We've used TurboTax (CD Windows) for years to prepare and file electronically both our federal and Maryland state tax returns. This year, at the end of our Maryland tax-return preparation, the TurboTax software informed us we would have to submit the return by mail, rather than electronically. We suspect the reason is that 2020 is the first tax year in which we've had to report Maryland Schedule K-1 information. Does TurboTax not support this state form?
