What is the total percentage of income that will be withheld from any employee's paycheck for no social security and medicare taxes?

If an employee is exempt from Social Security and Medicare taxes, typically due to specific circumstances like being a non-resident alien or certain religious exemptions, the total percentage of income withheld would be 0% for these taxes. Generally, Social Security tax is 6.2% and Medicare tax is 1.45%, totaling 7.65% for most employees. Thus, without these taxes, there would be no withholding from the paycheck for Social Security and Medicare.