Section 54: Order of increase and reduction
Statutory text (Thai original)
ในการคำนวณการเพิ่มโทษหรือลดโทษที่จะลง ให้ศาลตั้งกำหนดโทษที่จะลงแก่จำเลยเสียก่อนแล้วจึงเพิ่มหรือลด ถ้ามีทั้งการเพิ่มและการลดโทษที่จะลง ให้เพิ่มก่อนแล้วจึงลดจากผลที่เพิ่มแล้วนั้น ถ้าส่วนของการเพิ่มเท่ากับหรือมากกว่าส่วนของการลด และศาลเห็นสมควรจะไม่เพิ่มไม่ลดก็ได้
English translation
In calculating the increase or reduction of the punishment to be imposed, the court shall first fix the punishment to be imposed on the defendant and then increase or reduce it. If there is both an increase and a reduction of punishment, the increase shall be made first and then the reduction shall be made from the result already increased. If the portion increased is equal to or greater than the portion reduced, the court may make neither the increase nor the reduction.
This English translation is provided for reference only and has not yet been firm-verified. Always rely on the Thai original.
Firm annotation
Section 54 sets the method and sequence for adjusting a sentence. The court must first fix the base punishment to be imposed, and only then apply any increase and any reduction. Where both apply, the order is mandatory: increase first, then reduce from the already increased figure. As a simplifying rule, if the portion to be increased is equal to or greater than the portion to be reduced, the court may decline to do either. This procedural discipline links the enhancement provisions (such as Section 92) with the mitigation provisions (such as Section 78), and the courts treat an error in this sequence as a sentencing defect they may correct.
Why this matters in practice
The sequence matters to the final number, because increasing first and then reducing from the raised figure produces a different result than doing it the other way. In practice, where a recidivism increase and a mitigation reduction are the same proportion, courts often apply neither, leaving the base term intact. Because these arithmetic steps are frequently the subject of appeals, defendants should check that the judgment fixed the base penalty first and applied increase before reduction.
Supreme Court decisions interpreting this section
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Supreme Court Judgment No. 3704/2567 (2024)
Under Section 54 the court must first fix the punishment to be imposed and only then apply the increase; increasing before fixing the base term is incorrect and may be revised.
The Supreme Court corrected the sentencing method, holding that under Section 54 the trial court had to fix the punishment first and then increase it by one-half, and revised the judgment to follow that order.
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Supreme Court Judgment No. 802/2567 (2024)
Under Section 54, in calculating a reduction the court first fixes the punishment, then calculates the portion to be reduced and deducts it from the fixed term.
The Supreme Court en banc explained that under Section 54 the punishment is fixed first, then the reduction portion is calculated and deducted, so a one-third reduction of a four-year term is one year four months, leaving two years eight months.
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Supreme Court Judgment No. 5873/2567 (2024)
Section 54 requires the court first to fix the punishment, then to increase it, then to reduce from the increased figure. Where a one-third increase is followed by a one-third reduction, the two amounts are not equal, so the court may not treat them as equal and decline to make either adjustment.
The Court of Appeal Region 2 fixed ten years' imprisonment, then treated the one-third increase for recidivism as equal to the one-third mitigation reduction and made neither, leaving ten years. The Supreme Court held that contrary to Section 54: increasing ten years by one third and then reducing the result by one third gives eight years, ten months and twenty days, so the two were not equal and both adjustments had to be made.
Curated decisions with case numbers verified against the Supreme Court database. English renderings are the firm's editorial translation for study.
Cited in 30 Supreme Court decisions (1967 to 2024)
Selected citing decisions
- Decision 3704/2567 (2024)
- Decision 2754/2556 (2013)
- Decision 7235/2553 (2010)
- Decision 8432/2550 (2007)
- Decision 2820/2550 (2007)
- Decision 1438/2549 (2006)
- Decision 2076/2545 (2002)
- Decision 7329/2543 (2000)
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 27
- Section 92 14
- Section 83 11
- Section 91 11
- Section 288 9
- Section 33 6
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
In what order does a Thai court increase and reduce punishment?
Under Section 54 the court first fixes the punishment, then increases it, then reduces from the increased figure. The increase always comes before the reduction.
What if the increase and the reduction are the same size?
Under Section 54, if the portion to be increased is equal to or greater than the portion to be reduced, the court may make neither the increase nor the reduction.
Related guides on ThaiLawOnline
Cite this section
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Plain citation
Penal Code, s. 54 (Thailand) -
Academic citation
Penal Code (Thailand), s. 54. ThaiLawOnline, https://www.thailawonline.com/thai-penal-code/section-54/ (accessed 21 August 2026). -
Thai citation
ป.อ. มาตรา 54 -
Permalink
https://www.thailawonline.com/thai-penal-code/section-54/ -
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<blockquote cite="https://www.thailawonline.com/thai-penal-code/section-54/"><p>In calculating the increase or reduction of the punishment to be imposed, the court shall first fix the punishment to be imposed on the defendant and then increase or reduce it. If there is both an increase and a reduction of punishment, the increase shall…</p><footer>Penal Code, s. 54 (Thailand) — <a href="https://www.thailawonline.com/thai-penal-code/section-54/">ThaiLawOnline</a></footer></blockquote>
The Thai text is authoritative. The English is an unofficial translation by ThaiLawOnline, free to reuse with attribution.