I need to file a form 843 because my employer won't issue a corrected W2c for the overpayment of social sercuity tax witholdings I had. In the instructions forms that go

[VolvoGirl]

Ok lets check this out.  What is on your W2 in box 1, 3 & 4?  Do you have more than 1 W2?

[gulden-christoph]

Yes, two W-2s from the same employer with the same EIM number. They withheld $1213 too much. I need the address of where to send the form 883 as in the instructions that go along with it it says -Address shown in the notice-but I can't find the address.

[VolvoGirl · Accepted solution]

See this FAQ bottom section,
https://ttlc.intuit.com/questions/1899484-w-2s-and-excess-social-security-payroll-taxes-withheld  

If your employer does not (or cannot) comply with your request, use Form 843 Claim for Refund to get a refund of the overpayment.
http://www.irs.gov/pub/irs-pdf/f843.pdf

and instructions
http://www.irs.gov/pub/irs-pdf/i843.pdf