By Kate Bryan, Rachel Schmidt, and Ashley Neufeld, with support from Nikki Miguel and Maura McNamara.

Michigan’s sentencing structure remains among the most restrictive in the nation. While many states have adopted policies that allow earned-time credits and provide opportunities for early release or resentencing, Michigan requires individuals to serve 100 percent of their minimum sentence before parole eligibility. While recent reforms, such as record clearing, medical parole, and limits to pretrial detention, have advanced progress to the state’s system, they do not target the key challenge of long lengths of stay. Today, more than 65 percent of the state’s prison population is serving a sentence of ten years or more, with limited opportunity for review or reduction. As the prison population rises for the first time in a decade, coupled with the state’s mounting budget pressures, a comprehensive examination of the state’s length of stay challenges is necessary. The goal of this brief is to serve as a baseline to begin that deeper examination. The Crime and Justice Institute, supported by Arnold Ventures, analyzed Michigan’s publicly available prison population data to understand the key trends regarding length of stay. Key findings include: Population growth: The prison population is growing after decades of decline, up 3% since 2021, with more individuals receiving additional sentences while already incarcerated. Sentences are getting longer: Average minimum terms rose 30% in the past decade, from 9.3 years (2014) to 12 years (2023). Drug offenses saw sharpest increases: Average minimum terms for drug offenses grew 33% over  the past decade. Sentencing practices exceeding statutory maximums: Data show minimum terms beyond statutory maximums for top offenses indicating the impacts of habitual offender enhancements, consecutive sentences, and additional sentencing stacking. With the urgency of a now rising population, the reinstated Sentencing Commission provides a renewed opportunity for the state to review sentencing practices. As Michigan prepares for leadership changes in 2026, the state has an opportunity to tackle its most pressing criminal justice challenge. To advance reform, Michigan must: Leverage the Sentencing Commission to produce data-driven recommendations and introduce corresponding legislation. Use corrections data to identify policies contributing to long stays, especially those related to enhancements, habitual offenders, and additional sentences imposed on already incarcerated individuals. Analyze the fiscal impact of long sentences considering recent budget volatility and an aging prison population. Reintroduce policies to reduce length of stay early in the 2026 session, backed by fiscal and public safety data.

Boston: Crime and Justice Institute, 2026. 17p.