A young man came in last month with a figure written on a piece of paper. His savings, about eighteen months' worth from his first job. He slid it across the desk and asked, very politely, how long it would take to double. I could tell from how he asked that he'd already been given an answer somewhere else and wanted me to confirm it.
I didn't confirm it. Here's what I said instead, because it's a conversation I have a couple of times a month and it deserves writing down.
The question has a hidden second half
Nobody really asks how to double their money. They ask how to double it quickly, and safely, and usually both at once.
Doubling is easy to describe. Leave money somewhere that grows and wait long enough. What's hard is the "quickly" part, because the only way to speed it up is to take more risk, and the "safely" part, because taking more risk means accepting that it might halve instead.
Those three words pull against each other, and any answer that claims to deliver all three at once is describing something that doesn't exist.
Why I won't give you a number of years
There's a neat piece of arithmetic that tells you how long doubling takes at a given rate. It's correct arithmetic. The problem is the rate.
Nobody knows what rate your money will earn over the next several years. So any "it'll double in X years" answer is really "if I assume a rate, and if that assumption turns out right, it'll double in X years". The assumption is doing all the work and it's hidden inside a confident sentence.
That's why you won't find a projection anywhere on this site. We've explained that more fully on our page about compounding. A calculator will do the arithmetic on a rate you choose, which is fine. Me telling you the rate is not.
What the person who promised a date was actually saying
The young man eventually told me where the earlier answer came from. A scheme somebody at his workplace was part of, which paid a fixed monthly amount and would "double in three years for sure".
I'll say this as plainly as I can. When somebody promises a specific multiple over a specific period with certainty, one of three things is true. They don't understand what they're describing. They're describing a fixed-income product and rounding generously. Or it isn't a legitimate arrangement at all.
The third one is the dangerous one, and it's more common than people think in smaller cities, usually passed along by somebody the investor trusts. Our guide on checking whether somebody is registered takes two minutes, and if the arrangement isn't a verifiable regulated product, that's your answer.
What actually makes money grow meaningfully
Not a clever product. Three dull things.
Time. Growth builds on itself, so the longer money is left alone the more of the result comes from growth rather than from what you put in. That's slow at the start and noticeable much later.
Adding to it. Doubling a sum is less important than steadily enlarging it. Someone who keeps investing monthly and raises the amount as their income rises will usually end up far better placed than someone obsessing over how fast one lump sum grows. Our page on the step-up SIP covers that.
Not interrupting it. Every withdrawal and every panicked exit during a fall resets part of the progress. This is where most people actually lose ground, and it has nothing to do with which scheme they picked.
What I told him to do with his eighteen months of savings
First, not all of it was investing money. He had no buffer, and a first-job income is exactly the kind that can wobble. So a chunk stayed somewhere stable and reachable, as our page on building an emergency fund describes.
Second, he had a two-wheeler loan. Clearing that had a certain outcome, so part went there.
Third, what was left, plus a monthly amount he could genuinely keep up even in a bad month, went into long-horizon investing with the clear understanding that it would move around, sometimes downward, and that he wasn't to judge it on a year or two.
He looked slightly disappointed. He'd come in hoping for a shortcut, and I'd handed him a buffer, a loan repayment and patience.
The better question to ask
If I could swap his question for a different one, it would be: "What would make me stop?"
Because the thing that decides whether money grows over ten years is almost never the product. It's whether the person is still invested in year ten. People stop because they needed the money and had no buffer, because a fall frightened them, or because somebody offered them something faster.
Answer that question honestly at the start and you've dealt with most of what actually goes wrong. Our page on risk and volatility is essentially a longer version of that question.
The version of this question I hear from parents
It comes in a slightly different form from people in their forties. They've saved something for a daughter's wedding or a son's admission, it's five years away, and they want to know how to double it by then.
That's a harder conversation, because the date is real and it doesn't move. Money needed in five years can take some movement, but not enough to make doubling a reasonable expectation, and the last couple of years before the date should be getting safer rather than riskier. Our page on saving for a child's marriage covers how that goal is usually handled.
What I end up saying is that the target should probably come from what the event will cost and what can be added between now and then, not from the idea of doubling what's already there. Adding a sensible monthly amount does more for a five-year goal than any hope about growth.
What I'd rather you measured
Multiples are a poor thing to track, because they depend almost entirely on markets you can't control.
Three things are better, and all of them are yours. Did you invest every month this year? Did you raise the amount when your income went up? Did you leave it alone when it fell? Somebody who can answer yes to all three for ten years running doesn't need to ask how long doubling takes. The result takes care of itself far more reliably than any shortcut.
A few things that should make you suspicious
- A specific multiple promised over a specific period.
- The word "sure", "fixed" or "no risk" attached to anything that isn't a bank deposit.
- Money going to a person's account rather than to a named fund house or bank.
- Pressure to decide quickly, or a limited window.
- Returns described only by what they did last year.
Any one of those deserves a pause. Two or more deserves a firm no.
Where he ended up
He came back three weeks later. He hadn't put money into the workplace scheme, partly because a colleague had quietly mentioned that payments had become irregular.
He'd started a modest monthly amount instead, and he told me the most useful thing I'd said was that nobody could tell him how long doubling would take. It meant, in his words, he could stop waiting for a date.
That's the whole point, really. If you're waiting for a number, you'll keep looking for someone who'll give you one, and the people most willing to give you one are the ones to avoid. Myfolios is an AMFI-registered mutual fund distributor (ARN-145870) working from Indore since 2014, and we'll happily have the less exciting version of this conversation with you.
