Good conduct time

Good conduct time, good time credit, good time, or time off for good behavior is a sentence reduction given to prisoners who maintain good behavior while imprisoned. In Florida, it is known as gain time. Good conduct time can be forfeited if a prisoner is determined to have committed disciplinary infractions and/or crimes while incarcerated.

In the United States, the earliest versions of "good time" or "gain time" were in place by 1850 as an alternative "to corporal punishment to motivate offenders who were not willing to work as expected".^[1] The concept was in use by 38 states by 1890 and 46 states by 1910.^[1]

Good conduct time is intended to incentivize prisoners to comply with prison rules and refrain from committing additional crimes behind bars—especially acts of violence towards other inmates and prison guards—thereby ensuring that a prison can be run in a cost-effective manner with a higher ratio of inmates to guards. Prisoners known to be uncontrollably violent (i.e., who will immediately attempt to injure or kill any human being within reach if the opportunity arises) cannot share cells or other prison facilities and must be escorted in restraints by multiple guards.

Under United States federal law, prisoners serving more than one year in prison get 54 days a year of good conduct time on the anniversary of each year they serve plus the pro rata good time applied to a partial year served at the end of their sentence, at the rate of 54 days per year.^[2]. For sentences of under 1 year, good conduct time can waive as much as 50% of the original sentence.

Persistent controversy over calculation of good conduct time in the United States was laid to rest in the Supreme Court decision in Barber v. Thomas in 2010.^[3] The First Step Act, which provides for time credits for successful participation in recidivism reduction programs, also changes how the 54 days are calculated, applying a retroactive fix that could result in the release of 4,000 prisoners.^[4]