Savings or Time Deposits? A 1-Minute Cheat Sheet for When Interest Rates Rise [Banker]
“If the interest rate on savings accounts is going up, should I switch to a time deposit?”
I’ve been asked this at the counter more often lately.
That day, I was so careful not to say “it’s more profitable” that I ended up unable to say anything at all.
And Aya-senpai saw right through me with a single remark.
But in the end, the customer smiled and said one thing before leaving.
I’ll tell you what that was in the second half of this article.
[Conclusion]
A savings account is a “variable” deposit where the interest rate adjusts immediately when rates change.
A time deposit is a “fixed” deposit where the interest rate at the time of deposit remains until maturity (in the case of standard fixed-rate types).
Which one is better is for the customer to decide based on “when you need the money” and “whether you would be troubled if interest rates rose or fell.”
What you’ll learn in this article
-
How the interest rate movements differ between savings accounts and time deposits
-
A “part-time job hourly wage” analogy that you can explain in 1 minute
-
3 things to check before deciding on the term for a time deposit
▼ Latest News (As of October 2026)
In September 2026, the Bank of Japan raised its policy interest rate to around 1.25%.
This is the first rate hike in three months, since June.
Following this, the three megabanks announced they would raise the interest rate on savings accounts from 0.4% to 0.5% per year.
This takes effect on November 2nd. 0.5% is said to be the highest level in about 34 years, since 1992.
Japan Post Bank will also raise the rate on ordinary savings to 0.5% per year starting November 9th.
The next Bank of Japan meeting is scheduled for October 29th-30th.
During this period, inquiries at the counter about “should I switch to a time deposit?” increase.
In this article, I have summarized “how to think about choosing between savings and time deposits” that you can use the next time interest rates move.
10:00 AM, “Give me the longest time deposit you have”
*The following is a story based on a common scene at the counter.
A little past 10:00 AM on a weekday.
Mr. Sato (pseudonym) came to the counter.
He is a man in his 70s whose first grandchild was born in September.
He has come to consult about a child NISA for his grandchild before.
“For the child NISA, my son and his wife decided to start it themselves.”
“So, I have 5 million yen in a savings account that I had set aside to do something for my grandchild.”
Mr. Sato placed a newspaper clipping on the counter.
“It says here that savings account interest rates are going up. If that’s the case, wouldn’t a time deposit pay even more?”
“Give me the longest one. You have a 10-year one, right?”
I pressed my hand against the cheat sheet in my pocket.
The words Aya-senpai said to me the other day were ringing in my head.
“It’s not your place to decide what’s profitable.”
……I would go on to use those words in the wrong way.
What is the difference between a savings account and a time deposit?
Answer: With a savings account, the interest rate on all your deposited money changes when interest rates change. With a time deposit, the interest rate on the day you deposited the money remains fixed until maturity.
To use an analogy, think of it like an hourly wage for a part-time job.
A savings account is like a “part-time job where your hourly wage is adjusted to match the market.”
If market wages go up, your wage goes up.
If they go down, it goes down.
A time deposit is like a “part-time job where you promise to work for a year at this specific hourly wage.”
In exchange for making that promise, the hourly wage is often slightly higher than that of a savings account.
However, even if market wages rise during that time, you are stuck with the promised wage.
Conversely, even if market wages fall, your promised wage is protected.
In short, a savings account means “you can withdraw anytime, and the interest rate fluctuates.”
A time deposit means “you set a term, and the interest rate is locked in.”
Neither one is inherently better.
Do you want to lock it in, or do you want it to fluctuate?That is the fork in the road.
……And yet, at that moment, I didn’t even show the customer the fork in the road.
“That is for you to decide, sir.”
“Which is better, a 10-year time deposit or a savings account?”
I was only thinking about not saying, “This one is more profitable.”
So, I answered like this.
“That is…… something for you to decide, sir.”
Mr. Sato blinked.
“No, I mean. I’m asking you so that I can decide.”
“……Yes. Well, both have their advantages.”
I couldn’t get any more words out.
Mr. Sato’s brow began to furrow.
Just then, Aya-senpai, who was heading out for field work, walked past behind me.
Without stopping, she said in a low voice:
“Don’t pull back the ingredients yet.”
As the Furuns began to tremble,
in the next moment, they all crumbled into okara at once.
“Not recommending” and “saying nothing” are different things.
What happens if you lock into a long-term fixed deposit while interest rates are rising?
Answer: You are “locking in” for a long time at the interest rate of the day you deposited. If interest rates rise in the future, you will not receive the increase. If they fall, the promised interest rate continues.
No one knows how interest rates will move in the future.
They might rise, they might stay the same, or they might fall.
A 10-year fixed deposit is a promise of “this hourly wage for 10 years.”
-
If interest rates continue to rise, you won’t receive the increase
-
If interest rates fall, you are saved because the promised interest rate continues
Will you regret it regardless of which way it goes?
That is what I confirm with the customer.
What happens if you cancel midway?
Most fixed deposits can be cancelled midway.
However, you will not receive the promised interest rate.
To use an analogy, it’s like quitting a part-time job with a “one-year contract” halfway through.
You can quit. But you won’t be paid the promised hourly wage, and it will be recalculated at a much lower rate.
This lower interest rate is called the “mid-term cancellation rate.”
How much it drops depends on the product and the period you deposited for.
That is why putting “money you might need soon” into a long-term fixed deposit can cause problems.
Amidst the crumbled okara, I remembered the feel of the paper in my pocket.
The two lines on the back of the cheat sheet
In the pile of okara, there was just one.
A little one, furrowing its brow, holding back tears, and standing its ground.
It was Porotofu.
The soybean mark on its back looked slightly different in shape from the others.
I took the cheat sheet out of my pocket.
On the front, the words I had added over time were lined up.
However, what I used today was the back side.
On the blank back, I drew two lines with a ballpoint pen.
On the top line, I drew a wave. A wave that goes up and down.
The bottom line was straight.
“Mr. Sato. The top is a savings account, and the bottom is a fixed deposit.”
“A savings account is like a part-time job where your hourly wage is reviewed. A fixed deposit is a part-time job where you promise to work for a certain number of years at a set hourly wage.”
Mr. Sato leaned forward.
“A 10-year fixed deposit means keeping this line straight for 10 years.”
“You can stop halfway, but you won’t get the promised hourly wage.”
“Hmm. …Then, what if I have plans to use it during those 10 years?”
“That is what I wanted to think about with you.”
Mr. Sato looked at the lines for a while.
“Next March, my grandchild will have their first festival. I want to buy them a doll set.”
“That means you’ll be using it in less than half a year.”
Mr. Sato drew a small circle in front of the straight line himself.
Then, he smiled and said.
“Then, I’ll have the hourly wage reviewed every year.”
The ‘one thing’ I mentioned in the introduction was this.
Keep the money for the first festival in a savings account.
Put the rest into a fixed deposit where the interest rate can be reviewed every year.
It was Mr. Sato himself who decided this.
“Can I have this paper? I want to show it to my son.”
“I’m sorry. It’s against the rules for me to give you the memo I wrote.”
“Instead, please take this guide to our in-store interest rates.”
Mr. Sato accepted the guide.
Then, he copied the wavy line and the straight line onto the margin of a newspaper clipping.
“With this, it’s my own memo.”
He left just after 11:30.
The newspaper clipping went into Mr. Sato’s breast pocket.
Three things to check before deciding the term of a fixed deposit
Answer: The three things are ‘When will you use the money?’, ‘Might you use it halfway through?’, and ‘Will you be okay whether interest rates rise or fall?’
1. When will you use the money?
Match the maturity date to before the day you need to use the money.
The basic rule is not to set a duration that goes beyond the day you know you will need the funds.
2. Might you need to use it along the way?
If you put money you might need for sudden expenses into a fixed deposit, you will end up canceling it early.
If that happens, you won’t receive the promised interest rate.
Keep money you might need soon in a savings account, where it can be withdrawn at any time.
3. Will you be okay whether interest rates rise or fall?
Long-term fixed deposits are helpful when interest rates fall.
Short-term fixed deposits are easier to adjust when interest rates rise.
Both have their pros and cons.
You can also split your funds into several different terms.
The customer decides which one to choose.
The job at the counter is to lay out these three points and provide the material needed to make that decision.
A 1-minute cheat sheet to read at the morning assembly
Good morning. Here is today’s 1-minute cheat sheet.
Starting in November, the savings account interest rates at the three mega-banks will rise to 0.5% per year. We are seeing an increase in consultations asking, “Should I switch to a fixed deposit?”
There are two things to convey.
First, a savings account is like a part-time job where your hourly wage is reviewed. When interest rates change, the interest on all the money you have deposited changes as well. A fixed deposit is like a part-time job where you promise, “I will work for this hourly wage for this many years.” The interest rate does not change until maturity. You can cancel early, but you will not receive the promised interest rate.
Second, the customer decides the duration. We work together to lay out the factors: “When will you need the money?” “Might you need to use it along the way?” and “Will you be okay whether interest rates rise or fall?”
Don’t just end with “It’s up to you, the customer”; provide the material they need to make the decision.
Not recommending something is not the same as staying silent. That is all. Thank you for your hard work today.
Behind the cheat sheet, after the shutters close
3:00 PM, after the shutters were pulled down.
Aya-senpai stopped in front of my desk.
“The cheat sheet.”
When I took it out of my pocket, she took it and silently flipped it over.
Wavy lines and straight lines. A small circle drawn by Mr. Sato.
“The initial ‘It’s up to the customer’ is 0 points.”
“What you drew on the back isn’t bad.”
“Combined, that’s 55 points.”
Ten points more than last time.
My heart felt just a little bit lighter.
After returning the cheat sheet to me, my senior colleague went back to writing her field reports just like that.
…I feel like she looked at the lines on the back one more time before handing it back.
I turned the cheat sheet over to the front and added a note at the very top.
“Not recommending something is different from staying silent.”
A scene after getting home
At night, while I was copying the lines from the back of the cheat sheet into my notebook at home, a voice came from above my head.
“That ‘hourly wage’ analogy is pretty easy to understand.”
“So, when are you going to review my interest rate?”
“…Poisuke, yours is fixed.”
“Geez! Why is that?!”
Frequently Asked Questions
Q. When will savings account interest rates go up?
A. The three mega-banks (Mitsubishi UFJ, Sumitomo Mitsui, and Mizuho) have announced that they will increase the rate from 0.4% per annum to 0.5% per annum starting November 2, 2026 (before tax). Japan Post Bank’s ordinary savings will be 0.5% per annum starting November 9. For savings accounts, the new interest rate will be applied automatically to the money you have on deposit, and no procedures are required. For other financial institutions, please check their respective announcements.
Q. Will the interest rate on my existing time deposits also go up?
A. Generally, fixed-rate time deposits remain at the interest rate they were at when you deposited them until maturity. When they reach maturity and you continue them (such as through automatic renewal), they will change to the interest rate at that time.
Q. Is there tax on deposit interest?
A. Yes, there is. Interest is subject to a 20.315% tax (15% income tax, 0.315% special reconstruction income tax, and 5% resident tax), which is deducted when you receive it. When comparing interest rates, be sure to check whether they are before or after tax.
※ This article is based on information as of October 11, 2026. Please check the announcements from the Bank of Japan and each financial institution for interest rates and application dates. This does not recommend any specific financial product.
Thank you for reading this far.
I would be happy if today’s “hourly wage” cheat sheet helps you even a little at the counter tomorrow.
Aya-senpai would probably tell me, “Don’t get carried away with a 55-point score,” but…
If you could give me a Like (♡) or a follow, it would keep my Tofurun from collapsing.
If you thought, “Puri, bring the materials from the start next time,” a tip would also be encouraging. Of course, just reading it is more than enough.
Poisuke’s retorts are also available as LINE stickers.
See you in the next cheat sheet.