SIPPs vs Workplace Pensions: Which Do You Actually Need?

Two routes to retirement savings, compared without the jargon.

What is a workplace pension and how does it differ from a SIPP?

A workplace pension is arranged by your employer. Money comes directly from your salary before tax, your employer adds a contribution (free money), and a pension provider invests it. You have limited choice over how it’s invested - you pick from a pre-selected set of funds, usually low-cost defaults. A SIPP (Self-Invested Personal Pension) is a pension pot you control yourself. You choose exactly what to invest in, from shares to bonds to property funds, and you manage it entirely independently.

The critical difference: a workplace pension comes with employer contributions in most cases. A SIPP doesn’t - you fund it yourself, though you do get tax relief on your contributions.

Why is employer contribution basically free money?

If your employer offers pension contributions, they’re legally required (under auto-enrolment rules) to contribute at least 3% of your salary if you contribute 5%. Many larger employers contribute more - sometimes 6%, 8%, or even 10%. This is salary you’d never receive in cash - it’s specifically for retirement.

A simple example: if you earn £30,000 and contribute 5% (£1,500), your employer must add at least £900. That’s £900 per year you’d never see otherwise. Over 30 years, that’s £27,000+ (not counting investment growth). You cannot replicate this benefit with a SIPP - no one’s matching your contributions.

This is why financial advisers universally say: if your employer offers a pension match, contribute enough to get the full match before considering anything else.

What about tax relief - how does it work for each?

With a workplace pension, tax relief is automatic. If you earn £50,000 and contribute £2,000, that £2,000 comes from your pre-tax income. Your taxable income drops to £48,000. For higher-rate taxpayers, the tax relief is even more valuable - you save 40% on every pound contributed.

A SIPP gives you tax relief too, but you claim it differently. You contribute after-tax money, then claim relief through your tax return or ask your tax office to refund it. Basic-rate taxpayers get 20% relief; higher-rate taxpayers get 40%. For most people, the relief appears automatically on their tax return if they’re registered as self-employed.

The net effect: both give you tax relief, but a workplace pension is simpler because it happens automatically.

How do fees differ between workplace pensions and SIPPs?

Workplace pensions are often very cheap. Many large employers negotiate bulk deals with pension providers, and the default investments frequently charge 0.3-0.5% per year. You don’t see these fees clearly - they’re deducted from your investment returns - but they’re genuinely low.

A SIPP gives you more choice, but comes with more costs. You typically pay an annual platform fee (£20-200+ depending on the provider), per-fund charges (0.1-0.8%+), and potentially dealing costs when you buy and sell. A SIPP with five carefully-chosen low-cost funds might total 0.4-0.6% annually, but poorly chosen SIPPs easily exceed 1.5% per year.

For most people under 40 years old with under £100,000 in pensions, a workplace pension will be cheaper than a SIPP.

Can you have both a workplace pension and a SIPP at the same time?

Yes, absolutely. Many people do. You contribute to your workplace pension to capture the employer match, then open a SIPP for additional retirement savings where you want more control over investments. Your combined contributions are limited by annual allowance rules (currently £60,000 per year), but for most people, this isn’t a practical limitation.

A typical approach: contribute 5% to your workplace pension to get the full employer match, then add £500-1,000 monthly to a SIPP where you have complete investment freedom. Both are tax-efficient, and together they diversify your retirement planning.

When does a SIPP make sense on its own?

A SIPP is your only option if you’re self-employed - you can’t have a workplace pension without an employer. Self-employed people also like SIPPs because they offer more investment flexibility and the ability to take a tax-free lump sum at retirement in ways workplace pensions don’t.

A SIPP also makes sense if you’ve left employment and built up multiple old workplace pensions. Rather than leaving money scattered across five different pension providers with five different investment menus, you can consolidate them into one SIPP where you manage everything centrally. This reduces the mental load and usually cuts fees.

For employed people, a standalone SIPP (without a workplace pension) is rarely the optimal choice - you’re giving up free employer money.

What is auto-enrolment and how does it work?

Auto-enrolment is UK law requiring employers to put employees into a workplace pension automatically. If you’re 22 or over and earn above £10,500 per year, your employer must enrol you into a pension (usually within a few months of starting work) and contribute at least 3% of your salary. You contribute at least 5%.

You can opt out if you want, but that means missing the free employer money. You can also adjust your contribution level up or down. The point of auto-enrolment is to nudge people into saving without making them think about it - and the evidence shows it works.

Where Mona Fits

If you’re employed, ensure you’re getting the full employer pension match first - that’s your guaranteed return. Then, for additional retirement savings beyond that or investments outside pension wrappers, Mona offers flexibility and transparency. You control your investments, see exactly what you’re paying, and maintain full transparency over growth and strategy. It complements a workplace pension rather than replacing it.

The Bottom Line

If you’re employed and your employer offers a pension, use it to capture the full employer match - it’s effectively a 100% instant return on your contribution, which no SIPP can match. After that, a SIPP makes sense for additional retirement saving where you want full investment control. If you’re self-employed, a SIPP is your main retirement vehicle. The wrong choice is skipping a workplace pension to avoid the contribution - that costs you far more in missing employer money than you save in fees.

Maximize your workplace pension match first, then explore additional savings. Start planning your complete retirement strategy today.

For impartial information and guidance on pensions, visit MoneyHelper.org.uk.

Join Mona’s early access waitlist

Join the waitlist

All articles

SIPPs vs Workplace Pensions: Which Do You Actually Need?

Two routes to retirement savings, compared without the jargon.

What is a workplace pension and how does it differ from a SIPP?

A workplace pension is arranged by your employer. Money comes directly from your salary before tax, your employer adds a contribution (free money), and a pension provider invests it. You have limited choice over how it’s invested - you pick from a pre-selected set of funds, usually low-cost defaults. A SIPP (Self-Invested Personal Pension) is a pension pot you control yourself. You choose exactly what to invest in, from shares to bonds to property funds, and you manage it entirely independently.

The critical difference: a workplace pension comes with employer contributions in most cases. A SIPP doesn’t - you fund it yourself, though you do get tax relief on your contributions.

Why is employer contribution basically free money?

If your employer offers pension contributions, they’re legally required (under auto-enrolment rules) to contribute at least 3% of your salary if you contribute 5%. Many larger employers contribute more - sometimes 6%, 8%, or even 10%. This is salary you’d never receive in cash - it’s specifically for retirement.

A simple example: if you earn £30,000 and contribute 5% (£1,500), your employer must add at least £900. That’s £900 per year you’d never see otherwise. Over 30 years, that’s £27,000+ (not counting investment growth). You cannot replicate this benefit with a SIPP - no one’s matching your contributions.

This is why financial advisers universally say: if your employer offers a pension match, contribute enough to get the full match before considering anything else.

What about tax relief - how does it work for each?

With a workplace pension, tax relief is automatic. If you earn £50,000 and contribute £2,000, that £2,000 comes from your pre-tax income. Your taxable income drops to £48,000. For higher-rate taxpayers, the tax relief is even more valuable - you save 40% on every pound contributed.

A SIPP gives you tax relief too, but you claim it differently. You contribute after-tax money, then claim relief through your tax return or ask your tax office to refund it. Basic-rate taxpayers get 20% relief; higher-rate taxpayers get 40%. For most people, the relief appears automatically on their tax return if they’re registered as self-employed.

The net effect: both give you tax relief, but a workplace pension is simpler because it happens automatically.

How do fees differ between workplace pensions and SIPPs?

Workplace pensions are often very cheap. Many large employers negotiate bulk deals with pension providers, and the default investments frequently charge 0.3-0.5% per year. You don’t see these fees clearly - they’re deducted from your investment returns - but they’re genuinely low.

A SIPP gives you more choice, but comes with more costs. You typically pay an annual platform fee (£20-200+ depending on the provider), per-fund charges (0.1-0.8%+), and potentially dealing costs when you buy and sell. A SIPP with five carefully-chosen low-cost funds might total 0.4-0.6% annually, but poorly chosen SIPPs easily exceed 1.5% per year.

For most people under 40 years old with under £100,000 in pensions, a workplace pension will be cheaper than a SIPP.

Can you have both a workplace pension and a SIPP at the same time?

Yes, absolutely. Many people do. You contribute to your workplace pension to capture the employer match, then open a SIPP for additional retirement savings where you want more control over investments. Your combined contributions are limited by annual allowance rules (currently £60,000 per year), but for most people, this isn’t a practical limitation.

A typical approach: contribute 5% to your workplace pension to get the full employer match, then add £500-1,000 monthly to a SIPP where you have complete investment freedom. Both are tax-efficient, and together they diversify your retirement planning.

When does a SIPP make sense on its own?

A SIPP is your only option if you’re self-employed - you can’t have a workplace pension without an employer. Self-employed people also like SIPPs because they offer more investment flexibility and the ability to take a tax-free lump sum at retirement in ways workplace pensions don’t.

A SIPP also makes sense if you’ve left employment and built up multiple old workplace pensions. Rather than leaving money scattered across five different pension providers with five different investment menus, you can consolidate them into one SIPP where you manage everything centrally. This reduces the mental load and usually cuts fees.

For employed people, a standalone SIPP (without a workplace pension) is rarely the optimal choice - you’re giving up free employer money.

What is auto-enrolment and how does it work?

Auto-enrolment is UK law requiring employers to put employees into a workplace pension automatically. If you’re 22 or over and earn above £10,500 per year, your employer must enrol you into a pension (usually within a few months of starting work) and contribute at least 3% of your salary. You contribute at least 5%.

You can opt out if you want, but that means missing the free employer money. You can also adjust your contribution level up or down. The point of auto-enrolment is to nudge people into saving without making them think about it - and the evidence shows it works.

Where Mona Fits

If you’re employed, ensure you’re getting the full employer pension match first - that’s your guaranteed return. Then, for additional retirement savings beyond that or investments outside pension wrappers, Mona offers flexibility and transparency. You control your investments, see exactly what you’re paying, and maintain full transparency over growth and strategy. It complements a workplace pension rather than replacing it.

The Bottom Line

If you’re employed and your employer offers a pension, use it to capture the full employer match - it’s effectively a 100% instant return on your contribution, which no SIPP can match. After that, a SIPP makes sense for additional retirement saving where you want full investment control. If you’re self-employed, a SIPP is your main retirement vehicle. The wrong choice is skipping a workplace pension to avoid the contribution - that costs you far more in missing employer money than you save in fees.

Maximize your workplace pension match first, then explore additional savings. Start planning your complete retirement strategy today.

For impartial information and guidance on pensions, visit MoneyHelper.org.uk.

Join Mona’s early access waitlist

Join the waitlist

All articles