The IRS revised Form 1099-MISC for the 2020 tax year to accommodate the creation of a new Form 1099-NEC. The redesigned 1099-MISC has different box numbers for reporting certain income. Businesses must send Form 1099-MISC to recipients by February 1, 2021, and file it with the IRS by March 1 (March 31 if filing electronically).
If businesses are using Forms 1099-MISC to report amounts in box 8, Substitute Payments in Lieu of Dividends or Interest, or box 10, Gross Proceeds Paid to An Attorney, there is an exception to the normal due date. Those forms are due to recipients by February 16, 2021.
source: irs.gov