I just purchased the annual permit in Feb 2015. From what the person at the store told me, the BRA is still enforcing the permit fees until Sept 1 2015. I would ask the BRA before I had to pay a citation on top of the permit fee. If you go to bra website, go to reservoirs, then to possum kingdom, then on the right about 1/4 way down the page is a list of pages you can go to. highlight property management, go to user fees. That is the only online thing I can find.
The first trip I took after the permit purchase, I was loading up and the BRA drove into the parking lot and watched while I loaded my boat and pulled up to tie it down. After I stopped and they could see my sticker on the boat they just drove on.
Better safe than sorry, better ask someone local.