I sent in my taxes it was approved got a last minute w2 that need to add its not much only 20 dollars doea it matter

Yes, even that small amount needs to be added to your Form 1040...otherwise you'll get a notice from the IRS.

Since your tax return was accepted, you will need to amend your return. Please be aware that Form 1040X will not be available to prepare in TurboTax until mid-February, but once it is available, you will be able to prepare and print your amended return so that you can mail it to the IRS. You cannot e-file an amended return as this cannot be filed electronically.  The form is only filed on paper, so it will need to be printed and filed by mail. 

 Please see the following TurboTax FAQ for instructions on how to amend your 2016 tax return, if necessary,  in TurboTax.