Why founders usually underestimate first-year hiring cost
The most common headcount planning model in early-stage teams is simple: benchmark the salary, multiply by the number of hires, add a contingency, and move on. That model feels sensible, but it misses the fact that first-year hiring cost is not just salary plus statutory employer cost. It also includes the price of finding, equipping, onboarding, and absorbing the new employee into an existing team.
The smaller the company, the more damaging this mistake becomes. In a large employer, the recruitment process and onboarding burden are spread across specialist functions. In a startup, the same work is often done by the founder, hiring manager, lead engineer, and one or two overstretched teammates. Those hours are not free. They are simply hidden. For specialist roles in shortage, the drag is even heavier: the Ireland skills shortage index shows average time-to-hire running at 10 to 18 weeks for AI, cloud security, and platform engineering roles, which compounds every line item in the Year 1 cost stack.
Quick answer
If you are planning an €85,000 software engineer hire, it is safer to think in terms of a €111,000 to €119,000 first-year budget, not an €85,000 salary line. The gap is mostly recruitment, setup, and ramp-up.
The difference that matters
Salary: the gross pay on the offer letter.
Ongoing employment cost: salary plus recurring statutory and benefit cost.
Year 1 hiring cost: ongoing employment cost plus recruitment, setup, onboarding, and ramp-up overhead.
The hidden costs that show up before the hire is fully productive
These are the cost lines that most often get left out of first-pass budgets. They are also the lines that explain why the first-year number is consistently larger than employers expect.
Recruitment fee
Agency-sourced software engineering hires can add five-figure costs before the employee starts.
Typical range
Often 12% to 18% of salary
Hardware and setup
Laptop, monitor, security controls, peripherals, and software licences often hit immediately.
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
Ramp-up time is not a soft factor. It is a budgeting factor.
Many teams treat ramp-up as a performance issue when it is really a planning issue. A new software engineer does not become fully productive on day one. They first need to learn architecture, delivery norms, code ownership, internal tools, security rules, and how decisions get made. In lean teams, they also need time from other people to do that.
A practical way to think about this is to treat the first three months as a period of partial productivity, not full delivery. That does not mean the hire is failing. It means the employer should stop pretending the output is immediate. If the business case for the role only works when the person is productive in week one, the hiring plan is too optimistic. Roles requiring scarce specialisms take longer to ramp by definition: someone hired partly for expertise that is hard to find internally needs more time to transfer that knowledge, not less. The most in-demand tech skills in Ireland are also the ones with the steepest learning curve for surrounding team members.
Example first-year budgets at common Irish tech salary points
€60,000 hire
At this level, recruitment and setup can push Year 1 cost more than €10,000 above the steady-state employment number.
Ongoing annual cost
€69,000 to €73,000
Year 1 cost
€78,000 to €84,000
€85,000 hire
This is where agency fees and slow ramp-up start to become very noticeable in startup budgeting.
Ongoing annual cost
€98,000 to €105,000
Year 1 cost
€111,000 to €119,000
€110,000 hire
Senior hires look expensive not just because of salary, but because every surrounding cost scales with the role.
Ongoing annual cost
€126,000 to €135,000
Year 1 cost
€143,000 to €154,000
How to budget headcount more accurately in Ireland
A better hiring budget starts by splitting the question into two parts. First, what is the recurring annual employment cost once the person is in seat? Second, what will it take to get them there? That second question is where first-year overspend usually begins.
The cleanest planning approach is to model recurring cost separately from Year 1 cost, then add a realistic contingency for timeline slippage. If the team may need agency support, budget for it in advance. If onboarding depends heavily on one senior engineer, accept that some existing delivery capacity will be diverted. The budget should reflect reality, not the best-case scenario. If the role is short-term or uncertain, it is also worth modelling whether a contractor engagement could reduce Year 1 friction: the contractor vs permanent hiring cost comparison lays out when each route is the better employer-side decision.
Start with the broader employer cost view
If you need the recurring cost baseline first, read the full guide to software engineer employer cost in Ireland.
Best next step
Start with the recurring cost, then add your Year 1 assumptions
Use the employer cost calculator first, then layer in your agency, hardware, and ramp-up assumptions for a more realistic first-year plan.
Free tool
Model the recurring cost before you add the Year 1 layer
Use the calculator below to estimate the real annual employment cost, then layer your recruitment and setup assumptions on top for first-year planning.
Frequently asked questions
Why is first-year hiring cost higher than annual salary cost?
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 annual employment cost. For many Irish tech hires, that makes Year 1 materially more expensive than the ongoing cost of keeping the employee once established.
What is usually the biggest hidden Year 1 hiring cost?
For agency-led hiring, the recruitment fee is often the single largest hidden cost. For direct hiring, the biggest overlooked item is usually the value of manager and team time spent on sourcing, interviews, and onboarding.
How long does a software engineer typically take to ramp up?
It depends on the complexity of the environment, but three months to useful independence and up to six months to full productivity is a very common planning assumption. In complex codebases or regulated environments, it can be longer.
Do 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. The gap matters most for lean teams, where one delayed or underestimated hire can distort runway planning.
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