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Rules for SEP contributions in an LLC?
From Schwab -  What are the eligibility requirements for a business to establish a SEP-IRA? Almost any type of business is eligible to establish a SEP-IRA, from self-employed individuals to multi-person corporations (including sole proprietors, partnerships, S and C corporations, and limited liability companies [LLCs]), tax-exempt organizations, and government agencies. What are the contribution limits? You may contribute up to 25% of compensation (20% if you’re self-employed3) or $49,000 for 2011 and $50,000 for 2012, whichever is less. If we set the PC aside, you and the son have an LLC renting office space, this addresses the ability of the LLC to offer the retirement account.