Burn Rate: What is Burn Rate?

What is Burn Rate?

Burn rate, or cash consumption rate, measures the net amount a startup spends each month beyond its revenue. It is the most fundamental financial indicator for any growth-stage company that has not yet reached financial equilibrium. Burn rate directly determines the runway — the number of months the company can continue operating with its current reserves — and therefore conditions every strategic decision: hiring, investment, timing of the next fundraise.

Two types of burn rate are distinguished. Gross burn rate represents the total monthly company expenses, without considering revenue. Net burn rate is the difference between monthly expenses and monthly revenue. It is the net burn rate that truly determines the company's financial lifespan.

For Belgian startups, burn rate management is all the more critical given that the European venture capital ecosystem is generally more conservative than its American counterpart. Funding rounds are more modest and gaps between raises can be long. Rigorous burn rate management is therefore a competitive advantage in itself.

Why Burn Rate Matters

Burn rate is a startup's financial pulse. Its control determines the company's survival and success in the short and medium term:

• Runway calculation: runway = available cash / monthly net burn rate. If you have 600,000 euros in the bank and a net burn of 50,000 euros per month, your runway is 12 months. This indicator guides the timing of the next fundraise.
• Signal for investors: VCs analyse burn rate carefully. A high burn rate relative to revenue may signal poor management. A controlled burn rate with strong growth signals efficient execution.
• Strategic decision-making: every hiring, investment or marketing expenditure decision impacts burn rate. Understanding this impact enables prioritising investments that generate the best return.
• Company survival: the primary cause of startup failure is not product failure but cash exhaustion. Rigorous burn rate monitoring is the company's best life insurance.
• Valuation negotiation: a controlled burn rate with comfortable runway gives founders a strong negotiation position — they are not in an urgent situation and can afford to choose the right investor.

How It Works

Burn rate calculation is simple in theory but requires rigorous accounting discipline in practice. Gross burn rate is calculated by totalling all monthly expenses: salaries and social charges, rent, SaaS subscriptions, hosting costs, marketing, legal, accounting and other operational costs.

Net burn rate is calculated by subtracting monthly revenue from gross burn rate. If your monthly expenses are 80,000 euros and your revenue is 30,000 euros, your net burn is 50,000 euros. Your runway with 600,000 euros in the bank is therefore 12 months.

It is essential to distinguish recurring expenses (salaries, rent, subscriptions) from one-off expenses (equipment, fundraising legal fees) to calculate a representative burn rate. Investors focus on normalised burn rate, excluding exceptional expenses, to evaluate the company's financial trajectory.

Burn rate must be analysed in its evolution. A burn rate increasing faster than revenue is a warning signal. A stable burn rate with strongly growing revenue signals a path to profitability. The ultimate objective is reaching the break-even point, the moment when monthly revenue covers monthly expenses and net burn rate falls to zero.

Concrete Example

Consider a Belgian startup that developed a SaaS delivery management platform with Kern-IT and just raised 1.2 million euros in seed. Here is its monthly financial situation at the time of the raise:

Monthly expenses (gross burn): salaries and charges for 6 people (45,000 euros), cloud hosting (3,000 euros), SaaS tools (2,000 euros), digital marketing (5,000 euros), coworking office (1,500 euros), miscellaneous (3,500 euros). Total gross burn: 60,000 euros. Monthly revenue (MRR): 15,000 euros. Net burn rate: 45,000 euros per month. Runway: 1,200,000 / 45,000 = 26.7 months.

The founding team plans to hire 3 additional people within the next 6 months, raising gross burn to 85,000 euros. If revenue grows at 10% monthly (from 15,000 to approximately 26,500 euros after 6 months), net burn will be 58,500 euros. The revised runway with the remaining balance would be approximately 15 months. The founders therefore know they must begin preparing their Series A at month 12 to have time to close the round before reserves are exhausted.

Implementation

1. Establish monthly monitoring: calculate gross burn, net burn and runway every month without exception. Use an automated financial dashboard to track these metrics in real time.
2. Categorise expenses: distinguish fixed expenses (salaries, rent) from variable expenses (marketing, contractors) and exceptional expenses (legal, equipment) to identify optimisation levers.
3. Set alert thresholds: establish a minimum acceptable runway (typically 6 months) below which cost reduction measures are triggered automatically.
4. Model scenarios: build financial projections with different scenarios (optimistic, realistic, pessimistic) to anticipate funding needs and avoid surprises.
5. Optimise before raising: reduce burn rate by eliminating non-essential expenses before fundraising. A controlled burn rate improves negotiation position and investor perception.
6. Communicate with investors: include burn rate and runway in monthly investor reports. Transparency on these metrics reinforces trust and facilitates funding discussions.

Associated Technologies and Tools

• Accounting and reporting: Pennylane, Xero or Exact Online for rigorous accounting with automatic expense categorisation and financial report generation.
• Financial dashboard: Fathom, LivePlan or a customised Notion dashboard to visualise burn rate, runway and financial projections in real time.
• Modelling: Causal or advanced Google Sheets to build financial models integrating hiring, revenue and expense projections.
• Cash management: Agicap or Cashforce for cash flow forecasting and financial flow management with automatic alerts.
• Investor reporting: Visible.vc to automate sending monthly reports including key financial metrics to investors.

Conclusion

Burn rate is every startup's survival indicator. Its control is not an arid accounting exercise but a strategic tool conditioning every company decision — from hiring to fundraise timing to product investments. For Belgian startups, rigorous burn rate management is particularly important in an ecosystem where funding rounds are more modest than in the United States. At Kern-IT, we help our startup clients optimise their technical investments by building robust solutions with excellent value for money, directly contributing to controlling their burn rate and extending their runway.