How Much of Your Portfolio Should Be in Stocks?

Close-up of wooden letter blocks spelling 'STOCK' on a table against a blurred green background.

Why Investing in Equities is Important ?

Equities (stocks) have historically provided much higher long term returns than safer assets, making them essential for growth-oriented portfolios. For example, the broad U.S. stock market (S&P 500) returned about 9.8% per year (1928–2023) compared to only ~3.3% for short-term Treasuries over the same period. Over multi decade horizons this gap compounds dramatically. This means $10k invested for 25 years would be $103,528 after 25 years. This in turn means that if you keep on investing $10k every year you will have a huge corpus of $954,300 after 25 years i.e on an total invested value of $250,000. In fact, virtually every 20 year period of S&P 500 history produced a gain, demonstrating that patient stock investors typically profit over a longer period of time. This outperformance is not unique to the U.S. market, other developed markets show similar results. For instance, the Australian market averaged roughly 13% annualized from 1980 -2018. The takeaway is that, over long horizons, equities tend to beat inflation and bonds, making them crucial for retirement or wealth goals. They compound wealth via reinvested dividends and capital gains and they allow investors to participate in economic growth across sectors and regions. Summing it up, the following makes the equities the winner in investment options:

  • Higher long-term returns. Stocks have beaten almost all other assets over the long run. U.S. equities averaged ~9.8% , Europe ~11% and Australia ~13% over a period of 30 years.
  • Compound growth and inflation hedge. Reinvesting dividends means even modest contributions can grow substantially. Broad indexes rarely lose money over decades so equities help preserve purchasing power when held long-term.
  • Diversification and real assets. Stocks represent company ownership across many industries and countries. A globally diversified equity portfolio smooths out country specific slumps. In the current era of higher rates and inflation, value-oriented international stocks may have an edge underscoring the need to diversify beyond any single market.

In short, equities are important because they are the engine of long-term portfolio growth in developed economies. Without them, a retirement portfolio likely lags inflation and misses out on decades of cumulative gains. For example, over 1970–2025 the U.S. market outpaced Europe overall but past outperformance doesn’t guarantee future results emphasizing again that diversification and patience are key while investing in equities.

Is the ‘100‑Minus‑Age’ Rule Still Valid Today?

The traditional 100 minus your age rule which suggests holding a percentage of stocks equal to 100 minus one’s age can be a starting guideline but it has important limitations in today’s context. By this rule a 30 year old would hold 70% in equities, a 70-year-old just 30% etc. But a word of caution that this shortcut is too simplistic. It was devised decades ago when life expectancy was lower and when interest rates were very different. For example, since people today live longer, one might add “10 or 20 years” to the rule. In practice, modern retirees often hold far more in stocks than the rule implies. Vanguard reports that by the end of 2022, people aged 70+ averaged ~42% in equities much higher than the 30% from the 100-age formula. Even target-date retirement funds tend to carry 50–70% in stocks for those near retirement e.g. the Vanguard 2025 Fund (for ~70-year-olds) is about 56% stocks and 44% bonds. These figures suggest that many financial planners believe greater equity exposure is warranted than 100-age would suggest. Several factors explain this shift:

  • Longer retirements and low bond yields.  With retirees often living 20 -30 years past retirement, holding some equities (which outpace inflation) for longer can be prudent. When interest rates were low in the 2010s, bonds yielded very little, so advisors urged heavier stock allocations some even used “110 or 120-minus-age” rules. The same rules remain relevant today as the equities have continuously proven to be safe bet when invested prudently.
  • Personal finances matter. It cannot be further emphasized that the right mix depends on individual needs and not age alone. For example, if Social Security or pensions cover much of your expenses, you can afford more stock risk. In one example, a 70 year old needing $80K/year from $1M savings would fall short with reduced income with a 30/70 split illustrating that rigid age based allocation might be “far more conservative than you need”.
  • Risk tolerance and market conditions. Older investors with high equity risk tolerance & understanding may stay more aggressive, whereas anxious investors might favour bonds. Importantly, recent market moves change the picture, since 2022 interest rates have jumped, pushing bond yields to 4 -5%. Now bonds offer lucrative returns providing an attractive, lower risk income source. In other words, bonds are more appealing now, which may warrant a bit more fixed income or greater investing in fixed assets than 100- age suggests for some retirees.

In summary, 100 minus age in present conditions can be modified to 120 minus age. It’s a rough baseline, but real world conditions imply flexibility. Younger investors may safely target a very high equity share, while those nearing or in retirement should adjust for current yields and personal circumstances. The best practice is to stress test your plan e.g. modelling poor market scenarios and tailor your mix accordingly, rather than blindly following a fixed formula. And the Golden Rule for investing in stocks remains ‘Longer you stay in market, the better the market rewards’.

Three Practical Tips for Equity Investing

  • Diversify broadly. Don’t put all your eggs in one market or sector. Use low-cost index funds or ETFs to cover both U.S. and foreign stocks, and different industries (large-cap, small-cap, technology, healthcare, etc.). History shows leadership among markets shifts over time. For example, Hartford Funds notes that in the new higher-inflation regime, value-oriented international markets may outperform U.S. tech-heavy indices. Moreover, nobody knows which region will lead next, while U.S. stocks have surged recently, earlier decades saw European stocks winning out. A globally diversified equity mix smooths out these cycles. In practice, consider holding something like a U.S. total market fund plus an international/global stock fund (or respective ETFs). This way, you capture growth wherever it occurs and reduce risk from a single economy.
  • Stay the course and rebalance. Equity investing is a long-term game. Commit to regular contributions e.g. automatic monthly purchases and avoid trying to time short-term market moves. Investors often hurt returns by panic-selling during drops and chasing rallies later. Darbar’s analysis found that over 30 years the average equity investor earned only ~6.8% annually, far below the S&P 500’s ~9.7%, largely due to market timing mistakes. In contrast, a simple buy and hold strategy yields much better outcomes as noted, 20 year holds were almost always profitable. To manage risk, set an equity target (e.g. 60% stocks) and rebalance once a year or so: if stocks have run up and exceed your target, trim back to bonds or cash (locking in gains); if stocks have fallen, buy more at cheaper prices. Rebalancing enforces “sell high, buy low” and keeps your allocation on track with your risk tolerance. As one illustration, a 60/40 stock/bond portfolio earned about 7.9% per year over 2014-2024, thanks to diversified asset contributions and regular rebalancing thus surpassing the bond yield.
  • Focus on valuation and quality. Pay attention to market conditions and company fundamentals. In periods of high inflation and rising rates certain stocks tend to fare better. Research shows that value stocks (established companies with steady earnings) generally outperform growth stocks in inflationary times. Thus, you might tilt toward dividend paying or value tilted funds or defensive sectors like consumer staples and utilities that historically weather downturns. Keep fees low by favoring index or factor ETFs over expensive active funds. Also consider tax efficiency, use retirement accounts (401(k), IRA) for equity gains when possible. Finally, don’t be swayed by daily news  focus on fundamentals like profit growth and reasonable price multiples. If market valuations seem elevated, resist chasing. Experienced investors often hold some cash on the side-lines to buy bargains during corrections. The key is to be patient, over decades the market rises with the economy, so a disciplined, long-term approach usually rewards, especially when complemented by sensible diversification and valuation awareness.

By following these principles i.e. broad diversification, long term discipline, and smart stock selection a Smart investor can structure an equity allocation that harnesses the growth potential of stocks while managing risk. There is no one size fits all percentage, but combining historical insight with personal goals and current market context will lead to an informed allocation.