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SS4 is application for EIN number. If already have EIN your SS4 is discarded. The IRS does not store copies of application. If you need your EIN confirmation you can request letter 147C, which is replacement for CP575 (IRS confirmation letter of your EIN). Same as SS4, CP575 cannot be reissued or replaced.
To request 147C you need to call the IRS at -***-***-**** on weekdays during normal business hours. If you have a fax machine handy, getting the form faxed to you is quicker and can help you discover how the IRS has your business listed, and if there are any errors. Otherwise, you can get this form mailed.
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