Fillable IRS Form 4684 – Casualties and Thefts

What Is Form 4684?

IRS Form 4684, Casualties and Thefts, is used to report losses from property damage, natural disasters, or theft. The form allows individuals and businesses to claim a deductible loss on their federal tax return.

How to Complete Form 4684 Online

With Formize’s built‑in PDF filler you can fill out Form 4684 directly in your browser—no download, print, or manual entry required.

1. Click the "Fill out this form" button on this page.
2. Wait a few seconds while the Formize PDF Filler app loads the fillable version of Form 4684.
3. Enter your personal information, loss details, and insurance reimbursements exactly as the instructions describe.
4. Review the calculated deductible loss that appears automatically.
5. Save the completed PDF or download it to attach to your tax return.

Common Mistakes to Avoid

• Skipping the disaster declaration check: For personal‑use property, a loss is only deductible if it results from a federally declared disaster.
• Incorrect basis calculation: Use the original cost or adjusted basis, not the current market value.
• Omitting insurance reimbursements: All insurance or other reimbursements must be reported on Line 3.
• Failing to attach supporting documents: Receipts, police reports, and insurance statements should accompany the form.

Download the Fillable PDF

If you prefer the traditional method, you can download the official fillable PDF from the IRS. The file is fully compatible with Formize’s online editor.

Download IRS Form 4684 (PDF)

FAQs About Form 4684

Below are the most common questions taxpayers have about Form 4684.