Each year, upon filing the FCC Form 499-A (Annual Telecommunications Reporting Worksheet), USAC uses the annual data to true-up prior billings that were based on projections of collected end-user revenue.
USAC compares actual reported revenue to quarterly projected revenue to determine if a company qualifies as de minimis for the year. Charges for de minimis companies are then reversed. For companies that do not qualify as de minimis, USAC would issue additional billings or credits, as needed, to compensate for under- or over-projections in each quarter.
The links below show the relevant information for each year's true up.
2013 True Up (2012 annual revenue)
2012 True Up (2011 annual revenue)
2011 True Up (2010 annual revenue)
2010 True Up (2009 annual revenue)
2009 True Up (2008 annual revenue)
2008 True Up (2007 annual revenue)
2007 True Up (2006 annual revenue)
2006 True Up (2005 annual revenue)
2005 True Up (2004 annual revenue)
2004 True Up (2003 annual revenue)
2003 True Up (2002 annual revenue)