Short answer. Because the classification drives almost everything else — which court hears the case, how long the State has to prosecute, whether an accomplice or accessory is punished at all, and how much of a penalty follows an attempt. The class is fixed by the penalty the law attaches to the offence, not by how serious it feels.
What the law says
Grave felonies are those to which the law attaches the capital punishment or penalties which in any of their periods are afflictive, in accordance with Article 25 of this Code.
Revised Penal Code, Article 9 — Grave, Less Grave, Light Felonies. Read the full provision →
What the law says
Afflictive penalties: Reclusion perpetua, Reclusion temporal, Perpetual or temporary absolute disqualification, Perpetual or temporary special disqualification, Prision mayor.
Revised Penal Code, Article 25 — Scale Of Penalties. Read the full provision →
How the three classes are drawn
Article 9 of the Revised Penal Code sorts felonies by the penalty the law attaches to them, read against the scale in Article 25. Grave felonies are those carrying capital punishment or a penalty that is afflictive in any of its periods — reclusion perpetua, reclusion temporal, prision mayor and the perpetual or temporary disqualifications. Less grave felonies are those whose penalties are correctional in their maximum period, which covers prision correccional, arresto mayor, suspension and destierro. Light felonies are infractions punished by arresto menor or a fine, or both. Note that capital punishment appears in the scale but is not imposed today, its imposition having been prohibited by Republic Act No. 9346 in 2006.
The fine threshold, and which version of the Code you are reading
For light felonies the current fine ceiling is forty thousand pesos. That figure comes from Republic Act No. 10951 (2017), which revised the property values and fine amounts throughout the Revised Penal Code. This matters enormously in practice. Older reproductions of the Code — printed books, downloaded copies, many websites — still carry the 1930 amounts, and for offences such as theft and estafa they show thresholds of twelve thousand or twenty-two thousand pesos where the current figures run into the millions. Before relying on any peso amount in a criminal provision, check whether the source you are reading has been updated for RA 10951.
What the classification changes
The class is not a label; it has consequences running through the whole Code. The period within which the State may still prosecute depends on it, so a lighter class means the case can go stale sooner. Light felonies are punishable only in specific situations, and the liability of accomplices and accessories is treated very differently from that in grave and less grave felonies. Whether a conspiracy or a mere proposal is itself punishable, how attempted and frustrated stages are penalised, and which court has jurisdiction all trace back to the same starting point. So does the practical question of bail.
Working out your own case
Start from the exact provision charged in the information, not from the label used in the complaint or in conversation. Read the penalty that provision attaches, then place that penalty on the scale in Article 25 — that placement is the classification. Where a penalty spans classes, the article's wording about periods is what decides it, and that is genuinely technical. Check also that any peso figure in the charge reflects the amounts as amended in 2017, because charges built on the old thresholds occasionally still surface. This page is general legal information about how the Revised Penal Code classifies felonies; it does not tell you how your own charge will be treated, and no outcome can be promised.
Related provisions
- Revised Penal Code, Article 9 — Grave, Less Grave, Light Felonies
- Revised Penal Code, Article 25 — Scale Of Penalties