I took a year off because I decided I wanted to do PT partway through my senior year. I had to take all the prereqs in that extra year, as well as working.
There are a handful of us who were all in the same community college chem class who all have our BA/BS already but were taking a year off...it won't hurt your chances of getting in.
But, think about if it makes sense for you to do - if you need to take a few more classes to make your app more competitive, or work full time to save money for a year, or travel across Europe, then by all means do it. But I have friends who took a year off before planning on going to grad school, but once they were done with school they lost the motivation to go back and be in school again. Also, if you've already spent all the money on applications, and have gotten accepted, then really think about if you want to put it off another year (I'm not sure what your situation is, but if you've been accepted at school A, and then decide to wait another year, then it may hurt your chances of being accepted there a second time. I'm not totally sure about that but I would think a school may be less likely to offer you admission 2 yrs in a row).
But I don't think PT schools look down on taking a year off by any means.