https://www.sec.gov/Archives/edgar/data/891190/000168386320015018/f7596d1.htm(VUSXX)
497 1 f7596d1.htm VANGUARD TREASURY MONEY MARKET FUND 497
Vanguard Treasury Money Market Fund
Supplement Dated December 10, 2020, to the Prospectus and Summary Prospectus Dated December 20, 2019
Effective immediately, the investment minimum for Vanguard Treasury Money Market Fund (“Fund”) is lowered from $50,000 to $3,000. All references to the Fund’s minimum investment amount are hereby updated to reflect the new investment minimum.
© 2020 The Vanguard Group, Inc. All rights reserved.
Vanguard Marketing Corporation, Distributor.PS 030K 122020
Comments
Okay, I'm being a bit flippant here. But some people want the absolute highest measure of safety, and that comes when invested purely in Treasuries (or your mattress). Here is an extensive piece describing the differences between the types of government MMFs.
https://www.wellsfargoassetmanagement.com/assets/public/pdf/insights/investing/a-guide-to-government-money-market-funds.pdf
The fund's largest monthly loss was -1.08% during this past March.
Since 2016, VUSFX has generated only two monthly losses (other loss was -0.05%).
Max drawdown of VUSFX was 1.4% between March 11 and March 20
Vanguard Short Term Tax-Exempt Fund's inception was Sept 1, 1977. In 2001, Vanguard added Admiral shares. Doesn't matter, the fund did not have a down year all the way back to 1977.
As far as pulling the trigger goes, the question is: what risk is of concern? IMHO, the risk is not one of temporarily seeing one's balance decline (" I can also definitely withstand [a] drawdown"), but of having made less than the alternative when the cash is withdrawn. This is why, e.g. one might look at monthly drawdowns rather than true day-to-day drawdowns.
The longer the time frame, the greater the risk becomes of making less money with the MMF. Conversely, when used as a checking account, the risk of making less money with an (ultra) short bond fund increases. So keep three months, six months, even a year's cash in a high yield savings account or a bunch of no penalty CD (which insures against the risk of yields dropping).
Longer than that and the risk of making less money in the bond fund is rather small. Even it it returns less it won't be that much less; on the flip side, the risk of substantially underperforming with the bank/MMF becomes significant.