The Permanent Portfolio Review: Harry Browne's 4-Asset Strategy, Backtested Since 1970

During the 2007–2009 financial crisis, the Permanent Portfolio returned +6.78% annualized. The standard US 60/40 returned -0.42% annualized over the same period. That contrast isn't a fluke. It's the strategy working exactly as Harry Browne intended when he designed it in 1981.

Browne's premise was deceptively simple: hold four assets in equal 25% allocations — US stocks, long-term Treasury bonds, gold, and cash — because each one thrives in a different economic environment. Stocks perform in prosperity. Long bonds perform in deflation. Gold performs in inflation. Cash cushions recessions. If you own all four, at least one asset is always in its ideal condition, which means the portfolio as a whole rarely experiences a complete collapse.

More than 50 years of backtested data now exist to test that theory.

The Long-Term Numbers

From 1970 through the most recent data, the Permanent Portfolio produced a CAGR of 8.69%. The US 60/40 Portfolio produced 9.50% over the same period.

That 0.81 percentage point gap is real, and over 50 years of compounding it adds up to a meaningful difference in ending wealth. The Permanent Portfolio does give up long-run return.

What it gives back: the max drawdown for the 60/40 was -29.68%. For the Permanent Portfolio, -15.52%. The worst single calendar year for the 60/40 was -18.25%. For the Permanent Portfolio, -11.92%. For an investor who can stay fully invested through a -15% drawdown but would panic-sell during a -29% one, the lower return is not actually a trade-off. It's a prerequisite for participating in any return at all.

For a more recent comparison, the 2022 peak-to-trough drawdown for the S&P 500 was about -25%. A 60/40 portfolio didn't fully shield investors from that pain and its all-time max drawdown of -29.68% shows why some investors want a strategy with a lower ceiling on losses.

How It Handled the Two Worst Crashes

The most revealing performance data for any portfolio is not its average year. It's what happened during the two sustained crashes of the last 25 years.

During the dot-com collapse, long bonds and gold both rose as equities fell. During 2007–2009, Treasuries surged as investors fled to safety, more than offsetting losses elsewhere in the portfolio. The Permanent Portfolio was positive during both multi-year crises. The 60/40 was negative during both.

This pattern also held in the early 2000s dot-com era, where the 60/40's -4.26% annualized CAGR reflects a sustained three-year grind lower for equity investors. A 25% gold and 25% bond cushion made those years survivable rather than catastrophic.

The caveat is worth naming: the Permanent Portfolio has historically struggled in environments where stocks, bonds, and gold all sell off simultaneously. Periods in the early 1980s and parts of the 2010s were rough. The 25% cash allocation is a long-term drag, and the 25% gold allocation frustrates equity-focused investors during the years when gold goes nowhere.

The Floor That Matters Most

For investors within 10 to 15 years of retirement, or already in it, the most relevant statistic is not the average return. It's the worst 10-year period they could realistically experience.

The Permanent Portfolio's rolling 10-year low is 3.38% annualized. Even its worst decade produced a small positive real return. The US 60/40's rolling 10-year low is 0.91%. That's barely above flat for ten years — a realistic outcome for someone who retired near a market peak.

The Golden Butterfly Portfolio, which is a spiritual successor that adds small-cap value equity to Browne's formula, has a rolling 10-year low of 4.37% — a point higher than the Permanent Portfolio's 3.38% floor. Over the most recent 10 years its CAGR was 8.16% versus the Permanent Portfolio's 7.74%. The trade-off: a slightly deeper max drawdown of -18.01% compared to -15.52%, and a lower full-backtest CAGR of 8.12% versus 8.69% over the full period since 1970.

For the 60/40, this is where sequence-of-returns risk in retirement becomes a real concern. Experiencing a 10-year CAGR of 0.91% right out of the gate in retirement could lead to some lean years at the back end of retirement. The Monte Carlo Simulator can be used to model what that might look like.

Risk-Adjusted Returns

When you compare return relative to the volatility required to earn it, the Permanent Portfolio is more efficient than it looks on CAGR alone. Its Sharpe ratio of 0.56 beats the 60/40's 0.51. The Ulcer Index, which captures both the depth and duration of drawdowns rather than just the worst single point, is 3.02 for the Permanent Portfolio and 6.03 for the 60/40. The 60/40 delivers higher nominal returns, but the path is twice as painful by this measure.

For investors who track the Ulcer Performance Index, which uses Ulcer Index as the denominator in place of standard deviation, the Permanent Portfolio scores 1.39 versus the 60/40's 0.83. The Permanent Portfolio is doing more work per unit of investor discomfort.

Who This Strategy Is Built For

The Permanent Portfolio is not a growth vehicle. It is a preservation vehicle with a respectable long-run return attached. Three investor profiles are genuinely well-matched for it.

Investors approaching or in retirement, where a large drawdown in year one of withdrawals creates a sequence-of-returns problem that higher returns in later years cannot fully fix. The Permanent Portfolio's -15.52% max drawdown reduces this risk structurally.

Investors who have genuinely tested their drawdown tolerance and found they struggle to hold through 20%+ declines. The Permanent Portfolio's shallow worst-case loss makes staying the course easier for a specific type of investor temperament.

Investors with a 10 to 20 year horizon where the 60/40's long-run CAGR advantage is less relevant than the floor return during a potentially bad sequence of years.

If the Permanent Portfolio's stability appeals but you want slightly better growth potential, the Golden Butterfly Portfolio is the natural next step. Both sit within the all-weather strategy family, which prioritizes surviving every economic environment over maximizing any single one.

If you want to screen for portfolios by drawdown tolerance or rolling return floors, the Portfolio Screener lets you set minimum thresholds for both and filter the full database of 70+ strategies.

The Permanent Portfolio gives up roughly 0.81 percentage points of annual return versus a standard 60/40 to cut its worst drawdown nearly in half. Whether that trade-off makes sense depends entirely on how you would actually behave during the drawdown — not how you think you would.