Charged Higgs production with a top in MC@NLO

The production in association with a top quark is the most promising search channel for charged Higgs bosons at the LHC. We review its theoretical description including next-to-leading order corrections and the combination with a parton shower. The latter allows us to for the first time answer questions about the kinematics of all jets in the process. We then describe the consistent subtraction of intermediate states and present new results about the bottom mass uncertainty impacting the parton densisities.