related reading

• Choosing the right statute of limitations tool for Vermont — Tool comparison
• Statute of limitations in Singapore: how to estimate the deadline — How-to guide
• Choosing the right statute of limitations tool for Connecticut — Tool comparison