While the following content is intended to be educational, it does contain promotional material for Kaldi.

What does £50 buy you in this day and age? Not a whole lot is the answer, but put it away in your savings, and it can do something. Let’s take £50 a month, invested in a standard savings account between the ages of 25 and 65. You’re looking at £46,000 saved. Decent, right? But probably not enough to get you signing up for a savings account.

Now let’s take that same £50 a month and invest in a global index fund from age 25. It could be worth somewhere in the region of up to £419,000 by the time you're 65. And you don’t even need to choose the right stocks or get lucky. Just put it away every month and leave it alone. 

The difference between those two outcomes doesn’t rely on a certain set of skills or impeccable timing. It’s merely compound growth doing its thing. 

£50 a month, you say?

Let's use an investment calculator and be more specific. Based on the historical performance of the Vanguard LifeStrategy 100% Equity Fund, which is the kind of global index fund a beginner investor might choose through an app like Kaldi (more on us later),  here's what £50 a month, invested consistently, would look like over time.

At the 80th percentile of historical five-year rolling returns (roughly 11.5% annually, net of Kaldi's 0.15% fee):

• After 10 years: ~£10,800
• After 20 years: ~£42,800
• After 30 years: ~£137,900
• After 40 years: ~£419,700

At the 20th percentile (roughly 7.6% annually — the more cautious scenario):

• After 10 years: ~£8,800
• After 20 years: ~£27,100
• After 30 years: ~£65,000
• After 40 years: ~£143,800

Total returns are listed after fees. Figures shown show a range of possible outcomes based on historical performance of Vanguard LifeStrategy 100% Acc fund. Please go to kaldiapp.co.uk/example-fund for more information on this calculation. 

And what would £50 a month earn you in a standard cash savings account at 3% interest? About £46,000 after 40 years. Which, fine, isn't nothing. But it's also not £143,000 to £419,000.

The difference between those numbers is called compound growth. It is, as Einstein may or may not have said, the eighth wonder of the world. (He probably didn't say that. But someone did, and they were right.)

Yeah, but why £50?

Depending on your lifestyle, £50 per month is either completely achievable or an abstract concept from another universe. So let's not pretend everyone has it comfortably sitting there.

With an app like Kaldi, however, that £50 doesn't have to come entirely out of your monthly budget. We turn cashback from your everyday shopping into automatic micro-investments. 

A user can earn around £20 a month in cashback and round-ups on a normal £600 monthly spend (think your typical food shops, rounds at the pub, taxi rides, holiday bookings, etc). That's £20 that was already going to leave your account. 

If we put it another way, the difference between you investing £30 and you investing £50 might literally just be a cashback-enabled weekly shop.

Okay, but what even is compound growth?

We’re glad you asked, and we’ve written a lot about it here. But if you’re looking for a quick explainer, you invest £50. It earns a return (say 9% in a good year) so now you have £54.50. 

Next year, the 9% applies to the £54.50, not the original £50. You're earning returns on your returns. It snowballs slowly, then quickly, then in a way that makes you want to go back and shake your younger self for not doing it even earlier. 

The reason the 40-year numbers are so much bigger than the 20-year numbers is that the snowball has had longer to roll. In year one, compound growth does almost nothing. In year thirty-five, it's doing almost all the heavy lifting.

This is why every financial educator and that boring relative with a degree in economics agrees on starting early. It’s not about investing a lot, fast. Rather, the goal is to let time do its thing so the maths works out. 

Say I want to invest… how much should I go for?

There is no single right answer to how much to invest per month. The honest version is as much as you can without it causing you financial stress. If that's £10, fine. £10 a month earning a return over 40 years is still likely more than £10 a month under the bottom of a mattress.

What most investment calculators don't show you is that consistency matters more than the amount. A £50 monthly contribution that you maintain for 40 years beats a £200 monthly contribution you abandon after 18 months. The boring strategy wins.

This is partly why apps like Kaldi are designed the way they are – so you can set the amount, turn on auto-invest and let it happen. You don't have to remember or even manually transfer money every month. The investment takes place in the background while you're doing other things, like buying slightly too many things from Amazon.

The part nobody talks about

It should go without saying (but we’ll say it anyway) that numbers above aren’t guaranteed. We wish they were and that we could all swim our way through Scrooge McDuck’s money pit, but there is risk involved. The value of investments can go down as well as up, and market returns vary. Which is exactly why those projections show a range rather than a single figure. You might hit the 80th percentile outcome. You might hit the 20th. You'll probably land somewhere in between.

What's worth noting is that even in the more cautious scenario, £50 a month for 40 years turns £24,000 of actual contributions into nearly £144,000. The floor is still considerably higher than doing nothing.

Index funds spread your money across thousands of companies, which is part of why they tend to perform better over long timescales than most active fund managers. You're not betting on one company and putting all your eggs in the basket of, let’s say, Tesla. You're going on the general idea that the global economy does, over long enough time periods, go up. It has so far.

Right. So what do I actually do to get started? 

Great question, and it really is as simple as opening an account. Pick a risk level that doesn't make you anxious. Set an amount. Turn on auto-invest. Then, within reason, try not to look at it every day.

Is this where Kaldi comes in?

Kaldi lets you open a Stocks and Shares ISA, which keeps any returns free from UK income and capital gains tax, with as little as £1. You can choose from a range of funds including Vanguard LifeStrategy options, then set your monthly contribution, and let the app do the rest. The cashback from your everyday shopping is funnelled in on top. The round-ups from your spending round up to the nearest pound and go in too. It adds up faster than you'd think.

Fifty of your finest pounds

The point is not to find the perfect strategy before you start. Really, you just need to start. Every month you wait is a month's compound growth you don't get back. The numbers are patient. They'll wait for you. But they won't wait forever.

When you invest your capital is at risk. Past performance is not a reliable indicator of future results. The value of your investments can go down as well as up, and you may get back less than you put in. This article does not constitute financial advice. If you're unsure about investing or your personal financial situation, please speak to a qualified financial advisor.