State and Local Government Series (SLGS) 
Treasury Debt: A Description 
Steven Maguire 
Specialist in Public Finance 
May 13, 2011 
Congressional Research Service
7-5700 
www.crs.gov 
R41811 
CRS Report for Congress
P
  repared for Members and Committees of Congress        
State and Local Government Series (SLGS) Treasury Debt: A Description 
 
Introduction 
The U.S. Treasury projected the federal debt will reach its statutory limit on May 16, 2011. On 
May 2, 2011, in anticipation of reaching the statutory debt limit, U.S. Treasury Secretary Timothy 
Geithner sent a letter to Congress indicating that he would declare a debt issuance suspension 
period on May 16 to extend Treasury’s borrowing capacity until early August 2011. 
In the same letter, Secretary Geithner also indicated that Treasury would use its existing 
authorities to extend borrowing capacity. One example of this is that on May 6, 2011, the 
Treasury Department “suspend[ed] until further notice the issuance of State and Local 
Government Series (SLGS) Treasury securities.”1 
As of April 30, 2011, SLGS represented 1.27% ($180.8 billion) of total debt outstanding 
(approximately 0.5% of outstanding debt is not subject to the debt limit). Suspending SLGSs will 
not change the debt limit, rather just delay the date when it is reached. Some have expressed 
concern that this suspension will have a negative impact on state and local government finances 
In the near term, the suspension is not expected to cause significant disruptions for state and local 
government issuers. This report explains SLGS, a nonmarketable, custom tailored security, and 
how suspension may impact state and local government issuers.  
SLGS Purpose 
SLGSs are an administrative tool state and local governments use to comply with Internal 
Revenue Service rules on how the proceeds of tax-exempt bonds can be invested. Generally, state 
and local government issuers cannot invest tax-exempt bond proceeds “to acquire higher yielding 
instruments.”2 SLGSs are nonmarketable securities offered by the U.S. Treasury to state and local 
government bond issuers that, by design, comply with IRS rules. 
SLGSs are help state and local governments manage debt and capital spending. The timing of 
spending on capital projects and the required coordination with state and local budget 
appropriation cycles typically results in a mismatch between when bonds are issued and when 
spending needs arise. SLGSs provide a “safe harbor” investment option for state and local 
governments to “park” the proceeds until needed to pay vendors. 
Issuers also use SLGSs to reduce interest cost. Issuers often sell a second tranche of tax-exempt 
bonds to replace outstanding bonds to take advantage of falling interest rates or to establish a 
reserve fund (or escrow account) to help repay or service outstanding bonds.3 The IRS identifies 
two general types of refunding, “current” and “advanced.” If the old bonds are redeemed within 
                                                
1 U.S. Treasury, Letter to The Honorable John A. Boehner, released May 2, 2011, available at http://www.treasury.gov/
connect/blog/Documents/FINAL%20Debt%20Limit%20Letter%2005-02-2011%20Boehner.pdf. This was the third 
letter sent. See CRS Report RL31967, The Debt Limit: History and Recent Increases, by D. Andrew Austin and Mindy 
R. Levit. 
2 Generally, when proceeds of tax-exempt bonds are invested in higher-yielding instruments, they are considered 
“arbitrage bonds.” These arbitrage bonds are not permitted under IRS rules and are taxable, see 26 U.S.C. 148(a)(1). 
3 Generally, the size of the reserve fund cannot exceed 10% of the original bond issuance. 
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State and Local Government Series (SLGS) Treasury Debt: A Description 
 
six months the proceeds from the new bonds are in compliance with IRS regulations. This is 
considered a “current refunding.” 
In contrast, if the proceeds of the new issue are outstanding for more than six months, the new 
bonds would likely violate IRS rules and lose their tax-exempt status. This is considered 
“advanced refunding” and the proceeds from the bonds are most often used to purchase SLGSs. 
Advance refunding is necessary as many outstanding bonds cannot be bought from the holder or 
“called” back before a given number of years, typically 10 years. Thus, the SLGS maturity must 
roughly match the time to the term of the old bond to be refunded. For example, if a refunding 
bond were issued today for a bond that can be called one year from today, a SLGS with a term of 
one year would be purchased. Today, the interest rate paid by the U.S. Treasury on the security 
would be 0.18%.4 
SLGS Volume 
SLGS volume has declined as state and local governments have not been refunding existing debt 
and the need for SLGSs has waned. As noted earlier, as of April 30, 2011, $180.8 billion of 
SLGSs were outstanding—down from $291.3 billion four years earlier. Table 1 reports SLGSs 
outstanding in April for the last five fiscal years. The slow decline will likely continue as market 
participants seem to have a limited appetite for the SLGS instruments.5 The declining volume 
likely reflects strained state and local budgets generally and the relatively low interest rate paid 
by the U.S. Treasury. The lower rate reduces the opportunity cost of unspent bond proceeds. 
Through April of FY2011, SLGS redemptions ($64.7 billion) have exceeded SLGS issues 
($52.4 billion) by $12.3 billion. 
Table 1. Total SLGS Outstanding and Percentage of Total Debt Outstanding 
(On April 30 of year listed) 
Percent of Total U.S. 
April SLGS Outstanding 
Change from 
Treasury Debt 
Year 
(in millions) 
Previous April 
Outstandinga 
2007 $291,250 
 
3.3% 
2008 $286,818  -1.5%  3.1% 
2009 $238,195  -17.0%  2.1% 
2010 $209,445  -12.1%  1.6% 
2011 $180,849  -13.7%  1.3% 
Source: U.S. Treasury, Debt Position and Activity Report, various fiscal years, available at 
http://www.treasurydirect.gov/govt/reports/pd/pd_debtposactrpt.htm. 
a.  Roughly 0.5% of total debt outstanding is not subject to the debt limit.  
                                                
4 U.S. Treasury, “SLGS Daily Rate Table,” available at https://www.treasurydirect.gov/GA-SL/SLGS/
selectSLGSDate.htm, visited May 5, 2011. The SLGS was suspended May 6, 2011. 
5 Temple-West, Patrick, “Treasury Schedules SLGS Closure for Friday,” The Bond Buyer, May 2, 2011. 
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State and Local Government Series (SLGS) Treasury Debt: A Description 
 
SLGS Suspension 
The suspension of the SLGS program will likely create some disruptions for tax-exempt bond 
issuers that had anticipated using SLGSs for debt management in the near term. As noted in the 
U.S. Treasury letter, the suspension will “impose some added cost and inconvenience on state and 
local governments.”6 Without SLGSs, issuers will find other assets to invest and will be required 
to monitor the investments to insure they do not violate IRS rules. The IRS rules apply to the 
yield on the asset investment, not necessarily the type of asset. A likely alternative would be other 
U.S. Treasury securities purchased on the secondary market. As noted above, the impact of the 
suspension is mitigated by the apparent decline in demand for the instruments. An extended 
suspension, however, may generate significantly more disruptions as compliance costs would 
increase for potentially more issuers. 
A long term suspension coupled with rising interest rates, however, could lead to a more 
significant strain on state and local debt management. 
According to the U.S. Treasury, the SLGS program has been suspended six times in the previous 
20 years. The periods of suspension lasted an average of 63 days, and are detailed in Table 2. The 
most recent suspension was for one day. In past suspensions, little market response was noted 
though some used the opportunity to suggest changes to the SLGS program to improve its 
operation.7 
Table 2. Suspension of the SLGS Program Over Last 20 Years 
Begin End 
Days 
October 18, 1995 
March 29, 1996 
163 
May 15, 2002 
July 7, 2002 
53 
February 19, 2003 
May 26, 2003 
96 
October 14, 2004 
November 21, 2004 
38 
February 16, 2006 
March 16, 2006 
28 
September 27, 2007 
September 28, 2007 
1 
 Average 
63 
Source: U.S. Treasury, “State and Local Government Series: Frequently Asked Questions,” released May 2, 
2011, available at http://www.treasury.gov/connect/blog/Pages/secretary-geithner-sends-debt-limit-letter-to-
congress.aspx. 
Notes: CRS Calculations based on U.S. Treasury data. 
 
                                                
6 U.S. Treasury, “State and Local Government Series: Frequently Asked Questions,” released May 2, 2011, available at 
http://www.treasury.gov/connect/blog/Pages/secretary-geithner-sends-debt-limit-letter-to-congress.aspx. 
7 The Bond Buyer, “Market Participants Ask Treasury to Make Changes in Slugs,” January 19, 1996. 
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State and Local Government Series (SLGS) Treasury Debt: A Description 
 
Author Contact Information 
 
Steven Maguire 
   
Specialist in Public Finance 
smaguire@crs.loc.gov, 7-7841 
 
 
Congressional Research Service 
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