California statutory rape law, codified at Penal Code 261.5, makes it a crime to have sexual intercourse with anyone under 18 who is not your spouse. The minor’s willingness is legally irrelevant. Penalties run from a misdemeanor with up to six months in county jail to a felony carrying up to four years, and the deciding factor is almost always the age gap between the two people. A significant change took effect on January 1, 2026: certain felony convictions under this statute now trigger sex offender registration.
What the Law Prohibits
To convict under Penal Code 261.5, prosecutors must prove three things: that sexual intercourse occurred, that the two people were not married to each other, and that one of them was under 18 at the time.1California Legislative Information. California Penal Code 261.5 – Unlawful Sexual Intercourse California’s age of consent is 18, with no close-in-age exception. Even when both participants are minors, the act still violates the statute.
This is a strict-liability offense as to age. The prosecution does not need to prove the defendant knew the other person was underage, and the minor’s agreement to the act does not matter. Anyone under 18 is treated as legally incapable of consenting to sexual intercourse, regardless of maturity or circumstances.
How the Age Gap Sets the Charge
The gap between the defendant’s and the minor’s ages controls whether the case is filed as a misdemeanor, a felony, or a “wobbler” the prosecutor can charge either way. The statute creates three tiers.
- Three years or less apart (subdivision b): always a misdemeanor. A 19-year-old and a 17-year-old fall here.2California Legislative Information. California Code PEN 261.5 – Unlawful Sexual Intercourse
- More than three years apart (subdivision c): a wobbler. The prosecutor chooses between misdemeanor and felony based on the facts.2California Legislative Information. California Code PEN 261.5 – Unlawful Sexual Intercourse
- Defendant 21 or older, minor under 16 (subdivision d): also a wobbler, but with steeper felony penalties.2California Legislative Information. California Code PEN 261.5 – Unlawful Sexual Intercourse
The gap is measured at the time of the offense, not the time of arrest or trial. A single day past a birthday threshold can move the case into a different tier.
Criminal Penalties
Misdemeanor Sentences
For close-in-age cases under subdivision (b), the statute itself sets no specific jail term. California’s general misdemeanor sentencing law fills the gap: up to six months in county jail, a fine of up to $1,000, or both.3California Legislative Information. California Penal Code 19 – Misdemeanor Punishment When a wobbler under subdivision (c) or (d) is charged as a misdemeanor, the sentence can reach one year in county jail.2California Legislative Information. California Code PEN 261.5 – Unlawful Sexual Intercourse
Felony Sentences
Felony sentencing depends on the subdivision. Under subdivision (c), the felony term follows California’s default framework of 16 months, two years, or three years.4California Legislative Information. California Penal Code 1170(h) – Sentencing Under subdivision (d), the statute sets a harsher triad of two, three, or four years.2California Legislative Information. California Code PEN 261.5 – Unlawful Sexual Intercourse
Where the time is served depends on registration status. Most non-violent, non-serious felonies are served in county jail under California’s realignment law. Defendants required to register as sex offenders serve their sentences in state prison instead.4California Legislative Information. California Penal Code 1170(h) – Sentencing After the 2026 registration change described below, that distinction now decides prison versus jail for many 261.5 defendants.
Civil Penalties
The statute also authorizes civil penalties that scale with the age gap, separate from any criminal fine. Under subdivision (e), the ceilings are:
- Minor less than two years younger: up to $2,000
- Minor at least two years younger: up to $5,000
- Minor at least three years younger: up to $10,000
- Adult over 21, minor under 16: up to $25,0001California Legislative Information. California Penal Code 261.5 – Unlawful Sexual Intercourse
Because these penalties are civil, a separate proceeding can impose them even if the criminal case ends in a lesser charge or an acquittal.
The 2026 Sex Offender Registration Change
Before January 1, 2026, a conviction under Penal Code 261.5 generally did not trigger mandatory sex offender registration. That has changed. For offenses committed on or after January 1, 2026, felony convictions under subdivision (c) or subdivision (d) now require registration under Penal Code 290.5California Legislative Information. California Penal Code 290 – Sex Offender Registration Act
There is an important carve-out. Registration is not required if the defendant was no more than 10 years older than the minor at the time of the offense and the conviction is the defendant’s only registrable offense.5California Legislative Information. California Penal Code 290 – Sex Offender Registration Act Even where the automatic requirement does not apply, a court can still order registration case by case under Penal Code 290.006. Misdemeanor convictions under subdivision (b) are not covered by the new requirement.
The practical stakes are large. Registration affects housing, employment, and residency restrictions for years. Anyone facing a felony charge under 261.5 for conduct on or after January 1, 2026, should treat registration as a live risk that was not present under prior law.
Defenses
Because 261.5 is a strict-liability crime based on age, the defense options are narrower than for most criminal charges. A few defenses still exist.
Reasonable mistake of age. California is one of the few states that recognizes this defense. If the defendant honestly and reasonably believed the minor was 18 or older, that belief can be raised at trial. The mistake must be one an average person in the same situation would have made; a bare “I didn’t know” is not enough. The defense is generally unavailable when the minor is under 14.
No sexual intercourse occurred. The statute covers intercourse specifically. If the prosecution cannot prove that act, the 261.5 charge fails. Other sexual conduct with a minor is covered by different statutes.
Marriage. The statute applies only to intercourse with someone “who is not the spouse of the perpetrator.”1California Legislative Information. California Penal Code 261.5 – Unlawful Sexual Intercourse If the parties were legally married at the time, 261.5 does not apply. California permits marriage for minors only with parental consent and a court order in limited circumstances.
False accusation. As with any criminal charge, the defense can argue the allegation is fabricated. This is a factual defense that turns on the credibility of the accuser and the physical evidence.
How Long Prosecutors Have to File Charges
The deadline depends on classification. For felonies punishable under Penal Code 1170(h), the general limitations period is three years from the date of the offense.6California Legislative Information. California Penal Code 801 – Statute of Limitations For misdemeanors, the limit is one year.7California Legislative Information. California Penal Code 802 – Statute of Limitations for Misdemeanors A DNA exception under Penal Code 803 can extend the deadline: when DNA evidence is collected and analyzed within two years of the offense and identifies a suspect, prosecutors get an additional year from identification to file. Once the period expires, the case cannot move forward regardless of the evidence.
How 261.5 Differs From Rape Under Penal Code 261
Statutory rape under 261.5 and rape under Penal Code 261 target different conduct. Penal Code 261 covers sexual intercourse accomplished through force, threats, intoxication, unconsciousness, or fraud.8California Legislative Information. California Penal Code 261 – Rape The focus is on the absence of meaningful consent, regardless of the victim’s age. Penal Code 261.5 focuses solely on the victim’s age.
Rape under Penal Code 261 is always a felony, carries sentences of three, six, or eight years in state prison, requires mandatory sex offender registration, and counts as a strike offense under California’s Three Strikes law. A conviction under 261.5, depending on the tier, may be a misdemeanor with no prison time at all. When force is used against a minor, prosecutors can and often do charge both statutes; one addresses the victim’s age, the other the manner in which the act was accomplished.
Immigration Consequences for Non-Citizens
A conviction under Penal Code 261.5 can create serious immigration problems. Under the Immigration and Nationality Act, “sexual abuse of a minor” is classified as an aggravated felony, which triggers mandatory deportation and bars most forms of immigration relief. Whether a particular 261.5 conviction qualifies depends on the subdivision and the age gap; federal courts have held that statutory rape laws must require a minimum age difference to meet the federal definition. A felony conviction under subdivision (c) or (d) is more likely to be treated as an aggravated felony than a misdemeanor under subdivision (b).
Even when a conviction does not meet the aggravated felony threshold, it may still qualify as a crime involving moral turpitude, which carries its own deportation and inadmissibility consequences. Non-citizens facing any charge under 261.5 should consult an immigration attorney before entering a plea. The immigration outcome can be more consequential than the criminal sentence itself.