One can get up to a total of 25 non-challenge perks with all four DLCs installed. Other types of perks are granted through completing various tasks and do not count against the limit of regular perks. Only regular perks may be selected during level up. Additionally, six of the regular perks can be chosen more than once, such as Intense Training. There are 88 regular perks, 8 companion perks, 16 challenge perks, and 18 special perks. To counter how easy it was to max out the player character's skills in Fallout 3, most of the skill-boosting perks have been removed or replaced. Unlike in Fallout 3, the Perk Rate in Fallout: New Vegas is one perk every two levels.
