Building your personal allocation

Knowing that asset allocation is the most important decision is step one. Step two is building the one that actually fits your life.

The internet is full of target allocation calculators that ask your age and spit out a number. "You're 58? Go 50/50." These tools aren't useless, but they're incomplete. They ignore your other income sources, your spending flexibility, your emotional wiring, and your actual financial goals. A good allocation is custom, not generic.

The three inputs

1. Time horizon

When do you actually need to spend this money? Not "when do you retire" — when do you start pulling from each specific account?

David Henderson's 401(k) will start funding withdrawals at 65 — seven years away. But Linda's Roth IRA might not be touched until she's 75 or 80, which is 19–24 years from now. Those two accounts have radically different time horizons and should be allocated differently.

Jordan's Roth IRA won't be touched until age 60 — 26 years. But the HYSA and some of the taxable brokerage are earmarked for a home down payment in 5–7 years. Same person, same household, completely different time horizons.

2. Risk capacity

Risk capacity is how much your portfolio can lose without jeopardizing your financial goals. It's an objective measure driven by:

• Income stability — A tenured professor has more risk capacity than a freelance consultant.
• Spending flexibility — Can you cut spending 20% if markets crash? Some households can; some can't.
• Other income sources — Social Security, pensions, and rental income all reduce the amount your portfolio needs to provide.
• Portfolio size relative to needs — Someone with $5M who needs $80K/yr can survive a 50% drop. Someone with $500K who needs $40K/yr cannot.

3. Risk tolerance

Risk tolerance is psychological — how much volatility can you endure without making a destructive decision? This is harder to measure because everyone overestimates their tolerance in a bull market.

The real test is simple: if your portfolio dropped 30% over the next six months, would you:

• A) Rebalance by buying more stocks at lower prices? → High tolerance
• B) Feel uncomfortable but do nothing? → Moderate tolerance
• C) Lose sleep and consider selling? → Low tolerance
• D) Sell everything and move to cash? → Very low tolerance

Your allocation must be set to survive answer C, not answer A. Because during an actual crash, almost everyone shifts one letter toward panic. The person who says "A" in a calm market usually behaves like "B" or "C" when their account is down $400K.

Putting it together

The allocation that works is the intersection of all three inputs:

• Time horizon sets the upper bound on stock exposure. 20+ years → up to 90–100%. Under 5 years → mostly bonds and cash.
• Risk capacity confirms whether you can afford that stock exposure. High capacity means you can hold stocks even if they drop, because you have other resources.
• Risk tolerance may lower the stock allocation below what capacity and horizon allow. If you'd panic-sell during a 40% drawdown, then 90% stocks is wrong even if the math says you can handle it.

The worst portfolio isn't the one with slightly lower expected returns — it's the one you abandon during a crisis.

Allocation across accounts, not within them

Most people think about allocation one account at a time: "My 401(k) should be 60/40, and my IRA should be 60/40." But the right approach is to think of all your accounts as one portfolio and then decide where each asset class lives based on tax efficiency.

Here's the principle: put tax-inefficient assets (bonds, REITs) in tax-advantaged accounts (401(k), IRA). Put tax-efficient assets (index stock funds) in taxable accounts. This is called asset location, and it matters almost as much as allocation itself.

What this means for the Hendersons

David and Linda's aggregate allocation might be 55% stocks / 40% bonds / 5% cash across all four accounts — but the distribution within accounts should differ. David's 401(k) ($620K) holds their bond allocation because bond interest is taxed as ordinary income and the 401(k) defers that tax. Linda's Roth ($180K) holds aggressive equity because growth there is never taxed. The joint brokerage ($450K) holds tax-efficient equity index funds. The HYSA ($150K) is their cash reserve. Same overall allocation, but optimized for where each asset type generates the least tax drag.

What this means for Jordan

Jordan's total allocation might be 85% stocks / 10% bonds / 5% cash — but the home down payment changes the picture. The HYSA ($10K) and a portion of the taxable brokerage should be in short-term bonds or cash, earmarked for the house. The 401(k) ($145K) and Roth ($35K) should be nearly 100% equities because they won't be touched for 26 years. The remaining taxable brokerage goes into tax-efficient equity index funds. Jordan is effectively running two strategies: ultra-aggressive long-term and ultra-conservative short-term, in the same household.

Key takeaways

1. Allocation requires three inputs: time horizon, risk capacity, and risk tolerance. Generic age-based rules ignore two of the three.
2. Risk capacity (objective) and risk tolerance (psychological) are different. Your allocation must respect whichever is lower.
3. The best allocation is one you'll stick with through a bear market. A theoretically optimal portfolio you abandon in a panic is worse than a conservative one you hold.
4. Think across all accounts as a single portfolio, then place assets where they're most tax-efficient.
5. Different goals within the same household can require different allocations — long-term retirement money and short-term home savings should not be invested the same way.

Glossary

• Risk capacity — The objective financial ability to absorb investment losses without jeopardizing your goals. Driven by income, spending flexibility, other income sources, and portfolio size relative to needs.
• Risk tolerance — The psychological ability to endure investment losses without making destructive decisions like panic-selling.
• Asset location — The strategy of placing each asset class in the account type where it generates the least tax drag.
• Tax-advantaged account — An account with special tax treatment, such as a 401(k) (tax-deferred) or Roth IRA (tax-free growth).
• Tax-efficient asset — An investment that generates little taxable income, such as a stock index fund that rarely distributes capital gains.
• Bear market — A decline of 20% or more from a recent peak, typically lasting months to years.