Back-End Load.
A definition, in plain English — with the books that teach it.
What it means
A back-end load, formally called a contingent deferred sales charge (CDSC), is a mutual fund fee assessed when an investor redeems shares rather than at the time of purchase. Unlike a front-end load that reduces the initial investment immediately, a back-end load allows the full contribution to enter the fund on day one but extracts a percentage of the redemption amount — typically on a sliding scale — when the investor exits. The standard structure charges the highest fee in the first year (often 5% or 6%) and reduces the percentage by one point annually, reaching zero after five to seven years of holding. Class B shares of traditional load-fund families are the most common vehicle for back-end loads. The deferred structure creates an illusion of accessibility because investors see the full amount enter the fund, but it also creates a behavioral lock-in: leaving the fund early triggers a meaningful penalty. This can be damaging when an investor needs liquidity, when the fund underperforms, or when lower-cost alternatives emerge. After the CDSC holding period expires, Class B shares often convert to Class A shares automatically. Critics note that when total cost of ownership — including the higher ongoing 12b-1 fees typically embedded in Class B shares — is accounted for, back-end load funds are frequently more expensive over a full holding period than straightforward front-end load alternatives, despite their superficially investor-friendly deferral structure.
Example
An investor buys $25,000 in Class B shares of a mutual fund subject to a 5% CDSC in year one, declining 1% per year. Two years later, facing a family emergency, the investor redeems the full balance, now worth $27,000. The back-end load at year two is 3%, costing $810 in exit fees — a real cost the investor did not anticipate when the "no upfront charge" framing made the fund feel free to enter.