IRS Audit Preparation Guide

Start with the type of audit, because that single fact tells you how much work is coming. Most any irs audit preparation guide skips this, but it’s the first thing we sort out at our New York desk. A correspondence audit arrives as a letter, often a CP2000 or a CP75, asking for backup on one or two line items like charitable gifts or the Earned Income Tax Credit. You answer it by mail or fax, and you never meet anyone in person. An office audit asks you to bring records to an IRS office and sit with an examiner for a couple of hours. A field audit is the heavy one. An IRS agent comes to your home, your business, or your representative’s office and reviews the whole return. The IRS lays out these three formats on its IRS audits page, and the letter you receive will name which one applies to you. Read that letter slowly, because it also states the tax years under review and the exact items in question.

Here is why the distinction matters in dollars. A correspondence audit over a $4,000 charitable deduction is a paperwork exercise. You send the acknowledgment letters and canceled checks, and it closes. A field audit on a Schedule C business pulling in $300,000 of gross receipts is a different animal. The agent can ask for bank statements, look at deposits that do not tie to reported income, and walk through your home office. We had a Brooklyn contractor client whose field audit started over vehicle expenses and expanded to three years once the agent saw mileage logs filled in with the same pen on the same day. That is the risk of a field audit. The scope can grow, and what looked like a $1,200 question turned into a review of every year still open under the statute.

The mechanics of the timeline are set by statute. Under Internal Revenue Code section 6501, the IRS generally has three years from the filing date to assess additional tax. If you understated gross income by more than 25 percent, section 6501(e) stretches that to six years. There is no time limit at all on a return the IRS deems fraudulent or one you never filed. So when an examiner asks to extend the statute on a Form 872, that request is loaded. You do not have to sign it, but if you refuse, the agent will assess based on what is in front of them, which is rarely in your favor. We weigh that tradeoff case by case, because sometimes the extra time helps you more than the IRS.

Knowing the type also tells you where the audit happens and who runs it. Correspondence audits are handled by a campus unit, so you may deal with a different person each time you call, which is why a written paper trail beats phone calls. Office and field audits are assigned to a single revenue agent who owns the case start to finish, and building a businesslike rapport with that one person genuinely helps. For a business field audit, the agent may also run a bank deposit analysis, adding up every deposit across your accounts and treating anything you cannot explain as unreported income. That is why we reconcile transfers, loan proceeds, and gifts in advance, since a $20,000 transfer between your own two accounts looks like income until you prove it was not. Sorting the format first lets us plan the whole defense.

We see one mistake every single year. A taxpayer gets a correspondence letter, panics, and calls the IRS to argue over the phone. The IRS will not open an audit by phone, and the person you reach cannot resolve a documentary issue verbally. Read the letter, note the response date, and answer in writing with copies, never originals. Keep proof of mailing so you can show the response arrived on time. One edge case worth flagging. If you moved and the audit letter went to your old address, the deadlines still run. Update your address on Form 8822 so notices reach you. If your return was prepared here, send us the notice the day it arrives. Our IRS audit and notice assistance team triages the letter type first so we answer the right way, and you can reach us through our new client inquiry form.

Selection is mostly math, not suspicion, and that reframing calms a lot of people down. The IRS runs your return through a scoring system. The model compares each return against statistical norms built from the National Research Program, a sample of returns the agency examines in depth to learn what a normal return looks like. When your numbers fall far outside those norms, the score climbs and a human reviews the return to decide whether to open an exam. The IRS explains on its audits page that selection does not always mean something is wrong, and that random selection alone can pull a perfectly clean return. So treat selection as a probability question, not a verdict, and do not assume the IRS has caught you doing something. Often it has caught nothing at all and just wants to see the support.

Certain items raise the score more than others. Large Schedule C losses year after year, because the IRS wonders whether you are running a business or a hobby under section 183. Round numbers everywhere, because real expenses are rarely $5,000 even. A home office deduction that swallows most of the home. Large cash transactions and businesses that handle cash, like restaurants and salons, which historically underreport. Vehicle expenses claiming 100 percent business use on the only car you own. And mismatches. The IRS receives a copy of every W-2, 1099-NEC, 1099-K, and K-1 sent to you. When your reported income does not match those documents, the computer flags it automatically and a CP2000 follows. That is not really an audit, it is a document-matching notice, but it feels like one and it carries the same penalty exposure.

Let me give you real numbers. Say you report $90,000 of wages and the IRS has 1099-K data showing $28,000 in card payments to a side business you forgot to put on Schedule C. The system catches the $28,000 gap, and now you owe income tax on it plus self employment tax at 15.3 percent, roughly $4,284 before income tax, plus a 20 percent accuracy penalty under section 6662 if the understatement is substantial. That one omission can cost five figures once interest stacks on top. Amended returns get screened too, so filing a 1040-X does not clear the original from review, and a refund by itself is not a trigger despite the myth that asking for money back invites a look.

There are a few quieter triggers worth naming. Cryptocurrency activity now sits on the front page of Form 1040 with a yes or no question, and the IRS receives exchange reporting, so an unchecked box against known activity invites a look. Foreign accounts that should have been reported on an FBAR or Form 8938 carry steep penalties and draw attention on their own. Crypto, foreign accounts, and large unreimbursed losses all sit higher on the scale than people expect. Partnership and S corporation K-1s that do not match what the entity filed get flagged the same way a W-2 mismatch does. And consistency over time matters, since a business that reports a loss in five straight years invites the hobby loss question under section 183 even if every loss was real.

The mistake we see constantly is people assuming a high income alone draws audits. Audit rates do climb at the top, but the bigger driver for most filers is the mismatch and the outlier deduction. One edge case. Claiming the Earned Income Tax Credit raises scrutiny because the error rate on that credit is high, so EITC returns get examined at a rate above their share of filings, often by correspondence asking you to prove a qualifying child lived with you. Keep school records and medical records that show the address, because the IRS wants third party proof, not your word. If you want a second set of eyes before you file so the return does not light up the model, our individual tax return preparation builds the support in as we go, and new clients start at our new client inquiry page.

Organize by the line item the examiner is questioning, not by year or by shoebox, and you will cut the audit’s length in half. When the IRS opens an exam it sends a written request, often an Information Document Request, listing exactly what it wants. The agency keeps a public audit records request listing of the categories it commonly asks for, and reading that early tells you what to pull. Build one folder per issue. If the audit questions $18,000 of travel and $9,000 of meals, you want a travel folder and a meals folder, each holding the receipts, the credit card statements, the calendar entries, and a one-page summary that ties the total to the dollar figure on the return. That summary page is what an examiner reads first, and a clean one signals you have your house in order.

The standard of proof matters here. You generally need to substantiate a deduction with a contemporaneous record, meaning something created at the time, not reconstructed the night before the meeting. For travel, meals, and vehicle expenses, section 274(d) imposes strict rules. A bank statement showing a charge at a restaurant is not enough by itself. The examiner wants the business purpose and who was there. For a vehicle, a mileage log kept through the year beats an estimate every time. The law also requires you to keep the records behind a return for at least three years from filing, which is why we tell clients to scan everything and hold it for seven to be safe given the six year statute on large understatements. Digital copies are fine, and the IRS accepts many electronic records, so a tidy folder on your drive does the job.

Here is a worked example. A client deducted $12,400 in subcontractor payments. The examiner asked for proof. We produced canceled checks, the signed contracts, and the Forms 1099-NEC filed for each subcontractor. Total tied to the penny, and that line closed with no change. Compare that to a client who deducted $7,500 of supplies with nothing but a credit card summary. The examiner disallowed $3,100 of it because the statement did not show what was bought, and the rest survived only because we found vendor invoices in an email archive. Documentation is the whole game, and the client with the contracts spent twenty minutes in the exam while the client with the bare statement spent three weeks chasing paper.

Format the package the way the examiner works. Lead each folder with a cover summary, then the source documents in date order, then a reconciliation that proves the folder total equals the line on the return. Number the pages so you can reference them in a letter, page 14 of the travel folder, rather than describing them. If the request covers more than one year, keep the years separate, because mixing them is how a $3,000 deduction in one year gets compared against a different year and creates confusion you then have to untangle. We also keep a running log of what was sent, on what date, and how, so if the IRS later claims it never received something, we hand over the proof of delivery and the matter ends there.

The mistake we see every year is people handing over a giant box of unsorted paper, thinking volume signals cooperation. It does the opposite. It invites the agent to wander, and a wandering agent finds new issues. Give the examiner exactly what was requested, organized and summarized, and nothing more. One edge case. If a record is genuinely lost, you can sometimes reconstruct it from third party sources, a bank reprint or a vendor statement, and under the Cohan rule a court may allow a reasonable estimate for some expenses, though never for the section 274(d) categories. That gap is exactly where a good irs audit preparation guide earns its keep. If you would rather not assemble this alone, our audit and notice assistance service builds the response package, and you can start at our new client inquiry form.

You have real rights in an audit, and knowing them changes how the exam goes. The IRS publishes them in two places worth reading. The Taxpayer Bill of Rights sets out ten fundamental protections, and Publication 1 explains them in the audit context. The ones that matter most during an exam are the right to be informed about why the IRS wants information, the right to pay no more than the correct amount of tax, the right to challenge the agency’s position and be heard, the right to appeal, the right to privacy, and the right to retain representation. That last one is the lever most taxpayers forget they can pull, and it is the single most useful tool in the whole process.

On representation, you do not have to attend the audit yourself. If you sign a Form 2848, Power of Attorney, a CPA, enrolled agent, or attorney can stand in your place and the examiner deals with us, not you. That is usually the right call. We answer the questions asked, we do not volunteer, and we do not get nervous and ramble, which is how taxpayers accidentally open new issues. Whether to bring representation depends on stakes and type. A simple correspondence audit over a $2,000 deduction often does not need a professional. A field audit on a business, or anything involving unreported income or potential penalties, almost always does. The math is simple. If the tax at issue exceeds what representation costs, get represented, and if a criminal question is even hinted at, get an attorney without delay.

Here is how this plays out. A client faced a field audit with $40,000 of business deductions in question. Going in alone, the exposure with the 20 percent accuracy penalty under section 6662 and interest could have topped $13,000. We represented under a 2848, narrowed the exam to two issues, substantiated most of it, and the change came down to roughly $2,800. We do not promise that result for anyone, because every file is different and the records drive the outcome, but representation kept the conversation disciplined and the scope from spreading into years that were not originally on the table. The same client tried to call the agent directly twice before hiring us, and each call added a question to the file, which is the clearest argument we can make for letting a representative do the talking from the very start of any exam.

Two rights deserve extra attention during the exam itself. The right to record applies, since you may make an audio recording of an in person interview if you give the IRS ten days written notice, and the agency may record too. The right to privacy means the examination should be no more intrusive than necessary, so an agent cannot demand records that have nothing to do with the issues named in the notice. If an examiner strays into a year that is closed under the statute or an item never raised, we say so on the record and ask them to put the request in writing. Pushing back politely on scope is not obstruction, it is simply holding the IRS to the boundaries of its own notice, and it often keeps a narrow audit narrow.

The mistake we see every year is the taxpayer who chats freely with the examiner to seem cooperative and mentions a side income source or a second property that was not on the radar. The agent now has a new thread to pull. Be polite, answer what is asked, and stop. One edge case worth knowing. If the IRS ever proposes something that smells like fraud, or an agent from Criminal Investigation appears, you stop talking and get a tax attorney immediately, because the protections shift from civil to criminal and anything you say can be used against you. For ordinary civil exams, our audit representation team can hold the Power of Attorney and run the exam for you, and ongoing tax compliance work keeps your records audit-ready year round. New clients begin at our new client inquiry page.

Every audit ends one of three ways, and you have a clear path if you disagree, so do not treat the examiner’s first number as final. The IRS closes an exam as no change, agreed, or disagreed. No change means you substantiated everything. Agreed means the IRS proposed adjustments and you accept them, at which point you sign the examination report and arrange payment if you owe. Disagreed means you understand the proposed changes and reject them. Publication 556 walks through this whole process, and any honest irs audit preparation guide will tell you the disagreed path has real teeth. The examiner’s report is a proposal, not a final bill, and you have formal ways to push back before the number sticks.

If you disagree, the first stop is the examiner’s manager. A short conference can resolve a misunderstanding without anything formal. If that fails, the IRS sends a 30-day letter with an examination report. You then have 30 days to request a hearing with the IRS Independent Office of Appeals, a separate function whose job is to settle cases without litigation by weighing the hazards of going to court. For a smaller case you write a brief protest letter. For amounts over $25,000 you file a formal written protest laying out each disputed item, the facts, and the law. If you let the 30 days lapse, the IRS issues a 90-day letter, the statutory notice of deficiency under section 6212, and your only remaining move without paying first is a petition to the United States Tax Court within 90 days. Miss that, and you must pay the tax and sue for refund in district court, which is slower and more expensive.

A worked example shows why Appeals is worth using. A client got a 30-day letter proposing $16,000 of additional tax on disallowed business expenses. We filed a protest, and at Appeals the officer weighed the litigation risk, accepted the records we had reorganized, and settled the liability at about $4,500. We cannot guarantee any particular reduction, because Appeals weighs the specific facts and the strength of your documentation, but the forum exists precisely to give reasonable cases a fair second look away from the examiner who first proposed the change. Appeals officers are not graded on how much tax they collect, which is why the conversation there is often more reasonable than the one with the examiner. We came in with a tabbed binder, a one page legal summary, and the canceled checks the examiner had waved off, and the officer worked through it line by line rather than defending the original report.

A few practical points shape the appeal. If you owe and want to stop interest from running while you fight, you can make a deposit under section 6603 without conceding the issue, which freezes the interest clock on the disputed amount. If the audit produced penalties, Appeals can abate them where you show reasonable cause, such as reliance on a professional or a genuine misunderstanding of a hard rule. And mediation, the IRS fast track and post Appeals programs, can resolve a stubborn factual dispute faster than a formal protest. We pick the route based on the dollars and the nature of the disagreement, because a factual fight over receipts is handled differently than a legal fight over how a statute applies.

The mistake we see every year is people who blow the 30 days because they were waiting to gather more documents. The clock does not pause for that. Calendar the deadline the day the letter arrives and file the protest on time even if you supplement records later. One edge case. You can extend the assessment statute on a Form 872 to buy time for Appeals, which sometimes helps, but never sign one without understanding what window you are opening. If a notice has you stuck, our audit and notice assistance team handles the protest and the Appeals conference, and steady tax compliance reduces the odds you land here again. Start with us at the new client inquiry form.