Get your taxes done using TurboTax

Instead of trying to make the entries in the review section, go back through the interview section in TurboTax Online.   You may need to add some temporary income to be able to remove this error so you can e-file. 

Sign in to your return and choose Pick up where I left off

Click on Federal from the left menu

Click on Deductions and Credits from the top menu

Scroll down and click on See More Tax Breaks if you don't have the full list

Look for and Review the entries under Tax Relief related to Covid-19. 

Click Revisit / Enter / Edit next to Self-Employment (SE) tax deferral.   To update the form, answer YES to the first question (even though you don't want to defer these taxes).   Enter your eligible earnings (what you earned from 03/27/2020 - 12/31/2020) and on the next screen, enter 0 if you do not want to defer the taxes.   TurboTax will calculate the amount you are eligible to defer but you do not have to defer the tax, you can enter 0 in that field, and then you should be able to e-file. 

You can't defer the tax if you are showing a refund due to you.   So, if you completed the form while you were not showing a refund amount, but after entering additional information, you now show a refund - you will get a message that says ''Looks like you are not eligible for this deferral''.  

To be able to remove the adjustment in the interview, you can add another line item of income of 100K - that should be enough to allow you to edit the form.   Go back to the Self-Employment tax deferral, change the amount you want to defer to 0 - and then go back and remove the temporary income you added to get your return to a 'no refund due' state.