In the recent case of Soroban Capital Partners LP v. Commissioner, 161 T.C. No. 12 (2023), the Tax Court held that the limited partner exception under section 1402(a)(13) does not apply to limited partners who the Court concluded were not limited partners “as such”; thus certain “limited partners” of a partnership may be subject to Self-Employed Contributions Act tax. The Tax Court in Soroban held that determining a “limited partner” for section 1402(a)(13) purposes requires a factual inquiry into the functions and roles carried out by such limited partner. If the factual inquiry shows that a limited partner is heavily involved in the partnership’s business and/or performed services for the partnership, such limited partner’s distributive share may be subject to Self-Employed Contributions Act tax.