At the end of the process, it says I'm not eligible for electronic filing because multiple lines are showing a zero balance. Why, and how do I fix it?

Most common 'fix' is to enter one dollar ($1) as Interest Income. Returns which show zero income and zero tax withheld generally can't be e-filed.

But I DID have income (SSA benefits).  Shouldn't I report it, even though I won't owe any money?  I did last year, here on Turbo Tax.  It worked then.

If your only income is SS benefits, then you have zero taxable income, and thus are normally ineligible to e-file. '$1 Interest' technique I mentioned previously usually works to enable e-filing; however, you are not required to file by IRS without any taxable income.

What box would i put the $1 for the interest?

 

I am not sure where you are seeing these $0 lines.  Many lines have a trashcan icon to the right where you can delete lines of data entry.

 

You may also have to delete forms with the Delete a Form tool. 

• Down the left side of the screen, click on Tax Tools.
• Then click on Tools.
• Then in the center of the page, click on Delete a Form.
• Choose the form to be delete and click Delete to the right of the form(s). 

See also this TurboTax Help.

 

To enter interest income, follow these steps: 

• Click on Federal.
• Click on Wages & Income.
• Under Your Income, choose Interest and Dividends.
• Choose Interest on 1099-INT.

Also see this TurboTax Help.