I have a 401K from a previous contracting firm that I worked with in 2017 called ADITI staffing. I did not put any money into the fund in 2018. Where do I put the loss?

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What Loss? 401K contributions (both employee and employer) are pretax items and have never been taxed in the first place. You only pay the tax when you take a withdrawal. If there was a loss in the account you will just have less to withdrawal and pay tax on. You can not deduct a loss.