Types of IRS Audits: Correspondence, Office, and Field Explained
Last updated 09/17/2025 by
Ante MazalinEdited by
Andrew LathamSummary:
Quick answer: The IRS uses three main audit types: correspondence audits (by mail), office audits (in-person at an IRS office), and field audits (at your home or business). Most taxpayers only face correspondence audits, which request proof of income or deductions. More complex cases may escalate to office or field audits.
IRS audits vary in scope and complexity. While most are resolved by mail, some require face-to-face meetings or on-site visits. Here’s a breakdown of each type and how to prepare.
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1. Correspondence audits
These are the most common and least invasive audits. The IRS contacts you by mail asking for supporting documentation.
- Typical issues: Unreported 1099 income, mismatched W-2s, or questionable deductions.
- IRS notices:CP2000 for income mismatches, CP11 or CP12 for math or credit changes.
- How to respond: Mail or upload requested documents within the deadline.
2. Office audits
Office audits are conducted at a local IRS office and usually focus on specific issues.
- Typical issues: Schedule C expenses, itemized deductions, or business use of home/vehicle.
- Notices: Audit appointment letters, sometimes followed by CP14 if additional tax is due.
- How to prepare: Bring organized documentation (receipts, ledgers, mileage logs). Professional representation is recommended.
3. Field audits
Field audits are the most comprehensive and serious type, conducted at your home, business, or accountant’s office.
- Typical issues: Complex returns, business payroll, large deductions, or suspected underreporting.
- Handled by: Revenue agents who can examine multiple years of returns.
- How to prepare: Have a CPA, EA, or tax attorney represent you. Ensure records are complete and reconciled with returns.
Comparison of IRS audit types
| Audit Type | Where It Happens | Common Issues | Notices Involved | Complexity |
|---|---|---|---|---|
| Correspondence | By mail | Income mismatches, small deductions | CP2000, CP11, CP12 | Low |
| Office | IRS office | Schedule C expenses, home office, itemized deductions | CP14 if balance due | Medium |
| Field | Home, business, or accountant’s office | Business operations, payroll, large deductions | Audit appointment + potential collection notices | High |
Real-life scenarios
- Correspondence audit: A freelancer forgot a 1099-NEC. The IRS sent a CP2000 notice, which was resolved with documentation and a small payment.
- Office audit: A taxpayer claimed a large home office deduction. The IRS requested receipts at an office audit and disallowed part of the deduction.
- Field audit: A construction business underwent a field audit. With CPA representation and complete payroll records, adjustments were minimized.
Key takeaways
- Most taxpayers face correspondence audits handled by mail.
- Office audits focus on deductions and small business issues.
- Field audits are the most serious and require professional help.
- Respond promptly to notices to avoid escalation into collections.
Trusted Tax Relief Companies
Need help beyond audits? Explore our tax preparation companies to keep your returns accurate and compliant.
Next Steps
- Review what happens during an IRS audit to understand the process.
- If you’ve received a CP2000 notice, learn how to respond effectively.
- For disputed results, explore audit reconsideration or appeal options.
Related Guides
- What Is an IRS Audit? — Basics of why and how audits happen.
- What Triggers an IRS Audit? — Common red flags that increase audit risk.
- How Far Back Can the IRS Audit You? — Rules for the statute of limitations.
- IRS Audit vs Investigation — How audits differ from criminal cases.
Frequently Asked Questions
Which type of IRS audit is most common?
Correspondence audits are the most common, representing about 75% of all audits.
Do all office audits result in penalties?
No. If you provide documentation that supports your deductions, the IRS may accept your return as filed.
Can a correspondence audit turn into a field audit?
Yes. If the IRS uncovers significant discrepancies, a case can escalate into a more serious field audit.
How long do different audits take?
Correspondence audits may resolve in weeks, office audits in months, and field audits can last a year or more.
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