Sec. 4101 Conversion to Chained CPI
“(3) Cost-of-living adjustment
“(A) In general—For purposes of paragraph (2), the cost-of-living adjustment for any calendar year is—
“(i) for adjustments first beginning before 2014, the product of—
“(I) the CPI fraction for calendar years before 2014, multiplied by
“(II) the Chained CPI fraction for calendar years after 2013,
“(ii) for adjustments first beginning after 2013, the Chained CPI fraction for years after 2013.
“(B) CPI fraction for calendar years before 2014—The CPI fraction for calendar years before 2014 is the fraction—
“(i) the numerator of which is the CPI for the calendar year 2012; and
“(ii) the denominator of which is the CPI for the calendar year 1992.
“(C) Chained cpi fraction for calendar years after 2013—The Chained CPI fraction for calendar years after 2013 is the fraction—
“(i) the numerator of which is the Chained CPI for the preceding calendar year, and
“(ii) the denominator of which is the Chained CPI for the calendar year 2012.”
“(4) Cpi and chained cpi for any calendar year—For purposes of paragraph (3)—
“(A) Cpi—The CPI for any calendar year is the average of the Consumer Price Index as of the close of the 12-month period ending on August 31 of such calendar year.
“(B) Chained cpi—The Chained CPI for any calendar year is the average of the Chained Consumer Price Index as of the close of the 12-month period ending on August 31 of such calendar year.”
“(5) Consumer price index and chained consumer price index—For purposes of paragraph (4)—
“(A) Consumer price index—The term Consumer Price Index means the last Consumer Price Index for all urban consumers published by the Department of Labor. For purposes of the preceding sentence, the revision of the Consumer Price Index which is most consistent with the Consumer Price Index for calendar year 1986 shall be used.
“(B) Chained consumer price index—The term Chained Consumer Price Index means the most recent estimate of the Chained Consumer Price Index for all urban consumers published by the Department of Labor.”
“(D) the term CPI increase percentage, with respect to a base quarter or cost-of-living computation quarter in any calendar year, means the percentage (rounded to the nearest one-tenth of 1 percent) by which the Chained Consumer Price Index for All Urban Consumers (as published in its initial form by the Bureau of Labor Statistics of the Department of Labor) for such base quarter or cost-of-living computation quarter exceeds such index for the later of—
“(i) the most recent calendar quarter (prior to such base quarter or cost-of-living computation quarter) which was a base quarter under subparagraph (A)(ii); or
“(ii) the most recent cost-of-living computation quarter under subparagraph (B);”
“(G) the Chained Consumer Price Index for All Urban Consumers for a base quarter, a cost-of-living computation quarter, or any other calendar quarter shall be the arithmetical mean of such index (as published in its initial form by the Bureau of Labor Statistics of the Department of Labor as of the end of such quarter) for the 12-month period ending with such quarter.”
“(D) the term Consumer Price Index means the Chained Consumer Price Index for All Urban Consumers (C-CPI-U), as published in its initial form by the Bureau of Labor Statistics of the Department of Labor.”