What if my w2 has the wrong tax withheld

[Shelly8]

what do I do if my w2 have the wrong Federal income tax withheld and the wrong State income tax withheld?

[IsabellaG]

You would have to go back to your employer to have them correct your W-2.

If by the end of February, your attempts to have the incorrect Form W-2, Wage and Tax Statement, corrected by your employer are unsuccessful, you can request that an IRS representative initiate a Form W-2 complaint. You may call the IRS toll free at 800-829-1040 or visit an IRS Taxpayer Assistance Center (TAC) in person.

• The IRS will send your employer a letter requesting that they furnish you a corrected Form W-2 within ten days. The letter advises your employer of their responsibilities to provide a correct Form W-2 and of the penalties for failure to do so.
• The IRS will send you a letter with instructions and Form 4852 (.pdf), Substitute for Form W-2, Wage and Tax Statement, or Form 1099-R, Distributions from Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, etc. You can use the Form 4852 in the event that your employer does not provide you with the corrected Form W-2 in time to file your tax return. 

Please see this link for more information: https://www.irs.gov/Help-&-Resources/Tools-&-FAQs/FAQs-for-Individuals/Frequently-Asked-Tax-Question...

You can prepare a return with Form 4852. In the W-2 section, you will see a screen: Do any of these uncommon situations apply to this W-2?, and you would choose Substitute form - I didn't get a W-2 from my employer and need to complete a substitute form.