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The story
A thread titled “Seriously, why aren’t you guys doing NISA?” appeared on 5ch’s News VIP board, sparking a debate over Japan’s tax-free small-investment program, NISA. Opinions flew back and forth — some argued that maxing out your annual tax-free allowance in your early 30s and then just leaving it alone is the way to go, while others insisted you should invest before inflation erodes the yen’s value. Meanwhile, opinion split sharply over whether lump-sum investing or dollar-cost averaging (regular installment buying) is the better strategy. The discussion expanded further, touching on whether the claim that “the longer you invest, the higher the odds of ending up with a loss” actually holds up, what counts as “spare” money to invest, and even counterarguments that people should start a company and run a business instead of investing. The thread ran past 100 replies.
What people said
Golden rule: buy what you want, now.
The same car costs several times more today than it did five years ago.
That's exactly why you invest.
No way it costs several times more lol what are you driving, a toy car? lmaooo
Ever heard of dollar-cost averaging!?
FYI I'll have mine maxed out by age 33.
Gonna try leaving the NISA allowance untouched until I'm 65.
Something as small as the NISA allowance is covered by spare cash alone.
Yeah, that's the golden rule.
I've maxed my NISA and I'm also putting money into a regular taxable account, but I still keep 8 million yen in cash reserves.
1 million yen is plenty for living expenses.
If you actually believe that, that's rough.
People just love trash-talking when the market's up, and they're simply not on 5ch when it's down lol
It's not anxiety — they're just here baiting guys like you for fun.
So you admit they go quiet when it's down lol
That's basically what Re: #66 was saying. Guess you hit a nerve.
I'm here even when it's down, though.
I've got you beat on education and assets, must sting. Jealous?
Well, I get that if you're poor, not hedging against inflation makes you anxious lol
You can't buy groceries with stock certificates — you always have to convert back to yen eventually anyway, so I can't be bothered with the hassle of investing.
Sounds like YOU'RE the poor one who can't even afford to invest lol
Enjoy being a wage worker till you die, lmaooo
Nah, I already have plenty of money, so I don't need to invest lol
There's a chance a huge crash hits and stocks never recover in my lifetime — why would I go out of my way to take on that risk?
Why not just start a company and run a business instead?
No matter how much prices rise, you just need to earn enough at whatever the going rate is at the time.
Hire employees and they'll keep earning for you no matter how old you get.
Ah, so you just won the "parent gacha" (slang for the luck of the draw in which family you're born into, like a gachapon toy machine).
Good for you, having such accomplished parents lol
Even if you're not investing, you must be hedging somehow, right?
Chocolate that used to cost 100 yen is now like 150 yen.
The more cash you're sitting on, the faster it should be losing value.
I just keep it in the bank — it earns interest, and I'm not spending more than that.
Under inflation, interest rates rise too, so I figure it's safer than investing.
Why not just start a company and run a business instead?
No matter how much prices rise, you just need to earn enough at whatever the going rate is at the time.
Hire employees and they'll keep earning for you no matter how old you get.
Against a booger-sized interest rate, inflation is running way too hot — there's no way your assets aren't shrinking like crazy.
Why would I need to earn even more when I already have enough?
Re: #117
I've got nothing but gratitude for my parents.
What if you go all-in tomorrow and the market crashes the very next day, and it never recovers in your lifetime?
Going all-in would be idiotic.
Of course I keep a 30% defensive cash cushion lol
Lump-sum investing is the correct move, so why are you keeping 30% back?
Re: #139
There's no guarantee a business will succeed, and it's a hassle.
Why not just start a company and run a business instead?
No matter how much prices rise, you just need to earn enough at whatever the going rate is at the time.
Hire employees and they'll keep earning for you no matter how old you get.
Hedging risk is just common sense.
There's no guarantee the market goes up every single year, after all.
I'm not fully sold on this argument either.
If you're unlucky and your lump-sum buy lands right at a market peak, I'd think performance would genuinely suffer.
Why not just start a company and run a business instead?
No matter how much prices rise, you just need to earn enough at whatever the going rate is at the time.
Hire employees and they'll keep earning for you no matter how old you get.
You're doing long-term investing, right?
Do you seriously think spreading the same amount over 30 years of installments beats a lump sum today on average purchase price? lololol
Isn't there a chance the market just keeps declining every year from here and never recovers before you die?
Why not just start a company and run a business instead?
No matter how much prices rise, you just need to earn enough at whatever the going rate is at the time.
Hire employees and they'll keep earning for you no matter how old you get.
A world where "Orukan" (nickname for eMAXIS Slim All Country, a popular index fund tracking the world's stock markets) keeps declining and never recovers before you die basically means humanity has collapsed.
By then the yen would be worthless paper and your employer would've gone under too lol
I wouldn't mind even if I lost my job, but my employer won't go bankrupt unless Japan itself ceases to exist.
A decades-long drawdown seems perfectly plausible to me, though — I get it, you're a die-hard Orukan believer lol
Why not just start a company and run a business instead?
No matter how much prices rise, you just need to earn enough at whatever the going rate is at the time.
Hire employees and they'll keep earning for you no matter how old you get.
Huh?
If Orukan — made up of the world's top 2,500 companies by market cap — is crashing and declining long-term,
why on earth would some tiny-market-cap Japanese company be fine?????
Are you living in a fantasy world or something? lmaooo
If that's what you think, then just don't invest? No one's forcing you 👋
I'm a diversification guy myself,
so my question is just — is "lump-sum is unbeatable!" actually true?
Because the data actually backs it up.
The longer the investment horizon, the higher the probability of ending up with a loss.
I'm just following the findings of people smarter than me 👋
The probability of a loss goes UP the longer you invest?
Background and Key Points of the Debate
NISA (Japan’s tax-free small-sum investment program) moved to a new system in 2024, raising the annual tax-free allowance to 3.6 million yen (a 1.2 million yen “installment investment” bracket plus a 2.4 million yen “growth investment” bracket) with a lifetime cap of 18 million yen invested tax-free. The thread’s central dispute — lump-sum investing versus dollar-cost averaging (regular installment buying) — is a long-running debate in investment theory. Statistically, many studies show lump-sum investing tends to beat installment investing on average returns, though installment buying can still be the more rational choice depending on one’s tolerance for the psychological strain of downturns and the nature of the money being invested. Meanwhile, the claim that “the probability of a loss rises the longer you invest” runs counter to the commonly cited statistic that, for diversified stock holdings, the probability of a loss actually falls the longer the holding period — and that drew pushback within the thread itself. Since the validity of claims like these depends heavily on the assumptions behind them, readers shouldn’t take them at face value, but should weigh them against their own risk tolerance and financial plans.
*This article is compiled from excerpts and summaries of the 5ch (News VIP) thread “Seriously, why aren’t you guys doing NISA?“
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