Applying online with an SSN or ITIN gets you the number in the same session. Fax applications generally come back within a few business days. Mail is the slowest route.
Founders without a US tax ID cannot use the online tool, which is where most delays come from. Our guide to getting an EIN explains which route applies to you and how to prepare the SS-4 so it clears the first time.
We handle this for founders running US companies.
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