Guides
You Missed the 90-Day Deadline. Now What?
You received a Notice of Deficiency. The 90-day deadline passed. The IRS assessed the tax. Here's what you can still do.
Guides
Practical explanations of Tax Court procedures, deadlines, and forms.
Guides
Small Case or Regular Case: Which Should You Choose?
If your dispute is under $50,000, you can sometimes choose simplified procedures — but you give up the right to appeal. Here's how to decide.
Guides
You Just Got a 90-Day Letter From the IRS. Here's What It Means.
A 90-day letter is your ticket to Tax Court — and your deadline to use it. Here's what it means and what to do next.