IRS Form 8959 – Fillable PDF for Additional Medicare Tax

Form 8959, Additional Medicare Tax, is required when your earned income, compensation, or self‑employment income exceeds the thresholds set by the IRS. Whether you are filing as an individual or on behalf of a small business, our Fill out this form button launches the Formize PDF Filler – a secure, browser‑based editor that lets you complete the form without downloading any software.

What Is Form 8959?

Form 8959 calculates the extra 0.9% Medicare tax that applies to high‑income earners. The tax is applied to wages, compensation, and self‑employment income above $200,000 (single) or $250,000 (married filing jointly). The form is attached to your annual Form 1040 filing.

How to Complete Form 8959 Online

1. Click the Fill out this form button on this page.
2. Wait a few seconds while the Formize PDF Filler app loads the fillable version of Form 8959.
3. Enter your personal information, wages, and any adjustments directly into the fields.
4. Review the calculated tax amount that appears automatically.
5. When you’re satisfied, click Save & Download to get a completed PDF you can attach to your tax return.

Common Mistakes to Avoid

• Using the wrong filing threshold: Remember the $200K/$250K limits differ by filing status.
• Leaving fields blank: The filler will highlight required fields in red.
• Double‑counting Medicare tax: If your employer already withheld the additional tax, report it on line 5, not line 4.
• Submitting an outdated version: Always use the 2024 PDF linked below to ensure you have the latest layout.

Where to Submit the Form

Attach the completed Form 8959 to your Form 1040 when filing electronically or include it with your paper return. If you use a tax professional, provide them the saved PDF.

Need extra help? The IRS Instructions for Form 1040 contain a detailed section on Form 8959.