Can I use temporary stat bonuses to obtain locked levelling perks in Fallout 4?
Solution 1:
You don't get any added "soft boost" from items as part of the stat requirements in the perks chart.
So if you popped a mentat or put on a special hat, these things will not effect your available perks in the perk chart.
You don't have to allocate a point immediately though either, you can store points but will be continually reminded by the game "You leveled up! Spend your points in the Perk Chart!"