Due to the ETMF’s structure, active managers can reduce the capital gain hit when selling underlying assets. In a traditional open-end fund, the fund has to sell assets to meet investor redemptions, which can create a realized capital gain for everyone else. Additionally, when a manager rebalances, the action can also create realized gains and generate a tax bill for long-term investors.

ETMFs utilize ETF’s so-called in-kind swaps to limit the tax hit. The funds undergo a creation and redemption process in which market makers, authorized participants or large institutional investors swap a basket of securities from the underlying benchmark index for fund shares, or vice versa. Consequently, the funds don’t trigger a taxable event.

However, unlike traditional ETFs, ETMFs will not disclose holdings on a daily basis. The patented methodology allows the funds to trade just once per day at the close of business, but investors can still buy and sell ETMFs in real time during normal hours. Consequently, investors who enter a trade during the day will pay a slight premium to net asset value to acquire shares or receive slightly less than NAV to sell.

Since ETMF transactions occur just once per day, the SEC’s portfolio disclosure requirements will mirror traditional open-end funds, revealing holdings on a quarterly basis.

Along with the potential tax savings, ETMFs could help cut costs in other ways, compared to active mutual funds. For example, traditional open-end funds bear the costs of investors moving in and out of funds, some active funds hold greater cash reserves to meet potential redemptions and many funds charge 12b-1 fees.

Time will tell if the new structure will attract investors. Nevertheless, proponents argue that ETMFs may be an improvement over traditional mutual funds due to the new structure’s lower costs and potential tax efficiency.