The Base Expense Ratio is the core cost of running a mutual fund scheme before adding distributor commissions — it forms the foundation of the Direct Plan's TER.
Every mutual fund's total cost (TER) is built from a base expense ratio plus distribution-related charges. The base includes the AMC management fee, custodian charges, audit fees, and other fixed operational costs. SEBI mandates a maximum base expense ratio (which varies by AUM slab). The Direct Plan's TER equals approximately the base expense ratio. The Regular Plan's TER equals the base expense ratio plus the distributor trail commission.
Think of the base expense ratio as the 'wholesale price' of running the fund — the minimum cost regardless of how you buy it. The Direct Plan charges you roughly the base expense ratio. The Regular Plan charges you the base expense ratio plus the distributor's commission markup. Knowing the base expense ratio helps you understand how much of the cost difference between Direct and Regular Plans is the distributor's cut.
SEBI limits base expense ratios by category — equity active funds ≤ 1.05% (on first ₹500 crore), declining further as AUM grows.
Index funds have the lowest base expense ratios — often under 0.1%.
Base expense ratio is the same whether you invest in Direct or Regular Plan (the distribution commission is the add-on for Regular).