We Were Wrong About Compound Interest

So for years, I kept seeing the same thing happen. Someone would pull up a spreadsheet, right? And on that spreadsheet was this, a beautiful, smooth, smooth cut. £250 a month, 8% a year. And by 60, you're going to have well over 300 grand. And almost every time alongside that, they would quote Einstein, right? Compound interest is the eighth wonder of the world. Funny thing, there's no real evidence that he ever said that, okay? But honestly, that's not the biggest thing that we got wrong about the whole concept of compound interest. Look, for years, my job in that exact situation when someone would pull up all of those charts and all that sort of stuff was basically just to smile, nod, and help them set up the direct debit, right? Then I went back and looked at what actually happens to the money of the people that I've been working with over the years. How closely did it actually track that smooth curve? And what I found changed pretty much how I think we communicate about the notion of compound interest and how we're all going to experience that moving forward. So a few years ago, I went through like 10, 15 years worth of real portfolio data of the people that I've worked with when we do sort of like what's called Monte Carlo simulations or compound growth expectations and all that sort of stuff. Yes, I know, before you say it, I really need to get a life, okay? This was essentially everyone who had started a sort of regular investment plan believing in that curve that we discussed at the start. And almost none of them had a wealth creation and generation line that looked anything like the textbook graph that we would have talked about 10 years ago or whatever it was. For most of them, that promise, that compound growth just never really kind of showed up. Now, the point here is the maths of compound interest isn't wrong, obviously, right? It's simple, it's objective, and it doesn't really like change. But what we get wrong was how the maths collides with life, right? With actual human life. We are sold a static, non sort of fluid formula for a world that is anything but static. So in this video, I'm going to show you the three places where that smooth curve falls apart. And then I'm going to show you basically the model that people who actually did succeed were actually following. So let's get into it, right? The whole textbook model hangs on this one word, right? We've talked about it, consistency and rigidity. It assumes that two things stay the same consistently for 40 years. One, you get steady returns every single year. Number two, you keep paying in without a break the entire time. And in real life, neither of those exist, right? Not even close either. Look, the data from the Financial Conduct Authority shows that the average retail investor holds an investment, typically an equity fund, for less than five years. Five years. Nobody buys an index fund at like 25 and leaves it alone and doesn't touch it until 60 because life happens. I'm sure you've experienced this, right? You change careers, you get married, you need some money, you need a house deposit. A business doesn't quite work out. The market drops by 30% and you panic and sell a little bit into cash. So let's run some numbers on what a real life curve actually does look like. So let's say that you invest 500 pounds a month at 7%. After 15 years, the textbook says that you'll have about 158,000 pounds. Now let's add in some real life, shall we? In year seven, you take out 10,000 pounds for a house deposit. Then you change jobs and pause your contributions for, let's say, 18 months or so. You finish with about 126,000. That is what? 32,000 pounds short. And here's the thing that most people miss about this whole equation. Only 19,000 pounds of that gap is money you actually took out or theoretically didn't pay in, right? The other 13,000, that is growth that never happens. Returns those pounds would have earned if they'd have just stayed put. When you interrupt compounding and compound growth, you don't lose money. Don't just lose money, right? You lose everything that that money was going to become, the money that that money would have created. The textbook shows an unbroken, fluid curve. Real life is just a series of resets all the time. But there is genuinely a deeper problem with all of this. And it hits even if you never interrupt anything and even if you just keep your hands completely awake. The way we teach compound interest assumes the market is doing the heavy lifting from day one, investment growth, eight, 10% a year, all that sort of stuff. It isn't. In the early years, compound interest is absolutely invisible, essentially irrelevant to the topic of conversation. So let's look at the real numbers here, right? 300 pounds a month, again, 7% a year. At the end of year one, that's 114 pounds of growth. That's less than what? 10 quid a month, basically. Now, if you look forward to year five, five years of discipline and contribution, hard work, more than 83% of the money of the account balance that you have is just your own money, basically, the amount of money that you've put in. The eighth wonder of the world has earned you, let's say, less than 60 quid a month or something like that. So look, here's the uncomfortable truth. For roughly the first 10 years of your journey, how much you save, how much you contribute matters far, far, far, far, far more than the returns that you get, okay? Contributions do the heavy lifting for you. To tell young people to obsess over getting like 7% instead of 5% and all that sort of stuff. But early on, that 2% is just a rounding error, right? We tell people to boost their returns, to increase what they're getting in terms of return, but it just doesn't make a difference. Look, here's what I mean. So stick with 300 pounds a month for five years, chasing 7% instead of 5% leaves you about £1,000 better off. Double your contributions to £600 instead, and even at 5%, you're about £20,000 better off. That is what actually moves the needle. Earning more, saving more. Compound interest isn't a machine that creates wealth from nothing, right? It's a machine for multiplying wealth that you've already built. Until a year of market growth is bigger than a year of your contributions, you're not really at the behest of compound interest. You're not living off of the returns of compound interest. You're just living off of your own hard work and contributions. At £300 a month and 7%, let's have a look at when that crossover actually occurs, right? Usually right around year 10, once the pot passes about £51,000-ish, a full decade before the engine starts pulling the weight on its own, right? You've got to go through all that hard work, all that heavy lifting up until that point. Okay, so let's say that you are one of the rare ones, right? 30 years, never touched your investments, never paused, never deviated. There is still one more trap and one misconception about compound growth, and it's waiting for you right at the finish line, just as you're sort of wanting to take advantage of all of this. It is called sequence of returns risk or sequencing risk. Every investment brochure, every fact sheet, every person on YouTube, and I've done it in this video, quotes average annual return, right? So let's say in this case, 8%. Here's the thing though, markets don't hand you 8% a year every single year, like a bank account, for instance. Like if you have money in your bank account and they say, we're going to pay you 4% a year interest, you get 4% a year in a linear fashion, but the markets do not give you that. So let's say they give you a plus 22, minus 14, plus 5, minus 30, plus 18. Well, that is the average return is 8%, but the order in which it shows up is completely different. Now, if you've got a lump sum and you put it in the market and you never touch it, the order doesn't make a huge amount of difference. It can do, but it doesn't make a phenomenal amount of difference. The mass kind of comes out sort of the same either way. But the moment you start making, sort of taking money out or putting it in at random times, like you would do during retirement, the order starts to matter a lot. Let me tell you, like super, super matter, so much so that more so than investment returns. Let me show you what I mean. So let's take two investors, right? Both start with a hundred thousand pounds. Both take out 6,000 pounds at the end of each year for three years. Investor A gets plus 25, plus 10, minus 20 as their investment returns for those years. Investor B gets exactly the same returns, just in reverse order, right? Minus 20, plus 10, plus 25. Same three numbers, same average, completely different order. And that is the telling bit. Investor A finishes with 93,000 pounds. Investor B finishes with about 88,300. Look, they're nearly 6K-ish apart because Investor B took the hit in year one while they were effectively doing what we all should not do, which is sell at the bottom, right? So there was less left in the pot to take advantage and enjoy the recovery when it eventually came. And that's just three years, right? Stretch that out across, say, a whole retirement and the gap just gets bigger and bigger and bigger. This is an absolute killer. That average return in the investment document that you read hide what actually matters, I would say. The order of your returns in the five years, either side of retirement, can 100% decide whether your compound growth engine keeps running or just literally completely stalls out. It's so, so important. So here's the question then, with all that in mind, is compound interest useless, right? Is this notion of compound interest and sort of extrapolating these graphs out, and is it a myth ultimately? Well, no, obviously not. But we've just been using one tool for a job that constantly changes and adapts over time. When I looked at those profiles of those investors, what actually did succeed over those 15 years, a pattern genuinely jumps out at you when you see what worked. They didn't follow one smooth trajectory of a 40-year line. Typically, what happens is you move through three distinct stages. You've got to stop expecting the market to make you rich. It won't, not yet anyway. Take advantage of this. Your job in stage one is capital velocity, right? How fast can you turn your time and skills and your ability to make money into money that you can invest, right? Capital contributions. Let's say a 20% pay rise or finding an extra like 400 quid a month to save will genuinely do way, way, way more for your net worth than fiddling around with your asset allocation or picking a better fund, right? Or picking a fund with a lower percentage ongoing cost. In stage one, your biggest asset is your income, right? Your ability to funnel money in. It's not the compound interest growth miracle. But once you hit critical mass, the point where a year of market growth matches or at least comes close to beating a year of contribution, the game completely changes, right? Now, it's about optimization. It's about efficiency, right? So fees, platform cost, tax leaks, all of those things become the biggest threats to your money at this particular stage. This is where a tax-efficient account really, really starts earning its keep. So an ISA here in the UK or whatever tax-sheltered account exists where you live. Something that you can invest and have some sort of tax advantage where it's not going to have that tax friction to it. And fees, I don't think this is the be-all and end-all because it's linear and it assumes there's a couple of underlying assumptions. But this does matter way more than people genuinely think. So if you can cut your total costs from say 1.5% to half a percent on a 250 grand portfolio, well, look, that's £2,500 a year that stays invested in compounding every single year. Now, there's a nuance factor to that in terms of make sure it's exactly the same eggs for eggs thing that you're comparing it with. But yeah, only now, right, with a serious pot and like low optimized fees and your money sheltered from tax does pure compounding and pure maths actually take over, right? At this point, a single 5% move in the market can be worth more than your salary in a year. It becomes crazy. And this finally, finally is where the curve starts to look like the textbook, right? We got compound interest wrong because we treated it like a passive miracle, something that should do the work for us. It isn't a substitute for effort, right? It's a multiplier of effort. That's the key thing here. So stop waiting for time to do the work, grow your income, push your savings rate, cut the fees, cut the tax drag, build a critical maths. You've got to build the engine first. Then the maths will finally do what it's always promised for you. Now, all of this is super simple when you kind of lay it all out like that. But I think that's the problem. People misunderstand how simple and sometimes boring, frankly, building wealth can actually be. So the next thing that I really think that you should watch should really be this video here, because if you have any desire to reach retirement or at least kind of work optional status, then this will make things a whole lot easier for you. So give it a click and I will see you there.