Tax Advice: What Actually Counts, and When It Protects You

For learning, yes. For deciding, no, and the distinction is not about whether the information is correct. A great deal of free tax advice on forums, in videos, and from chatbots is technically accurate as a general statement of law. The problem is that a general statement of law is not what protects you when the IRS adjusts your return. What protects you is advice built on your specific facts, and no source that has never seen your documents can produce that.

The regulation is explicit about this. Treasury Regulation 1.6664-4 permits reliance on professional advice as reasonable cause under IRC section 6664(c), but it defines advice as a communication that reflects the adviser’s analysis or conclusion, and it requires that the advice be based on all pertinent facts and circumstances and the law as it relates to those facts. A post written for a general audience by definition does not consider your pertinent facts. It doesn’t know that you’re a New York City resident, that the property was inherited rather than purchased, that you already claimed a related deduction in a prior year, or that your entity elected S corporation status in March.

Free tax advice also lacks the three things that make professional advice defensible: a named person with verifiable credentials, a documented record of what facts were supplied and when, and accountability. If a CPA gives you a position that turns out to be wrong, they have a license, professional liability coverage, an obligation under Circular 230, and a firm with an interest in resolving it. If an anonymous account is wrong, you own the entire outcome.

Here’s the arithmetic on why that matters. Suppose you sell a rental property in Brooklyn and a well-upvoted forum answer tells you the gain is fully sheltered by the section 121 exclusion because you lived there years ago. You report no gain. The IRS examines and determines that depreciation recapture of $86,000 was taxable at 25% and that a portion of your gain was allocable to nonqualified use, producing an additional $61,000 of taxable gain. Your additional tax comes to roughly $36,000. Because that understatement exceeds both $5,000 and 10% of the tax required to be shown, IRC section 6662 adds a 20% accuracy-related penalty of about $7,200, and interest runs from the original due date. You attempt a reasonable cause defense. You have no engagement letter, no memo, no adviser, and no record of what facts you supplied to anyone. The IRS explains the standard it applies at its reasonable cause page, and “a forum said so” is not on the list. The $7,200 penalty alone would have paid for a real opinion several times over.

Now the honest counterpoint, because a blanket “never trust the internet” line is not useful. Free sources are genuinely good at three things. They tell you a question exists. Most people don’t know depreciation recapture is a separate concept until they read about it somewhere. They give you vocabulary, so you can ask your CPA a precise question instead of a vague one. And they point at primary sources: an IRS publication, a form’s instructions, a code section. Reading the Form 1040 materials or a topic page on irs.gov before a meeting makes you a better client and makes the meeting shorter and cheaper. Use free sources to generate questions. Do not use them to generate conclusions.

There is one narrow exception worth naming. Official material published by the taxing authority itself, an IRS publication, a form’s instructions, a topic page, a revenue procedure, is free, and while it is not advice about your facts, it is at least authority. A taxpayer who follows the plain instructions to a form is in a far better position than one who followed a stranger’s summary of those instructions, because the instructions are the government’s own statement of its position.

Artificial intelligence answers deserve their own paragraph because they are now the most common form of free tax advice. They are fluent, they cite code sections, and they are often right in outline. They are also frequently wrong about current-year thresholds, about which rules changed in a recent act, and about state-specific treatment, and they present all of it in the same confident register. Worse, they will not tell you what they don’t know about your situation, because you didn’t tell them and they didn’t ask. Nothing in the reasonable cause regulations contemplates reliance on software output as a defense. An automated answer is a research starting point, not an opinion.

The common mistake: asking a question that is subtly different from your actual situation and then relying on the answer to the question you asked. People post “can I deduct my home office?” when the real question is “can I deduct a home office in a residence I rent, used partly for an S corporation I own, in a year I also had W-2 employment?” The generic answer to the generic question is right and useless. The second common mistake is treating unanimity as authority. Twelve people agreeing on a message board is not substantial authority. That term has a technical meaning tied to statutes, regulations, rulings, and case law, and a forum consensus is not on the list. The IRS describes the penalty that substantial authority defends against on its accuracy-related penalty page, and the standard is measured against published authority rather than popular agreement.

There’s also a middle path worth naming. Not every question needs a formal opinion. A short paid consultation, where a CPA reviews your actual documents and gives you a written answer, is often a few hundred dollars and covers the great majority of individual questions. The expensive engagements are reserved for genuinely uncertain positions. Many people avoid the small fee and then pay the large penalty, which is a bad trade on every dimension.

Going forward, use a simple filter. If getting it wrong costs less than the fee, decide it yourself with free sources and move on. If getting it wrong costs more than the fee, and equity compensation, property sales, entity elections, foreign accounts, and anything involving a trust always do, get the advice in writing from someone whose name goes on it. Our tax strategy guides cover the areas where the gap between generic and specific is widest. This page is general information rather than advice about your circumstances, which is precisely the point being made here: talk to a licensed CPA about your own facts.

Yes, and it’s one of the most underrated reasons to pay for professional work, but the protection is conditional, and the conditions are where most people fall down. Understanding exactly what the shield covers, and what it doesn’t, changes how you should be documenting your relationship with your accountant.

Start with what’s at risk. IRC section 6662 imposes a 20% accuracy-related penalty on the portion of an underpayment attributable to negligence, disregard of rules, or a substantial understatement of income tax. For an individual, substantial means the understatement exceeds the greater of $5,000 or 10% of the tax required to be shown on the return. The rate jumps to 40% for gross valuation misstatements and for understatements attributable to undisclosed foreign financial assets. Separately, IRC section 6663 imposes a 75% civil fraud penalty, and no amount of professional advice protects a taxpayer who committed fraud.

The relief provision is IRC section 6664(c): no accuracy penalty applies to any portion of an underpayment for which the taxpayer had reasonable cause and acted in good faith. Regulation 1.6664-4(b) lists reliance on professional advice as a circumstance that can establish reasonable cause, and subsection (c) sets the three requirements the advice must satisfy: it must take into account all pertinent facts and circumstances and the law as it relates to those facts; it must not be based on unreasonable factual or legal assumptions, including assumptions about future events; and it must not unreasonably rely on representations, statements, findings, or agreements from you or anyone else that the adviser knew or had reason to know were incorrect.

Courts apply this through the three-prong test from Neonatology Associates, P.A. v. Commissioner, 115 T.C. 43 (2000), affirmed by the Third Circuit in 2002. The adviser must have been a competent professional with sufficient expertise. You must have provided necessary and accurate information. And you must have actually relied on the adviser’s judgment in good faith. Prong one is why relying on a promoter who earns a commission on the transaction almost never works. Prong two is why the client who conceals a side agreement loses. Prong three is why a taxpayer who never read the memo, or who shopped for the answer until someone gave the one they wanted, loses.

Work a real example. A business owner takes a $340,000 deduction for a transaction her CPA analyzed in a written memo that laid out the facts she provided, the authority relied on, the conclusion, and a candid statement that the IRS might disagree. The IRS disallows it on examination. The additional tax is $126,000. Section 6662 would add a 20% penalty of $25,200 plus interest. She produces the memo, the engagement letter, the document list she supplied, and the email confirming she gave her CPA the full agreement including the amendment. The examiner concedes the penalty under section 6664(c). She still owes the $126,000 and the interest, reliance never erases the tax, but she keeps $25,200 and, just as importantly, she has a documented good-faith record if the IRS considers escalating. Now change one fact: she never mentioned the side letter that changed the economics. The penalty stands, because prong two failed, and the memo becomes evidence against her rather than for her.

There’s a parallel track worth knowing about. Even without reliance, a position with substantial authority, roughly a 40% likelihood of being sustained, measured against statutes, regulations, rulings, and case law, avoids the substantial understatement penalty on its own. A position with a lower but reasonable basis, roughly 20%, avoids it only if disclosed on Form 8275 or Form 8275-R attached to the return. Disclosure feels like waving at an examiner, and clients resist it, but on a genuinely uncertain position it converts a 20% penalty exposure into an ordinary disagreement about the law.

The common mistake: assuming the protection is automatic because you used a CPA. It is not. It attaches to advice, and advice has to exist in a form somebody can read. Verbal guidance given on a phone call in March, never memorialized, is worth very little in an examination two years later, because the examiner will not accept your recollection of a conversation as evidence of what facts were considered. Ask for a short email summarizing the conclusion and the facts relied on. Any competent CPA will send it, and it costs nothing.

The second mistake is expecting reliance to cover the wrong penalty. The Supreme Court held in United States v. Boyle, 469 U.S. 241 (1985), that reliance on an agent to file a return on time is not reasonable cause for a late-filing penalty, because the duty to file by the deadline is non-delegable. Your accountant missing the deadline is a malpractice question, not a penalty defense, and the categories of relief the IRS will actually consider are listed on its penalty relief page. The IRS describes both the penalty and the relief standard at its accuracy-related penalty page.

Also worth knowing: your CPA has their own exposure, which is why a good one pushes back. IRC section 6694 penalizes a preparer whose understatement is due to a position lacking substantial authority, the greater of $1,000 or 50% of the income derived from preparing the return, indexed for inflation, and the penalty for willful or reckless conduct is the greater of $5,000 or 75%. When an accountant tells you a position is too aggressive, they are not being timid. They are being examined by the same statute you are.

One more limit: reliance protects the taxpayer who relied, not the position itself. If the IRS is right on the law, you still owe the tax and the interest. Clients sometimes hear “the penalty was abated” as “we won,” and it is not the same thing. The value of good advice is that it caps the damage at the correct number rather than the correct number plus twenty percent.

Going forward, build the habit now rather than during an audit. Ask for written advice on anything material, keep the engagement letter, keep the list of documents you provided, and answer your CPA’s questions completely even when the answer is inconvenient. Our guide to how Form 1040 works covers where the disputed items usually sit. This is general information and not tax or legal advice about your situation; consult a licensed CPA before relying on any position discussed here.

Circular 230 is Treasury Department Circular No. 230, codified at 31 C.F.R. Part 10, and it governs practice before the Internal Revenue Service. The IRS publishes the current text as a free PDF at irs.gov. It runs about fifty pages, it is written in plain enough English, and clients almost never read it, which is unfortunate, because it is essentially a list of things you are entitled to expect from anyone you pay for tax advice.

It applies to attorneys, certified public accountants, enrolled agents, enrolled actuaries, enrolled retirement plan agents, and appraisers who practice before the IRS. Enforcement runs through the Office of Professional Responsibility, which can censure, suspend, or disbar a practitioner from practice before the Service. That is a distinct proceeding from a state board of accountancy revoking a CPA license, and a practitioner can lose one without losing the other.

The sections worth knowing by number are short. Section 10.22 requires due diligence in preparing, approving, and filing returns and documents, and in the correctness of oral and written representations made to the Department of the Treasury and to clients. Section 10.21 requires a practitioner who knows a client has not complied with the law, or has made an error or omission, to advise the client promptly of the noncompliance and its consequences. Your CPA is obligated to tell you when they find a problem, not to quietly move on. Section 10.27 restricts contingent fees; a percentage-of-refund arrangement on an original return is outside the rules in most circumstances, though a federal court narrowed the IRS’s authority over ordinary refund claims in Ridgely v. Lew in 2014. Section 10.28 requires the practitioner to return your records promptly on request, and a fee dispute does not excuse withholding the records you need to comply with your own obligations. Section 10.29 governs conflicts of interest and requires informed written consent when one exists. Section 10.34 sets the standards for signing a return, prohibiting a practitioner from signing one containing a position lacking a reasonable basis or taken to delay or impede tax administration. Section 10.35 requires competence. Section 10.37 sets the written advice standard: base it on reasonable factual and legal assumptions, consider all relevant facts you know or reasonably should know, use reasonable efforts to identify the facts, don’t rely on unreasonable representations, and don’t take into account the likelihood that the return will be audited.

That last clause deserves emphasis. A practitioner is prohibited from advising you that a position is fine because the IRS probably won’t look. Audit lottery reasoning is not permitted advice, and an adviser who offers it is telling you something about themselves.

An illustration with numbers. A client asks whether a $180,000 payment to a related entity is deductible. An adviser operating under section 10.37 writes down the facts as provided, identifies the authority, states the conclusion, and notes that if the related-party arrangement lacks a business purpose the deduction fails and a 20% penalty under IRC section 6662 would apply to roughly $63,000 of additional tax, about $12,600. The client now knows the downside, in dollars, before filing. An adviser who instead says “everybody does this” has provided no analysis, has not satisfied 10.37, and has given the client nothing to rely on under Regulation 1.6664-4 when the examination arrives. Same fee, same conclusion, radically different value.

Circular 230 has a history that explains its current shape. Before 2014 it contained detailed “covered opinion” rules that produced the boilerplate disclaimer everyone remembers at the bottom of accountants’ emails. Those rules were removed and replaced with the single, more principles-based written advice standard in 10.37, which is why those disclaimers largely disappeared. If you’re still receiving emails with a lengthy Circular 230 legend, that firm is citing a rule that no longer exists.

For CPAs specifically, a second rulebook applies on top of Circular 230: the AICPA Statements on Standards for Tax Services, which were revised effective in 2024. They cover when a member may recommend a position, the level of inquiry required into a client’s information, the handling of errors on a prior return, and the standards for giving tax advice. They are enforceable through the AICPA’s professional ethics process and through state boards that adopt them. A CPA is therefore answerable to at least three bodies for the same piece of advice: the Office of Professional Responsibility, their state board, and the AICPA.

The common mistake: assuming Circular 230 covers whoever prepared your return. It covers practice before the IRS, and after the D.C. Circuit’s 2014 decision in Loving v. IRS the Service cannot license or regulate uncredentialed preparers as practitioners. An unenrolled preparer with only a PTIN is largely outside the disciplinary framework, which is exactly why the credential question matters. The IRS explains the practice-rights distinctions at its page on choosing a tax professional, and its PTIN requirements page explains the one thing every paid preparer must have.

The second common mistake is not invoking Circular 230 when it would help. If a former accountant is holding your records hostage over a billing dispute, section 10.28 is directly on point and citing it in writing usually ends the standoff. If you discover an error on a prior return, section 10.21 obliges your practitioner to advise you about it. If a preparer refuses to sign your return, that is a violation of the signature requirements and a reportable matter, and Form 14157 exists specifically for complaints against a preparer.

Looking ahead, the practical use of Circular 230 is as a checklist before you engage someone. Confirm the credential, ask whether advice will be written, ask how conflicts are handled if the firm also represents your business partner, and ask what happens to your records if you leave. A firm that answers all four cleanly is a firm that has read the rules governing it. A firm that has never heard of section 10.28 is telling you what will happen the day you ask for your files back. Our tax strategy guides cover the planning areas where written advice pays for itself fastest. This page is general information and not tax or legal advice for your situation.

Verify three things, in this order: the PTIN, the credential, and the disciplinary history. Each takes a few minutes and each is checkable against a public record rather than the person’s own website.

The PTIN comes first because it is the minimum. Anyone who prepares a federal return for compensation must have a Preparer Tax Identification Number issued by the IRS and must include it on every return they prepare, along with their signature. The requirement is explained on the IRS PTIN requirements page. A preparer without a PTIN is not merely unqualified. They are operating in violation of the law, and a preparer who fails to sign a return they were paid to prepare is subject to penalties under IRC section 6695.

The credential comes second, and it determines what the person can actually do for you when something goes wrong. Attorneys, certified public accountants, and enrolled agents hold unlimited representation rights before the IRS: they can represent any client on any matter before examination, collection, and appeals, whether or not they prepared the return. An enrolled agent earns the credential by passing a three-part IRS Special Enrollment Examination or through qualifying prior IRS employment, and is licensed federally. A CPA is licensed by a state board after an exam, an education requirement, and an experience requirement, and must complete continuing education to keep it. Everyone else has limited rights or none. An Annual Filing Season Program participant may represent a client only before examination staff, and only for returns they prepared and signed. A PTIN-only preparer cannot represent you at all. The IRS maintains a public searchable directory of preparers with credentials, described on its choosing a tax professional page.

Verification is the step people skip. A CPA license is confirmed through the licensing state’s board, in New York, through the State Education Department’s Office of the Professions, which publishes a free license verification search that also shows any disciplinary actions. An enrolled agent’s status can be confirmed with the IRS directly. New York adds its own layer: most paid preparers who prepare New York returns must register annually with the Department of Taxation and Finance, and commercial preparers face continuing education requirements and a registration fee. The state’s rules are published at the New York State Department of Taxation and Finance. A preparer working in New York without that registration is a fact you can discover before you hand over your documents rather than after.

Then ask the questions that credentials don’t answer. Who does the work and who reviews it, the person you met, or a seasonal contractor you’ll never speak to? Is examination representation included in the fee or billed separately, and at what rate? Does the firm carry professional liability insurance? Will advice come in writing? How many returns like yours does the firm handle in a season? What is the firm’s policy when it disagrees with a position the client wants to take? That last one is diagnostic. A firm that has never lost a client over a position it refused to sign is a firm that has never refused.

Here’s how the economics look when this goes wrong. A restaurant owner hires an unlicensed preparer who charges 15% of the refund generated. The preparer claims $94,000 of fabricated business expenses and generates a $31,000 refund, taking $4,650. Two years later the IRS examines. The tax is repaid, a 20% accuracy penalty under IRC section 6662 adds about $6,200, interest accrues from the original due date, and, because the preparer never signed the return. The owner has no reliance defense at all under Regulation 1.6664-4, since there is no identified professional whose advice she relied on. If the examiner concludes the overstatement was knowing, the 75% civil fraud penalty under IRC section 6663 comes into range, which on $31,000 of tax is $23,250 by itself. The preparer, meanwhile, has moved and stopped answering the phone. The contingent fee alone should have ended the engagement before it started, since it is restricted under Circular 230 section 10.27 and is a documented marker of return preparation fraud.

The common mistake: equating longevity or volume with competence. “He’s done my family’s returns for thirty years” tells you about the relationship, not about whether that person has kept current on equity compensation, foreign reporting, pass-through entity taxes, or the changes in the 2025 legislation. Tax law turned over substantially in the last few years, and a preparer coasting on 2015 knowledge will confidently give you 2015 answers. Ask what continuing education they completed last year and in what subjects. A credentialed professional will answer immediately.

The second common mistake is hiring for price on a complicated return. The fee difference between a competent firm and a cheap one is usually a few hundred to a couple thousand dollars. The difference in outcome on a return with a business, a property sale, equity compensation, or a trust is routinely ten times that in either direction. Cheap is the right choice for a simple W-2 return and a genuinely bad choice for anything else.

One credential question comes up constantly and deserves a direct answer: does it matter whether the person is a CPA rather than an enrolled agent? For representation rights, no. Both are unlimited. The practical differences are scope and depth. CPAs are trained across accounting, attest, and tax, and are the right choice when financial statements, entity structure, or business advisory work sit alongside the return. Enrolled agents are tax specialists and are frequently excellent at examination and collection work. The wrong question is which letters follow the name. The right question is how many situations like yours that person handled last year.

Going forward, do the verification before the engagement letter, not after the notice. Confirm the PTIN, confirm the license with the issuing board, confirm the New York registration if you’re filing here, read the engagement letter’s scope and its audit-representation clause, and get one substantive question answered in writing before you commit. Our guide on tax strategy covers the areas where the choice of adviser changes the number the most. This is general information rather than advice about your situation; a licensed CPA should review your specific facts.

Bad tax advice has a recognizable shape, and once you know the pattern you can spot it in the first conversation. Most of the markers below appear somewhere in the IRS Dirty Dozen list of abusive schemes, which the Service updates annually, and every one of them shows up in real enforcement cases.

The fee is a percentage of your refund or your savings. This is the single most reliable indicator. It aligns the adviser’s compensation with the size of the number rather than the accuracy of it, and it is restricted for original returns under Circular 230 section 10.27, which the IRS publishes at irs.gov. Firms that market a credit or a deduction and take 20% of the proceeds are selling a product, not giving advice, and a promoter’s opinion has repeatedly been held insufficient for reliance under the Neonatology test.

You get a number before they see your documents. A firm that quotes your refund or your credit amount on a first phone call has not performed any analysis. The employee retention credit wave produced thousands of these engagements, and the IRS responded with a moratorium on new claims, a withdrawal program, and a voluntary disclosure program for businesses that had already been paid. Many of those businesses are now repaying credits plus penalties and interest, and the promoter’s fee is gone.

They won’t sign the return. A paid preparer must sign and include a PTIN, as explained on the IRS PTIN page. A preparer who fills out your return and then tells you to file it as self-prepared is a ghost preparer, and the reason is that an unsigned return leaves no trail back to them when it’s examined. It also destroys your reliance defense, because there is no identified professional to have relied on.

The refund is directed to their account. There is no legitimate version of this. Your refund goes to your account.

The advice is a structure, not an analysis. Watch for pitches built around a form of entity or a trust rather than around your facts: a purported trust that “eliminates” income tax, a claim that filing is voluntary, a domestic entity arrangement that assigns your income to a shell you control, an inflated appraisal supporting a charitable deduction on land or art. Overvalued charitable contributions carry a 40% gross valuation misstatement penalty under IRC section 6662(h), not 20%, and syndicated conservation easements have been listed transactions with their own disclosure regime and their own litigation record.

They rely on the odds. An adviser who says the IRS is unlikely to check has just told you the position cannot be defended on the merits. Circular 230 section 10.37 specifically prohibits taking the likelihood of audit into account in written advice.

They discourage questions or documentation. Refusing to put a conclusion in writing, declining to identify the authority relied on, or telling you not to worry about the substantiation is a preview of how the engagement ends.

Run the numbers on a typical case. A consulting business with $600,000 of revenue is sold a package promising to “reclassify” $200,000 of income through a captive arrangement and a related management fee, for a $35,000 fee. The claimed federal savings is about $74,000. The IRS examines two years later, disallows the deduction for lack of business purpose, and assesses the tax plus a 20% accuracy penalty under section 6662 of roughly $14,800, plus interest running from the original due date. Reliance fails because the person who designed the structure also sold it, so prong one of the Neonatology test is not satisfied, and the requirements of Regulation 1.6664-4 are not met. Total cost: the $74,000 back, $14,800 of penalty, several years of interest, roughly $20,000 of professional fees to resolve the examination, and the original $35,000 that is not coming back. The strategy that was supposed to save $74,000 cost close to $145,000, and the only party who came out ahead was the firm that sold it. The IRS describes the relief standard the taxpayer failed at its reasonable cause page.

The common mistake: assuming that because a strategy is widely marketed it must be permitted. Marketing volume is not authority. The employee retention credit mills, the syndicated easement promoters, and the micro-captive marketers all operated at enormous scale and all ended up on IRS enforcement lists. If a strategy were as clean as advertised, it would not require a sales team.

The second common mistake is failing to act after realizing the advice was wrong. Amended returns exist. So do the withdrawal and disclosure programs the IRS opens for specific problem areas, and voluntary correction consistently produces better outcomes than waiting to be found. If you took a position on someone’s advice that now looks unsupportable, get a second opinion from an independent professional, not from the person who sold it to you, and price the cost of fixing it against the cost of an examination that includes penalties and interest.

A brief word on second opinions, because they are undervalued. Paying a second firm a few hundred dollars to review a proposed strategy before you implement it is the cheapest insurance in this field. An independent reviewer has no fee riding on the outcome and will tell you plainly whether the position has substantial authority, whether it merely has a reasonable basis and should be disclosed on Form 8275, or whether it has neither.

Going forward, apply one filter to every strategy anyone pitches you: ask them to write down the authority, the code section, the regulation, the ruling, or the case, and the specific facts of yours that make it apply. Legitimate advice survives that request easily. Bad advice does not survive it at all, which is why the request is almost never made and almost always decisive. Our guide to the ERC tax credit walks through what happened when an entire industry stopped asking that question. This page is general information, not tax or legal advice; consult a licensed CPA about your own facts before you act on or unwind any position.