Maryland diminution credits let most incarcerated people shorten their sentence by earning up to 20 or 30 days per calendar month for good behavior, work assignments, education, and approved special projects, with additional one-time bonuses for completing school milestones. The credits subtract directly from the sentence, pulling the mandatory supervision release date forward and, for life sentences, moving up the first parole consideration.
Who Can Earn Credits
Almost everyone committed to the custody of Maryland’s Commissioner of Correction starts earning credits from day one, whether it is an initial commitment or a return after a parole revocation.1Maryland General Assembly. Maryland Correctional Services Code 3-702 – Diminution of Confinement If you are serving a concurrent Maryland sentence while physically held in another state, credits do not begin accumulating until you arrive in Maryland.2Maryland General Assembly. Maryland Correctional Services Code 3-703
A short list of convictions is excluded entirely. Anyone serving time for rape or a sexual offense against a child under 16 cannot earn any diminution credits. For offenses committed on or after October 1, 2024, a rape conviction bars eligibility regardless of the victim’s age. Repeat offenders convicted of fourth-degree sex offenses involving child victims are also excluded.1Maryland General Assembly. Maryland Correctional Services Code 3-702 – Diminution of Confinement
The Four Ongoing Credit Types
Maryland uses four running credit categories that operate independently. You can earn from more than one at the same time, subject to the monthly cap described further down.
Good Conduct Credits
Good conduct credits are the baseline, and they are unusual because they are awarded in advance rather than earned month by month. The rate is 10 days per calendar month for most people, and 5 days per month if your sentence includes a violent crime or a conviction for manufacturing or distributing controlled dangerous substances.3Department of Legislative Services. Maryland Diminution Credit System They apply from the first day of confinement through the last day of the sentence.
Good conduct credit stops accruing during any period you are outside the Commissioner’s custody because of escape, when the sentence is stayed, or when the Maryland Parole Commission declines to grant credit after revoking parole or mandatory supervision.
Work Credits
Satisfactory performance on assigned work tasks earns an additional 5 days per calendar month, beginning the first day work is performed and prorated for partial months.4Maryland General Assembly. Maryland Correctional Services Code 3-705 – Diminution of Confinement for Satisfactory Performance of Work Tasks Institutional staff track performance under the Commissioner’s regulations.
Education and Program Credits
Education credits also pay up to 5 days per month, and the category is wider than the name suggests. Vocational courses, academic classes, workforce development, cognitive-behavioral therapy, substance abuse treatment, life skills programs, and anger management or conflict resolution therapy all count.5Maryland General Assembly. Maryland Correctional Services Code 3-706 – Diminution of Confinement for Education, Training, or Other Programs Partial months are prorated.
Special Project Credits
Special project credits carry the largest per-month payoff. For most people, participation in work projects or programs designated by the Commissioner and approved by the Secretary can earn up to 20 days per month. For sentences that include a violent crime, a registerable sexual offense, or a drug manufacturing or distribution conviction, the ceiling is 10 days per month.6Maryland General Assembly. Maryland Correctional Services Code 3-707 – Diminution of Confinement for Special Projects or Programs Qualifying projects include recidivism reduction programming and specialized housing assignments chosen by facility leadership.
Bonus Credits for Finishing School
A 2021 law added one-time credit bonuses for finishing specific educational milestones. Each qualifying accomplishment earns 60 days for most people, or 40 days for a sentence that includes a violent crime. The qualifying milestones are:
- Earning a high school diploma
- Passing the GED exam
- Completing a vocational program of at least 600 hours approved by the Secretary of Labor and the Commissioner
- Earning an associate’s or bachelor’s degree
You can claim only one vocational certificate bonus, one associate’s degree bonus, and one bachelor’s degree bonus. People convicted of first-degree murder or a sexual offense requiring registration are not eligible for the bonuses at all.7Maryland General Assembly. 2021 Regular Session – House Bill 89 Chapter 365
These bonuses sit outside the monthly cap, so a diploma or degree gives a meaningful one-time reduction on top of the regular categories.8Maryland General Assembly. Maryland Correctional Services Code 3-708 – Limitation on Total Number of Deductions
How Much Can Stack in One Month
Adding up the four ongoing categories at their maximums produces 40 days a month, but the law does not let anyone actually collect that much. If your sentence includes a violent crime, a registerable sexual offense, or a drug manufacturing or distribution conviction, total monthly credits across all categories cannot exceed 20 days. For everyone else, the cap is 30 days per calendar month.8Maryland General Assembly. Maryland Correctional Services Code 3-708 – Limitation on Total Number of Deductions
So a person with a non-violent offense who earns 10 days of good conduct, 5 for work, 5 for education, and 20 for a special project has 40 on paper but 30 credited. Someone with a violent conviction earning 5, 5, 5, and 10 reaches 25 on paper but only 20 counts. The records office runs this calculation each month.
Rates Depend on When You Were Sentenced
Maryland has rewritten the credit rules more than once, and the version that applies is tied to the date the sentence was imposed, not the date of the offense. Long or stacked sentences can straddle eras.
- Before October 1, 1992: good conduct was 5 days per month for everyone regardless of offense type, and special project credits maxed at 10 days per month.
- October 1, 1992 through September 30, 2017: good conduct split into the current two tiers (5 days for violent crimes and drug distribution offenses, 10 days for others), while special project credits stayed at up to 10 days per month.
- October 1, 2017 and later: good conduct kept the 1992 tiers, but special project credits rose to up to 20 days per month for most people (10 for violent, sexual, or drug offenders), and the overall monthly cap moved to the current 20/30-day structure.
The 2021 educational completion bonuses apply to eligible individuals regardless of sentencing date.3Department of Legislative Services. Maryland Diminution Credit System
Losing Credits and Winning Them Back
Credits are a privilege, not a vested right. The Division of Correction can revoke some or all of your good conduct and special project credits if you violate facility rules, weighing the nature and frequency of the violation.9Maryland General Assembly. Maryland Correctional Services Code 3-709 – Revocation of Diminution Credits for Violations of Rules of Discipline Physical altercations and contraband possession are common triggers. Revocation is discretionary; the statute says the Division “may” revoke.
An escape does not automatically wipe out previously earned credits, but it stops good conduct credit from accruing while you are gone, and that gap cannot be filled retroactively.
Before credits are taken, you are entitled to basic procedural protections: written notice of the alleged violation at least 24 hours before the hearing, a chance to present evidence and call witnesses when doing so would not compromise institutional security, and a written explanation of the evidence the decision-makers relied on. You do not have a right to a lawyer at these hearings, though a staff representative should be available when you cannot adequately present your own defense.
The Commissioner can restore revoked credits later. Restoration is handled under internal regulations and typically requires a sustained period of compliance after the infraction.9Maryland General Assembly. Maryland Correctional Services Code 3-709 – Revocation of Diminution Credits for Violations of Rules of Discipline
What Happens When the Credits Run Out the Sentence
Once accumulated credits plus time served equal the sentence, the Division of Correction must release you on mandatory supervision. This applies to anyone serving more than 18 months who was sentenced on or after July 2, 1970.10Maryland General Assembly. Maryland Correctional Services Code 7-501 – Release on Mandatory Supervision There is one significant carve-out: if you were convicted of a violent crime committed on or after October 1, 2009, you must first become eligible for parole before you can be released on mandatory supervision.
Mandatory supervision is not the end of the sentence. You remain under the Division of Parole and Probation, with conditions attached, until the maximum expiration date (the day the original sentence would have ended without credits). Violating those conditions can send you back to finish the remaining time inside. The stretch between the mandatory supervision release date and the maximum expiration date is the tail end of the sentence, served outside the walls but still under supervision.
Life Sentences
People serving life sentences do earn diminution credits, contrary to a common assumption. The credits are calculated manually, and no release date is generated because a life sentence has no maximum expiration to subtract from.11Department of Legislative Services. Maryland Diminution Credit System
Where the credits matter is parole eligibility. A person serving a life sentence becomes eligible for parole consideration after 15 years, reduced by the diminution credits earned. If the life sentence came out of a first-degree murder case in which the death penalty was sought, the threshold is 25 years less credits.12Legal Information Institute. Maryland Code of Regulations 12.02.06.02 – Parole Procedure for Life Sentences For consecutive life sentences, the required years are added together before credits are subtracted. Earning credits does not guarantee parole; it only moves up the date the Parole Commission first considers the case.
If You Think the Math Is Wrong
Errors in credit calculations happen, and catching one early can be the difference between a timely release and months of unnecessary confinement. Start with an informal conversation with your assigned counselor or the records office. If that does not resolve it, file a formal written grievance through the facility’s administrative remedy process. The institution must respond within a set period, and unsatisfactory answers can be appealed up through the regional and central office levels.
Only after fully exhausting the internal grievance process can the dispute go to court through a habeas corpus petition. A court reviewing a credit calculation challenge looks at whether the prison followed the statute correctly, not whether the underlying sentence was fair. A lawyer is not required to file, but the process involves specific procedural rules that are easier to navigate with legal help.