A side letter is a supplemental agreement between a fund's general partner and a specific limited partner that modifies the standard terms of the Limited Partnership Agreement (LPA) for that investor. Side letters are a standard practice in private fund structuring, used to accommodate the specific requirements of large institutional investors — pension funds, sovereign wealth funds, endowments — whose capital commitments justify customized terms.
Common Side Letter Provisions
Fee modifications: Reduced management fees or carried interest rates for large commitments. Most Favored Nation (MFN) clauses: Guaranteeing the LP receives terms at least as favorable as any other investor. Co-investment rights: Priority access to co-investment opportunities alongside the fund. Enhanced reporting: Additional reporting beyond standard quarterly reports, such as position-level detail, ESG metrics, or custom analytics. Transfer rights: Modified restrictions on transferring LP interests. Key person provisions: Enhanced protections if key investment professionals depart.
Side Letter Administration Complexity
Side letters create significant operational complexity. A fund with 50 investors and 20 side letters may have 20 different fee structures, 15 different reporting requirements, and 10 different co-investment priority levels. Manual administration of side letter provisions across waterfall calculations, reporting cycles, and distribution processing is error-prone and difficult to audit. Automated fund administration platforms store side letter terms as investor-specific parameters, applying the correct fee rates, reporting templates, and allocation rules automatically for each LP.