A worked example
A single filer earning $75,000/year has taxable income of $58,900 after the $16,100 standard deduction. Federal tax comes to about $7,747. Social Security takes 6.2% of the full $75,000 ($4,650), and Medicare takes 1.45% ($1,087.50) — for total FICA of $5,737.50. Net annual take-home lands around $61,515, or about $2,366 per biweekly paycheck.