Section 3: Later law more favourable to the offender
Statutory text (Thai original)
ถ้ากฎหมายที่ใช้ในขณะกระทำความผิดแตกต่างกับกฎหมายที่ใช้ในภายหลังการกระทำความผิด ให้ใช้กฎหมายในส่วนที่เป็นคุณแก่ผู้กระทำความผิด ไม่ว่าในทางใด เว้นแต่คดีถึงที่สุดแล้ว แต่ในกรณีที่คดีถึงที่สุดแล้ว ดังต่อไปนี้ (๑) ถ้าผู้กระทำความผิดยังไม่ได้รับโทษ หรือกำลังรับโทษอยู่ และโทษที่กำหนดตามคำพิพากษาหนักกว่าโทษที่กำหนดตามกฎหมายที่บัญญัติในภายหลัง เมื่อสำนวนความปรากฏแก่ศาลหรือเมื่อผู้กระทำความผิด ผู้แทนโดยชอบธรรมของผู้นั้น ผู้อนุบาลของผู้นั้นหรือพนักงานอัยการร้องขอ ให้ศาลกำหนดโทษเสียใหม่ตามกฎหมายที่บัญญัติในภายหลัง ในการที่ศาลจะกำหนดโทษใหม่นี้ ถ้าปรากฏว่า ผู้กระทำความผิดได้รับโทษมาบ้างแล้ว เมื่อได้คำนึงถึงโทษตามกฎหมายที่บัญญัติในภายหลัง หากเห็นเป็นการสมควร ศาลจะกำหนดโทษน้อยกว่าโทษขั้นต่ำที่กฎหมายที่บัญญัติในภายหลังกำหนดไว้ถ้าหากมีก็ได้ หรือถ้าเห็นว่าโทษที่ผู้กระทำความผิดได้รับมาแล้วเป็นการเพียงพอ ศาลจะปล่อยผู้กระทำความผิดไปก็ได้ (๒) ถ้าศาลพิพากษาให้ประหารชีวิตผู้กระทำความผิด และตามกฎหมายที่บัญญัติในภายหลัง โทษที่จะลงแก่ผู้กระทำความผิดไม่ถึงประหารชีวิต ให้งดการประหารชีวิตผู้กระทำความผิด และให้ถือว่าโทษประหารชีวิตตามคำพิพากษาได้เปลี่ยนเป็นโทษสูงสุดที่จะพึงลงได้ตามกฎหมายที่บัญญัติในภายหลัง
English translation
If the law in force at the time of the commission of the offence differs from the law in force afterwards, the law in the part that is more favourable to the offender shall be applied, in whatever respect, except where the case has become final. But where the case has become final, the following shall apply:
(1) If the offender has not yet undergone the punishment, or is undergoing it, and the punishment fixed by the judgment is heavier than the punishment fixed under the law enacted afterwards, then, when it appears to the court from the record, or when the offender, the offender's legal representative, the offender's curator, or the public prosecutor applies, the court shall fix the punishment anew according to the law enacted afterwards. In fixing the punishment anew, if it appears that the offender has already undergone part of the punishment, the court may, having regard to the punishment under the law enacted afterwards and if it thinks fit, fix a punishment lower than the minimum punishment fixed by the law enacted afterwards, if any; or if the court is of the opinion that the punishment already undergone by the offender is sufficient, the court may release the offender.
(2) If the court has passed a sentence of death on the offender, and under the law enacted afterwards the punishment to be imposed on the offender does not extend to death, the execution of the death sentence shall be stayed, and the sentence of death under the judgment shall be deemed to have been changed into the highest punishment that may be imposed under the law enacted afterwards.
ThaiLawOnline translation, written from the Thai original and verified
Firm annotation
Section 3 governs the change of law where the offence remains an offence but the applicable penalty differs, complementing Section 2, which covers outright abolition. The core rule is that the more favourable law applies in whatever respect, so the offender takes the benefit whether the change touches the definition, the penalty range, or ancillary consequences. The two numbered paragraphs create narrow exceptions to the finality of judgments: paragraph (1) lets the court re-fix a penalty that exceeds the new maximum, on motion, and paragraph (2) automatically converts a death sentence to the new maximum. Because these are exceptions to finality, courts read the re-sentencing power strictly: it applies only where the final penalty is genuinely heavier than the ceiling of the later law.
Why this matters in practice
This is one of the most practically used general-part provisions, especially after major reforms such as the Narcotics Code replacing the older drugs law. A person already convicted can file a motion under 3(1) to have the penalty re-fixed to the lighter regime, but only if the final penalty actually exceeds the new maximum; a court will refuse the motion where that threshold is not met. The benefit is not automatic across the board: the more favourable law applies in whatever respect, but the exceptions to finality are limited to what paragraphs (1) and (2) allow. If a sentence was imposed before a favourable amendment, it is worth checking whether a re-sentencing motion is available.
Supreme Court decisions interpreting this section
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Supreme Court Judgment No. 875/2568 (2025)
Re-fixing a penalty under Section 3(1) is available only where the penalty imposed by the final judgment is heavier than the penalty fixed by the later law; otherwise the motion must be refused.
In a narcotics case, the Supreme Court considered whether there were grounds to re-fix the defendant's penalty under Section 3(1) and confirmed that the power applies only when the final penalty exceeds the ceiling of the later law.
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Supreme Court Judgment No. 7422/2568 (2025)
Where the penalty under the law in force at the time of the offence differs from and is heavier than the penalty under the later law, Section 3 requires the more favourable later law to apply in whatever respect.
The Supreme Court held that because the penalty under the old narcotics law was heavier than that under the new Narcotics Code, the more favourable new code applied under Section 3, and re-fixing the penalty accordingly did not offend the legality principle.
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Supreme Court Judgment No. 434/2568 (2025)
A motion to re-fix a penalty under Section 3(1) requires that the penalty fixed by the final judgment be heavier than the penalty provided by the later law.
The Supreme Court, in a narcotics case, restated that re-fixing a penalty under Section 3(1) is confined to cases where the final penalty is heavier than the penalty set by the later law.
Curated decisions with case numbers verified against the Supreme Court database. English renderings are the firm's editorial translation for study.
Cited in 526 Supreme Court decisions (1957 to 2026)
Selected citing decisions
- Decision 531/2569 (2026)
- Decision 65/2569 (2026)
- Decision 875/2568 (2025)
- Decision 2306/2567 (2024)
- Decision 246/2567 (2024)
- Decision 218/2567 (2024)
- Decision 3686/2566 (2023)
- Decision 3374/2566 (2023)
This list is selected automatically, weighted towards judgments that turn on this section rather than ones that merely recite it when passing sentence. It has not yet been reviewed by the firm.
Most often cited alongside
- Section 78 310
- Section 91 287
- Section 83 201
- Thai CrPC s. 225 174
- Section 29 170
- Thai CrPC s. 195 169
Sections that appear in the same judgments as this one most often. The figure is the number of decisions.
Counted across the firm's corpus of 83,652 Supreme Court decisions, 1921 to 2026. The count is complete; the stated year range trims rare outliers so it describes where the citations actually sit. These figures are computed by us and are not official court statistics. How we count these, and what we measured
Frequently asked questions
Can my sentence be reduced if the law becomes lighter after I am convicted?
Possibly. Under Section 3(1) you can ask the court to re-fix your penalty under the newer, lighter law, but only if the penalty in your final judgment is heavier than the maximum penalty the new law allows.
What is the difference between Section 2 and Section 3?
Section 2 applies when a later law abolishes the offence entirely. Section 3 applies when the offence still exists but the law differs, in which case the more favourable version is used.
What happens to a death sentence if the law later removes the death penalty for that offence?
Under Section 3(2), the death sentence is deemed changed to the highest penalty that the later law fixes for that offence.
Related guides on ThaiLawOnline
Cite this section
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Plain citation
Penal Code, s. 3 (Thailand) -
Academic citation
Penal Code (Thailand), s. 3. ThaiLawOnline, https://www.thailawonline.com/thai-penal-code/section-3/ (accessed 17 August 2026). -
Thai citation
ป.อ. มาตรา 3 -
Permalink
https://www.thailawonline.com/thai-penal-code/section-3/ -
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<blockquote cite="https://www.thailawonline.com/thai-penal-code/section-3/"><p>If the law in force at the time of the commission of the offence differs from the law in force afterwards, the law in the part that is more favourable to the offender shall be applied, in whatever respect, except where the case has become…</p><footer>Penal Code, s. 3 (Thailand) — <a href="https://www.thailawonline.com/thai-penal-code/section-3/">ThaiLawOnline</a></footer></blockquote>
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