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You can only get the actual W-2 from your employer. After June, you may be able to request a copy from the IRS. However, if you contact your employer (again) to request a copy, and inform the IRS you have not received it, you may be able to report the income on form 4852. If you have your final 2015 paystub, you might be able to determine the numbers that belong on the 4852. If you also have your final 2014 paystub and the 2014 W2, you can more easily see what the numbers are supposed to be.
The detailed instructions form form 4852 include:
You should always attempt to get Form W-2, Form W-2c, or Form
1099-R from your employer or payer before contacting the IRS or
filing Form 4852. If you do not receive the missing or corrected form
from your employer or payer by February 14, you may call the IRS
at 1-***-***-**** for assistance. You must provide your name,
address (including ZIP code), phone number, social security
number, and dates of employment, and your employer's or payer's
name, address (including ZIP code), and phone number. The IRS
will contact your employer or payer and request the missing form.
The IRS also will send you a Form 4852. If you do not receive the
missing form in sufficient time to file your income tax return timely,
you may use the Form 4852 that the IRS sent you.