Form 843 can’t be filed online, so a pandemic-penalty refund claim has to be mailed before July 10
Taxpayers who owe pandemic-era penalties tied to the Kwong decision face a hard deadline: paper Form 843 claims must be mailed on or before July 10, 2026, and the IRS does not accept the form electronically. With fewer than six weeks left, the requirement to print, sign, and physically mail a document creates a bottleneck…