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Business Investment Loss from prior year
You need to give specific dates! In the United States, you have three years to file an amended tax return. https://www.irs.gov/uac/Newsroom/Ten-Facts-about-Amended-Tax-Returns Did the restaurant fail in 2012? If so, that's probably the year to take the loss. If you need to amend your 2012 return, which you filed in 2013, you should have until 2016 to file this. The exact date may be based on when you filed 2012 taxes!