Youth-to-Adult Sentencing for Rape: Proper Use of Adult Guidelines and the “Half to Two-Thirds” Approach

Introduction

In R v Khalaf [2026] EWCA Crim 880, the England and Wales Court of Appeal (Criminal Division) (Lord Justice Dingemans, Mr Justice Garnham and Mrs Justice Heather Williams DBE) dismissed an appeal against sentence arising from sexual offending committed when the appellant was 15, but sentenced after he had turned 18. The appeal required the Court to examine how the Sentencing Council framework for children and young people interacts with adult sentencing powers and adult offence guidelines—especially the extent of any reduction from an “adult-equivalent” sentence.

The appellant had been convicted in the Youth Court of rape (Sexual Offences Act 2003, s.1), disclosing private sexual photographs/films with intent to cause distress (Criminal Justice and Courts Act 2015, s.33), sexual assault (Sexual Offences Act 2003, s.3), and possession of indecent photographs of a child (Criminal Justice Act 1988, s.160). He was committed to the Crown Court for sentence under s.16 of the Sentencing Act 2020, and was sentenced by HHJ Nathan Adams to 4 years 6 months’ detention in a young offender institution for rape, with concurrent shorter terms for the other offences, plus a 10-year restraining order.

A further contextual feature was the statutory lifetime anonymity regime for complainants in sexual cases under the Sexual Offences (Amendment) Act 1992, noted expressly by the Court at the outset.

Summary of the Judgment

  • The Court held that the judge did apply Step 3 of the Sexual Offences – Sentencing Children and Young People guideline (personal mitigation and whether custody is necessary).
  • The judge was entitled to identify an adult-equivalent sentence of about 9 years’ custody (adult rape guideline Category 2B, with allowance for additional offences).
  • The judge’s reduction to half (resulting in 4 years 6 months) accorded with the Sentencing Children and Young People – Overarching Principles guideline, especially paragraph 6.46.
  • The Court clarified that paragraph 6.46 does not contemplate a “two-thirds reduction”; rather it indicates (as a non-mechanical guide) a sentence of roughly one-half to two-thirds of the adult sentence.
  • The sentence was not manifestly excessive; the appeal was dismissed.

Analysis

Precedents Cited

The judgment did not turn on previously-decided appellate authorities; instead, it was driven by structured application of Sentencing Council guidelines and the relevant statutory framework. The principal materials were:

  • Sexual Offences – Sentencing Children and Young People guideline (the step-based methodology: seriousness, factors, personal mitigation/necessity of custody, and final review).
  • Sentencing Children and Young People – Overarching Principles guideline, especially:
    • Paragraphs 6.1–6.2: where an offender has crossed an age threshold (e.g., turned 18), the “starting point” remains the sentence likely at the time of offending, while recognising that adult purposes of sentencing apply once 18.
    • Paragraph 6.45: where custody is unavoidable, the court may consult the adult offence guideline.
    • Paragraph 6.46: the “rough guide” that for ages 15–17 the court may feel it appropriate to impose a sentence broadly within one-half to two-thirds of the adult sentence (not mechanistic; developmental age matters).
  • The adult rape guideline (used as a benchmark once the youth guideline indicated custody and permitted consultation of adult guidance).

Legal Reasoning

The Court’s reasoning proceeded in three linked steps which, together, amount to the key practical guidance emerging from the case.

1) Step 3 was not skipped: the “custody is necessary” judgment was made

The appellant argued the judge failed to apply Step 3 (personal mitigation and whether custody is necessary), thereby inflating the starting point. The Court rejected this: the sentencing remarks showed the judge considered maturity, background, and the PSR (including continued denial and lack of insight), and then explained why only custody met the seriousness of the offending.

2) Using the adult guideline as a benchmark was legitimate once custody was crossed

The youth guideline expressly contemplates (Overarching Principles, paragraph 6.45) consulting the adult guideline where custody is inevitable. Having concluded custody was required, the judge located the rape within adult Category 2B, producing an adult starting point of 8 years (range 7–9), and then arrived at a notional adult outcome of around 9 years in light of the additional offending. The Court held this was within the judge’s entitlement and did not involve an impermissible “double counting” of the blackmail element; rather, it was part of the seriousness assessment and the overall picture.

3) The reduction for youth was correctly understood: “half to two-thirds of adult”, not “two-thirds off”

A central point in the appeal was the size of the discount for age. The Court treated paragraph 6.46 as important guard-rails: it indicates a sentence of about one-half to two-thirds of the adult figure for a 15–17 year old—subject to an individualised, non-mechanical evaluation of developmental maturity.

The Court therefore endorsed the judge’s choice of a 50% reduction from the notional adult sentence (9 years → 4 years 6 months), and also explained why the appellant’s later progress on an Intensive YRO did not materially alter that outcome: the PSR indicated that the YRO assessments did not take account of the index sexual offences and the appellant still showed a marked lack of insight into those offences and associated risk.

Impact

The decision’s likely influence is practical and methodological rather than doctrinal:

  • Clarification of paragraph 6.46: appellate confirmation that it does not suggest a “two-thirds reduction”, but a final sentence typically landing in a band of one-half to two-thirds of the adult benchmark, subject to individual maturity.
  • Reassurance on adult-guideline benchmarking: where a youth offender is sentenced after turning 18 and custody is inevitable, judges may use adult guidelines as a reference point, provided the youth guideline structure is still followed.
  • Limits of post-offence progress: progress in other disposals (such as a later YRO for unrelated matters) may carry less weight where it did not address the index sexual offending and where denial/lack of insight remains relevant to risk and rehabilitation.

Complex Concepts Simplified

  • “Step-based” youth guideline: the court first assesses seriousness (Step 1), then aggravating/mitigating offence factors (Step 2), then personal mitigation and whether custody is necessary (Step 3), and finally “stands back” to ensure the overall sentence fits the child/young person (Step 5).
  • “Adult-equivalent” sentence: not the sentence actually imposed on the child, but a reference point derived from adult guidelines to help calibrate the youth sentence once custody is unavoidable.
  • “One-half to two-thirds”: a guideline-based rough band for the final custodial term for 15–17 year olds when compared to an adult benchmark. It is not a fixed formula and should not be applied mechanically.
  • “Manifestly excessive”: the appellate test is not whether another judge might have imposed a lower sentence, but whether this sentence fell outside the range of reasonable sentencing outcomes.

Conclusion

[2026] EWCA Crim 880 confirms that, when sentencing serious sexual offending committed at 15–17 but sentenced after 18, a court may: (i) follow the youth sexual offences guideline steps (including a real Step 3 necessity-of-custody assessment), (ii) consult the adult guideline once custody is crossed, and (iii) adopt a substantial but non-mechanical youth reduction, with paragraph 6.46 properly understood as pointing to a sentence around one-half to two-thirds of the adult benchmark, not a “two-thirds discount”.