A lot of people saying because you pick up a work vehicular or supplies in MA they got you but you are taxed based on where the work is performed. For example You can run a tent company out of mass and only put up tents in nh. You should not be paying mass taxes on the time spent setting up and taking down the tent in nh. Office time should be taxed at mass rate. For you sounds like maybe 1 out of 8 hours of your day could justifiably be taxed at a mass rate based on time to pick up and get info/ supplies in ma.