Buy Services | GSA Countdown to America's 250th Anniversary: close Official websites use .gov .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS lock or means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Buy Services There are several ways agencies can buy professional services through GSA. One Acquisition Solution for Integrated Services + Multiple Award Schedule - Professional Services Category One Acquisition Solution for Integrated Services Professional services encompasses services that are advisory, problem-solving, and intellectual in nature and require advanced subject matter knowledge including: Management and advisory services Technical and engineering services Research and development Financial services Business administration services Social services Marketing and public relations services Legal services One Acquisition Solution for Integrated Services + OASIS+ is a new governmentwide, multiple-award indefinite-delivery indefinite-quantity (MA-IDIQ) multi-agency contract (MAC) program designed to address government agencies’ mission needs for a full range of service requirements that integrate multiple service disciplines, ancillary services and products. Visit OASIS+ for the latest information and recent announcements. Check out this high level overview OASIS+ fact sheet [PDF - 1 MB] to learn about contract scope, features and benefits, ordering process, and related eTools. Multiple Award Schedule Program - Professional Services Category Access to thousands of highly qualified vendors providing a full range of professional services using the MAS Program - Professional Services Category Discover the benefits by reviewing the fact sheet: Buying Services through GSA’s Multiple Award Schedule [PDF - 218 KB] One Acquisition Solution for Integrated Services OASIS contracts provide flexible and innovative solutions for complex professional services across multiple disciplines and mission spaces. Visit OASIS for additional information on Buyers Guidance and Industry Guidance resources. National Customer Service Center 800-488-311 We are available Sunday 9 p.m.-Friday 9:30 p.m. Eastern time. Average wait times are under a minute. Live chat currently closed: Normal hours are Sunday 9 p.m.-Friday 9:30 p.m. Eastern time. Email Us ProfessionalServices@gsa.gov Join the Conversation Professional Services Interact Community E-Tools GSA Advantage GSA eLibrary eBuy eOffer/eMod Multiple Award Schedule Solicitation Print Page Email Page Top Choose a location Error, The Per Diem API is not responding. Please try again later. No results could be found for the location you've entered. Get my location OR State City (optional) OR ZIP 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. Choose a date Select fiscal year OR Travel start date (mm/dd/yyyy) Travel end date (mm/dd/yyyy) Rates are available between 10/1/2023 and 09/30/2026. The End Date of your trip can not occur before the Start Date. Additional terms and conditions 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.