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

ISAs often get written off as something for older generations, usually lumped in with sensible shoes and Sunday supplements. Now, before we continue, you might be asking yourself what even is an ISA? We’ll get there; don’t worry. But for now, the idea of any ISA being something the elders do kind of misses the point. 

A good ISA is about so much more than playing it safe or waiting for retirement, as it gives your money some breathing room in the here and now. It means the everyday choices you make today work harder for you in the future.

So join us as we make ISAs interesting and tell you why they can help build wealth. 

What is an ISA?

In its simplest form, an ISA is a tax-efficient wrapper for your money. ISA stands for Individual Savings Account, but the interesting part isn’t the name. It's what happens inside it. The wrapper is just what protects your savings from tax.

Any interest you earn, or gains your money makes, are sheltered from tax. There’s no income tax on interest, capital gains tax on growth or any pesky forms to fill in every year to declare it. Once your money is in an ISA, whatever it does in there is yours to keep.

There are a few different types, but they all work on the same principle. 

• A Cash ISA holds savings and earns interest. 
• A Stocks and Shares ISA lets your money be invested in things like funds or shares, with the aim of growing it over time. 

You can add money up to the annual ISA allowance each year (currently £20,000, although from 6 April 2027 the amount that can be paid into a Cash ISA will be capped at £12,000 for those under 65, while the overall £20,000 ISA limit remains). On the plus side, the allowance resets every April.

It’s also worth knowing that the allowance applies across all of your ISAs combined. Since the rules changed in 2024, you can pay into multiple ISAs with different providers in the same tax year, including more than one of the same type, as long as your total contributions don’t go over the annual limit. That means having an ISA elsewhere doesn’t automatically rule out opening another one.

The important thing to know is that an ISA isn’t a product in itself. It’s a container. And if you’re wondering what that means, it simply decides how your money is treated instead of how it grows. The choices you make inside the ISA are what really shape the outcome, whether that’s with one provider or spread across several.

Tell me about the different ISAs

There is more than one kind of ISA, and they are designed for different ways of saving and investing. The main difference between them is what your money is used for and how much risk you are comfortable taking on. Here is a simple way to think about each one.

Cash ISA

A Cash ISA is the most straightforward option. Your money sits in cash and usually earns interest. You don’t pay tax on what it earns either. It works much like a savings account, only with the tax benefit added on top.

People tend to use Cash ISAs for money they might need sooner rather than later, or for savings they want to keep stable without worrying about ups and downs.

Stocks and Shares ISA

A Stocks and Shares ISA is for investing rather than saving. Your money is put into things like funds, shares or bonds, with the aim of growing it over time. Because markets go up and down, the value can rise or fall, especially in the short term.

This type of ISA is usually better suited to longer-term goals, where you can give your money time to ride out changes and potential market volatility.

Lifetime ISA

A Lifetime ISA is designed for specific life goals. You can use it either towards buying your first home or for later life, once you reach retirement age. The government adds a bonus to what you put in, which is what makes it different from other ISAs.

There are rules about when you can take money out, and penalties if you use it for something else. It works best when you are clear about what you are saving for.

Innovative Finance ISA

An Innovative Finance ISA lets you earn returns by lending money through platforms such as peer-to-peer lending. Instead of interest from a bank or growth from markets, your return comes from borrowers paying you back with interest.

It can offer higher potential returns, but it also carries more risk, because your money depends on borrowers repaying what they owe.

So ISAs aren’t boring, then?

They most certainly are not. Practical, maybe. But not boring. Think of an ISA as a good place for money to hang out while life carries on around it. There’s no pressure to get it right or having to wait for the right moment to invest. Your money arrives and gets to work right away.

It’s even better when investing is tied to everyday habits (more on that shortly), as it stops feeling like a ‘finance thing’ and more like an everyday ‘I don’t even need to think about this” thing. That’s when ISAs click into place and fit into your life while doing something helpful so you can get on with it. 

And I can save some serious money with an ISA?

The short answer is yes, over time it can make a real difference. Put £50 a month into an ISA for 20 years and you’ll have added £12,000 yourself.

If that money sat in a Cash ISA earning around 3% a year, it could grow to roughly £16,400. Invested through a Stocks and Shares ISA instead, using an illustrative equity fund example, historical annual returns have ranged between 7.57% and 11.49%. At those levels, the same £50 a month could grow to somewhere between approximately £27,900 and £46,100 over 20 years.

The key difference is that the growth stays inside the ISA instead of being chipped away by tax. That’s how steady habits start to add up.

Past performance is not indicative of future results. Markets move, values go up and down, and you could get back less than you invest. 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. Total returns are listed after fees.

I don’t have a lot of money to spend. Is it even worth starting?

Most people don’t wake up one day with £20,000 ready to drop into an ISA. Money usually builds in smaller ways, like a bit left over at the end of the month or spare change from everyday spending. It might even be cashback that would otherwise disappear back into your balance.

Instead of interest being chipped away later or gains becoming something you have to think about, everything stays together in one place with an ISA. It basically gives it somewhere sensible to go. You don't have to keep checking rules or doing anything differently. Your money has the space to add up over time.

It works because the money you’re already putting aside has somewhere sensible to land, where it can build up naturally from the moment it arrives.

Where Kaldi fits into the world of ISAs

Kaldi uses the same ISA wrapper you’d get elsewhere, with the difference being how money finds its way in. Instead of relying on large deposits or being ultra disciplined, Kaldi links investing to what you’re already doing. 

When you shop at one of our 160+ brands, the cashback you earn flows straight into your account. During your daily spend, you can choose round-ups to add a little more and even contribute some of your own money. That money can then sit inside an ISA, growing tax-efficiently over time. It’s the familiar ISA structure, only fed in a way that feels more natural and far easier to stick with.

How Kaldi invests your money

Kaldi doesn’t pick individual shares or try to outsmart the market. Instead, when you set up a Stocks and Shares ISA in the app, you choose from a small range of diversified funds, including money market funds and low-cost index funds. 

Your cashback, round-ups and top-ups land in your Savings balance first, then move into your chosen fund within your ISA when you invest. You can switch on auto-invest to transfer money monthly once your balance reaches £20. Before investing, you’ll answer a short questionnaire so you’re sure investing is right for you.

An ISA that fits in with your life

An ISA doesn't need constant attention to be worthwhile. It mostly needs time. When money can be added little by little and then left alone, it has room to grow without becoming something else you have to manage. That’s the advantage most people miss.

Capital is at risk when investing. The value of your investments can go up or down, and you may get back less than you put in. Kaldi doesn’t offer personal financial advice, so if you’re unsure whether investing is right for you, it’s worth speaking to a qualified financial adviser.

Download Kaldi and set up an ISA in minutes. Start turning everyday spending into long-term investing