Whitespace Global, a Belfast-headquartered AI company building technology for defence and national security clients, has announced 40 new jobs over the next three years, doubling its Northern Ireland workforce. The headline number is the average salary: £78,500. Read that as what it costs to hire one of these people and you are already short by more than £11,000, because employer National Insurance is not optional, does not show up on the job advert, and does not get smaller just because the role is skilled.
That gap between the salary on the offer letter and the real cost of the hire is not unique to Whitespace Global. It is the arithmetic every Northern Ireland employer runs into the moment they scale up headcount, and it catches out growing businesses more often than established ones, because a founder budgeting a first few senior hires is usually thinking in gross salary, not total employment cost.
What Invest NI actually announced
Whitespace Global is based on Linenhall Street in Belfast and builds Collective, an AI operating system that lets organisations develop, deploy and govern AI across cloud, edge and air-gapped environments while keeping control of their data, models and infrastructure. The company describes itself as building sovereign AI infrastructure for the UK's most sensitive environments, from classified and air-gapped systems through to heavily regulated markets. The 40 new roles span software engineering, AI/ML engineering, data engineering, cloud engineering, product management, and design and delivery consulting, recruited on a hybrid working model and advertised through the company's own careers page as they open.
Anne Beggs, Chief Commercial Officer at Invest NI, said the expansion is "a strong endorsement of Northern Ireland's growing reputation as a centre for advanced technology innovation," adding that Invest NI's "support secured the expansion in Northern Ireland." Ruth Hengari, Chief Financial Officer at Whitespace Global, said the company was founded in Belfast and "Northern Ireland is still where our ambition to scale lies," pointing to a recent Series A funding round and growing customer demand for Collective as the drivers behind the growth.
The number worth sitting with: £11,025
For the 2026/27 tax year, employer Class 1 secondary National Insurance is charged at 15% on everything an employee earns above a £5,000 secondary threshold, with no upper cap. On a £78,500 salary, that is 15% of £73,500, which comes to £11,025 a year, payable by the employer on top of the salary itself.
| Hiring one role at Whitespace Global's published average salary | Amount |
|---|---|
| Salary (the number on the job advert) | £78,500 |
| Employer secondary Class 1 NI, 15% above £5,000 | £11,025 |
| True annual employment cost | £89,525 |
Scale that across 40 roles at the published average and the employer NI bill alone comes to £441,000 a year once every post is filled, on top of a £3.14 million payroll — and that is before employer pension contributions, recruitment costs or any benefits package, none of which are included in this calculation. None of this makes the expansion a bad move; it is exactly the kind of investment Invest NI exists to encourage. It is simply the part of the story that a headline salary figure never shows.
Putting illustrative numbers on a smaller hire
Few Northern Ireland businesses are hiring at Whitespace Global's scale, so it is worth putting the same arithmetic against a business closer to Buzz's own client base. Say a nine-person Belfast software consultancy, with no other employer National Insurance liability yet this year, takes on two mid-level developers at £48,000 each — a realistic Belfast tech salary, entirely illustrative and not connected to any real business.
| Illustrative nine-person Belfast consultancy hiring two developers at £48,000 | Amount |
|---|---|
| Combined gross salary, two hires | £96,000 |
| Employer NI before Employment Allowance | £12,900 |
| Employment Allowance, 2026/27 (if eligible) | −£10,500 |
| Employer NI actually payable | £2,400 |
If this consultancy has no other employer NI liability for the year and qualifies for Employment Allowance, the true cost of the two hires is £98,400 rather than the £96,000 an owner might budget from salary alone — a much smaller gap than Whitespace Global faces, purely because Employment Allowance shelters the first £10,500 of the bill. Whitespace Global, an established employer already doubling an existing workforce, is very unlikely to still be within that allowance; a business making its first sizeable hire often is.
What it means for a Northern Ireland employer specifically
If you are budgeting a hiring round, work from the total employment cost, not the salary you are advertising. Two things determine how big the gap is: how far above the £5,000 secondary threshold the salary sits, and whether Employment Allowance is still available to you. Employment Allowance does not apply where a company's sole director is its only employee earning above the threshold, and it stops being available at all once a business's employer Class 1 NI bill for the previous tax year reaches £100,000 — a threshold most businesses only cross once they already have a reasonable-sized payroll. Check your own position before assuming the allowance will soften a new round of hiring.
What to do this week
Before extending an offer at a similar salary level, model the full employer cost, not just the gross figure — our payroll service can run that calculation against your specific payroll position before you sign anything. If you have not checked whether your business still qualifies for Employment Allowance, do it now via gov.uk's Employment Allowance guidance, since the £100,000 prior-year threshold catches out growing businesses that assumed it still applied. If Invest NI or council backing might apply to your own expansion plans, Invest NI's Ambition to Grow programme is the current route for scale-up support, distinct from the sector-specific programme behind this announcement.
For how a different Invest NI jobs announcement broke down in practice, see our piece on what a headline Invest NI figure actually covers in the Derry jobs story, and on the wider trend behind this one, Northern Ireland's AI economy doubling in size.
What is still uncertain, and when we'll know
Invest NI's release does not state the size of its own financial contribution to this expansion, only that its "support secured" it — a gap compared with announcements like Invest NI's Encirc training grant the same month, which gave an exact figure. Nor does it break down how the 40 roles are phased across the three-year period, or how the £78,500 average splits across six different role types that will not all pay the same. The clearest way to track actual progress is Whitespace Global's own careers page as roles are advertised and filled, and the company's future Companies House filings, which will eventually show whether headcount growth tracks the pace Invest NI announced on 30 September 2026.
Getting the true cost of a hiring round right before you make an offer, not after the first payslip, is exactly what our payroll service is built for, and our tax planning team can confirm whether Employment Allowance still applies to your business before you rely on it.