Who contributes money to the social security trust fund?

I am not really sure but I think payroll taxes so like 6.2% of peoples income is used to fund the program, I hope my answer was correct

The money that funds Social Security comes from payroll taxes. Every worker in the United States has 6.2 percent of their income deducted each pay period and their employers also contribute 6.2 percent. People who are self-employed also pay the Social Security tax. This money, along with interest earned on the deductions, is used to fund the program.