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Child sex offences committed by children or young persons

The offence under s.13 Sexual Offences Act 2003, committed by a person under 18 who does anything that would be an offence under ss.9-12 if they were 18 or over — the statutory elements (points to prove) reproduced verbatim, mode of trial and maximum sentence, and the arrest power, for frontline officers.

Unofficial independent resource — always verify with official sources (College of Policing, your force, PFEW).

Last reviewed: 28 August 2026 · Next review due: 28 February 2027

Reviewed by BlueLineHub Editorial

What is the offence under s.13 Sexual Offences Act 2003 committed by children or young persons?

s.13(1) Sexual Offences Act 2003: a person under 18 commits an offence if they do anything that would be an offence under any of ss.9-12 Sexual Offences Act 2003 if they were aged 18 or over, reproduced verbatim below.

The offence is triable either way; the maximum on conviction on indictment is 5 years' imprisonment, with a maximum of 6 months on summary conviction (s.13(2)) — a single reduced maximum that applies regardless of which of ss.9-12 the conduct would otherwise fall under.

All offence cards

s.13(1) Sexual Offences Act 2003 provides that a person under 18 commits an offence if they do anything which would be an offence under any of ss.9-12 (sexual activity with a child, causing or inciting a child to engage in sexual activity, engaging in sexual activity in the presence of a child, or causing a child to watch a sexual act) were they aged 18 or over. The offence is reproduced verbatim below. It is educational reference, not a charging decision — verify against current law, CPS charging guidance and force policy.

Offence

s.13 Sexual Offences Act 2003

Mode of trial

Triable either way

Maximum sentence

5 years' imprisonment on conviction on indictment; 6 months on summary conviction (s.13(2)).

Points to prove — statutory elements

Reproduced verbatim from the Act as published on legislation.gov.uk. These are the statutory elements, not a paraphrase — confirm the up-to-date text and any amendments at the source.

The summary penalty reproduced below refers to 'a fine not exceeding the statutory maximum'. Since section 85 of the Legal Aid, Sentencing and Punishment of Offenders Act 2012 (in force 12 March 2015) that summary fine is UNLIMITED. The '6 months' summary custodial figure (s.13(2)) is current.
s.13 — Child sex offences committed by children or young personsthe offence

(1) A person under 18 commits an offence if he does anything which would be an offence under any of sections 9 to 12 if he were aged 18.

(2) A person guilty of an offence under this section is liable—

(a) on summary conviction, to imprisonment for a term not exceeding 6 months or a fine not exceeding the statutory maximum or both;

(b) on conviction on indictment, to imprisonment for a term not exceeding 5 years.

Read s.13 on legislation.gov.uk

Powers of arrest & search

Arrest without warrants.24

A constable may arrest without warrant anyone whom they have reasonable grounds to suspect of committing this offence, where an arrest is necessary on one of the s.24(5) grounds (PACE 1984 s.24). There is no separate statutory power of arrest in the Sexual Offences Act 2003 for this offence. Because the suspect is by definition under 18, the arrest and any subsequent detention engage the youth arrest and appropriate-adult framework — force policy on dealing with a child suspect applies from the point of arrest.

Code of Practice: PACE Code G — arrest →

CPS charging guidance

Verbatim extracts from the CPS charging guidance (Crown copyright, reproduced under the Open Government Licence v3.0). CPS revises this guidance — confirm against the live page and current law.

Offences against children under 16 (sections 9 - 13)ss.9-13 — key points & charging practice

The 2003 Act provides that the age of consent is 16. Sections 9 -13 clarify that any sexual activity involving consenting children under 16 is unlawful. Sections 9-12 cover adult defendants. Section 13 relates to child defendants.

Section 9 Sexual activity with a child

Section 10 Causing or inciting a child to engage in sexual activity

Section 11 Engaging in sexual activity in the presence of a child

Section 12 Causing a child to watch a sexual act

Key Points:

Consent is irrelevant.

There is a defence of reasonable belief that the child is 16 years or over. The defence of reasonable belief does not apply if the child is under 13 years.

There is no defence for lawfully married overseas couples where one party is under 16.

Sections 9 and 10 create two separate offences of penetrative and non-penetrative sexual activity. If penetration is involved the offence is indictable only. The maximum sentence on indictment is 14 years.

Sections 11 and 12 are either way offences which attract a maximum sentence of 10 years imprisonment.

Under section 11, there is no requirement that the complainant is actually aware of the activity, though there is a requirement that the complainant is present, or could potentially observe it. Observation can be via a webcam and includes an image.

In accordance with section 13 a person under 18 commits an offence if he does anything which would amount to an offence under sections 9-12.

Charging Practice:

When there is an absence of consent, and an absence of reasonable belief in consent, offences contrary to sections 1-4 are also available. However, prosecutors should always have regard to available sentencing options.

Where there is a clear complaint of rape of a child aged 13-15, then a charge of section 1 (rape) should always be preferred to a charge of section 9 (sexual activity with a child). Section 9 should only be considered when the prosecutor concludes that it will not be possible to prove an absence of consent. Prosecutors should be alert to the need for careful consideration of factors such as the presence of coercion, exploitation, and grooming when assessing whether or not the child freely consented.

In cases where there is clear evidence of a familial relationship, offences contrary to section 25 or section 26 (familial child sex offences) should be considered rather than sections 9 or 10.

This section should be read alongside chapter 9 Allegations involving children and young people.

Read on cps.gov.uk
Offences against children under 16 (sections 9 - 13)s.13 — under-18 offender, 5-year cap

Key Points:

Pursuant to section 13 SOA 2003 it is an offence if a person under 18 commits an act which would amount to an offence under sections 9 - 12.

Pursuant to section 13 the maximum penalty on indictment is reduced to imprisonment to a term not exceeding 5 years.

Prosecutors must also apply the Code and any relevant CPS policies.

Where both the suspect and complainant are under 13 years of age any charging decision or subsequent decision to terminate proceedings or substantially alter the charge should be approved by the Chief Crown Prosecutor (CCP).

Read on cps.gov.uk
Offences against children under 16 (sections 9 - 13)factors in the charging decision for ss.5–13 — prosecutorial discretion, not a defence or element

In deciding whether or not to prosecute offences contrary to Sections 5-13 SOA 2003, prosecutors should have careful regard to the factors below. The weight to be attached to a particular factor will vary depending on the circumstances of each case. However, when deciding whether it is the public interest to prosecute, prosecutors may exercise more discretion in relation to child sex offences where the complainant is aged 13 - 15 than for those offences where the child is under 13 years.

Prosecutors should have regard to the following factors:

The age and understanding of the offender. This may include whether the offender has been subjected to any exploitation, coercion, threat, deception, grooming or manipulation by another which has led him or her to commit the offence;

The relevant ages and levels of maturity of the parties, that is, the same or no significant disparity in age;

Whether the complainant entered into sexual activity willingly, that is, did the complainant understand the nature of his or her actions and that (s)he was able to communicate his or her willingness freely;

Parity between the parties in regard to sexual, physical, emotional and educational development;

The relationship between the parties, its nature and duration and whether this represents a genuine transitory phase of adolescent development;

Whether there is any element of exploitation, coercion, threat, deception, grooming, seduction, manipulation or breach of trust in the relationship;

Whether the child under 13 freely consented (even though in law this is not a defence) or a genuine mistake as to her/his age was in fact made;

The nature of the activity, for example, penetrative or non-penetrative activity;

The sexual and emotional maturity of the parties and any emotional or physical effects resulting from the conduct; and

The likely impact of any prosecution on the parties.

Read on cps.gov.uk
Child sex offences committed by children or young persons (ss.9-12, offender under 18) — Sentencing Council guidelineLegislation Quick Reference
  • s.13 is the vehicle used where the alleged offender is themselves under 18 — the equivalent conduct against an adult offender (aged 18 or over) is charged under whichever of ss.9-12 applies, not under s.13.
  • s.13(2) sets a single 5-year maximum on indictment regardless of which of ss.9-12 the conduct would otherwise fall under and regardless of penetration — the higher maxima and indictable-only mode attaching to some forms of ss.9-12 for an adult offender do not carry over.
  • This is not a consent offence — ss.74-76 do not apply. The age structure is inherited from the ss.9-12 conduct it mirrors: a reasonable-belief-in-age defence exists only where the other person is aged 13-15; there is no such defence where they are under 13.
  • Sentence is assessed with regard to the Sentencing Council's overarching 'Sentencing Children and Young People' guideline, which applies to a defendant who was under 18 at the date of the finding of guilt.
  • Both parties to the alleged conduct may themselves be under 16 — CPS charging discretion and the public interest are especially significant in deciding whether to charge under s.13.
  • A conviction under s.13 does not automatically attract the same notification ('sex offender registration') consequences as the equivalent adult offence — many s.13 outcomes fall below the notification threshold set out in Part 2 Sexual Offences Act 2003; this depends on the sentence actually imposed and must be checked against the current notification criteria.

Related reading

Primary sources

BlueLineHub is independent and unofficial. Always verify with the authoritative source below.

  • Sexual Offences Act 2003, section 13 — child sex offences committed by children or young persons

    The offence: a person under 18 commits an offence if they do anything that would be an offence under any of ss.9-12 if they were aged 18 or over, and the mode of trial and maximum sentence in s.13(2).

    Last checked: August 2026
    Verify on official source
  • Legal Aid, Sentencing and Punishment of Offenders Act 2012, section 85 — removal of limit on certain fines

    In force from 12 March 2015, this removes the cap on the fine a magistrates' court may impose for offences whose penalty is expressed as 'the statutory maximum', including s.13(2).

    Last checked: August 2026
    Verify on official source
  • Police and Criminal Evidence Act 1984, section 24 — arrest without warrant: constables

    The power of arrest without warrant, subject to the necessity criteria in s.24(5).

    Last checked: August 2026
    Verify on official source
  • Sentencing Council — Child sex offences committed by children or young persons (ss.9-12) guideline

    The Sentencing Council guideline used to assess sentence for offences under s.13.

    Last checked: August 2026
    Verify on official source
  • CPS Rape and Sexual Offences prosecution guidance — Chapter 8: Key Legislation and Offences (Open Government Licence v3.0)

    CPS charging guidance for Sexual Offences Act 2003 offences — the verbatim extracts shown on this card.

    Last checked: October 2026
    Verify on official source

Frequently asked

Does s.13 carry the same maximum sentence as ss.9-12?
No. s.13(2) sets a single, reduced maximum of 5 years' imprisonment on conviction on indictment, regardless of which of ss.9-12 the conduct would otherwise fall under and regardless of penetration. The higher maxima (up to 14 years or life) that attach to some forms of ss.9-12 for an adult offender do not apply to a s.13 offender.
Who is charged under s.13 rather than ss.9-12?
s.13 applies only where the alleged offender is themselves under 18 at the time of the conduct. Where the alleged offender is aged 18 or over, the conduct is charged under whichever of ss.9-12 applies.
Is there a reasonable-belief-in-age defence under s.13?
The age structure is inherited from the ss.9-12 conduct s.13 mirrors: a reasonable-belief-in-age defence exists only where the other person is aged 13-15. There is no such defence where the other person is under 13.