I am currently struggling to resolve a trade-off I perceive between proper asset location and my desire to maintain the same expected return in both my taxable and Roth accounts. To illustrate the key issue here is an example:
I'm 29 (this is my true age). Lets say I have $25K with half in a Roth IRA and half in a regular taxable account. Assume I dont' have access to a 401K, and that my universe is only these two accounts. Let's say I invest as follows: 20% bonds and 80% stocks with 70/30 split between US and Int'l equity.
Boglehead asset allocation would dictate my investments to be as follows:
Roth IRA: $5K Total Bond Mkt (VBMFX) + $7.5K Total US Stock (VTSMX)
Taxable Account: $6K Total Int'l Stock (VGTSX) + 6.5K Total US Stock (VTSMX)
But here is my issue: The expected return of my taxable account (all equities in this case), is much higher than the expected return of my Roth account (some bonds). Thus, my taxable account would likely grow much faster than my Roth account, and this is the opposite of what I want to happen (for obvious reasons)!
In an effort to push my Roth account back up the risk/return spectrum (so that it will match the risk/return of my taxable account), would it be crazy to pair my bond holdings with small & mid-cap equities? Then large-cap equities would be concentrated in my taxable account. The portfolio might look something like this:
Roth IRA: $5K Total Bond Mkt (VBMFX) + $3.5K Vanguard S&P 500 (VFINX) + $4K Vanguard Extended Market (VEXMX)
Taxable Account: $6K Total Int'l Stock (VGTSX) + $6.5K Vanguard S&P 500 (VFINX)
Remember the goal is to choose investments so that my taxable account doesn't grow faster than my Roth account. Stated differently, I am trying to adhere to Boglehead asset location (tax efficiency) guidelines, while also keeping the expected risk and return of each account equal.
I think it's important that my Roth account keep pace with the growth of my taxable account because I have a long investment horizon in front of me. Would you ever do this in my shoes? If not, what am I missing?
Thank you in advance for your thoughts!


