Additional Medicare Tax applies at a 0.9% rate to applicable wages, compensation, and self-employment income over filing-status thresholds. It is distinct from the Net Investment Income Tax.

An employer's withholding rule is based on wages it pays an employee, without knowing the full household return. Two employers or a working spouse can therefore produce a result that differs from the amount withheld during the year.

Give the preparer all W-2s, self-employment information, and current withholding totals. A projection can identify a potential balance before filing, especially after a job change or large bonus. The relevant reporting form is Form 8959.

Your next steps

• Combine all applicable household earnings.
• Compare payroll withholding with projected liability.
• Review Form 8959 and payment adjustments.

General education, not individualized tax or legal advice. Illustrations use stated assumptions and do not promise a refund or tax saving.