How do I access my w2 from 2015?

1. Contact your employer and have them email, fax or mail you a copy. 

Or and

2. Go to IRS.gov and get a wage and income transcript.  

You can also get a copy of the actual W2 from the Social Security Admin, but there is a charge.

TurboTax does not have a copy of your W-2—the Wage & Tax Statement—issued to you by your employer.  You should always save those documents for your own records. You could ask the employer(s) for copies or you can get a copy from Social Security (for a fee).

https://faq.ssa.gov/link/portal/34011/34019/Article/3836/How-can-I-get-a-copy-of-my-wage-and-tax-statements-Form