Thanks all...
@Scandium, clarifying -- I am content with the level of automation that my employer provides with my 403(b) but am seeking to achieve a similar level of automation (or as close as possible) with my taxable/IRA accounts. Unfortunately, my employer does not manage those accounts, I manage them on my own through a separate brokerage acct.
Thanks all for for the advice on scheduling transfers from bank accts. to brokerage accts. that is helpful.
I took a bit of time this afternoon to call M1 Finance and Betterment to inquire about their services and was able to learn a bit more:
*Neither service actually offers direct deposit, and so the direct deposit system I was envisioning of sending a slice/percentage of my paycheck directly to one of these services would not be feasible, at least for now.
*They both offer some useful functionality with regard to automating IRA investing: much like a full-featured brokerage, you can set frequency for bank transfers to an IRA and then they will automatically purchase shares to match whatever allocation you have established.
*Unlike most traditional brokerages, they will automatically purchase fractional shares of ETFs the moment your money is transferred in and they will automatically keep your portfolio balanced according to whatever allocation you determine at the outset -- e.g. 80% S&P 500 ETF, 20% Bond ETF -- and maintain that balance.
*They will automatically start contributing to the following year once your IRA reaches the contribution limit ($6000) for a given year.
*If you max out an IRA they will stop drawing $$ from your account until the next year becomes available and then they'll begin contributing to that year with subsequent transfers.
*You can set up a second automatic transfer to fund a taxable account.
So...it seems as though you can do much of this with Vanguard or eTrade or Ally or Fidelity or other brokerages, but as I understand it, the main difference lies in the automated purchasing of shares and in the fact that they purchase fractional shares of ETFs and that they automatically keep things balanced.
I'll keep looking into the differences but I may test one of them out to explore the functionality...I may also call my current brokerage to see what they say about their options before moving ahead.
Thanks all for your time!