Perk Rate/Fallout

Perk Rate is a derived statistic

Gameplay
It affects how often the character is allowed to pick a perk. A character's perk rate depends on their race and on certain traits such as Skilled (which increases the rate) or Fear the Reaper (which decreases it). Some perks, like Divine Favor, may decrease the perk rate as well.

The perk rate is 3, which means that it is possible to pick a new perk every 3 levels. You are not able to save up perks to use at future perk acquiring levels. Any unselected perk will be lost at the next perk level if you do not select one before this time.