Thanks for posting in the Community. I can provide clarification on Social Security percentages.
In order for me to provide you with the best information, could you please let me know why the Social Security percentages need to be changed? The reason for asking is that Social Security is generally taxed at a rate of 6.2% for the employer and the employee. I'm including an article with further insight into this, such as rates, wage bases and compliance information: Taxes and Rates: Wage Bases and Limits.
Also, I recommend the following articles for additional information about payroll: