A powertrain for a vehicle, may include a first planetary gear set having three rotation elements, with an input shaft connected to a first rotation element of the three rotation elements; an output shaft connected to a second rotation element of the first planetary gear set; a differential connected to the output shaft; a brake configured to lock or release a third rotation element of the first planetary gear set; a hub connected to the second rotation element through a clutch; and a sleeve unit restricted in rotation with respect to the hub and configured to be linearly slidable along an axial direction of the first planetary gear set to change a restriction state of relative rotation between a selected driveshaft of two driveshafts receiving power from the differential, the second rotation element, the third rotation element, and the hub by linear sliding.