. including the impact of the changes to the definition of regulatory capital and reflecting the transitional provisions effective in 2014 , our estimated cet1 ratio ( cet1 to rwas on a basel i adjusted basis ) as of december 2013 would have been essentially unchanged as compared to our tier 1 common ratio under basel i . regulatory leverage ratios . the revised capital framework increased the minimum tier 1 leverage ratio applicable to us from 3% ( 3 % ) to 4% ( 4 % ) effective january 1 , 2014