I created a new LLC on 10/7/20. I received $0 income for 2020 (I do have $2,500 in expenses to claim). Should I file for 2020, or can I wait until a year to file w/ 2021?

I heard that opening a LLC within 90 days of a tax year, and has zero revenue, could push their filing back a year.  Want to make sure this is correct?