38 U.S.C. § 3564

1. (a)With respect to any fiscal year, the Secretary shall provide a percentage increase in the rates payable under sections 3532, 3534(b), and 3542(a) of this title equal to the percentage by which—
   1. (1)the Consumer Price Index (all items, United States city average) for the 12-month period ending on the June 30 preceding the beginning of the fiscal year for which the increase is made, exceeds
   2. (2)such Consumer Price Index for the 12-month period preceding the 12-month period described in paragraph (1).
2. (b)Any increase under subsection (a) in a rate with respect to a fiscal year after fiscal year 2004 and before fiscal year 2014 shall be rounded down to the next lower whole dollar amount. Any such increase with respect to a fiscal year after fiscal year 2013 shall be rounded to the nearest whole dollar amount.