"Tansu Yokin" Is Shrinking Every Year - How Much Does Keeping Cash at Home Really Cost?

Japan's Tansu Yokin Tops 100 Trillion Yen

According to Bank of Japan statistics, cash hoarded in Japanese households - known as tansu yokin (literally "dresser savings") - is estimated at over 100 trillion yen, or roughly 800,000 yen per person. "Bank interest is basically zero, so why not keep it at hand?" is the common reasoning. Many people store cash at home for immediate access.

But tansu yokin has a major pitfall. While the face value stays the same, inflation steadily reduces what that cash can buy. It is like an invisible tax eating away at your money year after year.

1 Million Yen in a Drawer Is Worth Only 550,000 After 30 Years

At 2% annual inflation, the real value of 1 million yen shrinks by 2% every year. After 10 years: 1,000,000 x (0.98)^10 = roughly 820,000 yen. After 20 years: about 670,000 yen. After 30 years: about 550,000 yen. The bills still say 1,000,000 yen, but they only buy what 550,000 yen buys today. Some 450,000 yen of purchasing power has evaporated without you lifting a finger.

Scale that up to the national total: at 2% inflation, 100 trillion yen of tansu yokin loses roughly 2 trillion yen in real value every year. Two trillion yen "evaporating" across Japan annually - that is the true cost of keeping cash at home.

Tansu Yokin vs Bank Deposit vs Index Fund

Compare 1 million yen held three different ways over 30 years (real value after adjusting for 2% inflation). Tansu yokin: real value 550,000 yen (a 450,000-yen loss). Bank deposit at 0.1% interest: real value about 560,000 yen (interest adds 30,000 yen, but inflation wins). Index fund at 5% return: real value about 2.4 million yen (even after inflation, purchasing power more than doubles).A home safe is fine for storing cash, but keep the amount to the bare minimum.

The only tansu yokin you truly need is emergency cash for disasters or bank-system outages - roughly one to two weeks of living expenses (50,000 to 100,000 yen). Anything beyond that is being silently stolen by inflation, an invisible thief. Move the money from your drawer to a place where compound interest can work on it.