Note: This article discusses Indonesian financial products and regulations. The underlying investment principles apply globally.

Inflation and Why Bank Deposits Alone Aren’t Enough

Your money loses value every day. This isn’t hyperbole — it’s a mathematical fact proven by Bank Indonesia data over decades. If you keep money in deposits and feel “safe,” this article will explain why that feeling of safety can be deceiving.

What Is Inflation?

Inflation is the general and continuous increase in prices of goods and services in an economy. When inflation rises 5%, it means an item that cost IDR 100,000 last year now costs IDR 105,000. Your money hasn’t decreased in quantity, but its purchasing power has declined.

Bank Indonesia (BI) has an inflation target of 2.5% ± 1%¹ — meaning BI considers healthy inflation to be in the range of 1.5% to 3.5% per year. However, in reality, Indonesia’s average inflation over the last 20 years has been around 4-5% per year.

Indonesia Inflation Data

Here is Indonesia’s annual inflation data (source: Bank Indonesia and BPS - Statistics Indonesia):

Year	Inflation (%)
2015	3.35
2016	3.02
2017	3.61
2018	3.13
2019	2.72
2020	1.68
2021	1.87
2022	5.51
2023	2.61
2024	1.57
2025	2.92 (Dec)

Average inflation 2015-2024 is about 2.9%. But this was a relatively tame period. If we look at a longer period (2000-2024), average inflation approaches 5% per year, including the 2005 inflation spike (17.1%) due to fuel price increases and 2008 (11.1%) due to the global crisis².

More importantly: the inflation you feel is often higher than official figures. Prices of food, education, and healthcare — essential needs — tend to rise faster than average inflation.

What Are Current Deposit Interest Rates?

Let’s look at deposit rates from major Indonesian banks:

Bank	1-Month Deposit	3-Month Deposit	12-Month Deposit
BCA	2.25%	2.50%	2.75%
Mandiri	2.50%	2.75%	3.00%
BRI	2.50%	2.75%	3.00%
BNI	2.25%	2.50%	2.75%

Source: Official websites of each bank, as of early 2026. Interest rates may change at any time.

Digital banks and smaller banks may offer higher rates (4-6%), but major banks that hold most of the public’s deposits offer ranges of 2.25% - 3.00%.

Don’t Forget Deposit Taxes

Deposit interest above IDR 7,500,000 is subject to 20% final tax (PPh)³. This means, if your deposit pays 3% interest per year, after tax you only receive:

3% × (1 - 20%) = 2.4%

Yes, your net deposit return is only about 2.4% per year after tax.

Real Return: The Number That Actually Matters

Real return is return after subtracting inflation. This is the number that truly determines whether your wealth is growing or shrinking.

Let’s calculate:

• Deposit interest after tax: 2.4%
• Average inflation (conservative): 3.0%
• Real return: 2.4% - 3.0% = -0.6%

In other words, every year your deposit’s purchasing power decreases by about 0.6%. Using more realistic inflation (4-5%), your deposit’s real return could reach -1.6% to -2.6% per year.

This isn’t “investing.” This is slow and certain wealth erosion.

The Impact of Purchasing Power Erosion Over the Long Term

Numbers like -0.6% or -1.6% per year may sound small. But compounding works both ways — including for losses. Let’s see what happens to IDR 100 million kept only in deposits:

Scenario 1: 3% Inflation, 2.4% Net Deposit

Year	Nominal Value	Purchasing Power (Today’s IDR)
0	IDR 100,000,000	IDR 100,000,000
5	IDR 112,600,000	IDR 97,000,000
10	IDR 126,800,000	IDR 94,100,000
20	IDR 160,800,000	IDR 88,500,000
30	IDR 203,900,000	IDR 83,300,000

After 30 years, your money nominally appears to double — but its purchasing power has dropped 17%. IDR 203 million in 2056 can only buy what IDR 83 million can buy today.

Scenario 2: 5% Inflation, 2.4% Net Deposit

Year	Nominal Value	Purchasing Power (Today’s IDR)
0	IDR 100,000,000	IDR 100,000,000
5	IDR 112,600,000	IDR 88,200,000
10	IDR 126,800,000	IDR 77,900,000
20	IDR 160,800,000	IDR 60,600,000
30	IDR 203,900,000	IDR 47,200,000

With 5% inflation, your IDR 100 million’s purchasing power drops by more than half in 30 years. Money that should be enough for a comfortable retirement suddenly is only worth half.

💡 Calculate retirement needs with inflation: Our Retirement Calculator accounts for inflation when calculating how much you truly need for retirement — including future purchasing power simulations.

Real Example: Prices Then vs Now

Still in doubt? Try to remember these prices:

Item/Service	~2005	~2015	~2025
Street fried rice	IDR 5,000	IDR 12,000	IDR 20,000
Pertamax gasoline (liter)	IDR 4,500	IDR 8,900	IDR 13,300
University tuition/semester	IDR 3 million	IDR 8 million	IDR 15 million
Type 36 house (Greater Jakarta)	IDR 80 million	IDR 250 million	IDR 500 million

Fried rice prices rose 4x in 20 years. House prices rose 6x. Can your deposits keep up with these increases? Certainly not.

”But Deposits Are Safe, Right?”

True, deposits are guaranteed by LPS (Lembaga Penjamin Simpanan / Indonesia Deposit Insurance Corporation) up to IDR 2 billion per customer per bank⁴. From a nominal safety perspective, deposits are indeed very safe.

But “safe” and “sufficient” are two different things.

Deposits are safe from nominal loss risk. But deposits are not safe from inflation risk. Your money remains, but its value decreases every year. It’s like storing ice cubes in a freezer with temperature slightly above zero — the ice is still there, but slowly melting.

The Proper Role of Deposits

This doesn’t mean deposits are useless. Deposits have a clear role:

1. Emergency fund — money that must be accessible anytime without risk of nominal decline
2. Money to be used within 1-2 years — for example, for a house down payment or wedding costs
3. “Safe” portion of portfolio — as a balance to risky assets according to your asset allocation

The problem is when all your wealth is in deposits. That’s not a financial strategy — it’s an expensive delay.

So What Should I Do?

If deposits aren’t enough, what are the alternatives? The answer is investing in assets whose returns can beat inflation over the long term. Some options:

1. Equity index funds — average JCI returns of about 10-12% per year over the long term, well above inflation
2. SBN Ritel / Retail Government Bonds (ORI, SBR, SR, ST) — coupons of 5-6.5%, only 10% tax, better than deposits
3. Fixed income mutual funds — returns of 6-8% per year, lower risk than stocks

The key isn’t to avoid deposits, but don’t only rely on deposits for long-term financial goals. For a complete comparison, see Deposits vs SBN vs Money Market.

Conclusion

The facts are simple:

1. Indonesia’s inflation averages 3-5% per year
2. Major bank deposits offer 2.25-3% interest (net ~2.4% after tax)
3. Real return on deposits is negative
4. Your deposit’s purchasing power decreases every year
5. Over 20-30 years, purchasing power loss can reach 20-50%

Deposits are not investments — deposits are a parking place for money. For money you won’t use for 5+ years, you need instruments whose returns can beat inflation.

First step? Understand that not investing also has risks — the risk of purchasing power loss that is certain and inevitable. Read more about overcoming fear of investing and understanding the risk and return spectrum.

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Data sources: Bank Indonesia, Badan Pusat Statistik (Statistics Indonesia), OJK, official websites of BCA, Mandiri, BRI, BNI.

Disclaimer: This article is for educational purposes only, not investment advice.

Related Articles

• Deposits vs Government Bonds vs Money Market Funds
• Emergency Funds: How Much and Where to Keep Them
• Asset Allocation: The Foundation of Passive Investing
• How to Start Investing for Beginners
• Fixed Income Mutual Funds: Lower Risk Than Stocks

Footnotes

1. Bank Indonesia, Monetary Policy Framework. Inflation target is set in coordination with the Government. ↩

2. Historical Indonesia inflation data available at Bank Indonesia - Inflation Data and BPS - Consumer Price Index. ↩

3. 20% final income tax (PPh) on deposit/savings interest above IDR 7.5 million. Legal basis: PP 131 of 2000 jo. KMK 51/KMK.04/2001. ↩

4. Lembaga Penjamin Simpanan (Indonesia Deposit Insurance Corporation), Deposit Insurance. Deposits insured up to IDR 2 billion per customer per bank. ↩