Cash ISA Alternatives: Smarter Options for UK Savers

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On whether Cash ISAs are still worth it and why Cash ISA alternatives may be a better choice for UK savers.

First introduced in 1999, the Cash ISA quickly became one of the most popular savings tools in the UK.

With around 7.9 million people subscribing to them in the 2022/2023 tax year. This marks a 10% increase from the previous year.

This suggests that many savers see value in using them, even as alternative options gain traction. On top of that, the total amount subscribed to ISAs in that year was approximately £72.2 billion

This further highlights their ongoing appeal.

Out of those 7.9 million people, not one of them was me.

I don’t hold any money in a cash ISA, and I still don’t plan to.

Can 7.9 million people really be wrong?

Before we tackle cash ISA alternatives,

What is a Cash ISA?

A Cash ISA (Individual Savings Account) is a tax-free savings account available to UK residents. 

Unlike regular savings accounts, any interest earned in a Cash ISA is completely free from income tax. 

This makes it an attractive option for those looking to maximise their savings.

With an annual tax-free allowance (currently £20,000 per year), people see it as a smart way to shield their money from tax, especially before the introduction of the Personal Savings Allowance (PSA) in 2016.

Could Cash ISAs Disappear?

There have been recent discussions in the media about whether Cash ISAs are losing their relevance or could even be phased out. 

Recent reports suggest that some City firms are pushing for the government to cut tax breaks on Cash ISAs to encourage more people to invest in riskier assets like shares.

The argument behind this proposal is that Cash ISAs primarily benefit cautious savers, while the government and financial industry want to encourage greater investment in equities and other riskier assets.

By reducing the incentives for people to keep money in Cash ISAs, policymakers could push savers toward Stocks & Shares ISAs or direct investment in companies, theoretically boosting the economy.

This is obviously going to upset a lot of people dependent on Cash ISAs.

Personally, I believe there are better alternatives that offer similar or even superior benefits, depending on your financial situation.

Let me explain what I mean:

Why Do People Use Cash ISAs?

To explain why I don’t use it, first, we need to assess why people do use it.

So I asked on the Trading 212 community for your thoughts:

Despite the changing financial landscape, from what I can gather from the responses, people still turn to Cash ISAs for three main reasons:

  1. Somewhere to Keep Cash: A Cash ISA is seen as a safe place to store money, offering better returns than a standard current account.
  2. Tax-Free Interest: Since interest earned in a Cash ISA is never taxed, many people believe it’s the best way to protect their savings from HMRC.
  3. Safer Than Stocks & Shares ISAs: Unlike investing in a Stocks & Shares ISA, a Cash ISA isn’t exposed to market volatility, making it a relatively safer way to save than in stocks.

While these arguments seem logical, I believe they don’t hold up when compared to other options. Here are some of the cash ISA alternatives to know about.

Better Alternatives to the Cash ISA

1. Personal Savings Allowance (PSA) makes the Tax Benefit almost Redundant

From the responses, it seems like a few were not aware that UK taxpayers get a Personal Savings Allowance.

For basic-rate taxpayers, the Personal Savings Allowance (PSA) allows £1,000 of interest per year tax-free (£500 for higher-rate taxpayers).

  • At current savings rates (for simplicity’s sake, let’s say around 5%), you’d need £20,000+ saved in non-ISA accounts before even hitting the PSA limit. Then £10,000 for the higher rate taxpayers.
  • For most savers, this means their regular savings interest is already tax-free, making a Cash ISA’s tax benefit unnecessary.
  • Additionally, many high-interest savings accounts offer rates similar to or better than Cash ISAs, meaning that even for higher savings amounts, the benefit of a Cash ISA is minimal.

Now you might say, yes, I have more than 10/20 thousand pounds in my emergency fund, so I still need a Cash ISA.

2. Premium Bonds May Offer Better Returns

Premium Bonds are a savings product where, instead of earning regular interest, you are entered into a monthly prize draw for tax-free cash prizes.

  • The effective prize fund rate is currently 4.00% (as of Feb 2025), meaning that on average, Premium Bonds offer returns similar, slightly lower perhaps than Cash ISAs. However, unlike a guaranteed interest rate, returns depend on winning prizes, so some people may earn less or nothing at all.
  • The main advantage of Premium Bonds is their so-called guaranteed nature, as they are backed by the UK government and allow withdrawals at any time.
  • The returns from Premium Bonds are tax-free, meaning that for higher-rate taxpayers, the effective return can be even better than a regular savings account offering a similar rate. For example:
    • If a higher-rate taxpayer (40% tax bracket) has money in a standard savings account offering 5% interest, their after-tax return would only be 3%.
    • However, a Premium Bond holder achieving a 4.00% return keeps all of it, making it effectively better than a 5% taxable savings account for someone paying higher taxes.
  • For people who prefer a bit of excitement and don’t need a guaranteed return, Premium Bonds could be a more appealing option than a Cash ISA.

You might say, ok, Premium bonds having tax-free prizes is better, but we are talking about Cash ISAs, which are tax-free anyway.

Here is the nuance I would like to add. You are able to open and subscribe to both a cash ISA and a Stocks and Shares ISA in a tax year; however, the catch is that the £20k allowance is shared by both.

I believe it is better to fully utilise this allowance in the stocks and shares ISA.

3. A Stocks & Shares ISA typically Beats Cash in the Long Run

Many people turn to Cash ISAs to avoid the risks associated with investing in stocks. 

However, investing over the long term has historically provided much better returns than saving in cash.

  • Over the last several decades, stock markets have significantly outperformed cash savings, even accounting for market downturns.
  • While investments do carry risks, holding cash also has a less visible and prominent risk: inflation erodes the real value of your savings over time.
  • A Stocks & Shares ISA allows you to invest in a diversified portfolio of shares, bonds, and funds, helping to mitigate risk while still offering better potential returns than cash.
  • You can invest in a Stocks and Shares ISA  as well as a Cash ISA.

The Impact of Inflation on Cash ISA Returns

One of the biggest risks of keeping money in a Cash ISA for the long term is inflation. 

Even if you’re earning 4-5% interest per year, if inflation is running at a similar or higher rate, your real purchasing power isn’t increasing.

Inflation means that over time, the same amount of money will buy fewer goods and services.

If inflation is at 5% and your Cash ISA is only paying 4%, your savings are actually losing value in real terms.

Historically, stocks and other investments have outpaced inflation, while cash savings often fail to keep up.

For those who don’t need instant access to their funds, investing in assets that have historically outpaced inflation may be a better strategy than relying solely on a Cash ISA.

You can view a chart on Interactive Investor for a visual comparison between long-term cash savings with interest versus investing in the FTSE share index.

The chart highlights the power of long-term investing in stocks versus holding cash.

While cash provides stability, it grows less significantly over time.

Whereas investing in the FTSE All-Share index significantly outperforms during periods of market volatility. 

The difference is staggering. By 2022, ISA contributions invested in stocks had grown to £1.37 million, compared to just £591k in cash investments. 

This shows that even with stock market crashes, long-term equity investing has historically been the best way to build wealth.

This underscores the opportunity cost of holding too much in cash when investing for the future.

Final Thoughts

The Cash ISA isn’t completely irrelevant, but for many people, it’s possibly no longer the best choice. 

Personal Savings Allowance covers most savers’ tax needs.

Cash ISA alternatives like Personal Savings Allowance cover most savers’ tax needs, while Premium Bonds and Stocks & Shares ISAs offer better potential returns.

It might be time to rethink whether a Cash ISA is truly worth it.

I aim to maximise my ISA allowance but allocate all of that to stocks. 

The amount that I can put into Premium Bonds is more than enough as an emergency fund.

If I need cash at extremely short notice (ie, shorter than the 3 working days from Premium Bonds).

Then I am happy to use my personal allowance to receive interest outside of the ISA.

Of course, this is all theoretical, and your own choice may be completely different.