TD e-Series funds are index mutual funds, meaning that they follow a passive investment strategy, and are designed to replicate the performance of an underlying stock market index. As an example, for many years, the Canadian equity holdings of TD e-Series funds have mirrored the S&P/TSX index. Collapse Index Investing with e-Series Funds. Exclusively for TD clients investing online, e-Series Funds typically provide lower Management Expense Ratios than actively managed funds. In addition, there are no commission fees to buy or sell. 1 That means it's easy to set up a regular investment plan for no extra cost. TD e-Series Funds. You can build a low cost, broadly diversified portfolio with just four index funds from the TD e-Series family. Just use this simple asset allocation: The strategy is touted as a good option for beginners because it gives investors a simple way to set-up a low-cost, broadly diversified portfolio.