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Bogleheads' 10 Investment Philosophies ​

"Don't look for the needle in the haystack. Just buy the haystack!" — John C. Bogle

I encountered John Bogle's philosophy amidst the massive market volatility of 2021, and have steadfastly practiced it ever since.

The Bogleheads philosophy grew from the principles of John Bogle, who founded Vanguard and helped bring low-cost index mutual funds to individual investors. It emphasizes broad-market funds, lower avoidable costs and taxes, and a consistent long-term asset-allocation plan.

My Journey: A Record Since 2021 ​

Experiencing the stock market overheating in 2021 followed by a bear market, I realized how futile individual stock picking and market timing really are. After discovering the Bogleheads philosophy, I abandoned my habit of anxiously checking charts every day and equipped myself with a clear system of "asset allocation and systematic index investing."

Below are my own principles of practice, blending the 10 teachings of Bogleheads and localizing them to fit the Korean market investor's perspective (tax-advantaged accounts, domestically listed ETFs, etc.).

Source and scope

The source principles are checked against Bogleheads Getting started. The Korean account, KCA, and core-satellite interpretations in this article are my personal adaptations, not official recommendations from the Bogleheads community.

The 10 Bogleheads Principles and the Korean Practice Guide ​

1. Develop a workable plan ​

Successful investing begins with drafting a robust Investment Policy Statement (IPS) that won't be swayed by emotions. The specific 5-step investment planning guide recommended by Bogleheads (Education, Planning, Asset Allocation, Portfolio, Priorities) is detailed in a separate document below.

👉 View Investment Planning Guide

2. Invest early and often ​

The essence of this principle lies in maximizing the magic of compounding over time (Early), and eliminating short-term market volatility and the temptation of timing (Often).

  • Maximizing time and compounding (Early): The most powerful weapon in investing is not intelligence, but time. You must start as early as possible to secure the runway (duration) for compound interest to work exponentially.
  • Daily KCA practice (A modern application of Often): Moving beyond investing once a month, I divide the monthly amount across days and use a KCA (KRW Cost Averaging) system to buy a fixed KRW amount mechanically. Spreading purchases across several days can reduce reliance on a single monthly entry point, but it does not remove price or currency risk. Its purpose is to make investing a repeatable saving habit.

3. Never bear too much or too little risk ​

Relying 100% solely on safe assets and index funds might protect your wealth, but it can be a state of 'Too little risk' that fails to maximize returns. We employ a Core-Satellite strategy to simultaneously pursue portfolio stability and explosive growth.

  • The gravity of the Core and the swing-by of the Satellite: At the center of the portfolio, we heavily place 'planetary assets (index funds)' that are never sold, creating the gravity of compounding. We then launch a small portion of 'satellite assets (innovative individual growth stocks, sectors)' into the orbit of trends to gain explosive acceleration (alpha returns).
  • The virtuous cycle of risk: The profits earned by the satellite are sold (swing-by escape) and injected back into the planet to increase the mass of the core. This kind of appropriate risk-taking, betting on controlled innovation (satellites), maximizes the growth of total assets.

4. Diversify ​

"Don't look for the needle, buy the haystack." To reduce the company-specific risk of a concentrated portfolio, I use broad market indices as Core assets. This does not remove the risk of a market-wide decline.

  • The core universe I chose: I classify concentrated indices such as the NASDAQ or semiconductor funds as satellites and use the broadly diversified U.S. large-cap S&P 500 as my core. This is a personal choice, with less geographic diversification than a total-world index.
  • Diversification in Non-US markets (Applying the 3-Fund Portfolio): I balance diversification by filling the Non-US (International) equity allocation recommended by the Bogleheads 3-Fund Portfolio with the KOSPI 200 index, the Korean market I understand best. However, I strictly exclude the highly volatile and thematic KOSDAQ market from my investments to protect the stability of the core assets.

5. Never try to time the market ​

Most people only worry about when to 'enter' the market, but the most fatal mistake in investing occurs when 'leaving' the market.

  • Never leave the market: John Bogle warned us to "Stay the course" under any circumstances. If you sell stocks out of fear of a downturn or judging it a short-term peak, timing your 'second entry' back into the market is the domain of gods.
  • The trap of psychological barriers to entry: If the stock price rises above the price at which you sold, your 'selling price' becomes anchored, and buying back at a more expensive price is an agonizing pain. Ultimately, you end up just watching the rising market and remain forever alienated from the compounding bull market.
  • The solution is staying forever (Daily KCA): We must abandon the arrogance of trying to predict economic indicators to escape. The tool to control this is daily KCA (mechanical periodic accumulation). By buying a stake in the market every day, we eliminate the temptation of timing and stay in the market forever.

6. Use index funds when possible ​

SPIVA scorecards show that, after fees, many active funds in multiple categories have underperformed their benchmarks over long periods. Results vary by market, period, and fund type, and some funds do outperform.

  • Pure index as a Core asset: Sector investments like NASDAQ or semiconductors involve 'the act of humans trying to predict the future of a specific industry', so they cannot be core assets. The backbone of the portfolio must be pure market indices (S&P 500, KOSPI 200) with 0% of a fund manager's subjectivity involved.
  • Acceptance of mechanical Quant-based indices: However, I trust funds like SCHD (Dividend Growth Quality) or SPMO (Momentum). This is because they are another form of index that includes and excludes stocks strictly based on 'transparent, mechanical mathematical rules (Rule-based)' without any room for a manager's prediction to intervene.
  • Excluding sector satellites and leverage: Semiconductor ETFs (like SOXX) are only utilized as small-weighted satellite assets when they appear as a promising trend. However, leverage products (like SOXL), the enemies of long-term compounding, are strictly excluded.

7. Keep costs low ​

In long-term compound investing, management fees and trading costs are a cancer that enormously eats away at asset size over time.

  • Check hidden costs (TER & Securities transaction costs): Do not simply trust the superficial 'management fee' shown in the ETF product prospectus. The actual cost borne by the investor is the Total Expense Ratio (TER), which sums up [Base fee + Other expenses + Lending/Trading brokerage commissions].
  • Utilize KOFIA disclosures: US index ETFs listed in Korea have lowered their superficial fees due to competition among asset management companies, but their 'other expenses' are often high. Be sure to periodically check the 'Korea Financial Investment Association (KOFIA) Electronic Disclosure Service (Actual fee rate including other expenses and underlying fund fees)' and select the product (TIGER, ACE, SOL, KODEX, etc.) with the lowest actual total expense ratio among ETFs tracking the same index.

8. Minimize taxes ★★★ ​

Taxes are one factor—alongside costs, returns, and holding period—that affects an investor's realized result. Korean investors should compare the benefits and restrictions of tax-advantaged accounts under current rules and personal circumstances.

  1. ISA (Individual Savings Account) - For early investing and short-to-medium term funds:
    • Benefits: After offsetting profits and losses, net profit is tax-exempt up to 2 million won for the standard type (4 million won for the low-income type), and any excess is taxed separately at 9.9% (more advantageous than the general financial income tax of 15.4%).
    • Application: Since direct investment in overseas stocks incurs a 22% capital gains tax, managing domestically listed US index ETFs (S&P 500, NASDAQ 100, etc.) in an ISA account dramatically saves taxes.
    • Tip: If you cancel at the 3-year maturity and transfer the matured funds to a Pension Savings/IRP account, you can receive an additional tax credit for 10% of the transferred amount (up to 300,000 won).
  2. Pension Savings Fund - A long-term retirement account:
    • Benefits: You receive a tax credit of 13.2% (if total salary exceeds 55 million won) or 16.5% (if 55 million won or less) up to a maximum limit of 6 million won of your annual contribution. During the investment period, dividend income tax (15.4%) is not imposed and taxation is deferred, and when receiving the pension after age 55, you only pay a low pension income tax of 3.3%~5.5%.
    • Application: Since 100% risky asset (equity ETF) investment is possible, fully pack US S&P 500 and NASDAQ 100 index ETFs to maximize compounding and manage them as long-term systematic investments.
  3. IRP (Individual Retirement Pension) - Maximizing the tax credit limit:
    • Benefits: You can expand the tax credit benefit to a combined maximum of 9 million won annually, including pension savings contributions. (An additional 3 million won can be contributed once the 6 million won pension savings limit is met).
    • Restrictions and forced asset allocation: Under the Employee Retirement Benefit Security Act, at least 30% of the account balance must be filled with 'safe assets' (bond ETFs, deposits, TDFs, etc.). Actively utilize this as a means of risk management and portfolio diversification, aiming for 70% equities + 30% safe assets.

9. Invest with simplicity ​

The diversification of investment targets is different from the investment becoming complex. No matter how many stocks are in a portfolio, the underlying philosophy and execution system must be exceedingly simple.

  • My 3 Core (Planet) Buckets: Even if I hold dozens of ETFs, they are managed in my mind in just 3 simple buckets.
    1. Market Indices tracking global capitalist growth (VOO, VTI, VXUS, etc.)
    2. Smart Beta accumulating excess returns through mechanical quant rules (SCHD, SPMO, etc.)
    3. Safe/Defensive Assets maintaining gravity during crises (US long-term bonds, gold, etc.)
  • Simplification of Execution: Even with such an elaborately designed multi-asset portfolio, I do not hold the steering wheel (management) complexly. Instead of looking at daily market conditions and adjusting the weight of individual stocks, I maintain the ultimate simplicity of mechanically buying through the aforementioned 'Daily KCA system' and rebalancing only once every 6 months to 1 year according to set rules.

10. Stay the course ★★★★★ ​

This is the alpha and omega of John Bogle's philosophy, and the final glue that completes the preceding 9 principles into a single investment system. No matter how perfectly you set up your IPS (No. 1) and lower costs and taxes (No. 7, 8), if you derail halfway, everything becomes useless.

  • Commitment to carry through all principles: 'Stay the course' is not a magical secret, but a solemn behavioral oath to oneself that the rules 1 to 9 set earlier will never be changed, come rain or shine.
  • A view of history and human progress: Broad equity markets recovered after episodes such as the dot-com bubble, the financial crisis, and the pandemic, but recovery times differed and some countries and companies did not recover. Staying the course is my decision to accept that uncertainty while investing in long-term productivity growth.
  • Physical Blocking (The Action of Inaction): If psychology is difficult to manage, the physical environment can be adjusted. After defining my daily KCA plan and core-satellite rules, I turn off brokerage-app notifications, reduce unnecessary logins, and focus on work and daily life. This is one behavioral guideline I use to practice 'Stay the course.'
📝 Practical resolve since 2021:
When stock prices fall, I consider it a "bargain sale period to buy excellent assets cheaply" and never stop systematic buying. When stock prices surge, I don't get blinded by greed and chase the rally unreasonably. I only move forward trusting the system (periodic accumulation and rebalancing).

These are two masterpieces that form the backbone of the Bogleheads philosophy and that I love most in my investment journey. Click the links below to check out detailed notes from my reading.