"Sch SE-T: Max Deferral line 20 should be blank." "Max deferral line 20: 0." Still says I need to fix it. What am i missing?

I am not sure whether you want to claim the deferral or delete the entry.

In TurboTax Online Self-Employed, I was able to enter a self-employment tax deferral and pass Review.  Then I was able to remove self-employment tax deferral and pass Review.  Follow these steps. 

• Down the left side of the screen, click on Federal.
• Across the top of the screen, click on Deductions  & credits.
• Under Your tax breaks, scroll down to Self-employment tax deferral.
• Click on Edit/Add to the right of Self-employment tax deferral.
• At the screen Do you want more time to pay your self-employment tax?, click Yes.
• At the screen Let's start by getting your eligible income, I have left the dollar amount that was previously entered, others change this amount to $0.
• Click on Continue.
• At the screen Tell us how much you'd like to defer, delete the dollar amount.
• Click Continue.
• Click through Federal Review to make sure than the Review issue has been removed.
• At the screen Some of your self-employment taxes may be eligible, click Skip.

Hey James,

I'm having the same issue after trying selecting No to the tax deferral, the review prompts the form SE-T line 20 which automatically gets a 0. which corresponds to the 0.00 on the self-employment tax deferral under deductions and credits. I am unable to pass the review. Attached is an imagine to illustrate

Let me clarify your situation.  If, at the screen Do you want more time to pay your self-employment tax?, you click Yes.

Does the screen say It looks like you're not eligible for this deferral.

Or does it say Let's start by getting your eligible income?

this did Not work.

Have you tired leaving the field blank?