The 90-Day Letter, officially known as a Notice of Deficiency (or sometimes referred to as Letter 3219, Letter 531, or Notice CP3219A/N), is a crucial formal legal notice sent by the U.S. Internal Revenue Service (IRS).
It informs a taxpayer that the IRS has determined there is a deficiency (additional tax, penalties, and interest) owed, typically following an audit or an automated review of the tax return.
Key Aspects and Required Action
The most critical element of the 90-Day Letter is the deadline it imposes for the taxpayer to dispute the IRS’s findings without first paying the assessed tax.
- Deadline: You have exactly 90 days from the date on the notice (or 150 days if the notice is addressed to a person outside the U.S.) to take action.
- Legal Significance: The notice is often called your “ticket to the Tax Court,” because it is a prerequisite for challenging the deficiency in the United States Tax Court. The IRS is legally prohibited from assessing or collecting the disputed tax during this 90-day period.
Your Options Upon Receiving the Letter
- Agree and Pay: You can sign the enclosed agreement form (e.g., Form 5564, Waiver of Restrictions on Assessment) and pay the proposed tax, penalties, and interest. This closes the case for that tax year.
- Challenge in Tax Court (Without Paying First): If you disagree with the determination, you must file a petition with the U.S. Tax Court before the 90-day deadline expires. This allows you to contest the deficiency before the IRS can legally assess and begin collection efforts. Failing to file a petition within the 90-day window means you forfeit your right to challenge the assessment in Tax Court.
- Pay and Pursue a Refund: You can pay the full amount of the assessed tax, and then file a claim for a refund. If the IRS denies the refund claim, you could then pursue litigation in a U.S. District Court or the Court of Federal Claims.
Crucial Warning: The 90-day deadline is non-negotiable and cannot be extended by the IRS. If you miss this deadline and haven't filed a petition in Tax Court, the IRS will formally assess the deficiency, and the proposed amount becomes legally due, opening the door for immediate collection actions (such as liens and levies).