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Welcome to NSSC Accounts Payable where we process all accounts payable invoices, centrally billed accounts, and government purchase card transactions for the Agency.

NASA Implements E-Invoicing Solution:

NASA's implementation of Department of Defense's Wide Area Workflow (WAWF) e-Invoicing solution recently went live for nearly 50 NASA contracts identified with Defense Contract Audit Agency (DCAA) /Defense Contract Management Agency (DCMA) approved invoices.   WAWF is a secure web-based system for electronic invoicing, receipt and acceptance. WAWF allows government vendors to submit and track invoices and receipt/acceptance documents over the web and allows government personnel to process those invoices in a real-time, paperless environment (Press Release 13-005). 

All NASA vendors are to continue submitting their invoices to the NSSC using their current process until they receive their WAWF Transition Letter from their respective NASA Contracting Officer(s).  Please refer to the WAWF Quick Link on this page for additional information, training, registration work instructions, etc.

For payment status questions or problems, vendors and employees should contact:
  NSSC Customer Contact Center at 1-877-677-2123 (1-877-NSSC123)
  E-mail inquiries:
  Fax inquiries: 1-866-779-6772 (1-866-779-NSSC)

The daily cut-off time each day for processing payments and refunds is 12:00 noon CST. Click here for the monthly cut-off dates for payments to Treasury.

Invoices, modifications, awards, and other Accounts Payable correspondence can be sent via mail, e-mail or fax:
   Mailing address:  NSSC - FMD Accounts Payable
                               Bldg. 1111, C Road
                               Stennis Space Center, MS 39529
   E-mail address:
   Fax Number:        1-866-209-5415


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