Asset Allocation for FIRE
Asset allocation — the split between stocks and bonds — is the single biggest determinant of long-term returns and risk. A common FIRE rule is 100 minus your age in stocks, though many early retirees choose 70-90% stocks because their longer time horizon lets them ride out downturns. A 70/30 stocks-to-bonds portfolio with 10% international is a reasonable starting point for most FIRE investors.
Why Asset Allocation Matters More Than Anything Else
Your asset allocation determines what fraction of your portfolio rides the stock market's long-term growth and how much it drops in a crash. Over 30-50 years, that split explains most of the difference between portfolios — more than fund selection, more than market timing, more than most other decisions combined.
Stocks have historically returned about 7% after inflation over long periods; bonds roughly 2-3%. But stocks can fall 30-50% in a bear market, while bonds cushion the drop. The trade-off between growth and stability is the entire asset allocation question.
Because the difference compounds, a 90/10 stock-heavy portfolio can end up with nearly twice the money of a 40/60 portfolio after 30 years — while also being twice as painful to hold during a crash. There's no free lunch, only choices.
The Building Blocks: Stocks and Bonds
Stocks (equities) are ownership in companies. They provide growth, dividends, and long-term inflation protection, but they're volatile — historically down about once every four years on average.
Bonds are loans to governments and corporations. They pay interest, hold value better in downturns, and reduce portfolio volatility, but their real return is lower over the long run.
Most FIRE portfolios also hold a slice of international stocks — commonly 20-40% of the stock allocation — because global diversification reduces single-country risk with only a modest cost in complexity. The 'stocks plus bonds plus international' structure is exactly what the three-fund portfolio implements.
Rules of Thumb: 100 Minus Age and Beyond
The classic rule is stocks = 100 minus your age: at 30, 70% stocks; at 50, 50%. The idea is that you can afford more risk when young and need less as you approach retirement.
Variants use 110 minus your age (because retirements last longer now) or 120 minus age. Others suggest a flat '120 minus age, capped at 80% stocks.'
These are starting points, not rules. Your personal number depends on your time horizon, your actual risk tolerance (not your imagined one), and whether you have other income sources like a pension. The most useful question isn't 'what's the formula?' but 'what's the largest loss I can sit through without selling?'
How FIRE Changes the Equation
Early retirement makes the stock allocation question subtly different from a traditional retirement.
First, your time horizon is longer. Retiring at 45 means 40-50 years of withdrawals, and a longer horizon historically favors stocks — more time to recover from crashes. Second, sequence-of-returns risk is the killer: a market crash in the first few years of withdrawals can permanently damage the portfolio. Bonds mitigate that. Third, you may need to fund 20 years before Social Security and pensions arrive, which is more years of relying on the portfolio.
The balance most planners land on: keep stocks high early in the accumulation phase, then glide to a more conservative allocation around retirement — but not as conservative as traditional retirees, because the retirement lasts longer.
Sample Allocations by Time to FIRE
These are reasonable starting allocations to adapt:
10+ years to FIRE (accumulation): 80% stocks / 20% bonds — ride growth, tolerate volatility.
3-10 years to FIRE (glide): 70% stocks / 30% bonds — start protecting what you've built.
At retirement / withdrawing: 60-70% stocks / 30-40% bonds — enough growth for a 40-year retirement, enough bonds to dampen sequence-of-returns risk.
Early in retirement some FIRE practitioners add a cash buffer (1-3 years of expenses in cash or short-term bonds) to avoid selling stocks during a downturn. Within the stock portion, allocating 20-40% to international is the common choice.
Implementation and Rebalancing
Implement your allocation with broad index funds — total US stock, total international stock, total bond — at near-zero cost. Decide your target percentages, then buy them in proportion when you invest.
Rebalance once a year by directing new contributions to whichever fund is below target. That's usually enough to keep drift in check without selling anything or triggering taxes.
Set it, automate it, and resist the urge to change it based on headlines. Use the FIRE Calculator and Net Worth Projection to see how different allocations change your projected balance, and remember the asset allocation you can hold through a crash is the right one for you.
Frequently Asked Questions
What is a good asset allocation for FIRE?
A common starting point is 70% stocks / 30% bonds, with 20-40% of the stock portion in international. Investors 10+ years from retirement often use 80/20; near or at retirement, 60-70/30-40 is more common. The right number depends on your time horizon and how much of a drawdown you can tolerate without selling.
How much should I have in stocks vs bonds?
Use a rule of thumb as a starting point, then adjust for your situation. 100 minus your age is the classic formula; many FIRE investors prefer 110 or 120 minus age because their retirements last longer. If you can't sleep through a 30-40% stock drawdown, you have too many stocks regardless of the formula.
Is the 100 minus age rule still valid?
It's a useful starting point but conservative for modern retirement. Life expectancy is longer, so many advisors suggest 110 or 120 minus age. For FIRE specifically, the longer early-retirement horizon often justifies holding more stocks than the classic formula suggests — with enough bonds to survive sequence-of-returns risk in early withdrawal years.
When should I become more conservative?
The main trigger is approaching your withdrawal start date, not your calendar age. In the 5-10 years before FIRE, glide your stock allocation down (for example from 80% to 60-70%) to reduce the risk that a crash right before retirement derails your plan. After retirement, keep enough growth for a 40-year horizon but use bonds and a cash buffer to avoid selling stocks during downturns.