Is it cheaper to use AI than to hire another member of staff?

You have more work than people. The next step looks like a job ad, but something nags at you: would software do most of this instead, for a fraction of the money? It is a fair question, and the honest answer starts with what each option costs once everything is counted.

What does hiring someone really cost?

The salary is the start, not the total. Even at the National Living Wage of £12.71 an hour, a full-time hire on 37.5 hours is around £24,800 a year. Add employer National Insurance at 15% and the minimum 3% pension contribution and you are past £28,000 before you have paid for recruitment, a laptop, software seats, holiday cover, or the months it takes a new person to get useful. Anything above entry level and the all-in figure climbs fast.

That money does buy you things AI cannot give you: judgment, accountability, and a person who notices the thing nobody asked them to notice.

What does AI cost?

Off-the-shelf tools, the AI receptionists, email drafters and booking bots, run at a monthly cost closer to your phone bill than a payroll line. A bespoke system built around your processes is a one-off project cost plus modest running costs. Either way, the gap against a salary is not close. We break the pricing down properly in our guide to what AI automation costs a UK small business.

What can AI not do?

AI does not replace a person. It replaces the repetitive slice of what a person would have done: answering the same enquiries, chasing the same invoices, moving data between systems, drafting routine emails, booking things in. In most admin-heavy roles that slice is big, sometimes most of the week. The rest, the judgment calls, the awkward phone conversation, the customer who needs a human, does not automate.

So the real question is not "AI or a hire". It is "what would this person spend their days doing". Write the job description you were about to post and sort the tasks into two piles: repetitive and rules-based, or judgment and relationships. If the first pile fills most of the week, automate it and you have probably saved yourself the hire, or at least delayed it until the business needs another brain rather than another pair of hands on a keyboard.

I will be blunt: if the role you are about to fill is mostly selling, managing people or making calls only you currently make, hire the person. Software that promises to replace judgment is lying to you.

Where do people get caught out?

• Buying a cheap subscription that covers a fifth of the workload, then hiring anyway. Now you are paying for both.
• Ignoring setup. The subscription is cheap; wiring it into how your business actually works is the real cost, in your time or someone else's.
• Automating a broken process. AI does a bad process faster. Fix the process first.
• Treating it as fire-and-forget. Someone still owns the system, checks its output and handles what it escalates. That is hours a week, not a salary, but it is not zero.

Counted properly, AI usually wins on cost for the repetitive work, and it never wins on the human work. Most growing businesses end up doing both: automate the admin now, and make the next hire about growth rather than coping.