Forward Pricing and the Fund Cut-Off Time
Mutual fund orders don't fill at the price known when you place them — every order placed before a daily cut-off time fills at whatever NAV is calculated after the market closes that same day, a rule designed specifically to prevent stale-price gaming.
Prerequisites: NAV Calculation and Fund Accounting
Buy or sell an ETF and you get the price on the screen at that instant. A mutual fund works completely differently: orders placed at any point during the trading day all fill at the same price — the fund's net asset value calculated once, after the market closes. This is called forward pricing, and it's a specific rule (in the U.S., SEC Rule 22c-1), not just an operational convenience.
How the cut-off works
Every mutual fund sets a daily cut-off time, almost always 4:00pm Eastern to match the U.S. stock market close. Any buy or sell order that reaches the fund (or, more commonly, the broker or platform routing to the fund) before the cut-off gets that same day's NAV, calculated using closing prices for everything the fund holds. Any order that arrives even a minute after the cut-off is pushed to the next business day's NAV instead — there's no partial credit for being close.
A concrete example: an investor places a sell order for fund shares at 3:55pm, five minutes before the 4:00pm cut-off. That order fills at the NAV calculated using today's closing prices, published shortly after the close. An investor who places an identical order at 4:05pm — ten minutes later — gets tomorrow's NAV instead, calculated from tomorrow's closing prices, whatever the market does between now and then. Both investors placed "same-day" orders in a loose sense, but only one actually got today's price.
Why the rule exists
Before forward pricing was strictly enforced, there was room for a specific abuse: if an order could be priced using a NAV that was already calculated, a favored client (or an employee) with access to the current NAV before it was public could place trades knowing exactly what price they'd get relative to news that broke after the close — effectively trading with information the price hadn't caught up to yet. Forward pricing removes that edge entirely: nobody knows the exact NAV their order will fill at when they place it, because it depends on closing prices that haven't been finalized yet.
What this means in practice
Forward pricing means a mutual fund investor reacting to breaking news at 4:15pm can't get today's price no matter how they route the order — the door for that day already closed. It also means every order placed anywhere between market open and the cut-off is economically identical in terms of the price received, which is very different from how an ETF or stock order works, where timing during the day genuinely changes the fill price.
Mutual funds use forward pricing: every order placed before the daily cut-off time (typically 4:00pm Eastern) fills at that day's end-of-day NAV, and every order placed after it fills at the next day's NAV instead — a rule built specifically to prevent trading on a NAV that's already effectively known.
A classic mistake is assuming a mutual fund order placed mid-afternoon fills at something close to the current intraday value of the fund's holdings. It doesn't — it fills at end-of-day NAV regardless of when during the day it was placed, which can matter a lot if the market moves sharply between the order time and the close.
Related concepts
Practice in interviews
Further reading
- SEC Rule 22c-1, Pricing of Redeemable Securities