Tax Audit: What It Is, Common Triggers & How to Prepare For It

A tax audit is a formal review of your financial records conducted by the IRS. It’s a process that sounds intimidating to many, as they associate it with inaccurate reporting and potential penalties. The reality is that the majority of audits are simply routine checks that are easily manageable with proper documentation.

In this article, we’ll explain more than the meaning of a tax audit to show you exactly how it works. We’ll go through some of the most common reasons why they happen and explore different types of audits. Following that, we’ll explain what the auditing process looks like before telling you how to prepare and what documents to present.

What Is a Tax Audit and How Does It Work?

A tax audit is a formal process conducted by the Internal Revenue Service (IRS), where it reviews your financial records and tax returns to verify their accuracy and compliance with tax laws. Broadly speaking, the IRS compares your reported income, deductions, and credits to ensure they match appropriate documents (e.g., Forms W-2 and 1099).

To do this, the IRS uses sophisticated software that automatically analyzes tax returns as they are filed. If the system spots any errors or inconsistencies, it flags the document and sends a formal notification to the filer in the mail. The IRS never initiates an audit via a phone call.

They come in various forms, ranging from simple inquiries that require minor clarifications to in-depth and in-person examinations of financial records and tax documents from the past several years.

Note that tax audits can happen to anyone. The IRS reviews the tax returns of individuals, freelancers, and independent contractors, but also small business owners and large multinational corporations.

Why Do Tax Audits Happen: 5 Triggers Explained

Tax audits can happen for many different reasons, some of which are not known to the public, since the IRS doesn’t disclose every detail about its algorithms. However, tax professionals have noticed several patterns that reveal some of the most common triggers, so let’s see what they are.

#1. Income Mismatches

Income mismatches happen when you don’t report all of your income accurately, and they are some of the fastest ways to trigger a tax audit. The IRS uses Automated Underreporter (AUR) to automatically compare the information you submitted with the documents in its database.

For instance, employers will send Form W-2, and clients Form 1099, to both you and the IRS. If there’s a discrepancy between the income you reported on your Form 1040 and the sum on these documents that the IRS already has, you’ll almost always get a notice to clarify the situation or pay the difference.

#2. High Deductions vs. Income

While you’re legally entitled to claim all kinds of tax deductions to reduce your liability, a disproportionate amount compared to your income will raise suspicions and potentially trigger an audit.

The IRS primarily uses statistics to establish typical deductions for your case. For instance, if you’re a small business owner, software compares the deductions you claimed to those of other business owners in your field.

If there are significant discrepancies, your tax return will stand out and be a cause for an audit. That’s why it’s critical to maintain meticulous documentation regarding your expenses to prove your claims when they differ from the statistical average.

#3. Self-Employment Red Flags

Self-employment professionals (e.g., freelancers, gig economy workers, small business owners) typically face much more scrutiny than W-2 employees. This is because they don’t have employers to withhold tax from their paychecks, so they are fully responsible for self-employment and other taxes.

This makes it much easier to underreport income or inflate business expenses. For instance, a business owner may attempt to claim 100% of the use of their vehicle as a business expense (even when using it for private purposes) or to claim several years of net business loss in a row.

Because of increased scrutiny, self-employed individuals need to be particularly careful when keeping records and filing taxes.

#4. Math Errors or Inconsistencies

Simple math errors or typing mistakes that result in inconsistencies are some of the main causes of IRS inquiries. If the numbers between the Forms you filed and the documents in the IRS database don’t match, the software will flag them regardless of the reason behind the mismatch.

Common mistakes that people make are interposing numbers (e.g., writing $4,500 instead of $5,400) or using rounded numbers. Tax returns with all numbers perfectly rounded (e.g., claiming $2,000 in home office expenses and $5,000 in advertising costs) will look suspicious, implying that you’re guessing the figures instead of using precise calculations.

#5. Random Selection

The process of random selection means that there is always a chance of being audited by the IRS, even if you did nothing wrong. A small percentage of tax returns are chosen at random for a few reasons, including to gather new data and to update the Discrimination Information Function (DIF) algorithm used to identify high-risk returns.

If your tax return is chosen, the algorithm will likely examine every point of data on it, and not a specific item. While this can feel frustrating, it’s a standard procedure that’s typically completed without much hassle.

What Are the Types of Tax Audits?

There are several types of IRS tax audits, depending on various factors, such as the complexity and severity of the issue and the amount of money involved. Three main types include the following:

• The mail audit is the most common type of tax audit, which is the least intrusive and often done the quickest. The IRS will usually send you a request via mail, asking for additional documentation to clarify an issue raised by its software. You respond to these audits via mail, as well. If you send the correct proof back, the audit is usually finished in no time.

• The office audit requires you to go to your local IRS office and submit the requested documents in person. This is a more detailed audit compared to the mail one. The IRS officer will likely interview you and review multiple documents and items on your return. They may ask you to bring various records, like bank statements, receipts, expense logs, and so on.

• The field audit is the most comprehensive type of tax audit, where an IRS agent visits you (at your home, office, or tax accountant’s office). These audits are typically reserved for the most complex cases with significant sums of money involved. Field audits usually cover multiple tax years, and agents analyze many documents in great detail.

How Does the Tax Audit Process Look?

It’s important to know how the tax audit process looks to better prepare for it and alleviate a huge amount of stress associated with it. Here’s a step-by-step guide:

• Audit notification. The process is initiated by the IRS once it sends you a formal notification via mail. This is primarily done with Form 4564 (Information Document Request), which will specify the tax year that’s under review and the documents that they need. Remember that the IRS will never contact you by phone, text message, or email.

• Document collection. The notification that you receive will specify which documents you need to gather (e.g., bank statements, receipts, payroll records) and how much time you have to do it. A typical tax audit due date is 30 days, and if you fail to respond within that time, the IRS may issue a legal summons or disallow your deductions.

• Document submission. Once you gather all the necessary records and organize them clearly, you need to submit them in the way the IRS requested. This most often involves sending the records via mail. You may also be required to deliver the documents in person to your local IRS office and answer follow-up questions during an interview.

• IRS review. The IRS will examine the documents that you sent (and the answers provided, if there was an interview), and compare them to the data they have. After this, they may conclude the review or ask for additional information if some of the discrepancies remain.

• Resolution or appeal. There are three typical outcomes to a tax audit, where you may have to make a choice. They are:
  • No change (your initial tax return is accepted).
  • You agree to the change and pay additional tax, if needed.
  • You disagree with the change and appeal.

Tax Audit Checklist: 10 Documents You Need

Preparing the correct audit documentation is critical to ensuring a smooth process. While the IRS will specify in its request the documents needed for a tax audit, it’s best to have the essential records ready at all times.

Core documents include:

• Tax returns. Auditors will usually request returns for the audited years.
• Income records. This encompasses various records, such as Forms W-2, Forms 1099 (NEC and MISC, but also K, INT, DIV, etc.).
• Bank and credit card statements. These documents show that your cash flow matches the income you reported.
• Receipts. Receipts are critical for deductions, acting as proof of costs of travel, meals, equipment, and more.
• Invoices. If you’re a contractor or a business owner, auditors may ask for invoices in addition to other proof of income.
• Pay stubs and payroll records. For employees and businesses, these documents are essential in validating income and expenses.

Additional documents (primarily for business owners and freelancers) that you can add to your IRS audit checklist include:

• Profit and loss statements.
• Mileage and travel logs.
• Contracts and agreements.
• Balance sheets.

How to Prepare for a Tax Audit: 3 Best Practices

It’s best to be prepared for a tax audit before you even receive a notification. Here are some of the best strategies to help you achieve that:

#1. Keep Your Documents Organized

Keeping your documents organized allows you to find everything that you need quickly and efficiently. Walking into an audit with a cardboard box full of disorganized records can make you appear negligent.

Instead, you want to organize your documents from the start, both chronologically and by category. Digitizing paper records makes the process much easier, as you can store and retrieve them effortlessly. You can create digital documents outright, using specialized software like generators at Paystub.org.

#2. Double-Check Reports

Before submitting your records to the IRS, you need to double-check reports (payroll records, expense reports, income statements) for accuracy and consistency. Make sure that all your records align (e.g., your profit and loss statement should match bank statements) and that there are no mistakes.

#3. Consult a Tax Professional

If you’re not sure how to navigate a tax audit, you should consult a tax professional, like a certified public accountant (CPA) or a tax advisor. These professionals have in-depth knowledge of the complex U.S. tax code and know the ways in which the IRS operates.

You can even use the Form 2848, Power of Attorney and Declaration of Representative, to allow a representative to communicate with the IRS on your behalf. They can interpret complex requests and statutes, help you prepare your documentation, and protect you in cases of unreasonable adjustments from the IRS.

Can You Avoid a Tax Audit?

Because of a random selection, you can’t avoid a tax audit with absolute certainty (even though less than 1% of individual income returns are audited). However, you can significantly reduce the chances of being audited by following good practices when filing your tax return.

One of the most important things is to always accurately report all income listed on your Forms W-2 and Forms 1099. Because the IRS uses sophisticated software to compare the numbers, you should avoid guessing or rounding figures and instead calculate everything down to the exact cent.

Following that, you should keep the Discriminant Information Function (DIF) score in mind. Know that the system analyzes your return in comparison with other businesses from your industry or individuals from your income bracket.

If some of your numbers are out of the ordinary (e.g., legitimate but unusually high deductions), you should always have proof to back them up. Moreover, you can proactively attach the records that explain the anomaly to the IRS before they even have the chance to request it from you.

What Happens If You Fail a Tax Audit?

What happens if you fail a tax audit depends on the severity of the issue. Technically speaking, you don’t “fail” an audit; the auditor instead determines that you’ve underreported taxes or overclaimed deductions.

If that happens, common outcomes include:

• Owing additional taxes.
• Having to pay interest on unpaid amounts.
• Having to pay penalties.

Depending on the case, you may have to pay back taxes, interest on the unpaid amount (typically calculated daily from the original due date of your tax return), and penalties all at once.

If the IRS determines that your acts were intentional and not just a careless mistake, you can be charged with a civil fraud penalty, which is 75% of the underpaid amount.

Keep in mind that you can agree or disagree with the tax audit report. If you believe that their findings are wrong, you can file an appeal. In these instances, consulting a tax professional can be essential in reducing your penalties or negating them altogether and protecting your rights.

Tax Audit Tips for Freelancers and Small Businesses

If you’re a freelancer or a small business owner, you’re generally at a higher risk of tax audits due to reporting complexities and pass-through income. Here are some tips to help you protect yourself and prepare in case of an audit:

• Never mix business and personal finances. Doing so makes it nearly impossible to separate the documents for an audit. You should have two separate accounts and credit cards and use them for intended purposes.

• Track every single expense. You need to have receipts and other documented proof for every expense that you want to claim as a deduction. Log everything as soon as you can to avoid trying to recreate the logbook from memory when filing your return.

• Maintain clear payroll records (if you have employees). Issue and store accurate pay stubs and keep payroll summaries to ensure regulatory compliance, reduce the risk of audits, and pass them with ease if they happen.

• Pay your estimated quarterly taxes on time. Set aside 25–30% of your income for quarterly taxes and always pay the right amount on time to keep your records clean and avoid unnecessary scrutiny.

Make Audit-Proof Records with Paystub.org

Accurate and organized records are essential in helping you pass audits effortlessly, and Paystub.org can help you create them with ease.

We offer the following intuitive and feature-packed software generators perfect for freelancers and small business owners, as well as individuals:

• Pay stub generator
• Form W-2 generator
• Form 1099 generator
• Invoice generator

Final Thoughts

Knowing how to prepare for a tax audit reduces a lot of stress associated with the process. And when you understand the triggers and red flags, you’ll know how to avoid them to minimize the chances of being subjected to a tax audit in the first place.

Remember that comprehensive and accurate documentation is your main tool in preventing audits and passing them with flying colors. Make sure to track your income and expenses and to log everything on time. Don’t forget to use Paystub.org generators if you need help with document creation and management.

Tax Audit FAQs

#1. How far back do tax audits go?

Tax audits typically go back up to three years for your returns. This can extend to six years if you substantially underreported your income (by 25% or more). There’s no time limit for a tax audit in case the IRS suspects tax fraud or if you’ve never filed a return.

#2. Can you go to jail for a tax audit?

While you can go to jail for a tax audit, that only happens in extreme circumstances, like intentional fraud or tax evasion. In most cases (e.g., due to standard errors, miscalculations, and negligence), you may, at most, face financial penalties and interest.

#3. What should you not say during a tax audit?

During a tax audit, you should not say the things that the auditor didn’t explicitly ask for. You should avoid guessing when you don’t know the correct answer, giving incomplete answers, or providing unnecessary information. Moreover, avoid arguing, being defensive, or making inappropriate jokes (especially those regarding tax evasion).