SIPP vs Workplace Pension: How to Think About Both

By Neha Mehta, Chartered Accountant & Financial Coach

Most people treat their workplace pension as a set-it-and-forget-it box they ticked when they started a new job. And a SIPP (a Self-Invested Personal Pension) sounds like something only City types with spreadsheet hobbies need to worry about.

Neither assumption is quite right. As a financial coach working with UK professionals, I find that understanding both, and knowing when each one earns its place, is one of the highest-impact money decisions you can make. The two pensions aren't rivals. But they do different jobs.

What is a workplace pension, and why does it win by default?

A workplace pension is an employer-sponsored scheme, most commonly a defined contribution pension run through a provider like Nest, Legal & General, or Aviva. Since auto-enrolment became law, almost every employed person in the UK is in one.

The reason the workplace pension nearly always wins as a starting point is simple: employer contributions. Your employer is legally required to contribute at least 3% of your qualifying earnings on top of your own minimum 5%. That is an immediate 3% pay rise you cannot replicate anywhere else. Opting out of a workplace pension to run everything through a SIPP instead means leaving free money on the table, and no investment return is likely to compensate for that.

Contributions to workplace pensions are also low-effort. However, not all workplace pensions work the same way under the bonnet. Some schemes use salary sacrifice, where your contribution is deducted from gross salary before tax and National Insurance. This saves you NI on top of the income tax relief, which can be a meaningful extra benefit.

Others use relief at source, where contributions come from your take-home pay and HMRC tops up the tax relief separately. You still get full income tax relief either way, but you do not get the NI saving under relief at source unless you actively opt into salary sacrifice. Not all employers offer the option; some do but require you to request it. It is worth checking which method your scheme uses and, if salary sacrifice is available, opting in.

The downside of workplace pensions generally? You usually have limited fund choice, sometimes only a handful of options, and the default 'lifestyle' fund your pension lands in may not match your actual investment horizon or risk appetite. Many people have no idea what their pension is invested in at all.

What is a SIPP, and who is it for?

A SIPP is a pension wrapper you open yourself, independent of any employer, with a provider of your choice (Vanguard, Hargreaves Lansdown, AJ Bell, and others). You choose the investments inside it from a much wider universe: global index funds, bonds, ETFs, individual shares.

SIPPs still attract full pension tax relief. As a basic-rate taxpayer, an £800 contribution becomes £1,000 inside the pension after HMRC adds 20%. Higher-rate and additional-rate taxpayers can claim further relief via their Self Assessment return. This is something a good financial coach, or anyone with a thorough understanding of how the UK tax system fits together, will make sure you do not overlook, because many people miss it entirely.

A SIPP is particularly useful if you are:

• Self-employed with no access to an employer scheme
• A higher-rate taxpayer wanting control over where your money is invested
• Someone who has left multiple jobs and wants to consolidate old pensions into one place
• A business owner making employer contributions via a limited company (a very tax-efficient route I cover separately)

Can you have both? (Yes, and often you should)

The straightforward answer for most employed UK professionals is: contribute enough to your workplace pension to get the full employer match, then consider a SIPP for additional contributions if you want more investment control.

There is no rule against holding both simultaneously. Contributions to each count toward the same Annual Allowance (currently £60,000 gross per year, or 100% of earnings, whichever is lower), so you need to keep track of total contributions across all pensions. But for most people earning a typical professional salary, the Annual Allowance is not a binding constraint.

Where a SIPP really pays its way is for higher earners who want to reclaim higher-rate relief through Self Assessment, or for the self-employed who lack an employer contribution to chase.

The question to ask yourself

Before deciding how to split contributions, ask: what does my workplace pension actually do?

Log in. Find out the fund you're in, the charges you're paying, and what the default retirement age is set to. Also check whether you are enrolled via salary sacrifice or relief at source, and whether switching is an option. If you are in a well-run scheme with total charges coming to under 0.5% (that is good) and sensible fund options, there is no urgency to do anything more complicated.

If the charges are high, the fund choice is poor, or you are self-employed with no employer scheme at all, that is when a SIPP earns its place as your primary retirement vehicle.

A quick summary

Pensions are one of those topics where a small amount of clarity pays off for decades. If you are unsure which approach fits your situation, or you have accumulated pensions from several employers and are not sure what to do with them, this is exactly the kind of thing we work through together in a financial coaching session.

Neha Mehta is a Chartered Accountant and financial coach at Steady Steps Finance, helping UK professionals take control of their money.

This article is for informational purposes only and does not constitute regulated financial advice. For personalised financial advice, consult a regulated financial adviser.