Hiring guide
What a Staff Engineer Really Costs in 2026
Most hiring budgets are set on base salary. That is the number in the plan, the number in the offer, and the number founders quote each other. It is not the number that leaves the bank account, and at staff level the gap is large enough to matter.
Here is the arithmetic for 2026, using our own London band for staff and principal engineers of £120k–£150k. You can see how that band sits against the rest of the ladder in our salary benchmarks and the underlying dataset on our UK tech salary statistics page.
The on-costs nobody budgets for
Two costs land automatically on every UK employee, before anyone has bought a laptop.
Employer National Insurance is charged at 15% on earnings above a secondary threshold of £5,000 a year, and that threshold is frozen until April 2031. On a £135k offer that is £19,500. Not a rounding error.
Pension auto-enrolment sets a minimum employer contribution of 3% of qualifying earnings, which run from £6,240 to £50,270. Because that band is capped, the statutory minimum is about £1,321 a year on any salary above £50,270. It is the same for a £60k engineer and a £150k one.
Put together, across our London band:
| Base | Employer NI | Minimum pension | Total employment cost |
|---|---|---|---|
| £120,000 | £17,250 | £1,321 | £138,571 |
| £135,000 | £19,500 | £1,321 | £155,821 |
| £150,000 | £21,750 | £1,321 | £173,071 |
So roughly 15% on top of base, consistently across the band. If you pay pension on full salary rather than the qualifying band, which many scale-ups do at around 5%, the same £135k offer reaches roughly £161k and the uplift is closer to 19%.
One consequence worth noticing: the difference between a £120k offer and a £150k offer is not £30k. It is £34,500 once employer NI is included. When a candidate asks for another £10k late in a process, the real question is £11,500.
There is an offset. Employment Allowance can reduce an employer’s National Insurance bill by up to £10,500 a year, subject to eligibility. It applies per employer, not per hire, so it does not scale with headcount and should not be modelled into an individual role’s cost.
What you are actually buying
The band is the easy part. The harder question is whether the level is right, because “staff engineer” is the least standardised title in engineering. At one company it means a very senior individual contributor on one team. At another it means someone operating across the org, owning technical direction that no single team can own.
That ambiguity is expensive in both directions. Pay staff money for senior scope and you have overpaid by £20k a year plus on-costs. Hire a genuine staff engineer into a company with no cross-team problem to solve and they will leave inside a year, which costs far more than the band ever did.
The test we use when hiring software engineers at this level is simple: name the problem that spans teams and currently has no owner. If you can name it in one sentence, you need a staff engineer. If you cannot, you probably need a strong senior, or you need an engineering manager and the problem is coordination rather than architecture.
Acquisition cost sits on top
Everything above is the cost of employing someone once they have started. Getting them to start is separate: agency fees, the hiring team’s time, and the cost of the seat sitting empty. We break that down in how much it costs to hire a software engineer, and for roles at this level a retained search is usually the more honest structure, because the market is small and the search is genuinely a search rather than a shortlist.
If you are hiring in the capital specifically, our tech recruitment in London page covers what the local market is doing to these bands right now.
The short version
Budget base plus 15%, decide deliberately whether pension is paid on qualifying earnings or full salary, and spend more time on whether you need the level than on negotiating the last £5k of it. The level question is worth an order of magnitude more than the band question.
Salary bands are OpenSource’s own placement data for London, reviewed regularly. Tax and pension figures are the 2026/27 UK rates. Nothing here is tax advice; check your own position with an accountant.
FAQ
Frequently asked questions
What does a staff engineer cost a UK employer in 2026?
Budget roughly 15% above base before anything else. On our London band of £120k–£150k, employer National Insurance at 15% above the £5,000 secondary threshold adds £17,250–£21,750, and statutory minimum pension adds about £1,321. That puts a £135k offer at roughly £156k of employment cost, before recruitment, equipment or bonus.
Is a staff engineer more expensive than an engineering manager?
In our London data, slightly. Staff and principal engineers sit at £120k–£150k against £105k–£140k for engineering managers. The levels are not interchangeable though: one multiplies the output of a codebase, the other multiplies the output of a team, and hiring the wrong one for your problem costs far more than the difference in band.
Why does the pension cost barely move as salary rises?
Because the statutory minimum is 3% of qualifying earnings, which is capped at £50,270. Above that salary the minimum employer contribution is fixed at about £1,321 a year whatever you pay. Many scale-ups instead pay a percentage of full salary, which does scale, and that choice is worth making deliberately rather than by default.
How do we know if we need a staff engineer at all?
The honest test is whether you have a problem that spans teams and nobody owns it. If your senior engineers are already handling scope well within their own areas, a staff hire will be under-used and expensive. If decisions keep stalling between teams, that is the gap the level exists to fill.