What percentage of gross wages is taken for ss medicare and federal taxes?

Income tax withholding is entirely dependent on the employees personal situation. 2 people, making the exact same wage can, and normally do, have totally different amounts withheld....and in many ways it makes no difference how much is withheld, as it is applied a an estimated payment toward whatever income tax is ultimately due with that years individual tax return...which has things like deductions, number of children or dependents, medical expenses, charity, mortgage payments, other taxes paid, etc., etc., as considerations.

FICA is a total of 15.3% of wages...but NOT gross, only crtain wages are considered FICA taxable...and there are maximum limits to parts of it too. The employer MUST pay half the FICA so the employee only sees 7.65% of the applicable wages as a deduction.