If you received any W-2 or 1099 forms you'll want to mail those to the IRS along with your return. More information on what to mail with your return can be found below.
From the IRS website, items you should mail with your returns also include:
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Form W-2. Form W-2 is a statement from your employer of wages and other compensation paid to you and taxes withheld from your pay. You should have a Form W-2 from each employer. If you file a paper return, be sure to attach a copy of Form W-2 in the place indicated on the front page of your return. Attach it to the front page of your paper return, not to any attachments. For more information, see Form W-2 in chapter 4.
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Form 1099-R. If you received a Form 1099-R, showing federal income tax withheld, and you file a paper return, attach a copy of that form in the place indicated on the front page of your return.
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Form 1040EZ. There are no additional schedules to file with Form 1040EZ.
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Form 1040A. If you file a paper return, attach any forms and schedules behind Form 1040A in order of the “Attachment Sequence Number” shown in the upper right corner of the form or schedule. Then arrange all other statements or attachments in the same order as the forms and schedules they relate to and attach them last. Don't attach items unless required to do so.
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Form 1040. If you file a paper return, attach any forms and schedules behind Form 1040 in order of the “Attachment Sequence Number” shown in the upper right corner of the form or schedule. Then arrange all other statements or attachments in the same order as the forms and schedules they relate to and attach them last. Don't attach items unless required to do so.
The link to this information can be found here, click on "Attachments" to view: https://www.irs.gov/publications/p17/ch01.html#en_US_2016_publink1000170590
