IRS Examination Prep: A Pre-Audit Checklist for SMBs and Their CPAs

Getting selected for an IRS examination is uncommon, but when it happens, the difference between a clean outcome and a painful one is preparation. Here's the pre-audit checklist we walk clients through, plus what documents to have ready, how long an examination usually takes, and when to bring in representation.

Summary Overview:

• IRS examinations come in three flavors: correspondence (by mail), office (in-person at IRS), and field (at your place of business).

• You have the right to be represented by a CPA, EA, or attorney who can attend on your behalf.

• The IRS generally requires records to be kept for at least 3 years; longer for specific situations.

• Prepare by gathering the return under exam, supporting documents, and reconciliations organized by line item.

• Most correspondence exams resolve in 6-9 months; field exams can take longer.

How do I prepare for an IRS audit?

Preparation starts the day you receive the exam notice. Six steps to run through in order:

1. Confirm the exam is real. Verify the notice number and the IRS phone number against irs.gov. Scams impersonating IRS exam notices are common.

2. Note the response deadline. Most notices give 30 days. Start the clock immediately.

3. Retain representation. A CPA, EA, or attorney can respond and appear on your behalf via Form 2848.

4. Get the return under exam. Along with every supporting document referenced on it.

5. Reconcile line by line. Compare each line item on the return to the source documents.

6. Organize the file. Group documents by return line, not chronologically. Examine work line by line.

What documents should I keep for an audit?

Keep everything that substantiates a line on you return:

• Bank statements and credit card statements

• Cancelled checks and receipts (paper or digital)

• Invoices you sent and received

• Contracts and engagement letters

• Vehicle mileage logs (contemporaneous, not reconstructed)

• Home-office measurements and utility records

• Charitable acknowledgment letters (for gifts over $250)

• W-9s from every vendor you paid

• Payroll records and 1099-NECs issued

Digital copies are acceptable if they're legible and accessible. Real-time bookkeeping systems typically store all of this automatically, one reason cloud accounting scales the audit-defense advantage.

How long should I keep records for the IRS?

IRS Publication 583 sets the retention baseline:

• General rule: 3 years from the filing date (the "period of limitations" for assessment).

• Substantial underreporting (25% or more): 6 years

• Bad debt or worthless securities: 7 years.

• Fraudulent return or no return filed: indefinitely.

• Employment tax records: at least 4 years after the tax became due or paid.

Best practice for SMBs: keep 7 years across the board. Cloud storage is cheap; substantial a 6-year old expense from memory is not.

Can I bring a CPA to an IRS audit?

Yes, and you almost always should. Under IRC §7521, you have the right to representation during an IRS examination. A CPA, EA, or attorney authorized via Form 2848 (Power of Attorney) can:

• Communicate with the IRS on your behalf

• Attend the exam in your place

• Argue your position and negotiate settements

• Sign certain documents for you

If you're representing yourself, you can also request a break at any time to consult with a representative the IRS is required to grant reasonable breaks.

How long does an IRS audit take?

Depends on the type of exam:

• Correspondence exam: typically 6-9 months from initial notice to resolution.

• Office exam (in-person at IRS): 3-6 months.

• Field exam (at your place of business): 6-18 months, sometimes longer for complex cases.

The single biggest factor in duration is documentation. Exams with well-organized substantiation resolve substantially faster than those where the taxpayer is scrambling to reconstruct records mid-exam.

What to expect during the exam itself

Each exam type looks different:

• Correspondence exam: the IRS sends a letter listing specific questions or requested documents. You respond in writing. Multiple rounds of correspondence are common.

• Office exam: you (or your representative) go to an IRS office for an in-person meeting. Bring the requested documents organized by line item.

• Field exam: an IRS Revenue Agent comes to your place of business (or your CPA's office). Field exams typically cover multiple years and multiple line items.

In all three, the examiner is looking for substantiation. If your documentation matches the return, the exam closes cleanly. If it doesn't, expect proposed adjustments and if you disagree an escalation path through IRS Appeals or Tax Court.

What to do next

The best audit defense is the file you built before the notice arrived. Clean books, contemporaneous substantiation, and organized digital records shorten every exam.

If you'd like a tax specialist to review your audit-defense readiness or to represent you in an active examination our team can help.