Short answer. Prisión correccional in its medium period and a fine of up to four hundred thousand pesos. Article 141 punishes persons who merely conspire to commit sedition, even before any sedition is carried out. The peso amount of the fine reflects the figures set by Republic Act No. 10951.
What the law says
Persons conspiring to commit the crime of sedition shall be punished by prisión correccional in its medium period and a fine not exceeding Four hundred thousand pesos (₱400,000).
Revised Penal Code, Article 141 — Conspiracy To Commit Sedition. Read the full provision →
Conspiracy to commit sedition is itself a crime
The law does not wait for sedition to break out before it acts. Article 141 makes the very agreement to commit sedition punishable, providing that persons conspiring to commit the crime of sedition shall be punished by prisión correccional in its medium period and a fine not exceeding Four hundred thousand pesos (₱400,000). So people who come to an agreement to rise publicly and tumultuously for the seditious ends the law defines can be prosecuted for the conspiracy alone, even if the planned sedition never takes place. The agreement to attack public order is treated as dangerous enough to punish on its own.
The penalty
The offense carries prisión correccional in its medium period, a term of imprisonment, together with a fine that may reach four hundred thousand pesos. The peso figure comes from Republic Act No. 10951, which in 2017 revised the monetary penalties throughout the Revised Penal Code; the current ceiling on the fine derives from that law rather than the Code's original amount. The combination of imprisonment and a substantial fine marks the seriousness with which the law regards an agreement aimed at seditious action.
What conspiracy means here
Conspiracy exists when two or more persons come to an agreement concerning the commission of a felony and decide to commit it. For sedition, that means agreeing to carry out the tumultuous, public actions against public authority that constitute the crime of sedition. It is the meeting of minds and the decision to pursue the seditious objective that the article punishes. Mere loose talk or abstract sympathy is not enough; there must be an actual agreement to commit the crime, decided upon by those who conspire.
Why the agreement alone is punished
Punishing conspiracy to commit sedition lets the law intervene before public disorder erupts, when the danger is still at the planning stage. Sedition threatens public order on a broad scale, so the State does not have to stand by until it happens; it can act against those who have agreed to bring it about. This reflects a general pattern in which the law, for the gravest offenses against the State, treats the conspiracy or proposal as a distinct crime, reaching the plotters before their plan matures into actual violence.