I get 2 smart check error message saying my 1040/1040SR lien 10Acharitable contributions are too large? And a 2nd on the same from my $300 entry (federal allowed amount) should be blank?? Software error??form saying the

[JamesG1]

I was able to enter the $300 charitable contribution and pass Review in TurboTax Desktop by following these steps: 

• Across the top of the screen, click on Federal Taxes.
• Click on Deductions & Credits.
• At the screen How do you want to enter your deductions and credits?, click on I’ll choose what I work on.
• Across the top of the screen Your 2020 Deductions & Credits, scroll down to the bottom and click Done with deductions.
• Continue until the screen Charitable Cash Contributions under CARES Act.
• Enter your charitable cash contribution.  If you enter more than $300 (Single taxpayer), your deduction will be capped at $300..
• Click Continue.
• Click Done with Other.
• Across the top of the screen, click Review, then Continue.
• After Review is complete, click Step-by-Step in the upper right hand corner of the screen.
• Select Form 1040 in the left hand column to review the entry on line 10b of the 1040.

This TurboTax Help states: 

• For 2020, even if you don’t itemize, you may take a charitable deduction of up to $300 for cash contributions made in 2020 to qualified organizations.