The ratio between engineering spend and sales & marketing spend is one of the clearest signals of what stage a company is actually in — regardless of what stage it claims to be.
Typical ratios by stage
| Stage | Engineering / Product | Sales & Marketing | Signal |
|---|---|---|---|
| Pre-PMF | 55–70% of headcount cost | 10–20% | Still building the right product |
| Early PMF | 40–50% | 20–30% | Beginning to scale distribution |
| Growth | 30–40% | 35–45% | Distribution is now the primary lever |
| Scale | 25–35% | 40–50% | Efficient go-to-market motion in place |
What an unbalanced ratio signals
Engineering-heavy past growth stage (60%+ of spend on product while growth is healthy) often means go-to-market is under-resourced relative to product readiness — the company can build faster than it can sell.
Sales-heavy before PMF (large sales & marketing spend while engineering is thin) is a red flag: it usually means the company is trying to force growth on a product that isn't ready, which shows up later as high churn from customers who were sold on promises the product doesn't yet deliver.
Why this matters more than total burn alone
Two companies can have identical total burn and wildly different outcomes depending on allocation. A company burning $200k/month mostly on engineering pre-PMF is investing in the right thing; the same $200k/month split evenly with sales before the product is ready is often burning cash on customers who won't stick.
How to use this in a board conversation
Present department burn as a percentage of total, not just dollars, and track the trend quarter over quarter. A shifting ratio — engineering share declining as sales share rises — is the expected and healthy pattern as a company moves from building to scaling.
Frequently asked questions
Where does customer success/support spend fit? Usually tracked separately once it's material, since it scales with the existing customer base rather than acquisition — lump it with G&A or break it out as its own department once it exceeds roughly 10% of total burn.
Should this ratio include founder time, not just cash spend? For internal planning, yes — founder and early-employee time is real cost even if not cash burn. For investor-facing burn multiples, cash spend is the standard basis.
Use the Cash Burn by Department Calculator to see your own department split and compare it against the stage benchmarks above.