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There is no deferred gain. There is postponed gain.

Postponement of Gain

Don’t report a gain if you receive reimbursement in the form of property similar or related in service or use to the destroyed or stolen property. Your basis in the new property is generally the same as your adjusted basis in the property it replaces.

You must ordinarily report the gain on your stolen or destroyed property if you receive money or unlike property as reimbursement. However, you can choose to postpone reporting the gain if you purchase property that is similar or related in service or use to the stolen or destroyed property within a specified replacement period, discussed later. You can also choose to postpone reporting the gain if you purchase a controlling interest (at least 80%) in a corporation owning property that is similar or related in service or use to the property. See Controlling interest in a corporation, later.

If you have a gain on damaged property, you can postpone reporting the gain if you spend the reimbursement to restore the property.

To postpone reporting all the gain, the cost of your replacement property must be at least as much as the reimbursement you receive. If the cost of the replacement property is less than the reimbursement, you must include the gain in your income up to the amount of the unspent reimbursement.

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