30-Day Letter

What Is IRS Letter 950?

IRS Letter 950 is the formal 30-day letter the IRS issues after completing a field audit of your tax return. It communicates the revenue agent's proposed adjustments, including any additional tax, penalties, and interest, and notifies you of your right to request an administrative appeal with the IRS Independent Office of Appeals. Letter 950 is part of the examination track, which means the proposed tax has not been assessed against your account and you still have the opportunity to dispute every adjustment before the IRS makes any changes final.

Understanding the distinction between the examination track and the collection track is essential. On the examination track, the IRS is proposing changes based on its review of your records. Nothing has been formally assessed, and your appeal rights are at their strongest. On the collection track, the IRS has already assessed the tax and is pursuing payment. Letter 950 sits firmly on the examination side of this divide, and taxpayers who respond strategically at this stage frequently achieve better outcomes than those who wait until the IRS issues a statutory Notice of Deficiency.

Multiple variants of Letter 950 exist, designated 950-A through 950-Z, covering different case types and examination scenarios. The IRS issues the appropriate variant based on the nature of the audit. Whether the examination involved individual income tax, employment tax under IRM 4.23.22, estate and gift tax under IRM 4.25.10, or exempt organization issues under IRM 4.8.9, the 30-day letter follows the procedures established in IRM 4.10.8.12. The IRS derives its examination authority from IRC §7602, which grants the agency the power to examine books, records, and witnesses to determine the correctness of any return.

How Does Letter 950 Differ from Letter 525?

Both Letter 950 and Letter 525 are 30-day letters that propose adjustments and offer appeal rights, but they originate from fundamentally different types of audits. Letter 525 is issued after a correspondence audit, which is conducted entirely by mail. The IRS sends document requests, the taxpayer responds with records, and the correspondence examiner makes a determination based on the paper file. Correspondence audits account for approximately 75% of all IRS audits and typically involve simpler issues such as a single deduction, a credit verification, or an income document mismatch.

Letter 950 is issued after a field audit, which is an in-person examination conducted by an IRS revenue agent at the taxpayer's home, business, or representative's office. Field audits are reserved for the most complex returns and typically involve larger dollar amounts, multiple tax years, and issues that require direct inspection of records and interviews with the taxpayer or their employees. Field audits cover a broader range of tax types than correspondence audits. Employment tax examinations follow the procedures outlined in IRM 4.23.22, estate and gift tax examinations follow IRM 4.25.10, and exempt organization examinations follow IRM 4.8.9. Each of these case types produces its own variant of the Letter 950 series.

The practical implication is that a Letter 950 response requires a more formal and thorough approach than a Letter 525 response. Field audit adjustments tend to involve more complex factual and legal issues, larger proposed deficiencies, and a more detailed examination report (Form 4549 or Form 4549-A). The revenue agent has spent weeks or months building the case, and your response must address each proposed adjustment with specific facts, documentation, and legal authority. Working with a professional who understands the audit defense process is critical at this stage.

How Should You Respond to Letter 950?

Your response to Letter 950 depends on the total amount of the proposed adjustment. If the total proposed changes to income tax, penalties, and interest for any single tax period are $25,000 or less, you can file a small case request using Form 12203 (Request for Appeals Review). This is a simplified one-page form that identifies the items you disagree with and provides a brief explanation of your position. Small case requests are processed more quickly and do not require the same level of formality as a full written protest.

For proposed adjustments exceeding $25,000, the IRS requires a formal written protest. The protest must include specific elements prescribed by IRS procedures: your name, address, and Social Security number or Employer Identification Number; a statement that you want to appeal the proposed changes to the IRS Independent Office of Appeals; the date and symbols from the letter; the tax periods involved; an itemized list of the adjustments you disagree with; a statement of the facts supporting your position for each disputed item; a statement of the applicable law or authority supporting your position; and a declaration under penalties of perjury that the facts stated are true, correct, and complete.

The deadline to respond is 30 days from the date printed on the letter. This deadline is administrative rather than statutory, meaning it can sometimes be extended by contacting the revenue agent or their manager. However, allowing the 30-day period to lapse without requesting an extension is risky. If you do not respond, the IRS proceeds to issue a Notice of Deficiency (the 90-day letter) under IRC §6212, which starts a statutory clock that cannot be extended. According to IRS examination statistics, taxpayers who engage the Appeals process after a field audit achieve more favorable outcomes than those who allow the case to proceed to a Notice of Deficiency without contesting the proposed adjustments.

Tax Forgiveness Pro, backed by a licensed law firm, prepares formal written protests that address each proposed adjustment with the specific facts, documentation, and legal authority required to build a strong case at Appeals. Our team reviews the revenue agent's workpapers, examination report, and the underlying tax law to identify every viable argument before the protest deadline. If you need help with any aspect of the tax resolution process, our professionals are ready to assist.

What Happens at IRS Appeals After Letter 950?

Once your protest or small case request is received, the IRS assigns your case to an Appeals officer within the Independent Office of Appeals. The Appeals officer is independent from the examination division and is not bound by the revenue agent's conclusions. Appeals officers are trained to evaluate cases based on the "hazards of litigation," which means they assess the probability that the IRS would prevail on each issue if the case were litigated in court. This framework gives Appeals officers significant settlement authority that the original examiner does not have.

During the Appeals conference, the Appeals officer reviews the examination report, your protest, and any additional evidence you present. You or your representative can explain your position on each disputed item, introduce new documentation, and make legal arguments. The Appeals officer can concede issues entirely, split disputed amounts, or propose a settlement that reflects the litigation hazards on both sides. The IRS reports that the majority of cases reaching Appeals are resolved at this stage without requiring litigation. Appeals conferences can be conducted in person, by telephone, or by video conference, depending on the complexity of the case and the preferences of the parties.

If you and the Appeals officer reach an agreement, you sign a closing agreement (Form 906 or Form 870-AD) that settles the disputed issues. If you cannot reach an agreement on some or all of the issues, the IRS proceeds to issue a statutory Notice of Deficiency under IRC §6212. This notice, commonly called the 90-day letter, gives you 90 days (150 days if mailed to an address outside the United States) to file a petition with the United States Tax Court under IRC §6213(a). Filing a Tax Court petition preserves your right to have the case heard by an independent judge before you are required to pay the disputed tax. For cases involving employment tax, the taxpayer may also have jurisdiction options under IRC §7436, which governs Tax Court review of employment status determinations.

What Penalty Defenses Are Available?

Field audits frequently result in proposed penalties in addition to the underlying tax adjustment. The most common penalties include the accuracy-related penalty under IRC §6662 (20% of the underpayment attributable to negligence, substantial understatement, or other specified conduct), the gross valuation misstatement penalty under IRC §6662(h) (40% of the underpayment in cases involving overvalued property or understated basis), and the civil fraud penalty under IRC §6663 (75% of the underpayment attributable to fraud). Each penalty carries different legal standards and defense strategies.

One of the most powerful penalty defenses available is the supervisory approval requirement under IRC §6751(b)(1). This statute requires that the initial determination of any assessable penalty must be personally approved in writing by the immediate supervisor of the individual making the determination. The Tax Court decisions in Graev v. Commissioner and Chai v. Commissioner established that the IRS bears the burden of proving that this written supervisory approval was obtained before the penalty was communicated to the taxpayer. If the IRS cannot produce documentation showing that the revenue agent's supervisor approved the penalty in writing before it was included in the 30-day letter, the penalty must be removed regardless of whether the underlying conduct would otherwise justify it.

Beyond the supervisory approval defense, taxpayers can assert the reasonable cause defense under IRC §6664(c). This defense requires showing that you acted in good faith and that there was reasonable cause for the position taken on your return. Reliance on professional advice from a qualified tax advisor is one form of reasonable cause, provided the advice was based on all pertinent facts and circumstances and the advisor had the appropriate expertise. The IRS considers factors such as the taxpayer's education, business experience, and the nature and complexity of the tax issue when evaluating reasonable cause claims.

A practical step in building your penalty defense is to request the revenue agent's workpapers through a Freedom of Information Act (FOIA) request. These workpapers document the examiner's analysis, including the penalty computation and any supervisory approval documentation. Reviewing the workpapers allows your representative to verify whether IRC §6751(b)(1) was satisfied and to identify any procedural deficiencies that strengthen your case. Tax Forgiveness Pro, backed by a licensed law firm, routinely obtains and reviews examination workpapers as part of our audit defense representation to ensure every available defense is raised on your behalf.

When Should You Get Professional Help?

Letter 950 is issued after a field audit, which is the most intensive type of IRS examination. By the time you receive this letter, a revenue agent has spent weeks or months reviewing your records, interviewing you or your employees, and building a case for the proposed adjustments. The stakes at this stage are significantly higher than a routine correspondence audit, and the procedural requirements for responding are more demanding.

Professional representation is particularly important in several scenarios. If the proposed adjustment exceeds $25,000, you must file a formal written protest with specific legal and factual arguments rather than a simple Form 12203. If the IRS has proposed accuracy-related penalties under IRC §6662, civil fraud penalties under IRC §6663, or any other assessable penalty, the supervisory approval defense under IRC §6751(b)(1) must be investigated and preserved. If the field audit involved employment tax issues, the legal framework under IRC §7436 creates additional procedural considerations that require professional guidance.

Tax Forgiveness Pro is backed by a licensed law firm that represents taxpayers through every phase of the examination and appeals process. Our team files Powers of Attorney (Form 2848) so you never need to communicate with the IRS directly. We review the examination report and revenue agent's workpapers, prepare formal written protests, represent you at Appeals conferences, and if necessary, preserve your right to petition the Tax Court. The earlier you involve professional representation after receiving Letter 950, the more options remain available. Once the 30-day protest deadline passes and the IRS issues a Notice of Deficiency, the case moves to a statutory timeline that limits flexibility.

If you have received IRS Letter 950 or any 30-day letter following a field audit, contact Tax Forgiveness Pro for a free consultation to discuss your options. Our attorney-backed team evaluates your examination report, identifies defensible positions, and builds a strategy designed to achieve the best possible outcome at Appeals.