Letter 531 is a statutory notice of deficiency, often called a 90-day letter. It states the tax and penalties the IRS intends to assess and gives you a final date to petition the U.S. Tax Court without first paying the disputed amount.
The Date on the Letter Controls
The petition deadline is generally 90 days from the notice date, or 150 days when the notice is addressed outside the United States. Use the exact last date printed on the notice. Calling the IRS, sending documents, or asking for reconsideration does not extend that statutory deadline.
What to Do
Compare the proposed changes with the return and prior examination correspondence. If you disagree and want Tax Court review, make sure a valid petition is filed on time. You may continue trying to resolve the case administratively, but do not let those discussions consume the petition period.
If you've received Letter 531, call us at (813) 229-7100. A missed Tax Court deadline can eliminate prepayment review.