What is the molecular shape of Sulfur Pentafluoride Anion? $\ce{SF6}$ is an octahedral shape which makes perfect sense. $\ce{SF5^+}$ arranges 5 pairs of electrons in a trigonal bipyramidal structure. But what if you add a lone pair to this? Will the electron pairs arrange into an octahedral shape, but due to extra repulsion of lone pair, or will it have some distortion?

Will it be similar to $\ce{BrF5}$ structure?
Yes, $\ce{SF5^-}$ does infact have an octahedral shape. It's structure would be



Yes, it is similar to the structure of $\ce{BrF5}$