Just a heads up if anyone is considering this option- between the 7 day hold period and 3-5 business days for the ACH transfer of funds, it could take potentially two weeks before you are able to buy a treasury bond or brokered CD through vanguarid. Is it the same with Fidelity or Schwab ? Seems like you have to keep your money on call, earning 0% interest, to snag a CD deal.
Answers

Where did you get the 0% interest figure from?
The 7-day SEC yield on Vanguard's settlement fund (VMFXX) is 2.16% as of Sept. 16, 2022.
https://investor.vanguard.com/investment-products/mutual-funds/profile/vmfxx#price
"3-5 business days for the ACH transfer of funds"
Where did you get the 3-5 business days timetable from?
When I transfer funds to Vanguard, their website always tells me to allow 2-3 business days for funds to arrive (2 days if transfer initiated during market hours, otherwise three days). When I initiate the transfer during market hours, it's almost always only one business day.
"the 7 day hold period"
The hold period (I don't recall whether it's six or seven days) prevents you from withdrawing funds from Vanguard. It permits you to make trades. I recall seeing language on Vanguard's website that indicates that such funds may not be available for certain trades during that period, but I've never had a problem in that regard. But, yes, there is certainly a possibility that you'd have to wait until the expiration of the hold period.


