Most people’s relationship with their pension goes like this.

A workplace pension statement arrives once a year. It lists a number. The number goes up most years. You glance at it, file it somewhere, and go back to thinking about the other 11 months of your life.

That’s it. That’s the whole relationship.

Now, the number going up is good. But if that’s the sum total of your engagement with the most important tax wrapper the UK government has ever created, you are almost certainly leaving a significant amount of money on the table.

A pension isn’t a product. It’s a wrapper.

That’s it. That’s the whole concept. The pension industry has spent decades making it sound like something complicated — with jargon about “funds” and “lifestyle strategies” and “default options” — because if it sounded as simple as it actually is, nobody would pay them the fees they charge.

Here’s what a pension actually is: a tax-advantaged account you can hold investments inside. The investments do the work. The wrapper shelters them from tax.

Your workplace pension is one kind of wrapper. A SIPP — a Self-Invested Personal Pension — is another. The money inside can be the same money. The investments inside can be the same investments.

The difference is who gets to decide what those investments are.

In your workplace pension: it’s usually someone else.

In a SIPP: it’s you.

For the 2026/27 tax year, you can contribute up to £60,000 into your pensions (that’s all of them, combined, not per pension) and receive tax relief on the whole lot — provided you’ve earned at least that much. The standard annual allowance is £60,000.

Tax relief means the government tops up your contribution to reflect the tax you paid to earn that money in the first place. The rates are straightforward:

Let me say that again in case it didn’t land.

If you’re a higher-rate taxpayer, the government gives you, for free, forty pence of every pound you put into a pension.

Two reasons, and they compound.

First: most people’s only exposure to pensions is their workplace scheme. And workplace schemes, by design, give you very limited visibility and even more limited control. You fill out a form on your first day of work, you tick the default box because reading the alternatives feels like homework, and you don’t look at it again until retirement is actually visible in the distance. The industry likes it this way.

Second: the word “pension” has a specific emotional weight. It feels like something for retirement, which feels like something for later, which feels like something for a future version of you who you don’t yet have to worry about. The tax relief is invisible — you don’t see it hit your bank account the way you see a salary. Your employer’s contribution is invisible too. So it doesn’t feel like “money” in the way a bank balance or an ISA does.

The result is that the most powerful tax wrapper available to ordinary people in the UK is also the most underused.

I hold the same ETFs in my SIPP that I hold in my ISA.

That’s not a complicated strategy. It’s not a clever one. It’s just the observation that if a low-cost global equity ETF is the right long-term home for the money in my ISA, it’s also the right long-term home for the money in my SIPP. The investments don’t need to be different just because the wrapper is.

What changes is the tax treatment. My ISA grows free of income tax and capital gains tax, which is excellent. My SIPP grows in the same way — but I also got tax relief on the money going in, which is even better.

The only trade-off is access. ISA money I can touch whenever. SIPP money is locked away until at least 55 (rising to 57 from 2028). For the portion of your savings you genuinely won’t need until you’re older, that’s not a trade-off. That’s just the right wrapper for the job.

If you don’t have a SIPP yet, open one. The major UK providers — Interactive Investor, AJ Bell, Hargreaves Lansdown — all offer them. The account-opening process is similar to opening an ISA. You need your National Insurance number and a few details about your existing pensions. It takes about 20 minutes.

Once it’s open, you decide what to hold in it. If you don’t want to think too hard, a low-cost global equity ETF or an S&P 500 ETF is a reasonable default. It’s what I use. Your circumstances may differ.

If you have old workplace pensions from previous employers sitting around — the kind most people forget about entirely — consider whether transferring them into a SIPP would give you more control, more visibility, and lower fees. Sometimes it will; sometimes the old pension has valuable benefits that would be lost on transfer. This is a question to think carefully about before acting, and for some people it’s worth paying for one-off professional advice.

For the 2026/27 tax year, think about how much of your annual allowance you’ve already used through your workplace contributions, and whether you can top up directly to take more advantage of the tax relief.

You already know how to run an ISA. You can run a SIPP too. The mechanics are the same. The investments can be the same. The only thing that’s different is the tax treatment — and the tax treatment is in your favour.

Most people’s pensions are run by someone else, in funds they didn’t choose, charging fees they don’t see. That’s a default, not a decision. You can make a different one.

You’re probably already giving the taxman money you didn’t have to.

I am not a financial adviser. Nothing here is personal financial advice. Pension rules are complex and the right approach depends on your individual circumstances — particularly if you have old workplace pensions with guaranteed benefits, or if your earnings put you near the tapered annual allowance threshold. Tax treatment depends on your individual circumstances and may be subject to change. Please do your own research, and consider seeking qualified independent advice before making any pension transfers.