You can retire from the military once you complete 20 years of qualifying service. On active duty, that means 20 years of active service and a pension check that starts the month you leave. In the National Guard or Reserve, it means 20 qualifying years, but the pay usually waits until age 60. A service-connected disability, a force-reduction program, or a mandatory age limit can move that date earlier or later than the standard rule suggests.
The 20-Year Rule on Active Duty
Complete 20 or more years of active service and you are eligible for retired pay that begins immediately.1Military Compensation and Financial Readiness. Active Duty Retirement Each branch has its own statute. Army officers retire under 10 U.S.C. § 3911. Navy and Marine Corps officers use 10 U.S.C. § 8323, which requires more than 20 years of active service with at least 10 as a commissioned officer.2Office of the Law Revision Counsel. 10 USC 8323 – Officers: 20 Years Air Force and Space Force officers have equivalent provisions under Subtitle D of Title 10.
The 20-year clock counts active service only. Time in a delayed entry program or inactive reserve status before active duty generally does not count toward this threshold, though certain prior service credits can affect the pay calculation. Every day matters. Falling a few days short usually means separation without retirement benefits rather than a smaller pension, so it is worth confirming your service computation date well before you plan to leave.
What Your Pension Will Look Like
Two systems currently produce retirement checks for active-duty members, and which one applies to you depends on your Date of Initial Entry into Military Service (DIEMS).
Legacy High-3
If your DIEMS is before January 1, 2006, and you did not opt into the newer system during the 2018 window, you are under Legacy High-3. Your monthly retired pay equals 2.5% of the average of your highest 36 months of basic pay, multiplied by your years of service. Twenty years produces 50% of that high-three average. Thirty years produces 75%.1Military Compensation and Financial Readiness. Active Duty Retirement
Blended Retirement System
Anyone who entered on or after January 1, 2018, is automatically in the Blended Retirement System.3Military Compensation and Financial Readiness. Blended Retirement Members with a DIEMS between January 1, 2006, and December 31, 2017, could opt in during a window that closed on December 31, 2018. BRS uses a 2.0% multiplier per year, so a 20-year retiree gets 40% of the high-three average rather than 50%.4The Official Army Benefits Website. Blended Retirement System
In exchange, BRS members receive automatic and matching government contributions to the Thrift Savings Plan (up to 5% of basic pay) and a mid-career continuation pay bonus. Starting in 2026, the continuation pay window shifts to 7 years of service instead of 8. Active component members receive 2.5 times their monthly basic pay; Guard and Reserve members receive 0.5 times. Both must commit to an additional four years of service to collect.5The Official Army Benefits Website. Changes Coming to Continuation Pay in 2026
BRS members who contribute steadily to TSP and capture the full match can build comparable total wealth, but the guaranteed monthly check is smaller. Knowing your DIEMS is the first step in any honest retirement projection.
National Guard and Reserve: 20 Qualifying Years, Usually at Age 60
Guard and Reserve members follow a path called non-regular retirement. The 20-year requirement is the same, but the years are measured differently. A qualifying year is any anniversary year in which you earn at least 50 retirement points.6Military Compensation and Financial Readiness. Reserve Retirement Points accumulate from drill weekends, annual training, correspondence courses, and any periods of active duty.
The timing is what sets Reserve retirement apart. Under 10 U.S.C. § 12731, Reserve and Guard retirees generally cannot begin drawing retired pay until age 60, even if they completed their 20 qualifying years years earlier.7Office of the Law Revision Counsel. 10 USC 12731 – Age and Service Requirements That creates a gap in which you have earned the benefit but cannot yet collect it.
Reduced Age for Mobilized Reservists
Reservists who serve on qualifying active duty after January 28, 2008, can pull the eligibility age down. For every 90 consecutive days of qualifying active service in a fiscal year, the age drops by three months.7Office of the Law Revision Counsel. 10 USC 12731 – Age and Service Requirements A reservist with 360 qualifying days would be eligible at 59 instead of 60. The age cannot drop below 50.
Qualifying duty includes mobilizations under Title 10 authorities such as §§ 12301(a), 12301(d), 12302, and 12304, among others. National emergency responses like hurricane relief count when the orders carry the right authority code.8The United States Army. Guard, Reserve Soldiers Can Opt for Reduced-Age Retirement Your DD-214 or mobilization orders will show the statute cited.
Retiring Earlier for Medical Reasons
A service-connected disability can qualify you for retirement regardless of how long you have served. Under 10 U.S.C. § 1201, a member may be retired when a physical evaluation board finds them unfit to perform their duties due to a disability that is permanent and stable.9Office of the Law Revision Counsel. 10 USC 1201 – Regulars and Members on Active Duty for More Than 30 Days: Retirement Two paths qualify: at least 20 years of service, or a disability rated at 30% or higher under the VA rating schedule.
That 30% threshold is the dividing line. Below 30%, a member found unfit is typically separated with severance pay. At 30% or above, you receive full retirement privileges, including healthcare access and a monthly annuity based on the severity of the condition.
Temporary vs. Permanent Disability Retired List
Members whose conditions have not fully stabilized may go on the Temporary Disability Retired List rather than the Permanent Disability Retired List. TDRL pay and benefits match PDRL, but the status requires periodic re-evaluations. A member can remain on the TDRL for a maximum of five years, after which the service must transfer them to the PDRL, separate them, or return them to duty.10U.S. Government Accountability Office. Military Disability Retirement: Closer Monitoring Would Improve the Temporary Retirement Process Re-evaluations typically come at roughly 18-month intervals during that window.
Retiring Between 15 and 20 Years Under TERA
During force reductions, Congress has periodically authorized the Secretary of Defense to offer retirement to members with 15 to 20 years of active service. Known as Temporary Early Retirement Authority, this program pays a reduced pension calculated the same way as a normal retirement but based on fewer years.
TERA is a discretionary tool the services open and close based on personnel needs, not something you can request on demand. When active, it targets specific ranks and career fields being drawn down. The pension is smaller because fewer years feed the multiplier, and the reduction is permanent. Anyone offered TERA should compare the lifetime pension difference against the cost of staying to 20.
When the Military Requires You to Retire
Federal law also caps how long you can stay in uniform. Under 10 U.S.C. § 1251, regular commissioned officers below general or flag officer rank must retire or separate on the first day of the month after they turn 62.11Office of the Law Revision Counsel. 10 USC 1251 – Age 62: Regular Commissioned Officers in Grades Below General and Flag Officer Grades; Exceptions Deferrals can extend that to 68, and in exceptional cases the Secretary of the military department can extend it further.
For enlisted members, the constraint is High Year of Tenure. HYT policies cap the years of service you can accumulate at each rank before you must promote or separate. Limits vary by branch. In the Air Force, a technical sergeant faces a 22-year cap, a master sergeant 24 years, and a senior master sergeant 26.12Joint Base Charleston. Air Force Returns Enlisted High Year of Tenure to Standards A senior airman who does not promote to staff sergeant must separate at 10 years, before reaching retirement eligibility. HYT limits are adjusted based on retention needs, so check your branch’s current policy.
When to File Your Retirement Application
Eligibility is only half of it. Paperwork has its own windows. Active-duty Army members, under a pilot program running through September 30, 2026, may submit between 12 and 24 months before the desired retirement date.13Soldier for Life. U.S. Army Retirement Planning Guide Other branches set their own timelines, but most require at least six months’ lead time.
Reserve and Guard members should submit retired pay applications no earlier than nine months and no later than 90 days before the eligibility age, which is normally 60 or the reduced age if you earned one. Have your DIEMS (which determines your retirement system), your Pay Entry Base Date (which sets your pay computation), and, for reservists, your most recent Retirement Points Accounting statement confirming 20 qualifying years. If you receive a PCS alert and prefer to retire instead, most branches give you 30 days from the alert date to submit that request.