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We are the largest governmentwide, multi-agency contract program that provides professional services via six indefinite delivery, indefinite quantity, or IDIQ, contracts.
Learn more about OASIS+.
April 1, 2026, Important system security update: SMS authentication for the OASIS+ Submission Portal (Symphony Procurement Suite) will be discontinued April 30, 2026, per GSA security policy. All users must switch to an authenticator app (Google Authenticator recommended). Learn more and find instructions on this blog on the OASIS+ Interact Community.
View the current OASIS+ contractor list [XLSX - 33 MB] (updated weekly)
OASIS+ has six separate and distinct IDIQ contracts. The size and type of your business determines what contract you are eligible for.
View master contracts
Domains are functionally aligned groupings of related non-IT services. Each domain includes multiple, related North American Industry Classification System, or NAICS codes. Domains and NAICS codes help determine the scope of a contract.
Management & Advisory
Intelligence Services
Facilities
Research & Development
Technical & Engineering
Environmental
Logistics
Enterprise Solutions
Business Administration
Financial Services
Human Capital
Marketing and Public Relations
Social Services
Learn more about domains and labor categories
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Error, The Per Diem API is not responding. Please try again later.
No results could be found for the location you've entered.
Rates for Alaska, Hawaii, and U.S. territories and possessions are set by the Department of Defense.
Rates for foreign countries are set by the Department of State.
Rates are available between 10/1/2023 and 09/30/2026.
The End Date of your trip can not occur before the Start Date.
Traveler reimbursement is based on the location of the work activities and not the accommodations, unless lodging is not available at the work activity, then the agency may authorize the rate where lodging is obtained.
Unless otherwise specified, the per diem locality is defined as "all locations within, or entirely surrounded by, the corporate limits of the key city, including independent entities located within those boundaries."
Per diem localities with county definitions shall include"all locations within, or entirely surrounded by, the corporate limits of the key city as well as the boundaries of the listed counties, including independent entities located within the boundaries of the key city and the listed counties (unless otherwise listed separately)."
When a military installation or Government - related facility(whether or not specifically named) is located partially within more than one city or county boundary, the applicable per diem rate for the entire installation or facility is the higher of the rates which apply to the cities and / or counties, even though part(s) of such activities may be located outside the defined per diem locality.
U.S. General Services Administration