Understanding Your Tax Assessment Is the First Step to Resolving It.

Receiving a notice from the IRS or the Wisconsin Department of Revenue stating that you owe additional taxes can feel overwhelming — especially when you are not sure how that number was calculated, whether it is correct, or what happens next. A tax assessment is the IRS's or state's formal determination of what you owe, and once it becomes final, the government gains powerful tools to collect it.

At Bender Law, we help individuals and small businesses in Watertown and throughout Wisconsin understand how tax assessments work, identify whether an assessment is accurate, and take timely action to challenge, reduce, or resolve assessments through the appropriate legal channels. Whether you are at the earliest stages of an IRS inquiry or already facing collection on a finalized assessment, our attorneys can help you find a path forward.

What Is a Tax Assessment?

A tax assessment is the official process by which the IRS — or the Wisconsin Department of Revenue — records the amount of tax a taxpayer owes. It is the formal legal act that gives the government the authority to collect that tax. Until a tax is assessed, the IRS generally cannot pursue collection actions such as liens, levies, or wage garnishment.

There are several types of IRS tax assessments:

• Self-Assessment — The most common form. When you file a tax return, you are essentially self-assessing your tax liability. The IRS records the amount you reported, and it becomes your assessed tax for that year.
• Deficiency Assessment — When the IRS audits your return and determines you owe more than you reported, it proposes a deficiency. If you do not challenge the deficiency within the applicable deadlines — including the 90-day window provided in a Notice of Deficiency — the IRS assesses the additional tax. This assessment then carries the full force of law.
• Substitute for Return (SFR) Assessment — If you fail to file a required tax return, the IRS may prepare a Substitute for Return on your behalf using available third-party information (W-2s, 1099s, etc.). The resulting assessment is typically unfavorable because the IRS does not account for deductions, credits, or exemptions you would have claimed.
• Trust Fund Recovery Penalty Assessment — Business owners and responsible parties who fail to withhold and remit payroll taxes (such as Social Security, Medicare, and income tax withholding) can be personally assessed a Trust Fund Recovery Penalty equal to the unremitted taxes. This assessment reaches beyond the business and attaches to the individual.
• Amended Return Assessment — When you file an amended return (Form 1040-X) reporting additional tax owed, the IRS assesses the difference. This is generally a voluntary self-correction.
• Audit Assessment — Following a completed examination in which you agreed to the IRS's proposed adjustments, the IRS formally assesses the agreed-upon additional tax.

How the IRS Assessment Process Works

Understanding the stages of the IRS assessment process helps you recognize where you are in the process — and where your opportunities to respond or challenge still exist.

1. Return Filing or IRS Identification — The process typically begins either with a tax return you filed or with the IRS identifying a potential issue through its automated systems, an audit selection, or a matching program that compares third-party information reports against filed returns.
2. IRS Examination (Audit) — If the IRS selects your return for examination, it may conduct a correspondence audit (by mail), an office audit (at an IRS office), or a field audit (at your home or business). The IRS reviews your records, questions specific items on your return, and proposes adjustments where it believes you underreported income or overclaimed deductions.
3. Proposed Adjustments and 30-Day Letter — After an audit, the IRS typically issues a 30-day letter (also called a Revenue Agent Report or RAR) explaining the proposed changes and giving you 30 days to agree, disagree, or request a conference with the IRS Office of Appeals. This is an important early opportunity to challenge the IRS's position before a formal assessment is made.
4. IRS Office of Appeals — If you disagree with the auditor's findings and timely request a conference, your case moves to the IRS Office of Appeals — an independent branch of the IRS that reviews disputes with fresh eyes. Many tax disputes are resolved at this stage without ever reaching Tax Court.
5. Notice of Deficiency (90-Day Letter) — If no agreement is reached at Appeals — or if you did not respond to earlier notices — the IRS issues a formal Notice of Deficiency. This triggers your right to petition the U.S. Tax Court within 90 days. If no petition is filed within that window, the assessment becomes final automatically.
6. Assessment Becomes Final — Once the 90-day period expires without a Tax Court petition, or once a Tax Court case is resolved, the IRS formally records the assessment. From this point, the IRS can file a tax lien against your property and pursue collection actions including bank levies and wage garnishment.
7. Collection — After assessment, the IRS begins the collection process. Collection options include voluntary payment, installment agreements, currently not collectible status, and — for eligible taxpayers — an Offer in Compromise to settle the debt for less than the full amount owed

IRS Statutes of Limitations on Assessment

The IRS does not have unlimited time to assess additional taxes. Federal law establishes statutes of limitations that restrict when the IRS can make an assessment — and understanding these deadlines can be a critical part of your defense.

General Rule: Three Years

In most cases, the IRS has three years from the date a tax return was filed (or the return due date, whichever is later) to assess additional tax. If the IRS does not assess within that window, it generally loses the right to do so. This three-year clock is one of the most important protections available to taxpayers.

Extended Period: Six Years

If a taxpayer omits more than 25 percent of their gross income from a tax return, the statute of limitations extends to six years. This extended period gives the IRS more time to identify and assess significant underreporting.

No Limit: Fraud or No Return Filed

There is no statute of limitations when a taxpayer files a fraudulent return with the intent to evade tax, or when no return is filed at all. In these situations, the IRS can assess additional tax at any time — even years or decades later.

Tolling and Suspension

Certain events pause or extend the assessment period. Filing a Tax Court petition, submitting an Offer in Compromise, or entering into a written agreement to extend the statute of limitations (Form 872) all toll the running clock. Understanding whether the IRS's assessment window is still open — or has already expired — is sometimes the most important threshold question in a tax dispute.

Statute of Limitations Defense

If the IRS attempts to assess additional tax after the applicable statute of limitations has expired, that assessment is legally invalid and can be challenged. This defense is not automatic — you must raise it. An attorney can evaluate whether the IRS's assessment was timely and advise you on how to assert this defense if it applies to your situation.

Challenging a Tax Assessment

The right to challenge a tax assessment depends heavily on where you are in the process. The earlier you act, the more options you have.

Before Assessment: During Audit or Appeals

The most effective place to challenge an incorrect tax determination is before the assessment is made — during the audit examination phase or before the IRS Office of Appeals. At this stage, you can present documentation, legal arguments, and factual corrections directly to the examining agent or Appeals officer. Resolving a dispute at this stage avoids the formality and expense of Tax Court litigation.

After the 30-Day Letter: IRS Appeals

If you receive a 30-day letter following an audit and disagree with the proposed adjustments, requesting a conference with the IRS Office of Appeals is typically your next step. Appeals officers are independent of the audit function and are authorized to settle cases based on the hazards of litigation — meaning they weigh the likelihood that the IRS would prevail in court and may accept less than the full proposed amount to avoid that uncertainty.

After the Notice of Deficiency: Tax Court

If the audit and Appeals process does not produce a resolution, the IRS issues a Notice of Deficiency giving you 90 days to petition the U.S. Tax Court. Filing a timely petition allows you to challenge the proposed assessment in an independent federal court before paying any of the disputed tax. This is the last pre-assessment opportunity to contest the IRS's determination through the courts.

After Assessment: Audit Reconsideration

If an assessment has already been made — for example, because you did not respond to the Notice of Deficiency in time — you may still request audit reconsideration from the IRS. This process allows you to present new information, documentation, or arguments that were not available or considered during the original examination. Audit reconsideration does not suspend collection, but a successful reconsideration can reduce or eliminate the assessed amount.

After Assessment: Pay and Claim Refund

Once an assessment is final, another avenue for challenging an incorrect tax is to pay the full assessed amount and file a formal claim for a refund with the IRS. If the IRS denies the refund claim, you may then sue for the refund in U.S. District Court or the U.S. Court of Federal Claims. This path requires paying first — but it preserves your ability to litigate the underlying tax dispute.

Wisconsin Tax Assessments: State-Level Considerations

In addition to federal IRS assessments, Wisconsin residents and businesses may face tax assessments from the Wisconsin Department of Revenue (DOR). Understanding both levels — and how they interact — is essential for complete tax dispute resolution.

Wisconsin DOR Assessment Process

The Wisconsin DOR has its own examination and assessment process, governed primarily by Wisconsin Statutes Chapter 71 (income and franchise taxes) and Chapter 77 (sales and use taxes). When the Wisconsin DOR determines that additional tax is owed, it issues a notice of additional tax due. Taxpayers have the right to contest Wisconsin DOR assessments through the Wisconsin Tax Appeals Commission — an independent state agency that reviews tax disputes — and ultimately through the Wisconsin court system

Federal-State Conformity and Ripple Effects

Wisconsin generally conforms to federal tax law in many areas, and the Wisconsin DOR actively monitors IRS audit results. When the IRS makes a final assessment of additional federal income tax, Wisconsin law generally requires the taxpayer to report that adjustment to the Wisconsin DOR within 180 days. Failure to do so can result in the Wisconsin DOR making its own assessment — sometimes years later — along with penalties and interest. Managing a federal tax dispute with an eye toward its Wisconsin implications is an important part of comprehensive tax controversy representation.

Wisconsin Statute of Limitations

Wisconsin's statute of limitations for income tax assessments is generally four years from the later of the return's due date or filing date — slightly longer than the federal three-year period under Wis. Stat. § 71.74. Extended periods apply in cases of substantial understatement or fraud, consistent with the additional scrutiny those situations warrant

What Happens After an Assessment: IRS Collection

Once a tax assessment becomes final, the IRS can pursue collection through a range of enforcement tools. Understanding what the IRS can and cannot do — and what protections remain available — is critical at this stage.

IRS Collection Actions Following Assessment

Federal Tax Lien — The IRS may file a Notice of Federal Tax Lien, which attaches to all of your current and future property and is a matter of public record. A lien can affect your ability to sell property, obtain credit, or conduct business.

Levy — The IRS may issue a levy that directs third parties (banks, employers, tenants) to turn over funds or property to satisfy the tax debt. Bank levies can freeze and drain accounts; wage levies are continuous and redirect a portion of each paycheck.

Seizure — In serious cases, the IRS may seize and sell real property, vehicles, or business assets to satisfy a tax debt.

Passport Denial or Revocation — For taxpayers with seriously delinquent tax debt (currently over $65,000), the IRS may certify the debt to the State Department, which can result in denial or revocation of a U.S. passport.

Even after an assessment, taxpayers retain important rights. You have the right to a Collection Due Process (CDP) hearing before certain levy actions take place, during which you can raise challenges to the collection action and propose alternatives such as an installment agreement or Offer in Compromise. Our attorneys can represent you through the CDP process and help you pursue the best available resolution.

Who We Represent

Our tax assessment practice serves individuals and small businesses throughout Watertown and southeastern Wisconsin at every stage of the IRS and Wisconsin DOR assessment process, including:

• Individuals who have received an IRS audit notice or examination report
• Taxpayers who received a 30-day letter proposing adjustments and want to challenge the IRS's findings
• Individuals who received a Notice of Deficiency and need to evaluate their Tax Court options
• Taxpayers who did not respond to prior IRS notices and are now facing a finalized assessment
• Business owners facing Trust Fund Recovery Penalty assessments for unpaid payroll taxes
• Individuals facing IRS collection actions — liens, levies, or wage garnishment — following assessment
• Taxpayers seeking audit reconsideration after a final assessment was made without their input
• Wisconsin residents dealing with Wisconsin DOR assessments or the state ripple effects of a federal audit
• Individuals or businesses who believe the IRS's statute of limitations to assess has expire

How We Can Help

Bender Law provides comprehensive representation for Wisconsin taxpayers at every stage of the tax assessment and collection process. Our services include:

• Reviewing IRS audit notices, Revenue Agent Reports, and proposed assessments
• Representing taxpayers before the IRS Office of Appeals
• Filing Tax Court petitions and representing clients in U.S. Tax Court proceedings
• Asserting statute of limitations defenses when the IRS's assessment window has expired
• Requesting audit reconsideration with supporting documentation after a final assessment
• Representing taxpayers in Collection Due Process hearings
• Negotiating installment agreements and currently not collectible status to manage assessed debt
• Pursuing Offers in Compromise to settle assessed tax debt for less than the full amount owed
• Addressing Trust Fund Recovery Penalty assessments for business owners and responsible parties
• Managing Wisconsin DOR assessments and required federal adjustment reporting
• Coordinating federal and state tax dispute resolution as part of a unified strate

Why Clients Choose Bender Law

Full Lifecycle Representation — We represent taxpayers at every stage of the IRS assessment process, from the first audit notice through collection resolution. You do not need to find a different attorney as your situation evolves.

Honest, Strategic Advice — We assess the strength of the IRS's position honestly and advise you on where to fight, where to concede, and how to achieve the best realistic outcome — not just the outcome you want to hear.

Local Knowledge, Broad Legal Depth — As a full-service firm rooted in Watertown and Jefferson County, we understand how a tax assessment can intersect with your business, estate, real estate, and family legal matters. We bring the full scope of our practice to bear when it matters.

Clear Communication — Tax law involves complex procedures and strict deadlines. We explain every step in plain language, flag critical dates proactively, and make sure you are never caught off guard.

Frequently Asked Questions

What is the difference between a tax assessment and a tax audit?

An audit is the IRS's process of examining your tax return to verify its accuracy. An assessment is the formal legal act of recording the amount of tax owed. An audit may lead to an assessment if the IRS determines that additional tax is due and the dispute is not resolved before the assessment deadline. Not all audits result in additional assessments — many are closed with no change, or even result in a refund.

How do I know if the IRS has already assessed a tax against me?

You can request a tax transcript from the IRS — specifically a Tax Account Transcript or a Record of Account — which shows all assessments, payments, and credits recorded for a given tax year. An IRS assessment will appear as a specific transaction code on the transcript. Our attorneys can help you obtain and interpret your transcripts to understand exactly what the IRS has and has not assessed.

Can the IRS assess tax for years that are more than three years old?

Generally, no — the IRS has three years from the date a return was filed or due (whichever is later) to assess additional tax. However, there are important exceptions: the period extends to six years for substantial omissions of income, and there is no time limit at all if a fraudulent return was filed or no return was filed. If you believe the IRS is attempting to assess tax outside the applicable limitations period, this is a defense that must be raised affirmatively and promptly.

I received a letter from the IRS saying I owe taxes, but I never received an audit notice. What happened?

This is common. The IRS uses automated systems — including the Automated Underreporter Program (AUR) and Automated Substitute for Return program — that can generate proposed assessments without a traditional audit. If you received income reported on a W-2, 1099, or other information return that does not appear on your filed return, the IRS may have proposed or assessed additional tax through these automated processes. Responding promptly — before the assessment becomes final — is critical.

What is a Trust Fund Recovery Penalty, and can it be assessed against me personally?

A Trust Fund Recovery Penalty (TFRP) is a personal liability assessment imposed on individuals who are responsible for collecting and remitting payroll taxes — such as Social Security, Medicare, and withheld income taxes — on behalf of a business, and who willfully failed to do so. The IRS can assess this penalty against any "responsible party," which may include business owners, officers, shareholders, or even bookkeepers, depending on the facts. The TFRP is dollar-for-dollar equal to the unpaid trust fund taxes and can be pursued even after the business closes. If you have received a proposed TFRP assessment, acting immediately is essential.

What options do I have if the IRS has already assessed a large tax debt and begun collection?

Even after a final assessment and the start of collection, meaningful options remain. You may be able to request a Collection Due Process hearing to challenge the collection action and propose alternatives. An installment agreement can allow you to pay over time. Currently Not Collectible status may be available if you genuinely cannot pay anything right now. And if you qualify, an Offer in Compromise may allow you to settle the entire debt for less than the full amount owed. Our attorneys can evaluate all available options and recommend the most effective strategy for your situation.

Serving Taxpayers Throughout Southeastern Wisconsin

Bender Law is based in Watertown, Wisconsin, and serves individuals and small businesses across Jefferson County, Dodge County, and the surrounding region. We assist clients with IRS and Wisconsin DOR tax assessment matters throughout Watertown, Jefferson, Juneau, Whitewater, Lake Geneva, Elkhorn, Johnson Creek, Oconomowoc, Delavan, Janesville, and beyond. As a full-service general practice firm with decades of experience, we bring deep legal knowledge and genuine personal attention to every client we represent.

Facing a Tax Assessment? Talk to Bender Law Today.

Whether you have just received your first IRS notice or are already dealing with collection on a finalized assessment, it is never too early — or too late — to get the right legal advice. Contact Bender Law today to schedule a consultation with one of our tax attorneys.

(920) 261-7626  |  138 Hospital Dr., Suite 100, Watertown, WI 53098

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