For 2014, the IRC Technical Committee has made a number of changes to the calculation of IRC TCCs.
Most of these have small effects, or affect only a small minority of boats. In a number of cases, they either simplify the IRC software or make it more logical, without intent to change TCCs. Any effects in these cases are therefore also small and are not discussed in the published document (link below).
IRC 2014 TCC changes (updated 22/1/14)