The pros and cons of ISAs versus SIPPs

Want to know what’s best for you in the new tax year, an ISA or a SIPP? Read this.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

If there’s one thing governments are good at, it’s taking a simple thing and making it needlessly complicated. Take the Individual Savings Account (ISA). We’ve had the Stocks and Shares ISA, the Cash ISA, the Mini ISA, the Junior ISA, the Lifetime ISA

I’m investing to build a retirement pot, and the only one of those I reckon I need is a regular Stocks and Shares ISA.

I have a Self Invested Personal Pension (SIPP) too, also invested in UK shares. Why both? They offer tax advantages, but in different ways.

Tax-free profits

An ISA offers no tax relief on the money you invest. Instead, you don’t have to pay any tax on your gains when you eventually take money out. Dividends are generally paid with basic rate tax already deducted, but you won’t be eligible for any more tax when you cash in your ISA, no matter how much you’ve accumulated or what your tax band is.

Capital gains are tax-free too, no matter how much profit you’ve made. There are an estimated couple of hundred ISA millionaires in the UK these days, and HMRC is not going to get its hands on a single penny of their cash.

There are limits to the amount you can invest in an ISA, but the current allowance of £20,000 per year is substantial.

Tax relief on contributions

A SIPP works differently, and gives you tax relief on money when you put it in. As an example, for every £100 of gross salary you earn at the basic tax rate of 20%, you’d usually pay £20 in tax and be left with £80. But if you put that cash in your SIPP (or a company pension), the government will waive the tax on it and you’ll get to invest the full £100.

But there is a catch. When you eventually draw down your pension, it’s taxable. So what’s the point?

There are several benefits. Firstly, when you qualify for drawdown (currently at age 55, barring special circumstances like serious illness), you can take a lump sum of up to 25% of the total pot tax-free.

Then of the remainder, whatever you draw down each year falls under standard income tax rules. So, based on current tax bands, you can take £11,850 of pension income per year at zero percent tax.

Lower tax bands

Anything above that and up to £46,350 is taxable at the 20% basic tax rate, so you might think that’s the end of the benefits.

But if you were in the 40% higher rate bracket when you put your cash into your pension, you’d have enjoyed 40% tax relief at the time. And you’ll still only have to pay 20% tax on draw-down, provided you don’t take more than £46,350 per year.

Limits

There are tax-free contribution limits to pensions too, which includes SIPPS. There are some complicating factors — it is a government thing, after all. But generally, you’re able to contribute up to £40,000 per year with tax relief, providing the total doesn’t exceed your actual income.

There’s a lifetime limit too, currently of £1.03m, though I’ve not come close to that being a problem myself.

Now you know the tax benefits of ISAs and SIPPs, you can get your next tax year’s savings off to a great start.

Views expressed in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Abstract 3d arrows with rocket
Investing Articles

Up 25% YTD! Is this red-hot penny stock still ‘cheap’?

This penny stock has been on fire in 2026. Ken Hall takes a closer look at the investment story behind…

Read more »

Man smiling and working on laptop
Investing Articles

Stock market correction? A passive income opportunity!

Looking to turbocharge your passive income? The stock market correction could be a once-in-a-decade chance to do just that, says…

Read more »

Black woman using smartphone at home, watching stock charts.
Investing Articles

Are investors running scared of Babcock and BAE Systems shares?

BAE Systems shares have had a brilliant run, and other UK defence stocks have been flying too. But Harvey Jones…

Read more »

Mature black woman at home texting on her cell phone while sitting on the couch
Investing Articles

As the FTSE 100 falls, savvy investors are looking for stocks to buy for the rebound

Many FTSE stocks have now fallen 10% or more from their 2026 highs. For long-term investors, exciting opportunities are emerging.

Read more »

Portrait Of Senior Couple Climbing Hill On Hike Through Countryside In Lake District UK Together
Investing Articles

Should investors consider buying resilient Admiral Group and Tesco shares as markets wobble?

Harvey Jones is impressed by how Tesco shares have held up in the current market volatility, while Admiral has been…

Read more »

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

Down 15% in a month and yielding 7.5%! Should I buy even more of my favourite dividend stock?

Harvey Jones says this brilliant FTSE 100 dividend stock is suddenly cheaper due to recent market volatility. And the yield…

Read more »

Abstract bull climbing indicators on stock chart
Growth Shares

3 growth shares for an ISA that have beaten the FTSE 100 for the past 5 years

Jon Smith points out several growth shares that have outperformed the broader market over a long period of time, with…

Read more »

Calendar showing the date of 5th April on desk in a house
Investing Articles

Time’s running out for our 2025/26 Stocks and Shares ISA plans!

Never mind the stock market wobble, it's time to turn our attention to our Stocks and Shares ISA investments for…

Read more »