The 3-Fund Portfolio: Start Simple, Results Aren’t Simple

As of August 2025, there are more than 2,000 mutual fund products registered with OJK (Indonesia’s Financial Services Authority) with total AUM of Rp550 trillion.¹ Many beginners immediately feel overwhelmed — too many choices, too many strategies, too many “recommendations” from influencers.

But you don’t need all that.

With just three mutual funds, you can build a portfolio that’s diversified, low-cost, and proven effective for long-term accumulation. This concept is known as the three-fund portfolio — a passive investing strategy popularized by the Bogleheads community, followers of John Bogle’s philosophy, the founder of Vanguard.²

The Three Components and Their Functions

With these three products, you already have exposure to:

• Indonesia’s largest stocks through the IDX30/LQ45 index
• Government bonds which are the safest instruments in Indonesia
• Liquidity for emergency needs

No need for hundreds of products. No stock picking. No market timing.

Why Simpler Is Better

Low cost = higher returns

Every mutual fund charges an expense ratio — an annual fee that directly reduces your returns. With only 3 products (especially passive index funds), your total costs can be below 1% per year.

Compare that to a portfolio of 10-15 actively managed funds that can incur 1.5-2.5% per year in fees. Over 30 years, a 1% expense ratio difference alone can reduce your final portfolio value by 25-30% — not a small number.

To understand how fees impact returns, read Mutual Fund Expense Ratios.

Diversification is already sufficient

An IDX30 index fund gives you exposure to the 30 largest and most liquid companies on the Indonesian exchange. Adding 10 more funds often just creates overlap — different products but holding the same stocks.

Easy to manage

With 3 products, rebalancing becomes simple. Once a year, check your allocation. If it’s off, adjust with your next monthly contribution. No need to monitor a dozen products or figure out which investment manager is performing well this year.

Example Products for Each Component

1. Equity Index Fund (Choose One)

• BNI-AM Indeks IDX30 (expense ratio ~0.54%)
• Avrist IDX30 (expense ratio ~0.64%)
• Simas IDX30 (expense ratio ~0.75%)

Choose the one with the lowest expense ratio. For a complete comparison, read Index Fund Comparison.

2. Fixed Income Fund (Choose One)

• Sucorinvest Stable Fund
• Mandiri Investa Dana Utama
• Bahana Dana Pendapatan Tetap Syariah (for a sharia option)

Choose one where most of the portfolio is in government bonds (SBN) — safer than those dominated by corporate bonds.

3. Money Market Fund (Choose One)

• Sucorinvest Money Market Fund
• Bahana Dana Likuid
• Mandiri Pasar Uang

Money market returns are generally equal to or slightly above deposits (4-5%/year), but far more liquid — can be withdrawn anytime without penalty.

Allocation Based on Age and Horizon

The ideal allocation depends on when you’ll need the money. General guidelines:

For a complete guide on determining the right proportions for your situation, read Asset Allocation.

Example: Starting with Rp1 Million per Month

You’re 28 years old, just starting to invest. 70/20/10 allocation:

• Rp700,000 → equity index fund
• Rp200,000 → fixed income fund
• Rp100,000 → money market fund

Set up auto-debit on platforms like Bibit, Bareksa, or IPOT. Don’t rely on manual discipline — automatic is more effective.

With consistent Rp1 million/month contributions and an assumed average return of 9%/year, in 25 years your portfolio could potentially reach around Rp1.1 billion — from total deposits of only Rp300 million. The rest is compound interest.

When Do You Need More Than 3 Funds?

The 3-fund portfolio is sufficient for 90% of investors. You might need to add products if:

• Your portfolio is already large (>Rp500 million) and you want to diversify into gold, property, or direct retail government bonds
• You need international exposure (not many options in Indonesia yet, but global ETFs are starting to become available)
• You have separate short-term goals (e.g., house down payment in 3 years — keep that portfolio separate)

But for beginners? Start with 3. Don’t delay investing because you’re still “looking for the perfect product.”

Mistakes to Avoid

Too many products. Having 15 mutual funds doesn’t mean you’re diversified. They probably overlap — 5 equity funds that all invest in the same banks and consumer goods companies.

Chasing performance. The fund with the highest return last year isn’t necessarily good this year. SPIVA data consistently shows the majority of actively managed funds underperform their index over the long term.³

Panic-selling when markets drop. If you can’t sleep well when your portfolio drops 20%, your stock allocation is too high. Adjust — don’t sell.

Start Today

The 3-fund portfolio isn’t just for beginners. Its simplicity is what makes it powerful — fewer decisions means fewer mistakes.

What you need:

1. Determine allocation based on age and risk tolerance
2. Choose one product for each component (index, bonds, money market)
3. Set up monthly auto-debit
4. Rebalance once a year
5. Be patient

Not glamorous. Not exciting. But effective.

Disclaimer: This article is for educational purposes only, not a product recommendation. Do your own research before investing.

References

• OJK Mutual Fund Statistics — Press Release August 2025 (OJK, 2025) — Indonesian mutual fund AUM and NAV data
• Three-fund portfolio (Bogleheads Wiki, 2026) — original three-fund portfolio concept
• SPIVA Scorecard (S&P Global, 2025) — performance comparison data for active funds vs index