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Can I find Form Letter 147C online?
Thanks for the question.
If you don't have your original CP575 notice that IRS sent assigning your EIN, you will need to call IRS to get a Letter 147C issued to you. The Letter 147C will confirm your EIN. The IRS business help line can help you at 1-***-***-****. The hours of operation are 7a.m.-10p.m. local time, Monday-Friday.
You may send a written request letter 147C but it would be faster to call and request on the phone.
Hope this helps,