My w2 has one wrong number on my social, is it ok for me to just add in the correct number and continue?

The best course of action is to request a corrected W-2 from your employer as soon as possible. 

For the purpose of completing your tax return, if you feel that everything else looks correct based on your pay stubs then you can go ahead and use the W-2 that you have in hand.  That does not necessarily mean that you should file the return before having the W-2 corrected.

Until it is corrected, the IRS will not have the document available to match to your social security number and it could lead to an examination of your return because of the mismatch.

Additionally, if your social security number is incorrect, then you will not get credit for those wages with the Social Security Administration and your future benefits would be affected. 

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