An impacted sinus infection is when the pressure from the sinus infection begins to affect other parts of the body, such as the teeth, the eyes and the brain. The symptoms of an impacted sinus infection are similar to that of a regular case of sinusitis but with a higher intensity of pain and discomfort.
An employer's federal payroll tax responsibilities include withholding from an employee's compensation and paying an employer's contribution for Social Security and Medicare taxes under the Federal Insurance Contributions Act (FICA).
They are all different taxes withheld. Some are income tax withholding: FIT = Fed Income Tax, SIT = State Income Tax. These items go on your income tax return as payments against your income tax liability. FICA would be Social Security and Medicare which are not deductions nor credits on your income tax return.