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When your losses are more than your income from all sources for the year, you have a “net operating loss” (NOL for short).
You are allowed to apply an NOL to past tax years. This is called carrying a loss back. Your carryback period is three-years because your net operating loss was the result of theft or a casualty.
If you did not carry the loss back you can carry it forward instead until used up.
You can carry forward an NOL for up to 20 years.
So sorry to hear about your situation.
When you carry forward your NOL to a tax year after the NOL year, list your NOL deduction as a negative figure on the “Other income” line of Form 1040 or Form 1040NR (line 21).
You must attach a statement that shows all the important facts about the NOL. Your statement should include a computation showing how you figured the NOL deduction.
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