You can print and mail the 2020 tax return you prepared, but you won't be able to e-file it without any income on it. Since your social security is not taxable, it is still producing a $0 tax return which can't be e-filed. Do you have any interest to report possibly? Any kind of miscellaneous income you can think of to report? You don't need to have received a tax document to report miscellaneous income. Any prizes or gambling winnings?
Worst case scenario, you claim the $1400 as Recovery Rebate on the 2021 return. It will take months to process returns filed by mail and it may not get processed until it is time to file 2021 - I have 2019 tax returns filed by mail that have not be processed yet - and we are in the 4th month of 2021.
If you are going to mail it (assuming you can't think of any of income to report), be sure to use the FREE version. Don't get stuck paying for a federal or state return. You can print out Form 1040, and fill it in yourself if you are just filing it to get your daughter listed as a dependent and do not have any other income to report.
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