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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.

Wide Area Workflow (WAWF) is not to be used for the submission of fee vouchers.

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 E-Invoicing and WAWF Quick Link on this page for additional information, training, registration work instructions, etc.

NASA Implements E-Invoicing Phase IA:

Effective March 31, 2014, NASA implemented e-Invoicing Phase IA and will expand the scope to include all cost type contracts as required by the Department of Defense Federal Acquisition Regulations System (DFARS) change of August 29, 2012. NASA Headquarters Procurement issued Procurement Information Circular (PIC) 14-02 to implement Wide Area Workflow (WAWF) on all cost type contracts to Center Procurement Policy Offices.

The class deviation will provide authority to deviate from the auditor receipt of voucher requirements at NASA FAR Supplement (NFS) 1842.803(b)(1)(D). This class deviation will implement the revised Defense Contract Audit Agency (DCAA) policy and procedures for the submission and pre-payment processing of contractor interim vouchers as delineated in DFARS 242.803 (b) (B) entitled "Disallowing costs after incurrence, auditor receipt of voucher," dated August 29, 2012.

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, Jerry Hlass Road
                               Stennis Space Center, MS 39529
   E-mail address:
   Fax Number:        1-866-209-5415
   AP Invoice Fax Trasmittal Cover Sheet


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