IRS Letter 566 Explained
Understanding the IRS Correspondence Audit Letter
IRS Letter 566 is commonly used to begin a correspondence examination. The letter notifies you that the IRS is reviewing specific items reported on your tax return and requests documentation to verify those items. Unlike an office or field audit, a correspondence audit is generally conducted by mail or through secure electronic document submission.
Receiving Letter 566 does not automatically mean the IRS believes your entire tax return is incorrect. In many cases, the examination focuses on only one or several issues, such as deductions, credits, income reporting, charitable contributions, business expenses, or other items that require additional substantiation.
Understanding exactly what the IRS is requesting—and responding with organized, relevant documentation—can significantly improve the efficiency of the examination and help resolve questions before additional tax is proposed.
Key Takeaways
- Letter 566 generally begins an IRS correspondence audit.
- The examination usually focuses on specific items rather than the entire tax return.
- The IRS requests documentation supporting the items being reviewed.
- Well-organized responses are generally more effective than submitting large volumes of unrelated records.
- Responding by the deadline shown in the letter helps keep the examination moving forward.
What Is IRS Letter 566?
Letter 566 is one of the IRS's examination letters used to initiate a correspondence audit. Rather than scheduling an in-person meeting, the IRS asks the taxpayer to provide documents supporting specific items reported on the tax return. The examiner reviews those documents remotely before determining whether additional information is needed or whether proposed adjustments should be made.
The letter generally identifies the tax year under examination, explains the issues being reviewed, provides instructions for submitting documentation, and specifies a response deadline. Many correspondence examinations are resolved entirely through written communications without requiring an office visit.
Because correspondence audits typically focus on specific issues, taxpayers should carefully review the letter to understand exactly what information the IRS is requesting before preparing a response.
Why Did You Receive IRS Letter 566?
There are many reasons the IRS may begin a correspondence examination. In most cases, the IRS wants additional documentation supporting one or more items reported on your return. Receiving Letter 566 does not necessarily mean the IRS believes fraud occurred or that significant additional tax will be assessed.
Charitable Contributions
Large charitable deductions frequently require supporting documentation to verify the deduction.
Business Expenses
Business deductions may be examined to determine whether they are ordinary, necessary, and adequately documented.
Credits
Education credits, refundable credits, and other tax benefits may require additional verification.
Income Verification
The IRS may request documentation to verify reported income or reconcile information received from third parties.
A Correspondence Audit Usually Has a Limited Scope
Unlike many office or field examinations, a correspondence audit generally focuses on specific items identified by the IRS. The examiner is typically requesting documentation supporting those issues—not conducting a comprehensive review of every item reported on the return.
Providing organized documentation that directly addresses the IRS's questions is often more effective than submitting every financial record you possess. Respond to the issues identified in the letter, keep copies of everything you submit, and follow the instructions provided by the IRS.
How to Respond to IRS Letter 566
The goal of responding to Letter 566 is not simply to send documents to the IRS. Your objective is to provide organized, relevant evidence that directly addresses each issue identified in the examination letter. A thoughtful response often allows the examiner to verify the reported items more efficiently and may reduce the need for additional document requests.
Before mailing or uploading anything, review the examination letter carefully, identify every item under review, and organize your documentation so that each record supports a specific issue raised by the IRS.
Six Steps for Preparing Your Response
Identify Every Issue Under Examination
Determine exactly which deductions, credits, income items, or business expenses the IRS is reviewing. Avoid assuming the entire return is under examination if the letter identifies only specific issues.
Gather Supporting Documentation
Collect only the records that relate to the issues identified in the letter. Depending on the examination, these may include receipts, invoices, bank statements, mileage logs, brokerage statements, charitable acknowledgments, or business accounting records.
Organize Before You Submit
Arrange your documentation by issue rather than by date. Clearly label exhibits and organize records so the examiner can easily connect each document to the corresponding item on your tax return.
Prepare a Cover Letter
A concise cover letter explaining the enclosed documents can help the examiner understand your response and locate supporting information more efficiently.
Submit Your Response Timely
Respond by the deadline shown in the letter whenever possible. If additional time is needed, contact the examiner before the due date to discuss whether an extension may be available.
Retain Complete Copies
Keep copies of everything submitted to the IRS, including your cover letter, supporting documentation, and proof of mailing or electronic submission.
Documents Frequently Requested in a Correspondence Audit
Income Documentation
Forms W-2, Forms 1099, brokerage statements, settlement statements, bank records, and other documents supporting reported income.
Expense Documentation
Receipts, canceled checks, invoices, credit card statements, and accounting records supporting claimed deductions.
Charitable Contributions
Qualified charitable acknowledgments, receipts, appraisals when required, and proof of payment.
Business Records
General ledgers, profit and loss statements, depreciation schedules, payroll records, and other accounting reports.
What Happens After You Respond?
After reviewing your documentation, the examiner may accept your explanation, request additional information, propose adjustments, or conclude the examination without changes. Some correspondence audits are resolved after a single response, while others involve several rounds of document requests before the IRS reaches a conclusion.
If the IRS proposes adjustments that you do not agree with, additional administrative review or appeal rights may become available depending on the circumstances of your examination.
Common Mistakes During a Correspondence Audit
- Ignoring the response deadline.
- Submitting boxes of unrelated documents instead of organized evidence.
- Failing to explain how the documents support the reported tax treatment.
- Sending original records instead of copies.
- Providing documents that were not requested.
- Failing to retain copies of everything submitted to the IRS.
Typical Correspondence Audit Timeline
Most correspondence audits follow a predictable sequence. While every examination is different, understanding where Letter 566 fits within the process helps taxpayers anticipate what may happen next.
Audit Begins
Documentation Reviewed
Questions Answered
Changes or No Changes
Administrative Review
Possible Outcomes After Letter 566
No Change
If the documentation fully supports the items under examination, the IRS may conclude the audit without proposing any additional tax.
Additional Information Requested
The examiner may determine that additional documentation or clarification is needed before reaching a conclusion.
Proposed Adjustments
If the examiner believes adjustments are appropriate, the IRS will generally issue examination findings explaining the proposed changes and available response options.
Frequently Asked Questions
Is Letter 566 an audit?
Yes. Letter 566 generally begins a correspondence examination in which the IRS reviews specific items reported on your tax return through written communications rather than an in-person meeting.
Does the IRS think I filed my return incorrectly?
Not necessarily. The IRS is generally requesting documentation to verify particular items on the return. Many correspondence audits involve only a limited number of issues.
Can I mail copies instead of original records?
Yes. Unless specifically instructed otherwise, taxpayers generally should retain their original records and provide copies when responding to the IRS.
What if I need more time?
If additional time is needed to gather records, contact the examiner as soon as possible. In some situations, the IRS may grant additional time to respond.
Can a correspondence audit become an office or field audit?
Yes. Depending on the issues involved and the information developed during the examination, the IRS may expand or change the type of examination.
What happens if I disagree with the IRS?
If the IRS proposes adjustments that you believe are incorrect, you may have an opportunity to provide additional information, request administrative review, or pursue other appeal rights depending on the stage of the examination.
Received IRS Letter 566?
A correspondence audit is often limited to specific issues, but the quality of your response can significantly influence the outcome. Organizing your records, understanding what the IRS is requesting, and responding thoughtfully can help move the examination toward a fair resolution.
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