Here’s 1 key reason I think an ISA may be a better option than a SIPP for retirement

A Self-Invested Personal Pension (SIPP) is often the first account people consider when thinking about retirement. That makes sense, since the account is designed specifically for retirees (the word pension’s right there in the name).

But that doesn’t mean it’s right for everybody. The UK offers a range of investment accounts with various benefits, some of which may be more appropriate depending on individual circumstances.

Let’s have a look at how these accounts differ — and explore one key reason why some retirees may prefer a Stocks and Shares ISA.

Please note that tax treatment depends on the individual circumstances of each client and may be subject to change in future. The content in this article is provided for information purposes only. It is not intended to be, neither does it constitute, any form of tax advice. Readers are responsible for carrying out their own due diligence and for obtaining professional advice before making any investment decisions.

ISA vs SIPP

Unlike an ISA, a SIPP provides tax relief on contributions. However, in an ISA, any gains or dividends are free from tax.

But the key trade-off is access: ISA money can be accessed any time, while SIPP savings can’t be touched until age 55 (57 from April 2028).

For someone who might retire early, take a sabbatical, or simply want cash on hand, that access makes the ISA more flexible.

At the end of the day, whichever you choose, smart investment decisions are critical. So let’s look at one example of a basic retirement portfolio.

Planning for the long term

A popular retirement strategy includes 60% shares, 30% bonds and 10% cash. The idea is plain enough: shares aim to grow the pot, bonds help steady the ride, and cash gives you a buffer if markets wobble.

One of the most popular UK retirement holdings is FTSE 100 consumer goods company Unilever (LSE: ULVR), owner of in-demand brands such as Hellmann’s and Knorr. Established names like that help ensure steady cash flow to support regular dividends, currently 40.46p per share — a 3.73% yield.

In 2025, it delivered strong results:

• Underlying sales growth: 3.5%.
• Operating margin: 20%.
• Free cash flow: €5.9bn.

Still, reported turnover declined 3.8% because of currency impacts and disposals.

And that’s not the only concern. In March, the shares tanked 20% following an unpopular proposal to merge its foods division with NYSE-listed spice maker McCormick & Company. This suggests possible managerial friction and adds execution risks that could further impact the share price going forward.

Still, on a 20-30-year horizon, it exhibits the kind of low volatility and shareholder dedication that suits a retirement portfolio.

But why choose?

While I think an ISA is the preferable choice to a SIPP, there’s nothing stopping an investor from using both. Many people hold funds in both accounts to prepare for any scenario.

This gives you the best of both worlds — the flexibility of an ISA and the long-term tax benefits of a SIPP. Either way, planning for retirement means thinking long-term, so it requires more careful decision-making. 

When building an income-focused retirement portfolio, never rely on just one stock alone. A stable, highly-established business like Unilever is a good example of the type of stocks to consider – but it’s just one among a wealth of valuable blue-chips on the FTSE 100.

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Mark Hartley owns shares in Unilever.