This provision of CARES didn't really get the publicity it should have. One thing to note, from the Kiplinger Tax Letter, is that the law is vague about what it means for couples filing jointly. The $300 limit may be "per return" so a married couple filing jointly (which most do) would be eligible to deduct only $300, not $600. I did a subsequent search on this and the issue hasn't really been resolved.
Agreed, but it is a nice gift for those of us who are using QCDs for our charitables. Doing QCDs lets us use the standard deduction which is substantially larger than the non-charitable deductions we can gather. So we make a profit on that. But there are always popcorn charitables/small checks that we can't/don't use QCDs for, so now we can deduct $300 or $600 of those.
I'm bumping this thread because the IRS has released draft instructions for the 2020 form 1040, and these instructions do limit the deduction to $300 for a married couple. The draft pub is here: https://www.irs.gov/pub/irs-dft/i1040gi--dft.pdf
Line 10b
If you don't itemize deductions on Schedule A (Form 1040), you (or you and your spouse if filing jointly) can take a charitable deduction of up to $300 for cash contributions made in 2020 to organizations that are religious, charitable, educational, scientific, or literary in purpose. See Pub. 526 for more information on the types of organizations that qualify. A deduction can't be taken for a contribution to an organization described in IRC 509(a)(3) or for the establishment of a new, or maintenance of an existing, donor advised fund. Also, contributions of noncash property and contributions carried forward from prior years don't qualify for this deduction. See the Instructions for Schedule A and Pub. 526 for more information on those types of contributions. Enter the total amount of your contributions on line 10b. Don't enter more than $300.