Verification note: the mechanism, statutory basis, and duration rules described below reflect the Intergovernmental Personnel Act (IPA) Mobility Program as published by the U.S. Office of Personnel Management (opm.gov, “Intergovernmental Personnel Act”), 5 U.S.C. §§ 3371–3375, and agency-level implementing policy pages (NSF’s rotator-program page, HHS, EPA, and university sponsored-programs offices at UNC, University of Pittsburgh, and University of Florida), checked 2026-07-22. Specific duration figures below (the two-year initial term and four-year regulatory ceiling) are as consistently described across these agency implementing policies referencing 5 CFR Part 334; individual agencies layer their own internal caps on top of the government-wide rule, so always confirm current terms against the sponsoring federal agency’s own IPA policy and the specific written agreement before relying on this page for a live assignment.
What an IPA assignment is
An Intergovernmental Personnel Act (IPA) assignment is a temporary personnel exchange, authorized under the Intergovernmental Personnel Act Mobility Program, between a federal agency and an eligible non-federal organization — most commonly a college or university, but also state and local governments, Indian tribal governments, and federally funded research and development centers (FFRDCs). The assignment moves a person, not a grant: the individual physically works for the other organization for a defined period while an underlying agreement between the two institutions governs pay, benefits, and cost allocation for the duration.
Two directions are both routine. A federal agency can assign one of its own employees out to a university (for example, to teach, conduct research, or support a state agency), or — the direction research administrators encounter far more often — a university can send a faculty member or senior researcher into a federal agency on an inbound IPA assignment, typically to serve as a rotating program officer, scientific reviewer, or policy advisor. The National Science Foundation’s rotator program is the best-known example in the research-funding world: NSF routinely staffs program officer positions with academic scientists on IPA assignment from their home institutions, on the logic that someone actively doing research in a field is best positioned to evaluate and manage funding in that field for a limited term before returning to campus.
Statutory and regulatory basis
The authority comes from the Intergovernmental Personnel Act of 1970, codified at 5 U.S.C. §§ 3371–3375, with implementing regulations at 5 CFR Part 334 (“Temporary Assignments Under the Intergovernmental Personnel Act”). OPM administers the government-wide policy; individual agencies do not need OPM’s case-by-case approval to make an assignment — an agency head or designee can authorize one directly once a written agreement is in place between the agency and the non-federal organization, per OPM’s own published guidance on the program.
The statute’s stated objectives are broader than staffing convenience: strengthening the management capabilities of federal, state, and local governments; assisting the transfer of new technologies and approaches between sectors; involving state, local, and tribal officials in developing and implementing federal policy; and providing federal and non-federal employees with developmental experience they would not otherwise get. That framing matters for how sponsored-programs offices should present an IPA assignment internally — it is a recognized federal personnel-mobility program with its own statute, not an ad hoc arrangement a program officer or dean improvised.
Who is eligible
On the non-federal side, eligible organizations under the Act include institutions of higher education, state governments, local governments, Indian tribal governments, and other organizations OPM has designated as eligible (this can include certain nonprofit and federally funded research and development centers). Not every nonprofit or contractor qualifies automatically — eligibility is organization-level, and a sponsored-programs office fielding its first IPA request should confirm the receiving or sending federal agency has already validated the university’s eligibility status before assuming the mechanism applies.
On the individual side, the assignee is typically a current employee of the sending organization in a role relevant to the receiving organization’s need — a tenured or tenure-track faculty member, a senior research scientist, or comparable staff, rather than a student or short-term hire.
How the agreement works
The IPA assignment is documented in a written agreement between the federal agency and the non-federal organization (not simply a letter to the individual). CASRAI’s central sponsored-programs office is typically the university-side signatory and administrator of record, since the agreement touches payroll, benefits continuation, effort commitments, and often intellectual-property and conflict-of-interest terms that a single department is not positioned to negotiate alone.
Key terms the agreement typically fixes: the assignment’s start and end dates, which organization pays salary and benefits during the assignment (or how the two share that cost), whether the university continues the employee’s benefits and retirement contributions during the assignment, and what happens to the employee’s university appointment, tenure clock, and any active grants when they return. Because the assignee usually remains formally employed by their home institution throughout an inbound (university-to-agency) assignment, the agreement is what actually authorizes the federal agency to have that person perform official federal duties without converting them into a direct federal hire.
Duration limits and extensions
Agency IPA policies implementing 5 CFR Part 334 consistently describe an initial assignment term of up to two years, with the receiving agency able to grant an extension — commonly up to two additional years — subject to an overall four-year ceiling on a single assignment. Some individual agencies layer further internal limits on top of the government-wide framework (for example, additional caps on how much total IPA service an employee may accrue across a federal career, or shorter default terms for specific program types); those are agency policy choices, not a separate statutory requirement, so the receiving agency’s own IPA directive is the authority to check for a specific assignment rather than assuming one agency’s practice applies to another.
Reimbursement and cost allocation
5 U.S.C. § 3371 et seq. and its implementing regulations give the two organizations flexibility in how they split the cost of an assignment — salary, benefits, and travel can be borne by the sending organization, the receiving organization, or shared, and this is negotiated in the written agreement rather than fixed by statute. One provision research administrators should flag for the assignee up front: if the individual fails to complete the agreed period of service (leaves the assignment early without the agency’s consent), the statute requires reimbursement to the federal agency for its share of assignment costs, exclusive of the employee’s own salary and benefits — though the federal agency head or a designee can waive that reimbursement obligation for good and sufficient reason. This is a real financial-exposure question a sponsored-programs office should walk through with the assignee before an agreement is signed, not an afterthought.
Because an IPA assignment moves a person’s time rather than transferring grant funds, it does not itself create a subaward, a cooperative agreement, or an indirect-cost recovery event the way a sponsored project under 2 CFR 200 (Uniform Guidance) would. Sponsored-programs offices should not confuse IPA cost-sharing terms with the mandatory/voluntary cost-share concepts that apply to federal grants and cooperative agreements — the frameworks are related in spirit (both involve one organization bearing costs that benefit another) but are governed by entirely different statutory authorities.
How an IPA assignment differs from a detail, secondment, or sabbatical
- Federal detail: a temporary reassignment of an employee within the same agency, or between two federal agencies, without a change of employer — no IPA statute involved, and no non-federal organization is party to it.
- Corporate secondment: a private-sector analogue with no OPM or federal statutory framework; terms are purely contractual between two private organizations.
- Academic sabbatical: university-internal leave, typically for research or writing, that does not involve a receiving federal agency, a written interagency agreement, or the statutory reimbursement provisions described above.
- IPA assignment: the only one of the four with its own federal statute (5 U.S.C. §§ 3371–3375), a formal written agreement between a federal agency and an eligible non-federal organization, and OPM-published implementing regulations governing duration, cost, and reimbursement.
What a sponsored-programs office needs to manage
For the university side of an inbound (faculty-to-agency) assignment, the practical checklist a sponsored-programs or research administration office typically works through includes: confirming the receiving agency’s specific IPA policy and template agreement (these vary by agency, unlike a standardized form such as the SF-424 (R&R) package used for federal grant applications); negotiating who pays salary, benefits, and any relocation or travel costs during the assignment; documenting how the assignment affects the faculty member’s committed effort on any active federal awards, since effort reporting obligations do not pause just because the person is physically at a federal agency; addressing conflict-of-interest and financial-disclosure requirements the assignee will be subject to as a temporary federal employee, which are typically stricter than the university’s own conflict-of-interest policy; and confirming what happens to tenure clocks, benefits continuity, and reappointment rights on return.
Frequently asked questions
Does OPM have to approve every individual IPA assignment?
No. Agencies do not need OPM’s case-by-case approval to make an assignment under the IPA authority; the agency head or a designee can authorize one once a written agreement with the eligible non-federal organization is in place, per OPM’s published program guidance.
Who pays the assignee’s salary during an IPA assignment?
It depends on the written agreement. The statute and implementing regulations give the two organizations flexibility to allocate salary, benefits, and travel costs between them; there is no single government-wide default, so this is a specific negotiated term of each assignment agreement, not a fixed rule.
Does the assignee remain an employee of their home university?
In the typical inbound direction (university employee assigned to a federal agency), the individual generally remains employed by the university throughout, with the written agreement authorizing the federal agency to have them perform official duties without a separate federal hiring action. The reverse direction (a federal employee assigned to a university) works analogously in the other direction.
How long can an IPA assignment last?
Agency policies implementing 5 CFR Part 334 typically describe an initial term of up to two years with the possibility of an extension, subject to an overall ceiling of four years for a single assignment; the specific receiving agency’s own IPA directive governs the exact terms for a given assignment.
What happens if the assignee leaves the assignment early?
5 U.S.C. § 3371 et seq. requires reimbursement to the federal agency for its share of the assignment’s costs (not including the employee’s own salary and benefits) if the person does not complete the agreed period of service, though the agency head or a designee can waive this for good and sufficient reason.
For related mechanisms in federal research administration, see CASRAI’s Uniform Guidance (2 CFR 200) guide for the cost-principles framework that governs federal grant spending (distinct from IPA cost allocation), the cooperative agreement entry for a different federal award instrument entirely, and the departmental vs. central sponsored-programs office guide for how a university typically structures the office that would negotiate an IPA agreement.
