@RobertB4444 wrote:
Here's the IRS Tax Topic on this.
Example 5 in there matches my exact situation and indicates that I do: "
Example 5. Erin and Frank are married and file jointly. Erin has $150,000 in wages and Frank has $175,000 in wages. Neither Erin nor Frank has wages that exceed $200,000. Therefore, their employers didn't withhold Additional Medicare Tax. However, their combined $325,000 in wages exceeds the $250,000 threshold for joint filers. Erin and Frank are liable for Additional Medicare Tax on $75,000 of wages ($325,000 in wages minus the $250,000 threshold). Erin and Frank must file Form 8959."
