In a post a couple weeks back, I asked readers their thoughts (and provided my own) on asset allocation, specifically:
- At what point should you begin shifting your allocation away from stocks? and
- How gradually or suddenly should you do so?
In the comments, Neal brought up the fact that in the article I was making the (unstated) assumption that a person’s investments were intended exclusively for retirement, when clearly that’s not always the case.
So today the question is: What should a person’s asset allocation look like when the investment portfolio is intended to pay for a specific cash outlay at a known time in the future? (Example: A 529 plan intended to pay for college in X years.)
What guideline could an investor use as a starting point (which then, of course, must be adjusted for personal factors such as volatility tolerance)?
My own thoughts
My own attempt at a generalized guideline (for a cash outlay X years from now) would be something to the effect of:
Stock allocation = 4x – 10 (with all negative values considered to be zero, and possibly with a cap at, say, 90%), thereby yielding the following allocations:
- 1 year: 0% stocks
- 5 years: 10% stocks
- 10 years: 30% stocks
- 20 years: 70% stocks
- 30 years: 90% stocks
Thoughts from the Bogleheads & David Swenson
I asked over on the Boglehead forums for their thoughts on the matter. One of the replies brought up the method suggested by David Swenson (in his book as well as in this interview), which is essentially to have two separate portfolios:
- A long-term portfolio, in which you maintain an (unchanging) equity-oriented asset allocation, and
- An extremely low-risk portfolio, such as a money market or online savings account, possibly with some TIPS thrown in.
And, as the date of the expenditure draws nearer, simply shift money from the first portfolio toward the second. This would provide an asset allocation as follows:
- More than 8 years from expenditure: 70% stocks, 30% bonds
- 6-8 years: 52.5% stocks, 22.5% bonds, 25% cash
- 4-5 years: 35% stocks, 15% bonds, 50% cash
- 2-3 years: 17.5% stocks, 7.5% bonds, 75% cash
- Less than 2 years: 100% cash
What do you think?
What guidelines would you use as a starting point for consideration when developing an asset allocation (and glide path) for a portfolio that’s intended for a specific expenditure in the future?












