Knowing your total burn rate is not enough — understanding which departments are
consuming runway allows founders to make targeted cuts or investments.
Gross burn vs. net burn
Gross burn = total monthly cash out (all departments)
Net burn = gross burn − monthly revenue
Runway = cash balance / net burn
Typical department spend ratios (Series A–B SaaS)
Department
% of Total Headcount Cost
Engineering / Product
40–50%
Sales
20–30%
Marketing
10–20%
G&A (Finance, HR, Ops)
10–15%
Pre-product-market-fit companies are typically engineering-heavy (60%+).
Post-PMF, sales and marketing grow as a share.
Red flags in burn composition
G&A > 20%: overhead-heavy; trim ops costs before cutting product
Sales/Marketing > 60% combined: high CAC pressure; check payback period
Engineering < 25% post-PMF: underinvesting in product at the wrong time
How to Optimize Your Startup's Burn Rate by Department
A practical guide to analyzing and reducing startup burn rate — which departments to cut first, and how to extend runway without killing growth.
When runway shrinks, founders face the same question: where do we cut? Making random
cuts across all departments rarely works. A department-level analysis shows you where
cost reduction has the least growth impact.
Step 1: Map burn by department
Before cutting, understand your current burn composition. For most Series A–B SaaS:
- Engineering: 40–50% of headcount cost
- Sales: 20–30%
- Marketing: 10–20%
- G&A: 10–15%
Step 2: Apply the ROI filter
Not all departments have equal ROI. Ask for each: what revenue or product output does
this cost generate, and on what timeline?
Sales and marketing: high ROI if CAC payback < 18 months; cut demand gen before
account executives.
Engineering: rarely the right first cut unless you have product/market fit and
are in pure monetisation mode.
G&A: typically first to cut — contractors, software subscriptions, office costs.
Step 3: Cut to extend, not to survive
The goal of burn optimisation is to extend runway until your next value-creation
milestone (ARR target, product launch, breakeven). Define the milestone first.
Then cut to reach it with 3+ months buffer.
Benchmark: healthy burn multiples by stage
Stage
Target burn multiple
Pre-revenue
N/A
$0–1M ARR
2–4×
$1–5M ARR
1.5–2.5×
$5M+ ARR
<1.5×
Burn multiple = net burn / net new ARR added. <1× is world-class efficiency.
Startup Burn Rate: Formula, Types, and How to Track It
A complete guide to startup burn rate — gross vs net burn, how to calculate it, what investors expect, and how to track it monthly.
Burn rate is one of the most important metrics for pre-profitability startups.
Here is everything you need to know to calculate and track it correctly.
The two burn rate formulas
Gross burn rate = total monthly cash outflow
Sum of all salaries, rent, software, marketing, contractors, and other expenses.
Net burn rate = gross burn − monthly revenue
The actual amount of cash you consume each month after revenue offset.
Engineering vs Sales Burn Ratio: What's a Healthy Split?
How the ratio of engineering spend to sales & marketing spend shifts from pre-PMF through growth stage, and what an unbalanced ratio usually signals.
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.