Details of Individual 401k-solo 401k plans - Vanguard
https://investor.vanguard.com/accounts-plans/small-business-retirement-plans/individual-solo-401k
Account setup & maintenance. An employer identification number (EIN) is required to establish an Individual 401 (k) plan. You can’t use your Social Security number. If you don't have an EIN, apply for one online at IRS.gov. For one-participant plans, annual filing of IRS Form 5500 is required once the plan's assets reach $250,000 at the end ...
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