While the link provided is 'correct' it doesn't provide all the possibilities. With TT filing a previous year's return means paper filing. The IRS started this year with more than 5million paper returns from the 2020 tax year unprocessed. Your paper filing for 2020 will be at the bottom of that pile. Some tax prep firms can file a past year electronically. So, are you due a refund from 2020? would you like to get it this year or can you wait a very very long time. If you think you will owe, it might be good to get it filed, since you are already subject to failure to file (on time), failure to pay (on time) and interest that will accumulate from the date you should have filed. The advantage to filing a 2020 with TT is that info carries over from year to year. But, in your situation, how much info is going to carry forward? Only your name address, social, DOB or if you use different platforms for 2020 than for 2021 fill you have to enter your 10 children's names, SS#'s and DOB's. Or for a return including rental info, reentering all the depreciable items.....
The best approach will be according to your own patience, sensibilities etc.
