Pedants will argue that you shouldn't refer to Code Section 183 - Activities not Engaged in For Profit as the "hobby loss rule", because the word hobby appears nowhere in the statute. The pedants scored a point in 2021, but I will still be sticking with the term. It looked like a slow year for hobby loss developments, but we finished with two major cases including a big taxpayer win. Let’s take a look.

Kwong v. United States: A Pandemic-Era Decision That Could Reshape Tax Deadlines, Penalties, and Refund Opportunities
The 2025 court decision, Kwong v. United States, is quietly gaining traction among tax professionals for exactly these reasons. Its implications could be far-reaching, potentially opening the door to refund claims, penalty abatements, and revived tax deadlines that many assumed were long closed. But there’s a catch: the opportunity to act may be time-sensitive, and the window to preserve claims could begin closing in just a few short weeks. Here’s what the court actually decided and why it matters now.


