A device 10 and method for forming a non-tapered end 12 of a gypsum board 14 into a tapered configuration or portion 16 includes a rotary drive tool 18 that imparts rotary motion to a tool bit 20 removably secured thereto, a pair of oppositely disposed angle members 22 having cooperating base portions 24 configured to promote attaching a dust collection collar 17 to the base portions 24, the angle members 22 disposing and guiding the rotating tool bit 20 between outer paper walls 28 of a non-tapered end 12 of the gypsum board 14 to ultimately severe portions of gypsum from the non-tapered end 12 thereby forming a recess 32 without damaging the outer paper walls 28 of the gypsum board 14. The device 10 and method ultimately removes severed portions of gypsum from the recess 32, whereupon, the non-tapered end 12 of the gypsum board 14 is forcibly bent to form a tapered configuration, end edges 128 of the board 14 are secured together with tape 122 to prevent the board 14 from returning to a non-tapered configuration, and the gypsum board 14 is secured to a support structure 38 such that tapered portions 16 of adjacent gypsum boards 14 cooperate to promote a planar finished seam when tape and joint compound are applied thereto.