$18,000 a year at the annual Teams rate, because 100 users is the last headcount Dash for Teams covers. At 101 users the same deployment is priced on Dash for Business at $35 per user per month, which is $42,420 a year. The single additional person therefore adds $24,420 to the annual bill.
This is the number to model before you buy, and it is arithmetic rather than an accusation. Dropbox publishes both rates openly. But it means the cost curve for Dash is not a curve at all, it is a staircase with one very tall step, and the step is positioned exactly where a successful internal rollout lands. Here is what the whole range looks like at list price, before any Dropbox customer discount.
| Seats | Dash plan | Rate per user per month | Dash cost per year | Effective cost per seat per year |
|---|
| 10 | Teams | $15 | $1,800 | $180 |
| 25 | Teams | $15 | $4,500 | $180 |
| 50 | Teams | $15 | $9,000 | $180 |
| 100 | Teams, the last seat it covers | $15 | $18,000 | $180 |
| 101 | Business, the first seat over the line | $35 | $42,420 | $420 |
| 150 | Business | $35 | $63,000 | $420 |
| 250 | Business | $35 | $105,000 | $420 |
Notice the effective cost per seat in the last column. It holds flat at $180 a year all the way to one hundred people, then jumps to $420 and holds flat again. If your headcount plan for next year has you somewhere between 85 and 115 people, you are buying on the edge of a cliff and should price both sides of it now.
There is a tactical answer if you land just over the line, and it is worth naming because your Dropbox rep will not volunteer it. Ninety-five seats on Teams costs $17,100 a year. If five of the people you were about to license are occasional users rather than daily ones, leaving them off the license keeps you on the cheaper tier and saves $25,320. That is a real decision with a real trade-off, not a loophole, and it is the kind of thing worth deciding deliberately instead of discovering at renewal.