My employer included all my relocation expenese on my w2 as income. they also issued me a form 3903 with the break down of expenses. how do i proceed?

THIS ANSWER IS VALID FOR TAX YEARS PRIOR TO 2018. 

You can claim moving expenses (if you qualify for time and distance tests) and if it was  included in your gross income (box 1 of form W-2).  

If your moving reimbursement was included as taxable income, your paid expenses are deductible by you. 

Any reimbursement that was not taxed cannot be deducted. 

To add moving expenses (before filing):

1. Sign In  or Open TurboTax

2.  Select "Take me to my return" (Online)

3.  Select "My Account" on top right of the screen (Online)

4.  Click on "Tools"

5.  Go to "Topics Search" (Online) or "Search Topics" in the top center of the screen (Desktop)

6.  Type "moving expense for a job-related move" and press "enter" (Online) or “ok” (Desktop) to add moving expenses.

Add the information from the Form 3903 your employer provided to complete the moving expense interview in TurboTax.

[Edited 06/25/20 | 1:12 pm PST]