W-2 wage income is the most tax-inefficient way to build wealth. While business owners and investors can defer, deduct, and structure their gains, wage earners face immediate withholding under IRC §3402. FICA taxes under IRC §3101, “FICA” and IRC §3111 impose a 6.2% Social Security tax on both the employer and employee, capped at wages of $184,500 for 2026. Medicare tax adds 1.45% on all wages, plus an Additional Medicare Tax of 0.9% under IRC §3101(b)(2) for single filers earning over $200,000 ($250,000 for married couples filing jointly).
To adjust the federal income tax withheld from your paycheck, file a Form W-4 with your employer. Increasing withholdings avoids underpayment penalties under IRC §6654, while decreasing them increases monthly cash flow if you anticipate significant deductions or credits.