This is the Statutory Notice of Deficiency. You have exactly 90 days to petition the U.S. Tax Court — there is no extension, ever. After it lapses, the tax is assessed.
A CP3219A is the formal notice that the IRS intends to assess additional tax, usually after an unresolved CP2000. It is the legal prerequisite to assessment and the trigger for your right to petition the Tax Court.
The 90-day period (150 days if addressed outside the U.S.) is statutory and absolute. Filing a Tax Court petition preserves your right to dispute the tax without paying first. Missing it means the deficiency is assessed and your remedies narrow sharply.
If the 90 days lapse without a petition, the tax, penalties, and interest are assessed and collection begins. The petition deadline is jurisdictional — courts cannot waive it. This is the most time-sensitive notice the IRS sends.
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