I guess mine is maybe a "modified hub"...
From a "hub" perspective - I use a Fidelity CMA - with a nominal amount of $ (mostly to maintain a MM fund that pays higher than a core position). It is the
only account with an
outside link - either in or out. The idea being if I need to move money from institution A to institution B - it "flows" through the "hub".
As an example, the "hub" account is the
only linked account to my HMBradley account (which
used to be my "savings" account, although most of that has been moved into Fidelity and into T-Bills - but not relevant for this example). [Most years] We'd accumulate "cash" into HMBradley account, such that by end of year we'd have enough to front-load IRA, HSA, 529, and I & EE Savings bonds. By 1/1 we'd "pull" the funds from our "savings" account into the "hub" account. And then the money is either "automatically" withdrawn from the hub account (for example, IIRC our IRA's and 529 have an "automatic" investment to pull from the "hub", manually transferred (for example the HSA is funded from payroll - but we backfill "checking" since our net pay is reduced), or left for external use. Buying our I & EE Bonds from Treasury Direct is a great example of this last scenario, as the
only account linked to TD is our "hub" account.
This setup make's it easy for us to "change" accounts - like when we switched from HMBradley as our "savings" account to using a
different Fidelty CMA with T-Bills as our "savings" account. I just did the "transfer" from my
other Fidelity account instead of HMBradley, and everything else worked the same. I don't have to worry about needing to "change links", change "automatic" investments/transfers/etc.. And the only "maintenance" is if/when we "add" a new account - and we just need to link that account once with our "hub" account - and then via the hub we can send/receive money between
all of our accounts (without change).
As noted, we keep a nominal amount in the account - if it makes it simpler - think of the account as having $0 normally. Which also means that should any of our "links" and/or our "accounts" be compromised - there is normally $0 in the account that could be "stolen". Conversely, if there is money in the account - it's a
sign I need to do something with it! For example, any dividends/interest in our "taxable" Fidelity accounts are automatically "swept" into this "hub" account, as is any "excess income" from my paycheck. So, if I see any money in the "hub" account - unless it was "waiting" there for something else (such as buying I & EE Bonds) - it's "waiting" to be moved/invested as per my AA.
The "modified" part is that we still do the bulk of our "transactions" through our "checking" account, which has checks, an ATM/debit (that we rarely use), handles auto-pay on credit cards/utilities/etc., as well as has direct deposit configured. This ultimately was simpler for us - as it separates our "normal expenses/income" from our "other stuff". As an example, let's say we spend $5k a month, our direct deposit is setup to put $5k a month into "checking" and anything beyond (aka "excess income") goes into our "hub" account (actually some flows to
other accounts too that have DD requirements - but not relevant). For example, let's say I get a bonus, that "excess" shows up in my "hub" account - where I can easily see "oh I need to do something with that money". And then my process looks something like:
- Add to "checking" if its running low...
- Add to "savings" until I'm at my "target" cash (as a reminder, I try to accumulate enough "cash" to front-load next years investments)
- Invest anything else as per my AA (aka move funds to my brokerage account and buy more stocks or bonds as needed to maintain my AA)
This "modified" part - with things like direct deposit, auto payments, etc. configured
could have more "work" if we ever switch checking... But candidly, I don't see that as likely... Fidelity CMA has been awesome for us - we can use a higher rate MM fund if we want, no fee on ATM, fits into our [mostly] "one-stop-shop" with Fidelity, etc. Fidelty would have to end its CMA/checking offering, or something else "amazing" would have to exist for us to even consider that... As such - this works for us. It's not
exactly a "full hub" - but works for our needs.