Money Market Funds vs Time Deposits: Which Is More Profitable?

Money market funds (RDPU/Reksa Dana Pasar Uang) and time deposits are two instruments often compared because of similar characteristics: low-to-moderate returns, low risk, and suitable for short-term goals.

But which is better?

Spoiler: There is no “universally better” option. There’s only what’s more suitable for your situation. This article will help you choose by comparing both instruments from various aspects — including concrete return simulations with actual Rupiah figures.

Quick Comparison Table

Key insight: With the same gross return, RDPU yields 20-25% more after taxes.

Part 1: What Is a Money Market Fund?

A money market fund is a type of mutual fund where the entire portfolio is placed in money market instruments — debt instruments with maturities of less than 1 year.

1.1 RDPU Portfolio Contents

1.2 RDPU Characteristics

• NAV almost always rises — because the portfolio contains instruments that provide fixed interest/coupons
• Very low fluctuation — historically, monthly RDPU returns are rarely negative
• Liquid — can be withdrawn anytime, funds arrive in 1-7 business days
• Tax-free — gains from sales are not subject to income tax

1.3 Popular RDPU Product Examples

*Historical return as of early 2026. Past returns don’t guarantee future returns.

Part 2: What Is a Time Deposit?

A time deposit is a bank savings product with a fixed interest rate and specific term (tenor). Unlike regular savings accounts, deposits cannot be withdrawn before maturity without penalty.

2.1 Types of Deposits

2.2 Deposit Characteristics

• Fixed interest — determined upfront, doesn’t change during tenor
• Locked — cannot be withdrawn before maturity (or faces penalty)
• LPS guaranteed — up to Rp 2 billion per customer per bank
• 20% tax — final income tax on deposit interest

2.3 Major Bank Deposit Interest Rates (2026)

*Interest rates as of early 2026. Subject to change.

Note: Digital banks generally offer higher rates due to lower operating costs.

Part 3: After-Tax Return Comparison

This is where the most significant difference lies: taxes.

3.1 RDPU vs Deposit Tax

3.2 Simulation with Same Gross Return

Let’s say both offer 5% gross return per year:

Difference: Rp 1,000,000 or 25% more in RDPU.

3.3 Concrete Simulation: Rp 10 Million, 50 Million, 100 Million

Assumptions:

• RDPU: 4.8%/year gross return
• Deposit: 4.5%/year gross return (digital bank average)
• Tenor: 1 year

Simulation Rp 10 Million

Simulation Rp 50 Million

Simulation Rp 100 Million

3.4 Difference Over 5 Years (Compound)

What if Rp 100 million is left for 5 years?

Over 5 years, RDPU generates Rp 7 million more just from tax efficiency.

Part 4: Liquidity Comparison

4.1 Withdrawal Speed

4.2 Deposit Early Withdrawal Penalty

If you withdraw a deposit before maturity:

• Accrued interest may be forfeited (not paid)
• Interest already paid may be deducted from principal
• Administrative fees at some banks

Example:

• Rp 50 million deposit, 6-month tenor, 4.5%/year interest
• Withdrawn at month 3
• Potential loss: 3 months interest = Rp 562,500 (before tax)

4.3 When Is Liquidity Important?

Part 5: Safety Comparison

5.1 LPS Guarantee vs Diversification

5.2 Real Risks

Deposit:

• If bank fails and funds > Rp 2 billion: potential loss
• If bank fails and funds < Rp 2 billion: 100% LPS guaranteed
• Historical risk: very low for major banks (BCA, Mandiri, BRI, BNI)

RDPU:

• If investment manager fails: funds remain safe because there’s a custodian bank
• NAV decline risk: very low, almost never negative annually
• Underlying default risk: diversified, so impact is minimal

5.3 When Is LPS Guarantee Important?

Irony: For large funds (> Rp 2 billion), RDPU is actually safer than deposits because it’s not concentrated in one bank.

Part 6: When to Choose RDPU?

RDPU is the better choice if:

6.1 Emergency Fund

Emergency funds need instruments that are:

• ✅ Stable (shouldn’t decline)
• ✅ Liquid (can be withdrawn anytime)
• ✅ Returns > inflation

RDPU meets all criteria and is tax-free. Keep 1-2 months of expenses in a savings account for ultra-emergency needs, the rest in RDPU.

6.2 Temporary Cash Parking

Waiting for the right time to buy a house, car, or other investment? RDPU is an ideal “parking” spot:

• Not locked like deposits
• Higher returns than savings accounts
• Can be withdrawn in days

6.3 Short-Term Education Fund

If your child is entering college in 1-2 years, RDPU is more suitable than equity funds (too volatile) or deposits (high tax).

6.4 Funds > Rp 2 Billion

If you have large funds exceeding the LPS guarantee limit, RDPU is safer because it’s diversified across various instruments and banks.

Part 7: When to Choose Deposits?

Deposits are the better choice if:

7.1 You Need a Psychological “Lock”

For some people, RDPU’s easy withdrawal is actually a problem — too easy to spend. Deposits that are “locked” provide saving discipline.

7.2 You’re Very Conservative and Need Guarantees

If peace of mind is more important than maximum returns, LPS guarantee provides certainty that your money is 100% safe up to Rp 2 billion.

7.3 You Have a Fixed Target Date

If you know exactly when you’ll need the money (e.g., house down payment in 6 months), a deposit with matching tenor provides certainty:

• Fixed interest (not fluctuating)
• Fixed withdrawal date
• No temptation to use early

7.4 Bank Offers High Promotional Rates

Sometimes banks (especially digital banks) offer 6-7% promotional rates for new customers. If promotional rates are very high, deposits can be more attractive — but calculate after taxes first.

Example:

• Promotional deposit 6.5% gross = 5.2% net (after 20% tax)
• Average RDPU 4.8% net

In this case, the promotional deposit is more profitable.

Part 8: Hybrid Strategy — Combining Both

You don’t have to choose just one. You can combine both:

8.1 Emergency Fund Strategy

8.2 Large Idle Funds Strategy

If you have Rp 500 million sitting idle:

8.3 Deposit Laddering Strategy

If you still want deposits but need liquidity:

With this strategy, a deposit matures every month — providing RDPU-like liquidity while still earning deposit interest.

Part 9: FAQ

“Can RDPU lose money?”

Very rarely. Historically, RDPU have almost never recorded negative returns over a 1-year period. Monthly returns can be negative (very small), but annual returns are practically always positive.

Main RDPU risks:

• Investment manager risk — mitigated by choosing large, reputable IMs
• Underlying liquidity risk — mitigated by portfolio diversification
• Interest rate risk — if BI rate drops, RDPU returns also drop

“Are deposits fully guaranteed?”

Up to Rp 2 billion per customer per bank, yes. LPS (Lembaga Penjamin Simpanan/Deposit Insurance Corporation) guarantees deposits with conditions:

• Bank is LPS registered
• Interest doesn’t exceed LPS guaranteed rate
• Funds < Rp 2 billion per customer per bank

If a bank fails and your funds meet the criteria, LPS will reimburse 100%.

“Which is better for a house down payment?”

Depends on time horizon:

• < 1 year: RDPU (liquid, no penalty if needed sooner)
• 1-2 years with fixed date: Deposit (fixed interest, fixed date)
• > 2 years: Consider mixing with fixed income funds for higher returns

“Will RDPU returns drop if BI rate drops?”

Yes, but not immediately. RDPU have underlying instruments with various maturities, so the impact of BI rate cuts will be felt gradually (1-6 months). Deposits are also affected — banks will lower deposit rates following the BI rate.

“Is a tax ID (NPWP) required to buy RDPU or deposits?”

• RDPU: NPWP not mandatory, but transactions > Rp 100 million usually require it
• Deposit: Depends on bank policy, usually required for large amounts

Conclusion

Comparison Summary

Final Recommendations

Basic principle:

• If you prioritize return efficiency: choose RDPU
• If you prioritize certainty and guarantees: choose deposits
• If you want both: combine them

Both are instruments that are very safe and suitable for short-term goals. The “wrong” choice between them won’t hurt you significantly. What matters is that you start saving — whether in RDPU or deposits.

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