SSI DISABILITY LUMP SUM

I FILED FOR DISABILITY IN  2018 BUT BECAUSE OF COVID IT HAD A DELAY AND WAS APPROVED IN DECEMBER.  I RECIEVED MY PAYMENT FOR DEC 2018- JAN 2023 SO I DON 'T GET MY 1099 YET.  I DON'T WANT TO WAIT UNTIL NEXT YEAR TO FIGURE OUT HOW MUCH WILL BE TAXED BUT NEITHER SOCIAL SECURITY NOT IRS WILL HELP. DOES ANYONE HERE KNOW?