In Mayo Foundation for Medical Education and Research v. United States , the U.S. Supreme Court upheld the validity of a Treasury Regulation that states that the student exception from FICA (Social Security and Medicare) tax does not apply to medical residents because they work at least 40 hours per week. Applying the deferential two-part standard of review from Chevron  the Supreme Court concluded that the relevant statutory provision was ambiguous and the regulation was a permissible interpretation of the statute.

For background on the medical resident FICA issue, click here.

As we have previously reported, since the 1990’s many academic medical centers and individual medical residents have filed claims with the IRS seeking refunds of FICA taxes paid on medical resident salaries based on the argument that the residents are students and thus exempt from FICA. In March 2010, the IRS announced that it would concede and pay outstanding claims for periods before April 1, 2005. April 1, 2005 is the date the new FICA regulation precluding student status for full-time workers  went into effect.