Current law. Three strikes came back into force on 17 June 2025 for 42 serious violent and sexual offences: a first strike is a warning, a second means no parole, and a third means the maximum sentence without parole (Ministry of Justice). A strike counts only where the sentence is over 12 months for a first strike, or over 24 months for a second or third (Ministry of Justice). Since 29 June 2025, discounts for an offender's personal circumstances have been capped at 40 per cent unless that would be manifestly unjust, and the maximum discount for a guilty plea falls on a sliding scale from 25 per cent to 5 per cent for a plea entered during the trial (Ministry of Justice). Since 21 November 2024 the Gangs Act has banned gang patches and insignia in public for 35 listed gangs, and allows police dispersal notices and court non-consorting orders (Ministry of Justice). In August 2026 Parliament passed new offences for assaulting first responders and prison officers, coward-punch offences, shoplifting infringement fees and a wider citizen's arrest power (1News). A child under 10 cannot be charged with any offence. From 10 a child can be charged with murder or manslaughter; at 12 or 13, with offences carrying a maximum of 14 years or more (10 years or more for a previous offender); and from 14, with any offence (NZ Police). Most charges are dealt with in the Youth Court, but murder and manslaughter cases move to the High Court (Youth Court).
Prisons. At 30 June 2026 there were 11,256 people in prison, 4,616 of them on remand awaiting trial or sentence (Corrections). A person serving a prison sentence cost an average of $552 a day in 2024/25 (Corrections). The Ministry of Justice projects the prison population will rise 35 percent, to 15,200 by June 2036, if nothing else changes, and says recent sentencing changes mean "more people will receive prison sentences, and for longer terms" (Ministry of Justice). A 596-bed unit opened at Waikeria Prison in June 2025, and an 810-bed expansion there is due in 2029 (Corrections).
Crime and youth offending. The government's target is 20,000 fewer victims of assault, robbery or sexual assault by 2029 (DPMC), from 185,000 in October 2023. The latest survey result is 147,577, which the government rates "On Track", though it notes the survey's margins of error are high (DPMC). Children and young people with serious and persistent offending fell from 1,100 in June 2023 to 814 in June 2026 (DPMC). In the military-style academy pilot, the final evaluation found 5 of 9 participants reduced how often and how seriously they offended, against 2 of 9 in a comparison group, and said larger numbers were needed for stronger conclusions; Oranga Tamariki said seven of the 10 participants reoffended (RNZ via ODT).
Advice and views. In 2018, before the 2024–26 changes, the Prime Minister's Chief Science Advisor's office reported that "there is no evidence of the supposed 'deterrent' effect of harsher sentences" and that prisons are "extremely expensive training grounds for further offending" (PMCSA). The Law Society opposed bringing back three strikes, saying "there is inadequate evidence to suggest that a three strikes sentencing regime provides general deterrence" (Law Society). Supporters of the changes, including the government, say longer sentences keep the public safer: when the sentencing changes passed in 2025, Justice Minister Paul Goldsmith said "Kiwis can now feel safer knowing serious criminals will spend longer in prison" (Beehive).
Related policies not compared here. Several parties have justice policies outside these five questions: sexual consent law (National and the Greens), family violence (ACT, the Greens and Opportunity), drug law (the Greens, Opportunity and Te Pāti Māori), firearms (ACT and the Greens) apart from rules aimed at gang members, and legal aid (the Greens and Te Pāti Māori). These are noted in each party's entry where relevant but not compared here.