A startup spending $100K per month isn't inherently good or bad. What matters is what that money buys. Here's how to tell the difference.

Good burn creates compounding value

Good burn goes toward things that build long-term advantage:

Engineering talent that ships product improvements
Sales that generate repeatable, growing revenue
Infrastructure that reduces future costs or increases capacity

The test: if you stopped spending this money tomorrow, would the value it created persist? Good burn builds assets. Bad burn buys time.

Bad burn fills gaps that shouldn't exist

Bad burn often looks like:

Expensive office space for a 5-person team
A marketing agency on retainer producing content nobody reads
Three project managers for a team of seven engineers
Enterprise sales team hired before product-market fit is confirmed

The pattern: spending on scale infrastructure before the fundamentals justify it.

The efficiency ratio

A useful metric: burn multiple = net burn divided by net new ARR.

Below 1x: Extremely efficient. Every dollar burned generates more than a dollar of ARR.
1-2x: Healthy. Reasonable spending for growth.
2-4x: Watch carefully. Acceptable in very early stages but should trend down.
Above 4x: Concerning. The startup is spending far more than it's generating.

Context matters

A pre-revenue startup building a deep-tech product will have a high burn multiple by definition - there's no revenue yet. That's expected. But a startup with 18 months of sales history and a burn multiple above 4x has a distribution problem, not a timing problem.

Questions to ask

"Walk me through your top 5 expense categories and what each produces."
"If you had to cut burn by 30% tomorrow, what would you cut first?"
"What's your path to break-even, and how many months away is it?"

The founder's answers reveal whether spending is deliberate or habitual. The best operators know exactly where every dollar goes and can justify it. The worst say "we need to spend money to make money" without specifics.

What this means for investors

High burn isn't automatically bad. Low burn isn't automatically good. What matters is whether the spending is producing measurable results and whether the founder has a clear framework for allocation decisions.

Before investing, understand the burn rate, what it buys, and how long the runway lasts. If the math doesn't work, no amount of market opportunity fixes it.