How expensive is each new dollar of revenue from product?
№ 188 · Engineering cost per net new revenue dollar
Definition
MetricR&D and engineering cost per dollar of net new ARR
UnitUSD of R&D spend per $1 of net new ARR
Bar or line of fully-loaded engineering cost divided by net new revenue per quarter. An efficiency metric. Below 2 means efficient; above 5 means bloated team or weak monetization. Build from eng comp plus ARR data. Example: $1.4M eng cost / $700K new ARR = 2.0.
- ARR
- Annual recurring revenue. MRR at period end multiplied by 12, or the annualised value of active contracts.
Benchmarks
| Bottom 30% | Median | Top 30% |
|---|---|---|
| $2.00 or more. R&D held near or above the median share of ARR while growth falls into the low teens produces this, and it is the most common failure shape in 2024 and 2025 data. | $0.85 to $0.95. Derived from a median R&D line of 22% of ARR against median private B2B SaaS growth of 25%. | $0.45 or less of R&D spend per $1 of net new ARR. This is what a company running R&D at roughly 20% of ARR while growing at the top-quartile rate of about 50% produces. |
Private B2B SaaS, roughly $1M to $100M ARR, fiscal 2024 and 2025. R&D is the full engineering and product cost line including salaries, tooling and infrastructure, as surveyed by SaaS Capital and Benchmarkit. Net new ARR is ending ARR minus beginning ARR, inclusive of expansion and net of churn. · No publisher reports this ratio directly. The figures above are derived by dividing published R&D as a percent of ARR by published growth rates drawn from the same surveys, and should be read as an order of magnitude rather than a precise percentile. Definitions diverge sharply: SaaS Capital puts the private median at 22% of ARR, Benchmarkit at roughly 31% of revenue on a broader cost definition, and Meritech puts public software companies near 17% of revenue. SaaS Capital's R&D line jumped from 18% to 22% of ARR in one year on AI-related spend, so any comparison against a 2022 or 2023 baseline understates today's cost per dollar.
| Category | Bottom 30% | Median | Top 30% |
|---|---|---|---|
| Private B2B SaaS, all sizes, R&D as % of ARR | 35% or above without a matching growth rate | 22% of ARR per SaaS Capital, roughly 31% of revenue per Benchmarkit on a broader definition | 15% or below |
| Private B2B SaaS under $5M ARR, R&D as % of ARR | Above 50% with growth under 30% | Above the all-size median, though Benchmarkit reports this band fell in the latest cycle. Drivetrain notes early-stage companies often exceed 50% | Not separately published |
| Public software companies, R&D as % of revenue | Not separately published | Roughly 17% per Meritech | Not separately published |
| Equity-backed vs bootstrapped private B2B SaaS | Equity-backed companies growing below their cohort median | Equity-backed companies spend 56% more on R&D than bootstrapped peers, with total spend at 101% of ARR against 96% | Bootstrapped companies run the leaner R&D line |
When it looks bad
The cost-per-dollar line steps up quarter after quarter while engineering head count keeps rising, so each release buys less revenue than the one before and the trend does not reverse on its own.
R&D held flat at 24% of ARR while growth fell from 34% to 12%, taking cost per net new ARR dollar from $0.71 to $2.00 across five quarters with no change in ship rate.
What to do about it
- Cap keep-the-lights-on work and report the split every sprint. ICONIQ's rule of thumb is to hold KTLO at 10% to 15% of total engineering time and spend the rest on elective investment, which is the single cheapest way to move this ratio without touching head count.
- Point a defined share of the engineering budget at expansion rather than new logo capability. Benchmarkit puts the expansion CAC ratio at $1.00 of spend per $1 of ARR against $2.00 for new customer ARR, and High Alpha finds companies above $50M ARR already take roughly 60% of new ARR from existing customers.
- Require a revenue hypothesis and a measurement plan before a build enters the sprint, with a named plan boundary, usage meter or price change attached. Without one the numerator is real and the denominator is unattributable, which is how the median company ends up unable to compute this chart at all.
- Track R&D spend per engineer against the $200,000 to $250,000 ICONIQ band and infrastructure against the 7% to 15% of revenue band. A ratio that looks bad because of infrastructure cost needs a different fix from one that looks bad because of head count.
Sources
- SaaS Capital Total median spend across all departments is 96% of ARR for bootstrapped companies and 101% for equity-backed. Higher-growth bootstrapped companies spend more on R&D and less on G&A than slower-growing bootstrapped peers. saas-capital.com ↗
- SaaS Capital Median growth rate of 25% for 2024, down from 30% in 2023. Bootstrapped median 23%, equity-backed median 25%. This is the denominator used to derive the cost-per-dollar ratio. saas-capital.com ↗
- Benchmarkit R&D investment has increased at each stage of growth over prior years, while the share allocated to R&D at companies under $5M ARR fell, which the authors tentatively attribute to AI-assisted development tooling. benchmarkit.ai ↗
- ICONIQ Growth Median R&D spend per employee stabilises in the $200,000 to $250,000 range. Infrastructure costs typically run 7% to 15% of total revenue. Recommends capping keep-the-lights-on work at 10% to 15% of total engineering time. cdn.prod.website-files.com ↗
- ICONIQ Growth R&D spending forecast to grow at a median of 19% year over year, with AI-driven companies forecasting higher R&D as a percentage of revenue than traditional SaaS peers. iconiq.com ↗
- Meritech Capital Tracks operating metrics and net new implied ARR by ARR bucket across the public software index, and reports most public software companies struggling to grow revenue more than 15% in a year. meritech.substack.com ↗
- Drivetrain Private SaaS median R&D spend runs 22% to 31% of revenue depending on survey, against roughly 17% for publicly traded companies per Meritech. Early-stage companies often run above 50%. drivetrain.ai ↗
- High Alpha Companies above $50M ARR now generate roughly 60% of new ARR from existing customers, which changes what engineering spend should be pointed at. highalpha.com ↗
- Lighter Capital Median annual revenue growth of 28% in 2025 against 47% in 2024, upper quartile 65% against 88%. Confirms the denominator compression that pushes cost per new dollar up. lightercapital.com ↗
- SaaS Mag The median SaaS company now spends about $2.00 on sales and marketing to generate $1 of new ARR, up 14% since 2023. Useful as the comparator when deciding between building and selling. saasmag.com ↗
- SaaStr Engineering and G&A come down as a share of revenue after $20M ARR while sales and marketing do not, so the engineering cost per new dollar should improve with scale if growth holds. saastr.com ↗