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If you need to update information for your LLC’s Employer Identification Number (EIN), start by identifying what needs to be changed, such as your LLC’s name or address. Complete Form SS-4 with the updated details; this form is used for both applying for a new EIN and making changes to an existing one. Submit the form to the IRS either by mail or fax, following the instructions provided. Once submitted, the IRS will process the update and send you confirmation. If you find the process confusing or the changes complex, consider getting help from a tax professional. After updating with the IRS, remember to update your EIN information with other relevant institutions, like banks or state agencies, to keep all records consistent.