Yes, you will need to amend the tax return and include the form because the IRS is also receiving the form. They will be looking for it on your tax return.
But wait until the originally filed return is fully
processed before attempting to amend. This will avoid errors with the IRS.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
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