Where can I apply a deduction for theft losses from investment?

However, investment theft losses (like Ponzi schemes or specific profit-seeking frauds) follow different rules and are still deductible if they meet certain IRS criteria.  You must report Investment Theft Losses on Form 4684, Section B (Business and Income-Producing Property). 

• If it's a Ponzi Scheme:
  • The IRS provides a "Safe Harbor" method to simplify this.
  • In TurboTax, use Form 4684, Section C (Page 3) to calculate the loss, which then flows to Section B.
• If it's other Investment Fraud:
  • Report the loss on Section B, Part I of Form 4684.
  • These losses are generally reported as an itemized deduction on Schedule A (Line 16) but are not subject to the $100 reduction or the 10% AGI floor. 

The standard interview often fails to handle these specialized investment thefts correctly. You may need to use Forms Mode (available only in the Desktop/Download version) to enter the data directly on the worksheet. 

1. Open Form 4684: In Desktop, click the Forms icon (top right) and find "Form 4684" or the "Casualty & Theft Worksheet".
2. Select Investment Property: On the worksheet, identify the property as "Income-producing" or check the box for Ponzi-type investment if applicable.
3. Check for Worthless Stock: If the loss was simply a decline in market value due to fraud at a public company (like accounting scandals), it is NOT a theft loss. It must be reported as a worthless security on Schedule D. 

Why it Might Not Be Calculating

• If your total itemized deductions (including the theft loss) are lower than your Standard Deduction, TurboTax will ignore the loss because it wouldn't lower your tax bill anyway.
• If you accidentally entered it in the "Personal Use Property" section (Section A), the software will block it unless you also provide a FEMA Disaster Declaration Number.