Audit Examination Report

IRS Letter 525 is a formal examination report sent to taxpayers at the conclusion of a correspondence audit. It notifies you that the IRS has reviewed your return under its examination authority granted by IRC §7602 and is proposing specific changes, including additional tax owed, penalties, and interest. Letter 525 falls on the examination track of IRS proceedings, which means the proposed tax has not been assessed yet and you retain full rights to dispute the findings before any amount becomes a legal liability on your account.

What Is IRS Letter 525?

IRS Letter 525 is the written report the IRS sends after completing a correspondence examination of your federal tax return. The IRS initiates correspondence audits under the authority of IRC §7602, which grants the Service the power to examine books, records, and any other data relevant to determining the correctness of a return. Letter 525 marks the point at which the IRS has finished its review and is formally presenting proposed adjustments for the taxpayer to accept or dispute.

Understanding the distinction between the examination track and the collection track is critical. Letter 525 is an examination-track document. The IRS is proposing changes, not demanding payment. No assessment has been made. No lien has been filed. No levy authority exists. The proposed tax, penalties, and interest shown in Letter 525 are the IRS's position based on the information it reviewed, and you have the legal right to challenge that position through administrative appeal or, ultimately, through the United States Tax Court. According to IRS data, approximately 75% of all individual audits are conducted by correspondence, making Letter 525 one of the most common examination reports taxpayers receive.

Correspondence audits typically focus on specific line items rather than the entire return. The IRS may have questioned deductions, credits, income reporting, or filing status. If the IRS determined that adjustments are warranted based on the records it reviewed (or did not receive), Letter 525 is the vehicle through which those adjustments are communicated. If you need professional representation during the examination process, the audit defense team at Tax Forgiveness Pro handles every stage of the process from initial response through appeals and Tax Court petitions.

What Does Letter 525 Contain?

Letter 525 includes several documents that together form the complete examination report. The primary enclosure is Form 4549 (Income Tax Examination Changes), which shows the specific line-by-line adjustments the IRS is proposing. Form 4549 lists the original amounts reported on your return, the corrected amounts per the IRS examination, and the resulting change to your tax liability. It also calculates the total additional tax, applicable penalties, and interest owed through the anticipated assessment date.

In many cases, Letter 525 also includes Form 886-A (Explanation of Items), which provides the IRS examiner's detailed rationale for each proposed adjustment. Form 886-A explains what the IRS examined, what documentation was or was not provided, which sections of the Internal Revenue Code apply, and why the examiner concluded that a change was warranted. This document is essential for preparing a response because it reveals the specific legal and factual basis for the IRS's position.

Penalties are a significant component of most Letter 525 reports. The most common penalty proposed in examination reports is the 20% accuracy-related penalty under IRC §6662, which applies to underpayments attributable to negligence, disregard of rules or regulations, or substantial understatement of income tax. A substantial understatement exists when the understatement exceeds the greater of 10% of the correct tax or $5,000 for individuals. The penalty is calculated as 20% of the portion of the underpayment attributable to the specified conduct.

An important defense against penalties proposed in Letter 525 involves IRC §6751(b)(1), which requires that the initial determination of a penalty assessment be personally approved in writing by the immediate supervisor of the individual making the determination. The Tax Court has enforced this requirement rigorously in cases including Graev v. Commissioner and Chai v. Commissioner, holding that the IRS bears the burden of proving supervisory approval was obtained before penalties were formally communicated to the taxpayer. If the IRS cannot demonstrate that supervisory approval was timely obtained, the penalties must be removed regardless of their substantive merits. Under IRC §7491(c), the IRS bears the burden of production with respect to penalties, meaning it must come forward with evidence establishing that the penalty is appropriate.

How Should You Respond to Letter 525?

You have three options when responding to Letter 525, and the response you choose depends on whether you agree with the IRS's proposed changes. First, if you agree with all proposed adjustments, sign the enclosed Form 4549 and return it to the IRS within the 30-day response period. The IRS will then assess the additional tax, and you will receive a bill for the balance due. You can pay in full or explore IRS payment plan options if the balance exceeds what you can pay immediately.

Second, if you agree with some adjustments but disagree with others, you can submit a partial agreement. Indicate which items you accept and provide documentation or legal arguments supporting your position on the items you dispute. A partial agreement is often a strategic choice when certain adjustments are clearly supported by the IRS's records but others involve issues of interpretation, valuation, or substantiation where the taxpayer has a legitimate basis for disagreement.

Third, if you fully disagree with the proposed changes, you must submit a written response contesting the adjustments. The method depends on the dollar amount at stake. For total proposed changes of $25,000 or less (including additional tax, penalties, and interest for any single tax year), you can file Form 12203, Request for Appeals Review. Form 12203 is a simplified small case request that does not require a formal legal brief. For proposed changes exceeding $25,000, you must submit a formal written protest that includes a statement of the facts, a discussion of the applicable law, and the arguments supporting your position on each disputed item. The written protest must be signed under penalties of perjury.

Regardless of which option you choose, the deadline is critical. You generally have 30 days from the date of Letter 525 to respond. If you need additional time to gather records or consult with a tax professional, contact the IRS examiner listed on the letter to request an extension before the deadline expires. Failing to respond or request an extension within the 30-day window triggers the next step in the examination process, which has significantly more serious consequences. The tax resolution professionals at Tax Forgiveness Pro can evaluate your Letter 525 and determine the strongest response strategy for your specific situation.

What Happens at an IRS Appeals Conference?

If you request Appeals review (via Form 12203 or formal written protest), your case is transferred from the IRS examination division to the IRS Independent Office of Appeals. Appeals is organizationally separate from the examination function, and Appeals officers are trained to evaluate cases from a settlement perspective rather than an enforcement perspective. The examination procedures governing this transition are documented in IRM 4.10.8.

Appeals officers have the authority to settle cases based on the "hazards of litigation," which means they evaluate the likelihood that the IRS would prevail if the case went to Tax Court. If the IRS's position on a particular issue has a 60% chance of being sustained in court, the Appeals officer may offer to concede 40% of the adjustment. This hazards-based approach means that well-prepared taxpayers with strong factual or legal arguments frequently achieve substantial reductions at the Appeals level without ever filing a Tax Court petition.

The Appeals conference itself is typically an informal meeting conducted by phone or video, though in-person conferences are available in some cases. The Appeals officer reviews the examination file, considers the taxpayer's arguments and documentation, and proposes a settlement. Both sides can negotiate. According to IRS data, the majority of cases that reach Appeals are resolved at that level without proceeding to Tax Court, making Appeals the most efficient and cost-effective dispute resolution mechanism available to taxpayers.

Tax Forgiveness Pro, backed by a licensed law firm, represents taxpayers through the entire Appeals process. Our team prepares the protest or small case request, assembles supporting documentation, presents legal arguments to the Appeals officer, and negotiates the best possible outcome. If Appeals does not produce an acceptable resolution, we advise on the next steps, including Tax Court petition options.

What If You Don't Respond to Letter 525?

If you do not respond to Letter 525 within the 30-day deadline and do not request an extension, the IRS issues a Notice of Deficiency, commonly called the 90-Day Letter, under IRC §6212. The Notice of Deficiency is a statutory document that formally notifies the taxpayer of the IRS's determination and triggers the taxpayer's right to petition the United States Tax Court. Under IRC §6213(a), you have 90 days from the date of the Notice of Deficiency (150 days if the notice is addressed to a person outside the United States) to file a petition with the Tax Court.

The 90-day deadline to petition Tax Court is absolute and jurisdictional. Courts have consistently held that there is no equitable tolling of this deadline, meaning that even a one-day delay forfeits your right to challenge the IRS's determination in Tax Court before paying the assessed amount. If you miss the 90-day window, the proposed tax, penalties, and interest from Letter 525 are assessed in full and become a legally enforceable liability on your account. The case then moves from the examination track to the collection track, and the IRS gains access to its full range of collection tools, including federal tax liens, bank levies, and wage garnishments.

Once the tax is assessed through the collection track, your options change fundamentally. You can still dispute the underlying tax through a claim for refund (pay first, then sue in federal district court or the Court of Federal Claims), but this is far more expensive and time-consuming than resolving the dispute at the examination or Appeals level. The IRS assessed approximately $53.3 billion in additional tax through examinations in fiscal year 2022. A significant portion of that total included cases where taxpayers did not respond to their 30-day letter, forfeiting their most efficient path to resolution.

When Should You Get Professional Help?

While simple correspondence audit adjustments involving small dollar amounts can sometimes be handled independently, several situations strongly warrant professional representation. If the proposed adjustments exceed $10,000 in additional tax, the financial stakes justify engaging a licensed tax professional who understands examination procedures, penalty defenses, and Appeals negotiation strategies. Complex adjustments involving business income, rental property, multi-year issues, or international reporting requirements also benefit significantly from professional handling.

Penalty disputes are another area where professional representation produces measurably better outcomes. Challenging the 20% accuracy-related penalty under IRC §6662 requires demonstrating reasonable cause and good faith under IRC §6664(c), or establishing that supervisory approval was not timely obtained under IRC §6751(b)(1). These defenses involve specific legal standards and procedural requirements that a qualified representative can navigate far more effectively than an unrepresented taxpayer.

If you received IRS Letter 525 and are uncertain how to proceed, responding within the 30-day deadline is the single most important step you can take. Every day of delay reduces your options. Tax Forgiveness Pro, backed by a licensed law firm, provides a free initial consultation to review your Letter 525, assess your defenses, and recommend the strongest response strategy. Our team handles the entire process, from preparing your response through Appeals negotiation, so you never need to communicate with the IRS directly.

Schedule your free consultation today to have our attorney-backed team review your IRS Letter 525 and protect your rights before the response deadline passes.