Every “start investing” article online tells you to “build an emergency fund first” — but almost none of them tell you how much, or where to put it. As a Japan resident, your situation is actually different from the typical US/EU advice. Here’s what I’ve learned the hard way.
Why the “3-6 Months” Rule Doesn’t Quite Fit Japan
The standard advice is “save 3 to 6 months of expenses.” In Japan, you can often get away with less because:
- Universal health insurance caps your monthly medical costs (the “Kogaku Ryoyohi” high-cost care system)
- Unemployment insurance pays 50–80% of your salary for up to 12 months
- Severance pay (退職金) at most full-time jobs provides a cushion
But there’s a flip side. Job-hopping in Japan can take longer than in the US, and many landlords require 2–3 months of rent as a deposit if you move. So you need more liquid cash for housing transitions.
My Recommended Emergency Fund by Situation
Single, no dependents
3 months of expenses. If you spend ¥250,000/month, that’s ¥750,000. This covers a job transition without burning your investments.
Married, dual income, no kids
4 months of combined expenses. One job loss won’t sink you, but two might. Build the buffer accordingly.
Married with children
6 months of expenses, plus an additional ¥500,000 reserved for child-related emergencies (childcare disruption, sudden medical, school changes).
Foreign resident on a work visa
6 months minimum. If you lose your job, your visa is at risk. You need cash to either find a new sponsor or fund a return home. This is the most overlooked risk for foreign residents in Japan.
My Real Experience
When I started investing in 2022, I had only ¥300,000 in savings and ¥800,000 in stocks. I felt rich. Then my company restructured my division and I considered changing jobs — but I couldn’t, because I would have had to sell stocks during a downturn just to pay rent. That’s the moment I rebuilt my approach.
Today, I hold ¥2 million in liquid emergency cash before any stock buys. This isn’t optimal “math return” — it’s “sleep at night” return. And it lets me invest aggressively with my non-emergency funds because I know my floor.
Where to Park Emergency Cash in Japan
- Megabank ordinary account (普通預金): 0.001% interest, but instant access. Good for the first ¥500,000.
- Online bank time deposit (定期預金): 0.2–0.5% interest. Lock for 6–12 months. Good for the bulk of your fund.
- Auspost Yucho or JA Bank: Wide ATM coverage if you live outside major cities.
I avoid putting emergency funds into FX, crypto, or bonds. The point isn’t yield. The point is that the money is there when you need it.
Summary: The Sequence
- Calculate your monthly expenses honestly (include rent, utilities, food, transport, insurance)
- Multiply by the appropriate factor for your situation
- Hold that amount in liquid yen before buying any stocks or crypto
- Once the fund is built, restart investing — but don’t touch the fund
Investing without an emergency fund is gambling with your security. Build the floor first, then the ceiling can grow as high as you want.
Disclaimer: This article is for informational purposes only and is not investment advice. It does not recommend any specific financial product. Investment decisions are your sole responsibility, and you may lose your principal. Tax rules and financial regulations described here reflect the situation as of 2026 in Japan and may change. Please consult a licensed advisor or the official sources (FSA, NTA, MOF) for the latest information.
