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Tax Filing

Is Form 4684 required to report a casualty loss for a rental property destroyed by fire when insurance proceeds are used to rebuild?

Last updated: 
Sep 2025
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Answer

Yes, Form 4684 is required to report a casualty loss for a rental property destroyed by fire, even if insurance proceeds are used to rebuild.

Here’s the legal reasoning and process:

1. Reporting Casualty Losses for Rental Property

- When a rental property is damaged or destroyed by a casualty event such as a fire, the loss (or gain) must be reported on your tax return. The IRS requires the use of Form 4684, Casualties and Thefts, to calculate and report the amount of loss or gain resulting from the casualty event for property used in a trade or business or for income-producing purposes, such as rental property.

2. Insurance Proceeds and Rebuilding

- If you receive insurance proceeds for the destroyed property, you must still report the casualty event on Form 4684. The form is used to determine whether you have a deductible loss or a taxable gain, depending on whether the insurance proceeds exceed your adjusted basis in the property.- If the insurance proceeds are more than your adjusted basis in the property, you may have a gain, which is also reported on Form 4684. If the proceeds are less, you may have a deductible loss.

3. Postponement of Gain

- If you have a gain because the insurance proceeds exceed your adjusted basis, you may be able to postpone recognition of the gain by using the proceeds to purchase similar or related property (i.e., rebuilding the rental property). However, you must still report the event and the calculation of gain or loss on Form 4684, and then make the appropriate election to defer the gain under the involuntary conversion rules (IRC §1033) on your tax return.

4. Where to Report

- For rental property, you use Section B of Form 4684 to report the casualty or theft loss. The net gain or loss from Form 4684 is then carried to the appropriate line on your tax return (e.g., Schedule E for rental income and expenses, or Form 4797 for business property).

5. Required Even if Rebuilding

- The fact that you use the insurance proceeds to rebuild the property does not eliminate the requirement to file Form 4684. The form is necessary to document the event, the calculation of loss or gain, and any election to defer gain. The IRS uses this information to track your basis in the new or rebuilt property and to ensure proper tax treatment.

6. Summary of Steps:

1. Complete Form 4684, Section B, to report the destruction of the rental property and the receipt of insurance proceeds.

2. Calculate the loss or gain (insurance proceeds minus adjusted basis).

3. If there is a gain and you use the proceeds to rebuild, you may elect to defer the gain, but you must still report the event on Form 4684 and make the election on your return.

4. Carry the result to the appropriate form (Schedule E or Form 4797).

7. Conclusion

Form 4684 is required to report a casualty loss (or gain) for a rental property destroyed by fire, regardless of whether insurance proceeds are used to rebuild. This ensures proper calculation and reporting of any deductible loss, taxable gain, or deferred gain under the involuntary conversion rules.

If you need more details on how to complete Form 4684 or how to make the election to defer gain, let me know.

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