The short version

An IRS notice about a theft loss deduction is not just a paperwork problem. It is a deadline-driven dispute over whether your facts fit the loss rules, whether the year is right, whether reimbursement is still possible, and whether the proof file supports the number on the return.

If the IRS questions the deduction, start with the notice number, the response deadline, the exact adjustment, and the documents the IRS is asking for. Then build the response around the rule that applies to your facts rather than sending a loose stack of bank records, screenshots, and police reports.

What the law actually says

IRC section 165 allows a deduction for a loss sustained during the taxable year and not compensated by insurance or otherwise. For individuals, the statute separates business losses, losses from transactions entered into for profit, and certain personal casualty or theft losses. A theft loss is generally treated as sustained in the year the taxpayer discovers the loss.

For scam and theft cases, IRS Publication 547 is the current public IRS guide that matters most at the notice-response stage. It says victims of certain financial scams may claim a theft loss deduction under section 165 only when the loss results from theft under applicable state law, there is no reasonable prospect of recovery, and the loss arose from a transaction entered into for profit. It also tells taxpayers to be ready to prove ownership, that the property was stolen, when the loss was discovered, whether reimbursement is reasonably expected, and the amount claimed.

That is why the IRS challenge usually turns on four questions:

Was there a theft or scam that qualifies under applicable law?
Was the loss connected to a trade or business or a transaction entered into for profit?
Was there a reasonable prospect of recovery in the year claimed?
Does the file prove the amount, timing, ownership, and reimbursement analysis?

How the IRS challenge usually starts

The first document controls the next move. The IRS notice page says the IRS may send a letter when it has a question about a return, changes or corrects a return, needs identity verification, or shows a balance due. The IRS also tells taxpayers to review the notice carefully, act by the due date if a response is requested, and send information and copies of documents when disputing the notice. See Understanding your IRS notice or letter.

In a theft loss case, the response should not begin with “I was scammed.” It should begin with a file map:

Issue the IRS may test	Response file section
Whether the loss was a theft	Police reports, platform reports, complaint records, criminal-statute analysis, and transaction narrative
Whether the transaction was entered into for profit	Investment pitch, communications, account setup, transfer records, expected-return facts, and nonpersonal motive evidence
Whether recovery was reasonably possible	Insurance claims, exchange or bank recovery attempts, law-enforcement status, civil claims, bankruptcy or receivership records, and reimbursement correspondence
Amount and timing	Transfer records, wallet or account statements, basis records, date discovered, reimbursements received or expected, and Form 4684 workpapers

If the notice is a simple request for documents, the immediate goal is a complete and organized response. If the IRS has already proposed an adjustment, the goal is different: preserve disagreement rights, build the legal position, and avoid missing the window for Appeals or court review.

How audits change the posture

An IRS audit is more formal than a notice exchange. The IRS audit page says the IRS will provide a written request for the specific documents it wants to see, and that taxpayers must keep records used to prepare a return for at least three years from the date the return was filed. The same page says the IRS generally can include returns filed within the last three years in an audit, may add years if it identifies a substantial error, and usually does not go back more than the last six years. See IRS audits.

For many mail audits, the IRS says it can ordinarily grant a one-time automatic 30-day extension if you request it in writing by fax or mail using the notice instructions. That is not the same as extending every deadline. If the IRS has issued a certified Notice of Deficiency, the IRS audit page says it cannot extend the time to submit supporting documentation, and the time to petition the U.S. Tax Court cannot be extended beyond the original 90 days.

In practice, an audit response for a theft loss deduction should usually be organized like a defense file, not like a tax organizer. The strongest file connects each document to a specific element of the claim: theft, profit motive, discovery year, amount, and reimbursement analysis.

The numbers that affect the response window

IRS process point	Figure	Why it matters
Mail audit extension	30 days	IRS says it can ordinarily grant a one-time automatic 30-day extension for many mail audits when requested through the notice instructions.
Notice of Deficiency petition window referenced by IRS audit guidance	90 days	IRS says it cannot extend the time to petition the U.S. Tax Court beyond the original 90 days.
Appeals small case request threshold	$25,000 or less per tax period	IRS Appeals says a Small Case Request may be used when the additional tax and penalty proposed for each tax period is $25,000 or less from an audit.
Online long-term payment plan threshold for individuals	$50,000 or less	IRS payment-plan guidance says individuals may qualify to apply online for a long-term plan if combined tax, penalties, and interest are $50,000 or less and required returns are filed.
Online short-term payment plan threshold for individuals	Less than $100,000	IRS payment-plan guidance says individuals may qualify to apply online for a short-term plan if combined tax, penalties, and interest are less than $100,000.
Short-term payment plan period	180 days or less	IRS payment-plan guidance describes a short-term plan as paying the amount owed in 180 days or less.

The figures in this table come from IRS audits, Preparing a Request for Appeals, and Payment plans; installment agreements.

If the IRS disallows the deduction

A disallowed theft loss deduction does not always mean the dispute is over. The next step depends on the notice type, the response window, and whether the IRS has issued a proposed adjustment, a final adjustment, or a Notice of Deficiency.

If Appeals is still available, the request should focus on the disputed facts and law rather than emotion. IRS Appeals guidance explains that a small case request may be available for certain audit disputes at or below the $25,000 per-period threshold. Larger or more complex cases may need a formal written protest.

If you agree with the tax but cannot pay the full balance, the strategy shifts from deduction defense to collection resolution. IRS payment-plan guidance describes online eligibility thresholds for individual short-term and long-term payment plans, but eligibility depends on the taxpayer’s full account facts, filing compliance, and balance.

What to do before you respond

Before sending a response, answer these questions:

What exact notice or letter number did the IRS issue?
What is the response due date?
Is the IRS asking for documents, proposing an adjustment, or issuing a deficiency notice?
Which tax year and which line item are at issue?
Does the file prove theft, profit motive, discovery year, amount, and reimbursement analysis?
Are there related issues such as penalties, interest, state notices, amended returns, or payment-plan needs?

Do not send original records unless the IRS specifically requires them. Send organized copies, keep a complete copy of the submission, and track delivery.

How Sheepdog Tax Resolution can help

Upload your IRS notice and request a response strategy. The review focuses on the notice deadline, the IRS issue, the §165 proof file, the response options, and whether the matter belongs in document response, audit defense, Appeals, payment planning, or another resolution path.

Sheepdog Tax Resolution is veteran-owned and operated by Noah Green, CPA, CFE. No result is guaranteed, and the right strategy depends on the notice, the deadline, and the records available to support the position.

Sources

Prepared by Noah Green, CPA, CFE.

IRS Challenges to §165 Loss Deductions: Notices, Audits, Appeals, and Resolution Options