How much does AI cost for a small business?

The short answer. Using AI can cost a small business anything from nothing to tens of thousands of pounds, depending on what you want it to do. Off-the-shelf tools like ChatGPT or Microsoft Copilot cost a monthly fee per person. Connecting AI to your own systems costs more, either as a one-off build or as usage charges. The costs people forget are running costs, staff time and maintenance. Whatever the price, the useful number is payback: how many months of savings it takes to cover the cost.

The five things you pay for

1. Subscriptions to AI tools

The simplest way in. You pay a monthly fee for each person who uses the tool. At the time of writing (November 2026):

• Microsoft 365 Copilot Business lists at £16.10 per user per month on an annual plan, excluding VAT, as an add-on to a Microsoft 365 business plan.
• ChatGPT Business is priced in US dollars, at $20 per user per month on an annual plan or $25 monthly, with a minimum of two users.

Prices change often, so check the vendor's own pricing page before you budget. The real question with subscriptions isn't the price per seat, it's how many seats actually get used. Paying for 20 licences that 5 people open is a common way to waste money.

Before rolling out Copilot in particular, check what it will be able to see. It reads everything a user has access to, including files that were over-shared years ago. Our Copilot readiness assessment covers what to fix first.

2. Usage-based AI costs

When AI runs inside an automation rather than a chat window, you usually pay the AI provider for what you use, measured in the amount of text processed. For most small business tasks, such as sorting emails, drafting replies or pulling details out of documents, this is cheaper than people expect. The AI triage agent we built costs about £30 a month to run.

Costs rise with volume, so ask for an estimate based on your real numbers, and set a spending limit on the provider's account.

3. Building or setting it up

A subscription gives you a tool. It doesn't connect that tool to your inbox, CRM or accounts software, or change how work flows through the business. That's where most of the time savings are, and it's usually a one-off project. The cost depends on how many systems are involved, how tidy your data is and how much checking the AI's work needs. We've broken those drivers down in how much an AI consultant costs.

4. Running and maintenance

Software you connect to changes, AI models get updated, and automations occasionally need fixing. Hosting and other software subscriptions are usually monthly. Find out before you start who looks after it and what that costs.

5. Your team's time

The cost most often left off the budget. Someone has to explain how the work is done today, test the new version and learn to trust it. Plan for a few hours a week from the people who know the process best while it's being built.

Free AI tools: what's the catch?

Free versions of AI tools are fine for trying things out. Be careful about what goes into them. On free and personal plans, your conversations may be used to train the provider's models, and you have little control over where data is stored or who can see it. Never put client records, personal data or anything confidential into a free AI tool. Business plans generally don't train on your data and give you admin controls, which is part of what you're paying for.

Does it pay for itself?

Use one sum:

Payback in months = one-off cost ÷ (monthly saving − monthly running cost)

For the monthly saving, take the hours a week the task takes now, multiply by the hourly cost of the person doing it, then multiply by about 4.3. Be honest about how much of the task AI will really take on. It's rarely all of it.

A real example: our AI triage agent took over work that had been a full-time role costing £37.5k a year, about £3,125 a month. It costs about £30 a month to run, so the business saves roughly £3,095 a month.

For subscriptions, the sum is simpler. If a £16 licence saves someone an hour a month, it has paid for itself. If nobody can say what it saves, it probably isn't saving anything.

How to keep AI costs down

• Start with one task. Pick the job that costs the most hours, fix that, measure it, then decide on the next one.
• Use what you already pay for. Many business tools now include AI features. Check before buying something new.
• Buy seats for people who'll use them. Start with a small group, then expand when you can see the benefit.
• Get readiness right first. Messy data and loose access controls make every AI project slower and riskier. Our free AI readiness scorecard shows where you stand in 4 minutes.

How Arx Certa helps

We're an AI consultancy for UK SMEs, based in Manchester. Our AI readiness assessment takes about 2 weeks and shows where AI would save the most time, with an estimate of the saving for each opportunity. If a £16 subscription will do the job, we'll tell you. If it needs a build, you get a fixed quote in writing before any work starts.

Frequently asked

What's the cheapest way for a small business to start using AI?

A business subscription to a general AI tool for one or two people, used on a specific task. That costs a few pounds a week and tells you quickly whether AI helps with your kind of work.

Is Microsoft Copilot worth it for a small business?

It can be, if your team works mostly in Outlook, Word, Excel and Teams, and your files are well organised. If permissions are messy, fix them first, because Copilot will surface anything a user can technically access.

Are AI running costs predictable?

Mostly. Subscriptions are fixed per user. Usage-based costs rise and fall with volume, so a busy month costs a little more. A spending limit on the provider's account stops surprises.

Can I claim AI costs against tax?

Software subscriptions and many project costs are usually allowable business expenses, and VAT-registered businesses can normally reclaim the VAT. Check with your accountant for your situation.

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