When the U.S. Tax Court Beckons … (What is an IRS “Notice of Deficiency” and How Can you Appeal)
- Nick Kokis

- Sep 28, 2025
- 3 min read
Receiving an IRS Notice of Deficiency can be a concerning and overwhelming experience for any taxpayer. This official communication indicates that the IRS has proposed changes to your tax return and believes that you owe additional taxes. As a tax attorney with experience in handling such matters, I understand the importance of taking immediate action to protect your rights and respond effectively. In this blog post, I will provide you with practical guidance on what to do when you receive an IRS Notice of Deficiency. Carefully Review the Notice: Upon receiving the Notice of Deficiency, take the time to read it thoroughly. This notice, also known as a "90-Day Letter," outlines the proposed changes to your tax return and specifies the amount of additional tax the IRS believes you owe. Understand the basis for the proposed adjustments and ensure you have a clear understanding of the issues at hand. Understand Your Rights: As a taxpayer, you have important rights when responding to a Notice of Deficiency. One crucial right is the ability to challenge the IRS's proposed adjustments by filing a petition with the United States Tax Court. Familiarize yourself with your rights, including the deadlines for filing a petition, as outlined in the notice. It's essential to be aware of these rights to protect your interests and explore all available options. Consult with a Tax Attorney: Given the complexity and potential implications of responding to a Notice of Deficiency, it is strongly recommended to seek professional assistance from a tax attorney. A qualified attorney can review the notice, evaluate the IRS's proposed adjustments, and provide expert advice on the best course of action. They will guide you through the process and help ensure your rights are protected. Gather Supporting Documentation: To effectively challenge the IRS's proposed adjustments, you will need to gather and organize all relevant supporting documentation. This includes receipts, bank statements, invoices, and any other evidence that substantiates your original tax return positions. Thorough documentation is vital for presenting a strong case and demonstrating that the IRS's proposed adjustments are incorrect. Consider Requesting an IRS Conference: Before filing a petition with the Tax Court, you have the option to request an IRS conference. This gives you an opportunity to discuss your case with an IRS appeals officer and potentially resolve the issue without going to court. A tax attorney can represent you during the conference and help present your case effectively. File a Petition with the Tax Court, if Necessary: If you are unable to reach a satisfactory resolution through an IRS conference or if the conference is not available, filing a petition with the Tax Court is the next step. This legal action initiates a review of the proposed adjustments by a neutral judge. It's crucial to adhere to the deadline stated in the Notice of Deficiency when filing your petition. Prepare a Strong Case: When preparing your case for the Tax Court, work closely with your tax attorney to develop a persuasive argument and gather all necessary evidence. Your attorney will guide you through the process, help draft the petition, and represent your interests in court. Explore Settlement Options: Throughout the process, it may be possible to explore settlement options with the IRS. Your tax attorney can negotiate on your behalf, aiming to reach a mutually acceptable resolution that minimizes your tax liability and potential penalties. Conclusion: Receiving an IRS Notice of Deficiency can be a challenging situation, but with the right approach and professional assistance, you can effectively respond and protect your rights. By carefully reviewing the notice, understanding your rights, consulting with a tax attorney, and preparing a strong case, you can navigate the process with confidence. Remember, a tax attorney can provide invaluable support throughout the Notice of Deficiency response process, ensuring your interests are safeguarded.




