Title 5, U.S. Code, Section 3341 is the federal statute that lets the head of an executive department or military department temporarily assign — “detail” — an employee from one bureau or office to another inside that same department. The detail must be made by written order. It can run for up to 120 days at a time, and it can be renewed in successive 120-day periods by another written order. One narrow exception to the time limit applies to certain Department of Defense details tied to base closures and restructurings.1GovInfo. 5 USC 3341 – Details; Within Executive or Military Departments
What Section 3341 Actually Authorizes
The statute is short and has three subsections.
Subsection (a) gives the department head authority to detail employees among the bureaus and offices of the department. It contains one express carve-out: an employee “required by law to be exclusively engaged on some specific work” cannot be detailed away from that work.2Office of the Law Revision Counsel. 5 USC 3341
Subsection (b)(1) sets the two procedural rules that define how the authority is exercised. Every detail must be made by written order of the department head, and no single detail may exceed 120 days. Renewals are permitted, but each renewal must also be made by written order.1GovInfo. 5 USC 3341 – Details; Within Executive or Military Departments Nothing in the text caps the number of renewals, so a detail can continue as long as the department head reauthorizes it in writing every 120 days.
Subsection (b)(2) exempts certain Department of Defense details from the 120-day limit. The exemption applies to details made in connection with the closure or realignment of a military installation under a base closure law, or an organizational restructuring that reduces the size of the armed forces or the civilian workforce, and only if the position the employee is detailed to will itself be eliminated by the date of the closure, realignment, or restructuring.2Office of the Law Revision Counsel. 5 USC 3341 Subsection (c) defines “base closure law” by cross-reference to Section 101(a)(17) of Title 10.1GovInfo. 5 USC 3341 – Details; Within Executive or Military Departments
What Counts as a Detail
A detail is a temporary assignment. The employee’s underlying position — the “position of record” — does not change. The employee continues to occupy that position and be paid from it, and returns to it when the detail ends.3U.S. Department of State. 3 FAM 2410 – Details and Transfers of Employees That is what separates a detail from a reassignment, which permanently changes the position, and from a transfer, which moves the employee to a different agency.
During the detail, the employee keeps their grade, pay, health and life insurance, retirement contributions, and leave accrual. The permanent organization is expected to keep the detailee informed of training and promotion opportunities in the position of record and to document performance during the detail. A detail can be ended before its expiration date when circumstances warrant.4HHS. HHS Instruction 300-3 – Detail and IPA Assignments
The 120-Day Clock and Renewals
Each detail runs for a maximum of 120 days under subsection (b)(1). To continue the assignment past that point, the department head must issue a new written order renewing the detail for another 120 days.1GovInfo. 5 USC 3341 – Details; Within Executive or Military Departments The statute does not put a ceiling on how many times a detail can be renewed. In practice, the paperwork discipline — a fresh written order on each renewal — is the guardrail.
The DoD base-closure exception in subsection (b)(2) is the only place where the 120-day cap simply does not run.2Office of the Law Revision Counsel. 5 USC 3341
Details to Higher-Graded Positions
The 120-day figure in Section 3341 lines up with a separate rule under OPM’s promotion regulations, and this is where the statute most often creates practical problems for employees. Under 5 CFR § 335.103, if an employee is detailed to a higher-graded position — or one with greater promotion potential — for more than 120 days in total, the agency must use competitive procedures under its merit promotion plan. In calculating that 120-day total, the agency has to count any prior noncompetitive details to higher-graded positions and noncompetitive temporary promotions during the preceding 12 months.5eCFR. 5 CFR Part 335 – Promotion and Internal Placement
When an employee performs higher-graded duties for more than 120 days without competition, a retroactive temporary promotion and back pay can be available. That remedy is not automatic. It requires a final order from an “appropriate authority” such as a court, the Merit Systems Protection Board, an arbitrator, or the agency head finding a violation of law, agency policy, or a collective bargaining agreement. OPM built this remedial option into 5 CFR 335.103 through a 2024 amendment.6OPM. Time Limited Promotion Memo With FAQs
Competitive and Excepted Service Details
OPM’s implementing regulations sit at 5 CFR Part 300, Subpart C, issued under both Section 3341 and Executive Order 13562.7eCFR. 5 CFR Part 300 Subpart C – Detail of Employees They add a rule the statute itself does not address. Detailing an excepted-service employee into a competitive-service position generally requires prior OPM approval. The main carve-outs are for employees appointed under Schedule A, B, D, or a Veterans Recruitment Appointment. OPM reviews these requests case by case and expects the requesting agency to document why the particular excepted-service employee is needed.8OPM. Request to Detail Between an Excepted Service Position and a Competitive Service Position
Who Pays for the Detail
Section 3341 does not say whether the receiving office or agency has to reimburse the loaning office for the detailee’s salary. That silence was resolved for interagency details by a 1985 Government Accountability Office decision, B-211373, reported at 64 Comp. Gen. 370. The GAO held that non-reimbursable interagency details generally violate the “purpose statute” at 31 U.S.C. § 1301(a), because the loaning agency ends up spending its appropriations on the receiving agency’s work, and the receiving agency ends up with an unauthorized augmentation of its own appropriations.9GAO. B-211373, 64 Comp. Gen. 370
The decision left two narrow openings. A non-reimbursable detail is still permitted where the work is similar or related to what the loaning agency normally does and aids the loaning agency in accomplishing a purpose for which its own appropriations were provided. A non-reimbursable detail is also permitted where it is brief, the services cannot be obtained by other means, and the personnel numbers and costs are negligible.10GAO. B-211373, 64 Comp. Gen. 370
Interagency details outside those exceptions are typically run under the Economy Act at 31 U.S.C. §§ 1535-1536, which authorizes written agreements under which the receiving agency reimburses the loaning agency for the cost of the employee’s services.11GAO. B-211373 Agencies formalize reimbursable details through interagency agreements, often processed in Treasury’s G-Invoicing system, with a detail addendum that spells out salary, benefits, travel, supervisory responsibilities, and duration.12GSA. Detail of Employees – HRM 9334.2C
State Department personnel detailed to other executive agencies fall under a different reimbursement statute, 22 U.S.C. § 2685, with its own set of exceptions covering short details, reciprocal exchanges of roughly equal numbers of personnel, and up to 15 employees on longer non-reimbursable details.13GAO. B-211373.2
What Section 3341 Does Not Cover
The statute is limited to details within a single executive or military department. It is not the authority for several adjacent situations that readers often assume it governs.
Senior Executive Service details have their own rules at 5 CFR § 317.903. SES details still run in 120-day increments, but an SES employee cannot be detailed to unclassified duties for more than 240 days. When a non-SES employee is detailed into an SES position for more than 240 days, competitive procedures are required unless the employee is eligible for a noncompetitive SES career appointment. Certain extended SES details, including placement of an SES detailee in a position at or below the GS-15 level, require OPM approval.14eCFR. 5 CFR 317.903 – Details
Details to international organizations run under Section 3343, not 3341. Those details can last up to five years, extendable by three more at the President’s discretion, with the loaning agency continuing to pay salary and the employee retaining rights and seniority.15FindLaw. 5 USC 3343 – Details; to International Organizations Details of administrative law judges are covered separately by Section 3344.
Filling a vacant Senate-confirmed position on an acting basis is not a detail under Section 3341 at all. That is the exclusive territory of the Federal Vacancies Reform Act at Sections 3345 through 3349. Under Section 3345, the first assistant to the vacant position steps in automatically, though the President may instead designate another Senate-confirmed official or a senior agency employee who has served in the agency for at least 90 days during the preceding year at or above the GS-15 pay level.16Office of the Law Revision Counsel. 5 USC 3345 An earlier version of Section 3345 that had governed “details to office” was repealed in 1998 when Congress enacted the FVRA.17Cornell Law Institute. 5 USC 3345 – Acting Officer