Clients recently began receiving letters indicating Sales/Use tax was reported and unpaid despite certification that none is due and no calculation of tax in Box 20. Nothing on the front end indicates tax due-client letter, voucher or tax return, but that amount was apparently added to the back end when e-filing. There's an override box to omit the tax but how on earth would you expect that to be necessary when every other indicator shows it's not being calculated?! My expectation now is that I'm going to have to respond to several hundred or more letters relating to this issue. That's a colossal time sink if that proves out.