The sales efficiency denominator is the go-to-market cost base you divide net new ARR by. Two RevOps teams looking at the same company can produce materially different efficiency ratios, purely from what each one counted. Fixing the definition matters more than debating the result.
Costs that always belong
Everything spent to win revenue in the period sits in the denominator. That means fully loaded seller compensation, including base, commissions actually paid, benefits, and payroll tax. It means sales management, sales engineering, and sales development. It means marketing program spend, marketing headcount, agency fees, and the tooling both functions run on.
Allocated overhead is where teams get sloppy. If a RevOps analyst spends most of their time supporting the selling motion, that cost belongs in the denominator. If they support finance reporting, it does not. Write the allocation down once and apply it consistently, because the ratio's value comes from comparability across quarters.
Costs that do not belong
Delivery costs sit above the gross margin line and stay out. Hosting, production support, and professional services delivery are cost of goods sold, not cost of sales. Moving them into the denominator understates efficiency and corrupts gross margin at the same time.
Research and development stays out. General and administrative stays out. One-time restructuring charges stay out, though they should be footnoted rather than silently removed, or the trend line will show an efficiency gain that never happened.
Match the denominator to the numerator
This is the rule that catches most errors. If renewal ARR is in the numerator, the cost of the team that defends renewals must be in the denominator. If the numerator is new and expansion ARR only, then the renewal function's cost belongs to a separate calculation measured against net revenue retention.
The same symmetry applies to segments. Running an efficiency ratio for enterprise using company-wide marketing spend credits enterprise with demand generation that fed SMB. Allocate spend to the segment that consumed it, or report only the company-wide figure.
Write it down before the number gets used
The denominator definition should live in one document, name the general ledger accounts it draws from, and state the allocation percentages. Efficiency ratios end up in board decks and budget decisions, and an undocumented denominator turns every one of those conversations into an argument about arithmetic instead of about the business. The same discipline is what separates a repeatable forecast from a monthly guess, and it is covered further in sales forecasting best practices.
Frequently Asked Questions
Does customer success belong in the denominator?
Only if the revenue that team produces sits in the numerator. If customer success owns renewals and expansion and those bookings are counted as new ARR, the team's cost belongs below the line. If the numerator counts new logo ARR only, leave customer success out and measure it separately against retention.
Should sales commissions be included?
Yes, at actual paid amounts rather than plan. Commissions are a real cost of producing the booking. Excluding them understates go-to-market spend by a meaningful share and makes an overpaying comp plan invisible in the efficiency ratio.
What about marketing spend that produces pipeline for future quarters?
Include it in the period it was spent, then decide separately whether to lag the whole denominator by a quarter to match your sales cycle. Splitting individual campaigns across periods introduces judgment calls that nobody can audit later.
Do product-led signups change what belongs in the denominator?
They change the mix, not the principle. Any cost incurred to acquire or convert a customer belongs in the denominator, including growth engineering headcount dedicated to conversion surfaces. The test is whether the cost exists to win revenue, not which department it reports to.
Put these metrics to work
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