IRS Audit & Tax Controversy
From a CP2000 notice to a Tax Court petition, Silicon Valley Tax handles every stage of the IRS controversy process. Led by Al Nuñez, CPA and JD, with 20+ years of examination representation, Appeals work, and complex controversy at the Managing Director and Partner level.
Complimentary 30-minute consultation. Al evaluates your notice or examination and tells you honestly what the exposure is and what can actually be done about it.
Highly rated on GoogleA CP2000 from the IRS is a tax bill in formal-letter form, not a request for information. An examination notice is an adversarial proceeding, not a paperwork exercise. What you say in your first response sets the boundaries of everything that follows.
Silicon Valley Tax handles IRS controversy and audit defense as a dedicated practice led by Alfonso Nuñez, CPA and JD. Al spent 20+ years doing this work at the Managing Director and Partner level at Andersen Tax and RSM US LLP, handling everything from correspondence audits to Tax Court matters. He brings that experience directly to SVT clients, including the Bay Area tech employees, startup founders, and high-net-worth individuals who make up most of the clients who come to us with notices.
If you received an IRS notice and are not sure what it means, or if you already know what it means and want someone with litigation-level credentials defending you through the process, this is where to start. Below is a plain-language breakdown of every stage of the IRS controversy process and what SVT does at each one.
The CP2000 is issued by the IRS Automated Underreporter (AUR) program when income reported on third-party documents does not match your return. For Bay Area tech employees, this almost always involves RSU vesting proceeds, ESPP sales, or ISO exercises where the broker reported full sale proceeds on a 1099-B without including the compensation element already taxed at ordinary income rates as cost basis. The result is a proposed assessment on income you already paid tax on at vesting. A CP2000 is a proposed adjustment, not a final bill. You have the right to agree, disagree, or partially disagree, and you have 60 days from the notice date to respond. An unanswered CP2000 converts to an assessment automatically.
IRS Examinations
An IRS examination is an adversarial proceeding. The revenue agent or examiner is not your advisor. Their job is to identify and assess additional tax, interest, and penalties. What you say, produce, and concede in the early stages shapes the scope of everything that follows. Broad document productions, volunteering information outside the scope of the notice, and responding without professional representation are how taxpayers turn a small exam into a large one.
The most common form. Conducted entirely by mail with a specific IRS campus. The IRS requests documentation for one or more items on your return. Scope is narrow but escalates quickly if responses are incomplete or inconsistent. SVT manages the correspondence, drafts substantiated responses, and ensures nothing outside the stated scope is volunteered.
Conducted at an IRS Service Center with a tax compliance officer. You or your representative presents documentation in person. Office audits often involve business expenses, home office deductions, and Schedule C income. SVT prepares a complete document package in advance so the meeting is controlled and the scope stays defined.
A revenue agent conducts the exam at your place of business. Field audits are reserved for more complex returns and carry the highest risk of expansion. SVT builds an examination notebook, trains your staff on what to say and not say during the site visit, and manages all direct contact with the revenue agent on your behalf. Your revenue agent speaks to us, not to you.
ISO exercise spread is a preference item for AMT purposes under IRC §56(b)(3). High-value option exercises generate AMT exposure that many taxpayers and preparers underestimate. When the IRS challenges AMT calculations on large ISO exercises, Al's background in equity compensation tax positions SVT to build the technical defense from statute and regulations, not just from the return itself.
R&D credit claims and §174 R&E capitalization positions are on the IRS examination radar, particularly for companies with large credits relative to revenues. The documentation requirements are specific and the IRS looks for contemporaneous records tied to qualified activities and employees. SVT builds and defends these positions using the same substantiation framework we use to prepare the original credit study.
FinCEN FBAR examinations and IRS foreign account issues carry penalty exposure that dwarfs most domestic tax adjustments. Non-willful FBAR penalties can reach $10,000 per account per year; willful penalties reach the greater of $100,000 or 50% of account value per year. SVT works with outside counsel when criminal exposure is a factor, and handles the civil controversy representation directly for non-willful matters.
When an examination closes with an IRS determination you disagree with, you receive a 30-day letter offering the opportunity to request consideration by the IRS Independent Office of Appeals. Appeals is a separate function from the examination division. Appeals officers are instructed to resolve cases based on the hazards of litigation, meaning they consider what would happen if the case went to Tax Court. A well-framed written protest documenting the legal and factual basis for your position is the entry point. SVT drafts the protest, prepares the legal memorandum, and represents you in the Appeals conference. Many cases that look bad out of examination settle at Appeals on acceptable terms.
If Appeals does not resolve the dispute, or if you choose to bypass Appeals, the next stop is the United States Tax Court. The 90-day letter (Statutory Notice of Deficiency) is the IRS's formal notice that it intends to assess tax. From the date on that letter, you have 90 days to file a petition with the Tax Court. Miss the deadline and you lose jurisdiction. Tax Court is where the JD matters most. SVT evaluates the merits of the case, advises on the risk-adjusted value of petitioning versus paying, and coordinates with outside counsel when trial representation is required. For disputes under $50,000 per tax year, the Small Tax Case (S-Case) procedure offers a simplified, less expensive path.
When the IRS has assessed a tax liability and moved to collect, the two collection tools available to them are federal tax liens (which encumber your property) and levies (which seize wages, bank accounts, or other assets). A Collection Due Process hearing gives you the right to challenge the appropriateness of the collection action, propose an alternative (installment agreement, Currently Not Collectible status, or Offer in Compromise), and dispute the underlying liability in some circumstances. The CDP request must be filed within 30 days of the levy notice or lien filing. An equivalent hearing is available for up to one year but does not preserve Tax Court jurisdiction. SVT files timely CDP requests, prepares the financial disclosure package, and negotiates the collection alternative that fits your situation.
Additional Controversy Services
When a joint return contains an understatement that results in a tax liability, both spouses are jointly and severally liable for the full amount, regardless of who earned the income or who prepared the return. IRC §6015 provides three paths to relief for a spouse who did not know about, and had no reason to know about, the erroneous item.
IRS penalties for late filing, late payment, and accuracy-related issues can equal 20 to 25 percent of the tax due, plus interest that continues to accrue. They are not automatic and final. First-Time Abatement (FTA) is available to taxpayers with a clean compliance history without requiring any showing of cause. Reasonable cause abatement requires a well-documented factual narrative.
Coming forward proactively to correct unreported foreign accounts or domestic income almost always produces better outcomes than waiting to be found. The IRS offers formal disclosure pathways that cap civil penalties and, for non-willful conduct, eliminate criminal referral risk. The right program depends on the facts, the duration, the amounts, and whether the conduct was willful.
California's Franchise Tax Board operates independently from the IRS and runs its own examination and protest process. An IRS audit that changes your federal liability typically triggers an automatic state conformity notice. Stock option exercises, ESPP transactions, and trust residency issues are common triggers for FTB examination, often arising from a federal change that the FTB picks up automatically.
Who Leads This Practice
Alfonso Nuñez
Managing Partner, Silicon Valley Tax
CPA. JD, William S. Boyd School of Law, University of Nevada, Las Vegas. 20+ years of corporate tax, IRS controversy, and complex advisory work at Andersen Tax (Managing Director) and RSM US LLP (Partner).
"An IRS examination is not a paperwork exercise. It is an adversarial proceeding. What you produce, what you say, and what you concede in the early stages sets the scope of everything that follows. The JD matters most when the IRS disagrees, because at that point you are not just doing tax, you are doing law."
Al Nuñez is the Managing Partner of Silicon Valley Tax and the practice lead for all IRS controversy and audit defense engagements. He holds a CPA license and a JD from the William S. Boyd School of Law at the University of Nevada, Las Vegas. That combination is uncommon at the practitioner level. Most CPAs do not have the litigation background to build a legal argument for Appeals. Most tax attorneys do not have the accounting depth to reconstruct basis schedules, model penalty exposure, or understand how a return was assembled. Al has both.
Al spent more than 20 years doing controversy and consulting work at the Managing Director and Partner level, first at Andersen Tax's San Francisco office and then as a Partner at RSM US LLP. Andersen Tax is built almost entirely around complex tax consulting and controversy, which means the work is transactional and adversarial by design. RSM, the fifth-largest accounting firm in the country, added significant scale in complex clients: multi-entity structures, cross-border transactions, R&D credit positions under examination, and contested IRS matters with real dollar exposure. That is the work Al did for 20+ years before joining Silicon Valley Tax.
For SVT clients, that experience translates directly. When Al evaluates a CP2000, he is reading it against the basis records, the W-2, and the brokerage statements simultaneously, not just checking whether a number matches. When he writes a protest for Appeals, he is structuring a legal argument around the hazards of litigation, not just restating the facts. When a client receives a 90-day letter, Al's assessment of whether to petition Tax Court is grounded in real litigation experience on both sides of similar issues.
Controversy work is also where Al's background in equity compensation, R&D credits, and international tax positions SVT to handle the complex notices that Bay Area tech employees, startup founders, and HNW individuals are most likely to receive. RSU basis disputes, ISO exercise challenges, R&D credit examinations, and FBAR matters are not the kind of cases a general-practice CPA is positioned to defend well. They are exactly the kind of cases Al has spent his career handling.
Frequently Asked Questions
Do not ignore it and do not respond without reviewing the proposed changes against your original return and source documents. A CP2000 is a proposed adjustment, not a final bill. You have the right to agree, disagree, or partially disagree. The response deadline is generally 60 days from the notice date. An unanswered CP2000 converts to an assessment automatically. Silicon Valley Tax reviews the underlying basis discrepancy, prepares a substantiated response, and handles all IRS Automated Underreporter correspondence on your behalf.
Correspondence audits typically resolve in 3 to 6 months if you respond completely and promptly. Office audits run 3 to 12 months depending on the issues. Field audits with a revenue agent can run 12 to 36 months for complex returns. Appeals adds another 12 to 24 months on average. The statute of limitations on assessment is generally 3 years from the filing date, extended to 6 years if income is understated by more than 25 percent, and unlimited for fraud or non-filing.
Yes. Al Nuñez holds both a CPA license and a JD, which qualifies him to practice before the IRS at all levels including the IRS Independent Office of Appeals. Representation at Appeals is distinct from examination representation and requires building a written protest that frames the issues around law and hazards of litigation. Al has handled Appeals conferences on unreported income, basis disputes, R&D credit positions, and penalty challenges. Many cases that close out of examination with a significant proposed deficiency settle at Appeals on acceptable terms.
They are the same thing. The IRS uses the word "examination" in official communications because it sounds less adversarial. The result if unresolved is the same: an assessment of additional tax, interest, and penalties. The format varies: correspondence audits are conducted by mail; office audits are held at an IRS Service Center; field audits involve a revenue agent visiting your business or meeting with your representative.
A 90-day letter is a Statutory Notice of Deficiency. It is the IRS's formal notice that it intends to assess additional tax. You have 90 days from the date on the letter (150 days if you are outside the United States) to file a petition with the United States Tax Court. If you miss the deadline, the IRS assesses the tax and your only remaining path is to pay the liability and then sue for refund in federal district court or the Court of Federal Claims. The 90-day deadline is a hard jurisdictional cutoff and cannot be extended.
Yes. The two most common paths are First-Time Abatement and reasonable cause. First-Time Abatement is available to taxpayers with a clean compliance history in the prior three years for failure-to-file, failure-to-pay, and failure-to-deposit penalties. It does not require any showing of hardship or cause and can be requested by phone or in writing. Reasonable cause requires a documented narrative that the taxpayer exercised ordinary business care but was still unable to comply. SVT prepares abatement requests in writing and follows up through the IRS Penalty Appeals Program if the initial request is denied.
Often yes, and for two reasons. First, your current CPA may have a conflict of interest if the IRS is challenging a position they took on the return. Second, controversy representation requires a different skill set than return preparation. A CPA who is excellent at compliance may not have experience managing examinations, writing Appeals protests, or evaluating whether to petition Tax Court. SVT can take the controversy engagement and coordinate with your existing preparer for factual questions about the return without displacing them for future compliance work.
Related Services
Business Tax Consulting
The full scope of Al's practice: transaction structuring, R&D credit studies, and audit defense under one roof.
R&D Tax Credit
We build and defend R&D credit positions using the same documentation framework the IRS expects to see in an examination.
International Tax
Streamlined filing procedures, FBAR penalty mitigation, and voluntary disclosure for non-willful foreign account issues.
ASC 740
Uncertain tax position analysis, ASC 740-10-25-6 documentation, and tax provision support for privately held companies.
Silicon Valley Tax is a tax and accounting firm with CPAs on staff, led by Managing Partners Cooper Hathaway and Alfonso Nuñez. Al brings 20+ years of IRS controversy experience, a CPA license, and a JD to every engagement. The complimentary consultation is 30 minutes with Al personally. He reviews your notice or examination and tells you honestly what the exposure is, what the realistic options are, and whether SVT is the right firm to handle it.
Scoped engagement, fixed fee or hourly with a capped budget. No open-ended retainers for defined-scope controversy work.
Get a complimentary 30-minute consultation with Al Nuñez, CPA and JD. He will review your IRS notice or examination and give you an honest read on your options. No obligation.
Schedule NowOr call us directly: (408) 383-9870