For retained players the salary cap will be charged as follows.

For Capped Players

• Rs. 12.5 crore for the first capped Player so retained
• Rs. 9.5 crore for the second capped Player so retained
• Rs. 7.5 crore for the third capped Player so retained
• Rs. 5.5 crore for the fourth capped Player so retained
• Rs. 4 crore for the fifth capped Player so retained

For Uncapped Players

• Rs. 4 crore for each uncapped Player so retained

http://www.iplt20.com/news/2013/announcements/4248/pepsi-ipl-2014-player-regulations

For retained players the salary cap will be charged as follows.

For Capped Players

• Rs. 12.5 crores for the first capped Player so retained
• Rs. 9.5 crores for the second capped Player so retained
• Rs. 7.5 crores for the third capped Player so retained
• Rs. 5.5 crores for the fourth capped Player so retained
• Rs. 4 crores for the fifth capped Player so retained

For Uncapped Players

• Rs. 4 crores for each uncapped Player so retained

Source.