
The 90-Day Letter: How Small Businesses Can Fight an IRS Notice of Deficiency in Tax Court
A statutory notice of deficiency gives a small business owner exactly 90 days to petition the U.S. Tax Court — the only path to challenge an IRS adjustment without paying first. This guide explains CP3219A, the Section 6213 deadline, the $50,000 small tax case election, and the records that decide outcomes.










