From www.irs.gov:  IRS Tax Tip:
Most people get their W-2 forms by the end of January. Form W-2, Wage and Tax Statement, shows your income and the taxes withheld from your pay for the year. You need it to file an accurate tax return.
If you haven’t received your form by mid-February, here’s what you should do:

Contact your Employer. Ask your employer (or former employer) for a copy. Be sure they have your correct address.
Call the IRS. If you are unable to get a copy from your employer, you may call the …