PPP LOAN STATUS
Under CARES, if a business had applied for and received a PPP loan, it could not also receive ERTC. However, the CAA and ARPA changed that to allow businesses to take advantage of both programs. You cannot claim ERTC for employee wages that were paid using PPP loan funds.
Under CARES (for tax year 2020), eligible businesses were limited to those with 100 or fewer employees.
You need only count the number of full-time workers you employed in 2019, not during 2020 or 2021.
The CAA expanded eligibility to businesses with 500 or fewer employees, so larger employers became eligible for the credit in tax year 2021. See the Calculating the ERTC section for more detail