It depends. Since it is a 2015 form, you will be penalized if you owe money to the IRS, because the filing deadline for 2015 forms passed almost 2 years ago, and this form must be included with your 2015 return, not this year. However, if you are getting a refund (or additional refund), you will not have a penalty.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"