The Postal Service’s Supplying Principles and Practices (SPs and Ps) are a set of business principles and accompanying business practices that provide guidance to Postal Service supply chain management (SCM) employees engaged in purchasing and supplying activities.  They are intended to assist the Postal Service in obtaining best value and conducting efficient SCM functions. 

Please see the introductory material to the SPs and Ps for more information.

Note: On May 1, 2006, the Interim Internal Purchasing Guidelines were replaced by the Postal Service's Supplying Principles and Practices (SPs and Ps).

SPs and Ps (PDF) - April 2023
SPs and Ps (HTM) - April 2023
SPs and Ps (PDF) - September 2022
SPs and Ps (HTM) - September 2022
SPs and Ps (PDF) - September 2021
SPs and Ps (HTM) - September 2021
SPs and Ps (PDF) - June 2020
SPs and Ps (HTM) - June 2020
SPs and Ps (PDF) - October 2019
SPs and Ps (HTM) - October 2019
SPs and Ps (PDF) - October, 2018
SPs and Ps (HTM) - October, 2018
SPs and Ps (PDF) - February, 2018
SPs and Ps (HTM) - February, 2018
SPs and Ps (PDF) - September, 2016
SPs and Ps (HTM) - September, 2016
SPs and Ps (PDF) - August, 2015
SPs and Ps (HTM) - August, 2015
SPs and Ps (PDF) - February, 2015
SPs and Ps (HTM) - February, 2015
SPs and Ps (PDF) - October, 2014
SPs and Ps (HTM) - October, 2014
SPs and Ps (PDF) - July, 2014
SPs and Ps (HTM) - July, 2014
SPs and Ps (PDF) - September, 2013
SPs and Ps (HTM) - September, 2013
SPs and Ps (PDF) - February, 2013
SPs and Ps (HTM) - February, 2013
SPs and Ps (PDF) - November, 2012
SPs and Ps (HTM) - November, 2012
SPs and Ps (PDF) - December, 2011
SPs and Ps (HTM) - December, 2011
SPs and Ps (PDF) - January, 2011
SPs and Ps (HTM) - January, 2011
SPs and Ps (PDF) - February 1, 2010
SPs and Ps (HTM) - February 1, 2010
SPs and Ps (PDF) - August 2009
SPs and Ps (HTM) - August 2009
SPs and Ps (PDF) - December 31, 2008
SPs and Ps (HTM) - December 31, 2008

Interim Internal Purchasing Guidelines (IIPG)
May 19, 2005, updated with Postal Bulletin revisions through January 19, 2006.
IIPG (PDF)
IIPG (HTM)

Issue 1
January 1997, updated with Postal Bulletin revisions through November 15, 2001.
PM Issue 1 (PDF)
PM Issue 1 (HTM)

Issue 2
January 2002, incorporates Postal Bulletin changes to Issue 1 plus contains numerous new and significant changes in purchasing policy.
PM Issue 2 (PDF)
PM Issue 2 (HTM)

Issue 3
December 25, 2003, updated with Postal Bulletin revision through October 1, 2004
PM Issue 3 (PDF)
PM Issue 3 (HTM)

If you wish to view Publication 41, USPS Procurement Manual, the policies and procedures of which were replaced by PM Issue 1 on 1/27/2000, follow the link for Publication 41 or Publication 41 text-only file.