Will an AI tool pay for itself?
Work out whether automating a task pays, in your own numbers.
Five figures, two traps, one worked example.
Work it out in your own numbers before you buy.
Take the hours the task costs, the share a tool can do, minus the time spent checking its work.
Value that at what an hour costs you and subtract the tool.
If the setup takes more than eighteen months to recover, look for a smaller start.
The five numbers you need
- —Hours a week one person spends on the task.
- —How many people do it.
- —What an hour of their time costs the firm, including employer costs.
- —How much of the task a tool could do. Be modest.
Owners overestimate this more than any other number. - —The supplier’s quote: the monthly price and any setup cost.
Count your team’s time to learn it as part of the setup.
The two things estimates leave out
Checking time. An AI draft still needs reading before it goes to a client.
One owner put it well: AI removed the blank page and gave them a review pile instead.
The sum below gives 20% of the time saved back to checking.
Saved time is not saved money. Your costs only fall if paid hours fall.
Otherwise the return is whatever your team does with the freed time, such as more clients, faster replies or fewer late nights.
That is real, but say so honestly when you make the case.
A worked example
Two people spend eight hours a week each writing quotes.
An hour of their time costs the firm £30.
A supplier quotes £150 a month plus £1,000 to set up.
| If the tool does | Time freed each month | Net saving each month | Setup recovered in |
|---|---|---|---|
| A quarter of the task | 13.9 hours | £266 | 3.8 months |
| About half | 27.7 hours | £682 | 1.5 months |
| Most of it | 38.8 hours | £1,015 | 1 month |
The answer turns on the share a tool can do.
At a quarter it is a good case; at most of the task it is an easy one.
So test that number before you sign anything.
Getting honest numbers
- —Time the task for a week before deciding.
Guesses about admin time are wrong in both directions. - —Trial the tool on your own real examples, not the supplier’s demo, and time it including the checking.
- —Start with what you already pay for. A feature switched on in your existing software has no setup cost to recover.
If it does not pay
A task that does not pay is usually too small, not the wrong idea. Pick one more people do, or a bigger slice of the same work. Our guide to what to automate first shows how to find it with a one-week tally.
When several tasks compete and the sums are close, an AI audit runs this calculation across your firm and costs each option, including the ones that need no AI at all.
Frequently asked questions
How long should AI take to pay for itself?
Under six months is a strong case.
Under eighteen is worth doing for a stable task.
Beyond that, find a cheaper start.
Why count the time spent checking?
Every AI draft needs reading before it goes anywhere.
Leave that out and the saving looks far bigger than it is.
Does saved time mean lower costs?
Only if paid hours fall.
Otherwise the return is what your team does with the freed time.
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