Win rate is the share of sales opportunities that end in a win. The arithmetic depends entirely on the denominator: all opportunities created, everything that reached a close, or only the deals that were won or lost with no-decision outcomes excluded. The same quarter produces three different percentages.
Three sales leaders report their win rate on the same quarter of data. One says 30%, one says 43%, one says 55%. All three have done the arithmetic correctly, and each has divided by something different: every opportunity created, everything that reached a conclusion, or only the deals that were actively won or lost. Nobody is lying and the three numbers support three different decisions, so the useful habit is to state the denominator every time the figure is quoted rather than to settle on one definition and assume everyone else uses it.
Which one to use depends on what the number is for. Pipeline coverage and capacity planning need the widest denominator, because the question is how many opportunities have to be created to produce a given number of wins, and opportunities that went nowhere consumed real selling time. Competitive positioning needs the narrowest, because losing to a competitor and a buyer deciding to do nothing are different failures with different fixes. The middle version, everything closed, is the one that tends to end up on a dashboard, mostly because it is what a CRM reports by default. Two further cautions. Counting by deal count and counting by value give different answers whenever big deals are harder to win than small ones, which is usually. And a win rate measured on opportunities created in the same quarter is distorted by the ones still open, which is why longer sales cycles need the measure taken on a cohort of opportunities followed to their conclusion rather than on a calendar window.
A team created 200 opportunities during the quarter. By the end of it, 60 were won, 50 were lost to a competitor or on price, 30 closed with the buyer deciding to do nothing, and 60 were still open.
The 54.5% goes in the board deck. The 30.0% is the one a capacity model needs, because pipeline is built from opportunities created. A team comparing its win rate to a competitor's published figure is almost certainly comparing two different denominators.
Tighten qualification and the win rate rises immediately, because the marginal opportunities that would have been lost were never created. That can be a genuine improvement in focus or a team quietly declining to compete, and the win rate alone cannot tell the two apart. Read it next to the count of opportunities created and the total value won. A win rate climbing from 30% to 45% while opportunities created fall by half is a smaller business with a better-looking metric.
Commish pays win rate the way your plan describes it, shows the arithmetic on every line, and traces each payment back to the deal that earned it.