You'll need to amend your tax return and add the form 1099-MISC and related expenses. Because if you did not, the IRS will find out about the missing form 1099-MISC (as they have a copy) and would tax on the full amount (with deduction of expenses).
Please see the
following TurboTax FAQ for
instructions on how to amend your tax return in TurboTax.
https://ttlc.intuit.com/replies/3288565
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