ISA insights: guides, investment ideas and tax tips

Whether you’re seeking income or growth, ideas for your children, or you want to learn the secrets of ISA millionaires, this resource has everything you need to help you make the most of this ISA season.

15th April 2025 13:25

Craig Rickman from interactive investor

As we edge into a new tax year, investors now have a fresh set of allowances, reliefs and exemptions to shelter their wealth from HMRC.

Making the most of individual saving accounts (ISA) has become even more important since last October after Rachel Reeves jacked up the rates of capital gains tax (CGT) at the Autumn Budget. The chancellor also opted to maintain the freeze on income tax thresholds until 2028-29, which will increase our tax bills as incomes rise – a tactic known as fiscal drag.

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The good news is that between now and 5 April 2026 you can invest a healthy £20,000 into an ISA and shield any future gains, dividends and interest from the taxman.

For those with young children, you can stick up to £9,000 into a Junior ISA (JISA) for each child under age 18. This is separate to your own allowance and can give your offspring a welcome financial leg-up once they reach adulthood.

Naturally, with 365 days on your side you may be tempted to wait until later in the tax year to invest into your ISA – especially considering the recent volatile stock market swings triggered by Donald Trump’s trade wars.

If you’re unsure what to invest in, or are nervous about the short-term trajectory of markets, it might be an idea to just stick to something like money market funds for now and make any decisions once you feel confident.

But regardless of how global stocks fare over the coming months – and we have little clue what will happen - historic data shows there are notable benefits to filling up your ISA allowance as soon as you can.

A study conducted by interactive investor three years ago found that early bird investors – those who invest at the start of the tax year and use the full allowance annually – could amass an extra £33,000 in 20 years’ time. This is significant sum to help you closer to your financial goals, or perhaps even enable you to surpass them.

Getting out of the traps early is a core tactic of many ISA millionaires, who are more than twice as likely to invest at the start of the tax year. The premise here is simple: the sooner your money is exposed to the stock market, the more time it has to grow. What’s more, you could also catch extra dividend payouts, further benefiting from the superpower that is compound returns.

The one sticking point for many of us is that we need to have sufficient cash sitting in current or savings accounts to tuck away for five years or more. While some investors do have the financial muscle to max out their ISA every year, for others it’s out of reach. It’s worth noting that for couples the allowance doubles up to £40,000.

However, you don’t need to fill your ISA allowance in one hit shortly after 6 April.

Investing what you have available (after keeping enough back for short-term financial commitments and emergencies) and drip-feeding money into your ISA every month, can be a prudent and balanced strategy.

The benefit of paying in regularly is that it mitigates some of the risk involved. The process of drip feeding, known in industry jargon as pound cost averaging, means you buy shares at different prices.

This can iron out the inevitable downs as well as ups that come with investing in stocks and shares – something we’ve been starkly reminded of in the past few weeks. It also means you won’t have to find as much to top your ISA up to the £20,000 max when 5 April rolls around again.

The drawback with regular investing compared to a single lump sum is that with less money in the market early, growth potential can be impaired. But of course, it all depends on how markets behave in the following months. That’s risk and reward for you.

With a new tax year now upon us, it can also be a good time to consider both your current and future investment choices. With thousands of funds and shares to choose from, narrowing down what’s right for you, your personal risk appetite and specific financial goals can be a tricky and time-consuming task.

But we’ve got you covered here. While our experts’ articles and tips should never be construed as investment advice, they may help steer you towards suitable investments that will enable you to grow your wealth over time without giving you sleepless nights.

A hand-picked selection of articles can be found below. And, as always, don’t forget to consider diversifying your ISA portfolio across a range of asset classes, regions and sectors to spread risk.

These articles are provided for information purposes only. Occasionally, an opinion about whether to buy or sell a specific investment may be provided by third parties. The content is not intended to be a personal recommendation to buy or sell any financial instrument or product, or to adopt any investment strategy as it is not provided based on an assessment of your investing knowledge and experience, your financial situation or your investment objectives. The value of your investments, and the income derived from them, may go down as well as up. You may not get back all the money that you invest. The investments referred to in this article may not be suitable for all investors, and if in doubt, an investor should seek advice from a qualified investment adviser.

Full performance can be found on the company or index summary page on the interactive investor website. Simply click on the company's or index name highlighted in the article.

Please remember, investment value can go up or down and you could get back less than you invest. If you’re in any doubt about the suitability of a stocks & shares ISA, you should seek independent financial advice. The tax treatment of this product depends on your individual circumstances and may change in future. If you are uncertain about the tax treatment of the product you should contact HMRC or seek independent tax advice.

AIM stocks tend to be volatile high-risk/high-reward investments and are intended for people with an appropriate degree of equity trading knowledge and experience.

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