Determine whether you need an SSN or an EIN
If you need an SSN: apply through the Social Security Administration (SSA)
If you need an EIN: apply through the IRS
Apply online for an EIN (fastest option) via the IRS EIN Assistant
If you can’t apply online, apply by fax or mail using IRS Form SS-4
If you’re a non-US applicant, follow the IRS EIN application instructions for foreign entities
Gather required information (typically legal name, mailing address, responsible party details, and entity type)
Submit the application and keep confirmation records
Review any eligibility requirements and processing timelines before submitting
If you’re replacing a lost EIN, use IRS procedures to retrieve it (or contact the IRS)