Check your EIN confirmation letter (CP 575) first. If that is gone, look at a previously filed tax return, a business bank account application, or any 1099 you have issued. Your bank or your payroll provider will also have it on file.
If none of those work, call the IRS Business and Specialty Tax Line and ask for the number to be read back to you. You have to be an authorized person on the account. We walk through every method in how to search for your EIN.
We handle this for founders running US companies.
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