Payroll Tax Withholding (Simplified)

Federal income tax (Pub 15-T percentage method), employee FICA, Additional Medicare. Single-filer brackets bundled.

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Formula and source

Annualize gross. Apply Pub 15-T percentage-method bracket: fed_annual = base + (annual_gross - prev) * rate. Divide by pay periods. FICA: SS = min(gross, wage_base - ytd) * 0.062. Medicare = gross * 0.0145. Additional Medicare = 0.9% above the threshold.

IRS Publication 15-T (current year), Worksheet 1A (Percentage Method, manual payroll). Single-filer brackets bundled.

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