Payroll taxes are basically the taxes that are deducted from an employee's salary and paid to the government, they include social security taxes and medicare taxes, which are used to fund social security and medicare programs. The calculation is usually a percentage of the employee's salary, and it's typically split between the employer and the employee, so both parties are responsible for paying them. The employee's portion is usually deducted from their paycheck, while the employer's portion is paid separately, so it's kind of a shared responsibility, with the employer also handling the administrative side of things.