If you are employed in the UK, you almost certainly have a workplace pension — auto-enrolment has made that the default since 2012. But you may also have, or be considering, a Self-Invested Personal Pension (SIPP). The two are not mutually exclusive: you can contribute to both, and the smartest strategy often involves doing exactly that.
This guide compares workplace pensions and SIPPs across the dimensions that matter — costs, investment choice, employer contributions, and flexibility — so you can decide where your retirement savings should live. This is general information, not financial advice.
What is a workplace pension?
A workplace pension is a pension scheme arranged by your employer. Since auto-enrolment, every eligible employee (aged 22 to State Pension age, earning over £10,000 per year) must be enrolled unless they actively opt out.
The key features:
- Employer contributions: Your employer must contribute at least 3% of your qualifying earnings. Many contribute more — 5%, 7%, or even 10%+ — as part of their benefits package. This is effectively free money added to your retirement savings.
- Your contributions: The minimum total contribution is 8% of qualifying earnings (between £6,240 and £50,270), including the employer's 3%. You pay at least 5%, though tax relief effectively reduces the net cost: a £100 contribution costs a basic-rate taxpayer £80 and a higher-rate taxpayer £60.
- Investment choice: Most workplace schemes offer a default fund (typically a diversified multi-asset fund with a "lifestyling" feature that shifts towards lower-risk assets as you approach retirement) and a limited range of alternative funds. You cannot buy individual shares or niche ETFs through a typical workplace scheme.
- Fees: Default fund charges are capped at 0.75% per year under auto-enrolment rules. Many schemes charge less — 0.30–0.50% is common.
What is a SIPP?
A Self-Invested Personal Pension (SIPP) is a pension you open and manage yourself, independent of any employer. The key difference is control: you choose the provider, the investments, and the contribution schedule.
The key features:
- Full investment choice: A SIPP lets you invest in individual UK and international shares, exchange-traded funds (ETFs), investment trusts, bonds, gilts, and — with some providers — commercial property. You can build a globally diversified portfolio of low-cost index trackers or pick individual stocks.
- No employer contributions: A SIPP is entirely self-funded. You can make personal contributions (receiving tax relief at your marginal rate) and, if you operate through a limited company, employer contributions from your company — but there is no third-party employer adding free money.
- Lower fees (usually): SIPP platform fees range from 0.15% to 0.45% of assets per year. Add a global tracker ETF at 0.07–0.20% and your total cost of ownership can be 0.22–0.65% — often cheaper than a workplace scheme.
- Consolidation: You can transfer old workplace pensions into a SIPP, bringing all your retirement savings under one roof with lower fees and better visibility.
Cost comparison: small differences, big impact
Fees matter enormously over a 30–40-year investment horizon. Here is what different fee levels do to a £200,000 pension pot growing at 5% per year (after inflation):
| Annual fee | Pot after 30 years | Lost to fees |
|---|---|---|
| 0.20% (low-cost SIPP + tracker) | ~£795,000 | ~£48,000 |
| 0.50% (typical workplace scheme) | ~£746,000 | ~£97,000 |
| 0.75% (auto-enrolment cap) | ~£707,000 | ~£136,000 |
A 0.30% annual fee difference — the gap between a low-cost SIPP and a typical workplace scheme — costs roughly £49,000 over 30 years on a £200,000 starting pot. That is real money.
But this comparison misses the single most important factor: employer contributions. If your employer contributes 5% of your £40,000 salary — £2,000 per year — that is £60,000 of free money over 30 years, before investment growth. No fee saving can match that.
Head-to-head comparison
| Factor | Workplace Pension | SIPP |
|---|---|---|
| Employer contributions | Yes — minimum 3%, often more | No (unless via own Ltd Co) |
| Tax relief | Yes — at source (relief at source) or net pay | Yes — basic rate at source; higher rate claimed via tax return |
| Investment choice | Limited — default fund + a few alternatives | Full — shares, ETFs, funds, bonds, commercial property |
| Typical total fees | 0.30–0.75% | 0.20–0.65% |
| Contribution flexibility | Via payroll — may be monthly only | Ad-hoc — lump sums, regular, or irregular |
| Consolidation of old pensions | Not typical | Yes — transfers in welcomed |
| Access age | 57 (rising to 58 in 2028) | Same |
| Default investment | Yes — lifestyle/profile fund | No — you must choose |
| Regulatory protection | FSCS + FCA | FSCS + FCA |
The optimal strategy: use both
For most employed people, the right approach is not "workplace pension or SIPP" — it is "workplace pension and SIPP", in that order:
Step 1: Maximise the workplace pension
Contribute enough to capture your employer's full matching contribution. If your employer matches contributions up to 5% and you earn £40,000, contributing 5% (£2,000, costing you £1,600 after basic-rate relief) secures an additional £2,000 from your employer. That is an instant 100% return on your contribution — no investment can match it. Not capturing the full match is leaving free money on the table.
Step 2: Contribute surplus to a SIPP
Once you have maxed out the employer match, any additional pension contributions are better directed to a SIPP. You get the same tax relief, but with lower fees, wider investment choice, and the ability to consolidate old pensions. This is especially valuable for higher-rate taxpayers, who can claim the additional 20% or 25% relief through their tax return.
Step 3: Consolidate old workplace pensions
Each time you change jobs, you leave behind a workplace pension. After three or four job moves, you may have half a dozen small pots scattered across different providers, each charging fees and each invested in a default fund you have not reviewed in years. Transferring these into a single SIPP reduces fees, simplifies administration, and lets you manage your retirement portfolio as a coherent whole.
When a SIPP alone makes sense
There are situations where a SIPP is the primary vehicle:
- You are self-employed or a contractor. With no employer to contribute, the workplace pension advantage disappears. A SIPP gives you the same tax relief with lower costs and full investment control.
- You want to invest in specific assets. If you want to hold individual shares, a commercial property, or a niche ETF, a workplace scheme will not accommodate you.
- You are a higher-rate taxpayer maximising relief. A SIPP gives you full control over contribution timing — you can make a lump-sum contribution in March once you know your total earnings for the year, claiming higher-rate relief through self-assessment.
When to stick with the workplace pension
- The employer contribution is generous. Some employers contribute 10% or more. Walking away from that to save 0.25% in fees is a poor trade.
- You prefer a hands-off approach. The default fund in a workplace scheme is designed for people who do not want to make investment decisions. A SIPP requires you to choose and manage investments.
- Salary sacrifice is available. If your employer offers salary sacrifice (where you give up salary in exchange for a pension contribution), you save both income tax and National Insurance — an additional 8% saving for a basic-rate taxpayer and 2% for a higher-rate taxpayer. This can make the workplace scheme cheaper than a SIPP even before the employer contribution.
The bottom line
The workplace pension wins on employer contributions — free money that no SIPP can replicate. The SIPP wins on costs, investment choice, and consolidation. The smart money uses both: contribute enough to the workplace scheme to capture every pound of employer match, then direct any additional retirement savings to a low-cost SIPP invested in a diversified global tracker. Consolidate old workplace pots into the SIPP as you move jobs, keeping your retirement portfolio lean, visible, and cheap.
A 0.25% annual fee saving may not sound like much, but over a 30–40-year career, it compounds into tens of thousands of pounds. Combined with employer contributions, it is the closest thing to a free lunch in UK personal finance.