Most of the time, you don't need to re-do your tax return.
If you prepared a tax return before licensing software, you don't need to re-do tax return. You just need to install license key to software, and open the prepared return file to netfile/efile/print.
If you switch software from Netfile version to Efile version, or vice versa, you don't need to re-do tax return, Efile and Netfile software reads the same tax return file.
Tags: re-do, redo