Monthly minimum
The floor a provider charges regardless of headcount, because per-seat tooling costs money before anyone answers a ticket.
Almost every provider has one and most do not publish it. It exists because the software behind managed IT is licensed per seat: remote monitoring, endpoint protection and identity tooling together run roughly $10 to $20 per user per month before a human is involved.
Per-seat tooling costs a provider $10 to $20 per user before a human touches a ticket, and the fixed cost of simply having an account on the books does not shrink with headcount. That is why the smallest accounts either get a floor or get quietly deprioritised.
A published floor is better for the buyer than a hidden one. It means the quote you see at four people is the quote you pay, rather than a number that grows during the call.
What it costs
We set ours at the equivalent of three people. Below that headcount the minimum is what you pay, and it is on the rate card rather than saved for the call.
Related questions
Why is there a minimum at all?
Per-seat tooling costs $10 to $20 per user before anyone does any work. Below about five seats the licensing alone exceeds what a cheap per-seat plan bills.
We are four people. What do we pay?
The minimum, so the same as six people would. Plenty of companies start there and grow into it.