I keep seeing people ask the same question right now: when should you buy a stock during all this market chaos? With the S&P 500 swinging wildly — up over 4% early on, then down nearly 19% on tariff concerns, then bouncing back hard — everyone wants to know if now's the moment to jump in or if they should wait for things to calm down.

Here's what I realized after digging through the data: history actually gives us a pretty clear answer, and it might not be what you expect.

Since 1928, the S&P 500 has entered bear market territory 25 times. That's a lot of scary moments. And corrections? Even more frequent. But here's the thing — when you look at a chart going back to 1957 when the index took its current form, every single one of those crashes looks like a tiny blip now. The dot-com bubble, the 2008 meltdown, the COVID crash — they all got smoothed out by time.

So when should you buy a stock? If you're thinking long-term, the answer is almost always now, or whenever you have the money. The data shows that any time you invested in the S&P 500, even right after major crashes, you came out ahead if you just held on long enough. Yeah, you might have made more money if you somehow timed the exact bottom, but that's nearly impossible to do consistently. Some people try to sell before crashes and buy during them, but they usually end up worse off than if they'd just bought and held through the noise.

Now, what if your timeline is shorter? Say 10 years instead of decades. The historical rolling returns still look pretty solid. Going back to 1926, the 10-year annualized returns on the S&P 500 have almost always been positive, and for much of that history, they've been in double digits. Even if when should you buy a stock is your question and you can't wait 30 years, a 10-year horizon gives you decent odds.

Why does history favor investors? The stock market has this built-in correction mechanism. When the economy weakens, the Fed cuts rates, making it cheaper for companies to expand and recover. When political decisions cause crashes like tariff worries, the longer the market stays down, the more pressure builds to change course. Elections happen every two to four years, which acts as another reset button. Within the index itself, stocks that succeed get heavier weighting while struggling ones get lighter — automatic rebalancing.

I think the real insight here is that when should you buy a stock isn't actually the right question if you're serious about building wealth. The better question is whether you have money you won't need for at least several years. If you do, history suggests you should probably invest it. Trying to wait for perfect conditions usually costs more than just getting in and staying in.

The market will keep whipsawing. There will be more scary drops. But if your timeline is long enough, those drops look like the best opportunities in hindsight. And that's the lesson the data keeps showing us, year after year.