NHS Pension vs Private Pension (SIPP): What's the Real Difference?

This comparison comes up constantly for NHS staff weighing additional saving, considering a move to the private sector, or just trying to understand what their pension is actually worth in terms they can picture. The honest answer isn't "the NHS Pension always wins" or "a SIPP always wins" — it's that the two are built on fundamentally different structures, each with genuine strengths, and the right comparison is a capital-value one, not a vibes-based one.

This is independent guidance, not financial advice — FrontlinePay is not affiliated with NHS England, NHS Pensions or the Department of Health and Social Care, and nothing here is a recommendation to keep, transfer, or stop contributing to any pension.

Defined benefit vs defined contribution: the core structural difference

Every other difference between the NHS Pension and a SIPP flows from this one structural split. The NHS Pension Scheme's 2015 Section is a Career Average Revalued Earnings (CARE) defined benefit scheme: every scheme year, you bank 1/54th of that year's pensionable pay as a slice of guaranteed annual pension, which is then revalued (modelled here at CPI+1.5%, a 2.5% long-run planning assumption) until you draw it — see our full NHS Pension Scheme (2015) explained guide for the mechanics. The amount is a promise, not a projection: whatever happens to investment markets, that's what you're owed.

A SIPP (Self-Invested Personal Pension) is a defined contribution arrangement. Money goes in — your own contributions, plus tax relief, and employer contributions if your SIPP is used as a workplace pension — and is invested in funds, shares or other assets you choose. What you eventually have depends entirely on contributions paid in and investment performance along the way. There's no promised amount, and no employer or taxpayer standing behind a shortfall if investments underperform.

What NHS Pension income would actually cost to replicate privately

Because a DB pension pays an income rather than showing you a pot balance, it's genuinely hard to picture in cash terms — which is exactly why members routinely undervalue it against a private-sector salary or a SIPP. Take a member aged 45 on £35,000 of pensionable pay, with 23 years to a Normal Pension Age of 68 (their State Pension age), and no further real pay growth modelled. Using the 2015 Scheme's real accrual and revaluation mechanics:

Projected pension at Normal Pension Age: £19,823.24 a year.

To express that as a capital value, this site uses the same 20:1 factor HMRC itself uses to value pension income for lump sum allowance purposes — not an invented multiple:

£19,823.24 × 20 = £396,464.8 capital-value equivalent.

To see how much extra growth the cash from opting out would need to earn to match the NHS pension it replaces, use our free NHS Pension Opt-Out Calculator.

Where a SIPP genuinely wins

None of the above means a SIPP is the "losing" option — it has real, structural advantages the NHS Pension doesn't offer, and a genuinely balanced comparison has to name them plainly:

• • Full control over investment choice and strategy — you choose the funds, shares or assets, and can take more or less risk than the NHS Pension Scheme's own investment approach would ever expose you to, for better or worse
• • Flexible access — a SIPP can generally be accessed from the Normal Minimum Pension Age (currently 55, rising to 57 from 6 April 2028) however you like: a lump sum, flexible drawdown, or buying an annuity — not tied to your State Pension age the way the 2015 Scheme's Normal Pension Age is
• • No actuarial reduction mechanic — drawing a SIPP earlier doesn't apply a scheme-wide percentage cut the way taking the NHS Pension before Normal Pension Age does; what you draw is simply your own money, on your own terms (within tax rules)
• • Full portability — entirely independent of any employer, so it isn't tied to continued NHS service in any way
• • You set the contribution level each year, within the Annual Allowance, rather than being tied to a scheme's fixed accrual formula

For someone with a short expected NHS career, significant existing pension savings already filling their Annual Allowance, or who simply values flexibility and control over guaranteed income, these are genuine, not trivial, advantages — not every member's circumstances point toward "maximise the DB scheme at all costs."

Access age, death benefits and the 2027 inheritance tax change

Two further differences are worth understanding precisely, because they're both changing in the next couple of years and a lot of existing commentary online is already out of date.

Can you have both?

Yes — and for most actively employed NHS staff, this is the realistic middle ground rather than an either/or choice. Staying in the NHS Pension Scheme for your main defined benefit, while separately saving into a SIPP (or the scheme's own in-house AVC option) for additional, flexible saving on top, lets you keep the guaranteed inflation-linked core while still building some assets with SIPP-style flexibility and access terms. See our dedicated Should I Max Out My NHS Pension or Invest Elsewhere? guide for how to think through that specific trade-off, and our NHS Pension AVCs Explained guide for the in-scheme alternative to an external SIPP.