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Gross Burn vs Net Burn: The Difference and Why It Matters for Startup Investors
Lekha Editorial Team
CA-reviewed · Published
Gross burn and net burn are both real, both important, and both regularly confused — even by experienced founders. Knowing which number to report in which context prevents misunderstandings with investors and prevents bad decisions about how much runway you actually have.
The Numbers and What They Mean
Gross Burn Rate: the total cash a company spends in a month, regardless of revenue. If you spend ₹40 lakh on salaries, rent, marketing, and software in October, your gross burn is ₹40 lakh. Revenue doesn't factor in.
Net Burn Rate: gross burn minus revenue collected. If you spent ₹40 lakh and collected ₹15 lakh from customers in October, your net burn is ₹25 lakh.
Runway from gross burn: ₹1.2 crore cash / ₹40 lakh gross burn = 3 months. This is the worst-case scenario — how long you can survive if revenue completely stops.
Runway from net burn: ₹1.2 crore cash / ₹25 lakh net burn = 4.8 months. This is the expected scenario — how long you can operate at the current revenue and spend level.
Why both matter: the gap between gross and net runway (in this example, 1.8 months) represents how much runway your current revenue is buying you. If revenue is growing rapidly, net burn improves month over month and runway extends. If revenue is flat or declining, the gap narrows and net burn approaches gross burn.
When Investors Ask About Burn Rate
In an investor conversation, when someone asks 'what's your burn rate?', they almost always mean net burn — how much cash the company is actually consuming after revenue offsets operating expenses. This is the number that determines how long you have before you need more capital.
However, gross burn is what matters for hiring and cost structure decisions. If your gross burn is ₹40 lakh and you're planning to hire 3 senior engineers who will add ₹6 lakh/month to the burn, you need to know: (1) can your revenue growth absorb this additional gross burn? and (2) what does the new gross burn do to your net runway?
For board reporting: report both. 'Gross burn was ₹40 lakh. Collections from customers were ₹15 lakh, resulting in net burn of ₹25 lakh. At current net burn, runway is 4.8 months from current cash of ₹1.2 crore.'
For investor updates: lead with net burn and runway. Follow with gross burn and the composition of operating expenses if there's a material change from the previous month.
Collections vs Revenue: The Cash Accounting Distinction
Net burn uses cash collections, not accrued revenue. This is where most founders make errors.
Example: you invoice ₹15 lakh in October but your customer pays on net-45 terms, meaning the cash arrives in mid-December. In October: accrued revenue = ₹15 lakh, cash collected = ₹0.
October net burn (cash basis): ₹40 lakh gross burn - ₹0 collections = ₹40 lakh. October net burn (mistakenly using accrual): ₹40 lakh - ₹15 lakh = ₹25 lakh.
The cash-basis calculation is the correct one for burn rate. The accrual-basis 'net burn' looks better but overstates your actual cash position.
For the startup with net-45 customer terms: your effective burn is much closer to gross burn in any given month, because you're paying bills today that your customers won't pay for another 45 days. Working capital management — reducing payment terms, offering early payment discounts, requiring deposits — directly improves cash burn.
Key takeaway
Report gross burn for cost structure analysis; report net burn for investor communications and runway management. Update both monthly on a cash-collection basis, not an accrual basis. The discipline of knowing both numbers prevents the most common startup cash management error: being surprised by a cash shortage because accrual-basis numbers looked better than the actual bank balance.
Frequently asked questions
Should I include non-cash expenses in my burn rate calculation?
No. Burn rate is a cash metric. Non-cash expenses (depreciation, amortisation, ESOP expense accrual, certain provisions) are excluded from burn rate calculations even though they appear in the P&L. The question burn rate answers is: how fast is the bank balance declining? Cash expenses reduce the bank balance; non-cash expenses don't. Your EBITDA can be negative while your cash burn is lower than EBITDA suggests, if significant expenses are non-cash.
How does deferred revenue affect net burn calculation?
Deferred revenue (cash received from customers in advance, for services not yet delivered) is a cash inflow when received but is not revenue under accrual accounting. For burn rate purposes: include the cash collected in the month it's received, regardless of when the service is delivered. This makes sense — the cash is in your bank account. The deferred revenue liability on the balance sheet is an accounting adjustment; it doesn't affect your actual cash position.
What is 'cash EBITDA burn' and how does it differ from net burn?
Cash EBITDA burn adjusts EBITDA for the cash impact of working capital changes — increases in receivables (cash you haven't collected yet) increase EBITDA but don't represent cash received; increases in payables (bills you haven't paid yet) decrease EBITDA but don't represent cash paid. Cash EBITDA burn ≈ EBITDA ± changes in working capital. This is a more sophisticated burn analysis used at later stages when working capital movements are material.
If my net burn is negative (I'm cash flow positive), do I still need to track burn rate?
Once cash flow is positive, you no longer need to manage burn rate — instead you manage cash generation and deployment (should we accelerate hiring? make an acquisition? return capital?). However, cash flow positive companies can become cash flow negative quickly if they accelerate investment. Continue tracking gross burn as the cost base that would need to be covered if revenue declined, and model the cash impact of any significant new investment before committing.
How should a marketplace startup calculate its burn rate?
Marketplaces often have a complex cash picture: GMV flows through the platform, but only the take rate is the company's revenue. Burn rate = total company operating costs (salaries, tech, marketing) - take rate revenue collected. GMV passing through the platform is not company cash — it's held temporarily and passed to sellers. Ensure your burn rate calculation uses only the take rate (your revenue), not total payment flows through the platform, when calculating net burn.