Key facts at a glance
£85K hire, Year 1 budget
£116K-£125K
Not the £85,000 on the offer letter
Typical recruitment fee
15%-25%
Of first-year salary, agency-sourced
Time to full productivity
3-6 months
Ramp-up is a budgeting factor, not a soft one
Here is the answer before the breakdown: an £85,000 UK software engineering hire needs a £116,000 to £125,000 first-year budget, not an £85,000 salary line. The gap is not Employer National Insurance or pension, those are already priced into the recurring annual cost. It is recruitment fees, hardware and setup, and the months it takes a new hire to reach full productivity, three cost lines that almost never make it into a first-pass headcount plan.
Most founders do not underbudget salary. They underbudget everything around the salary. The smaller the company, the more this mistake costs: a large employer spreads recruitment and onboarding across specialist functions, while a startup often has the founder, hiring manager, and one or two overstretched engineers absorbing that work directly, hours that are not free even though they never appear on an invoice.
Start with the recurring cost baseline, then layer your Year 1 assumptions on top.
Open the calculatorSalary, recurring cost, and Year 1 cost are three different numbers
Salary is the gross pay on the offer letter. Recurring employment cost adds the statutory and benefit layer that sits on top every year: Employer National Insurance (15% above the £5,000 secondary threshold), auto-enrolment pension, and any health cover or equipment allowance, covered in full in our true cost to hire guide.
Year 1 cost adds a third layer on top of that recurring figure: recruitment, hardware and setup, and ramp-up. None of these repeat in Year 2 at the same level, which is exactly why treating Year 1 and ongoing cost as the same number produces a headcount plan that is too optimistic from the very first hire.
The hidden costs that show up before the hire is fully productive
Recruitment fee
Agency-sourced software engineering hires routinely add five-figure costs before the employee starts.
Typical range
Often 15% to 25% of salary
Hardware and setup
Laptop, monitor, security controls, peripherals, and software licences typically land in week one.
Typical range
Roughly £1,500 to £3,000
Onboarding time
Productivity is lower while the employee learns systems, tools, codebase, and team norms.
Typical range
Usually the first 2 to 6 weeks
Manager and team time
Interviews, scorecards, onboarding, code reviews, and shadowing all consume existing team capacity.
Typical range
Often undercounted completely
Ramp-up lag
Even strong hires usually take time to reach full output, especially in complex product environments.
Typical range
Commonly 3 to 6 months
Example first-year budgets at common UK tech salary points
| Hire | Ongoing annual cost | Year 1 cost |
|---|---|---|
| £60,000 hire | £72,000 to £76,000 | £81,000 to £88,000 |
| £85,000 hire | £103,000 to £109,000 | £116,000 to £125,000 |
| £110,000 hire | £132,000 to £141,000 | £149,000 to £160,000 |
Ongoing cost assumes standard Employer NI and 3% auto-enrolment pension. Year 1 assumes a 20% agency recruitment fee plus hardware and setup. Model your own recurring baseline on the UK Startup Team Budget Calculator.
Ramp-up time is a budgeting factor, not a soft factor
A new software engineer does not become fully productive on day one. They first need to learn architecture, delivery norms, code ownership, internal tools, and how decisions get made, and in lean teams they also need time from other people to do that. A practical planning assumption is to treat the first three months as partial productivity, not full delivery. If a hiring business case only works when the person is productive in week one, the plan is too optimistic, particularly for scarce specialisms, where the same expertise that made the hire hard to find also makes the knowledge transfer take longer.
How to budget headcount more accurately
Split the question into two parts. First, what is the recurring annual employment cost once the person is in seat, salary, Employer NI, pension, and benefits? Second, what will it take to get them there? That second question is where first-year overspend usually begins, and it deserves its own line in the budget rather than being absorbed into a vague contingency.
If the role is short-term or the need is uncertain, it is also worth modelling whether a contractor engagement reduces Year 1 friction. Our true cost to hire guide lays out exactly when a contractor is the cheaper route and when it stops being one.
Model your recurring team cost first
Add roles, set London or regional rates, and get the full ongoing Total Cost of Employment baseline before layering in Year 1 assumptions.
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Frequently asked questions
Why is first-year hiring cost higher than annual salary cost in the UK?
Because Year 1 includes costs that do not repeat at the same level every year. Recruitment fees, hardware, setup, onboarding time, and ramp-up all sit on top of the employee's normal ongoing employment cost, which already includes Employer National Insurance and pension. For many UK tech hires, that makes Year 1 materially more expensive than the cost of keeping the same employee once they are established.
What is usually the biggest hidden Year 1 hiring cost in the UK?
For agency-led hiring, the recruitment fee is often the single largest hidden cost, typically 15-25% of first-year salary for a mid-to-senior technical hire. For direct hiring without an agency, the biggest overlooked item is usually the value of manager and team time spent on sourcing, interviewing, and onboarding, hours that come straight out of existing delivery capacity.
How long does a software engineer typically take to ramp up in a UK team?
It depends on the complexity of the environment, but three months to useful independence and up to six months to full productivity is a common planning assumption. In complex codebases, regulated environments (finance, healthcare), or roles requiring scarce specialisms, ramp-up commonly runs longer, since the surrounding team also needs to absorb knowledge transfer time.
Do UK startups need to budget separately for Year 1 and ongoing cost?
Yes. If you only budget steady-state annual employment cost, your first-year headcount plan is likely to be too optimistic, and the gap compounds across every hire in a lean team's plan. The safer approach is to model recurring cost (salary, Employer NI, pension, benefits) separately from the one-off Year 1 layer (recruitment, setup, ramp-up), then combine them for a realistic first-year figure.
How much does UK Employer National Insurance add to the recurring cost baseline before Year 1 costs are even added?
Roughly 15% of salary above the £5,000 secondary threshold as of the October 2024 Budget changes (effective April 2025), which is why the recurring annual cost figures in this guide already sit well above the headline salary before any recruitment or onboarding cost is added. Get the recurring baseline right first: it is the foundation the Year 1 figure builds on.
Should a startup use a contractor instead to avoid the Year 1 cost spike?
It depends on how long the need lasts. A contractor sidesteps recruitment fees and much of the onboarding overhead for a short, defined engagement, but the day rate itself is priced to reflect that. For an ongoing role, a permanent hire's Year 1 cost, while higher upfront, is normally still cheaper than 12 months of contractor engagement once the crossover point is passed, typically somewhere between 4 and 6 months.
Does the recruitment fee percentage vary by role seniority in the UK?
Yes, and it tends to rise with seniority and scarcity, not fall. Senior and specialist roles (platform engineering, security, AI/ML) often carry recruitment fees at the higher end of the 15-25% range, or above it for particularly hard-to-fill positions, because agencies price their fee against both the difficulty of the search and the salary it is a percentage of.
How does this compare to the equivalent Year 1 cost picture in Ireland?
The mechanism is the same: recruitment fees, setup, onboarding time, and ramp-up all apply in Ireland too, but the specific percentages and the underlying recurring cost baseline differ, since Irish employers pay Employer PRSI rather than Employer NI, at different rates and thresholds. If you are budgeting hires across both markets, run each country through its own recurring cost baseline rather than applying one country's assumptions to the other.
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