Burn rate is the speed at which a company uses up its cash, normally stated per month. Gross burn is the total cash that leaves the business in a month, before anything coming in is counted. Net burn is that same figure after cash received is subtracted, so it measures how far the bank balance actually fell. Gross burn describes the cost base, and net burn describes the loss.
The two numbers are usually different, sometimes by a wide margin, and the word "burn" on its own does not say which one is being quoted.
What is burn rate, and what do gross vs net actually measure?
Both are cash measures. Neither is a profit measure, and the difference between them is only what gets counted.
| Gross burn | Net burn | |
|---|---|---|
| What it counts | All cash out in the month | All cash out, minus all cash in |
| What it answers | What does it cost to run this business | How fast is the cash balance falling |
| Effect of revenue | None, revenue is ignored | Directly reduces the figure |
| Can it be zero or negative | No, unless nothing is spent | Yes, negative net burn means the balance grew |
| Best at showing | Cost structure and spending discipline | Survival math and the pace of decline |
A worked shape, with no real company's numbers attached: if a business pays out a certain amount in a month and collects roughly a third of that from customers, its gross burn is the full amount and its net burn is the remaining two thirds. Same month, same bank statement, two legitimate numbers.
Net burn is normally the figure used to calculate how many months of cash are left, because it reflects what actually happens to the balance. Gross burn is normally the figure used to sanity check the cost base, because it does not let good revenue hide expensive habits.
Which one should be quoted to an investor?
Both, with labels. A single unlabeled burn figure is the most common source of misunderstanding in an update, because the reader will assume whichever definition they use themselves.
Investors ask for burn because it sets the clock on everything else. In a priced round, the reporting obligation is usually written down rather than left to habit: the information rights in the National Venture Capital Association's free model legal documents (read 2026-09-08), particularly the Investors' Rights Agreement, are where periodic financial reporting to investors is defined in United States deals. Companies backed by venture capital typically report monthly against that kind of clause.
Reporting both numbers has a practical benefit for the company as well. Gross burn is the number that can be acted on directly, since it is made of contracts, payroll and subscriptions. Net burn moves for reasons partly outside the company's control, including one customer paying late.
Is burn rate the same as losing money?
No, and this is where the number quietly separates from the accounts.
Burn is cash movement. A profit and loss statement is built on accruals, which recognize revenue and costs when they are earned and incurred rather than when money moves. So a business can post a loss on the income statement while its cash balance holds steady, or post a profit while burning cash hard. A profitability ratio such as EBIT margin is answering a question about earnings, not about the bank account, and the two answers can point in opposite directions in the same month.
Non-cash charges are the clearest example. Depreciation reduces reported profit without any money leaving in that period, and a method such as accelerated depreciation concentrates more of that non-cash charge into the early years of an asset's life. The reported loss gets larger while the cash burn does not move at all.
The reverse trap is just as common. Buying equipment, paying a rent deposit, settling an annual insurance premium or paying down a loan all take cash out without appearing as costs of the month in the same way, so cash falls faster than the loss suggests.
What do both burn numbers leave out?
Neither gross nor net burn is defined by any accounting standard. There is no regulator, auditor or codification paragraph that fixes their meaning, which is why the same word covers several different calculations in practice. Five things are commonly left out.
- Capital spending. Some companies count equipment and capitalized costs in burn, some do not. It is a large line for anything with hardware.
- Financing flows. Money raised is cash in, but including it in net burn makes the figure meaningless, since a funding round would show the company generating cash. Financing is normally excluded.
- Timing distortions. A quarterly payroll tax, an annual software renewal or a single large collection makes one month unrepresentative. A one-month burn is a sample of one.
- Committed but unspent money. A signed lease, a hire with a start date and a contract already agreed are all future cash out that a historical burn figure has never seen.
- Non-cash compensation. Equity issued to people who work for the company is a real cost to owners and is invisible in a cash figure, because no cash leaves.
The honest reconciliation is to the statement of cash flows, the audited statement that separates operating, investing and financing movements. Any burn figure that cannot be traced back to it is a management estimate rather than a reported number, which is fine as long as everybody knows that is what it is.
When does burn become a formal problem?
At the point where it threatens the company's ability to meet obligations as they fall due. That is not a founder's judgment call, it is an accounting requirement, and it has a defined horizon.
Under the Financial Accounting Standards Board's going concern standard, ASC 205-40, issued as ASU 2014-15 (read 2026-09-08), management has to evaluate whether conditions raise substantial doubt about the entity's ability to continue as a going concern within one year after the financial statements are issued, and to disclose that doubt along with the plans intended to address it. Burn is one of the conditions that evaluation looks at.
This matters to a private company long before it has public reporting obligations, because the evaluation belongs to management and the disclosure sits in financial statements a lender, an acquirer or an investor will eventually read.
What actually reduces burn, and what only looks like it does?
Gross burn falls when contracted spending falls, which usually means people, premises, software and marketing commitments. Each has a term. Notice periods, statutory obligations, lease break clauses and minimum contract terms mean the reduction lands months after the decision, and often after a month of higher than normal cash out.
Net burn also falls when cash coming in rises, which is why collections work shows up faster than most cost cutting. Invoicing sooner, shortening payment terms and chasing overdue accounts change the cash line without changing anything about the business's cost structure.
Three moves reduce a reported number without reducing the underlying burn. Deferring supplier payments moves cash out to a later month and creates a bigger month later. Capitalizing costs that were previously expensed changes where they appear rather than whether the money left. Paying people in equity instead of cash removes a cash cost and creates an ownership cost that lands on existing shareholders instead. Each can be legitimate, and none of them is a reduction in what the company consumes.
The wider question of where replacement cash comes from is a separate one, covered across the types of startup funding available at each stage.
This page explains two measurements and is not financial, tax, legal or investment advice. It states no benchmark burn rate, because a defensible figure depends on a specific business, its stage and its obligations, and no general number would survive contact with any of them. Management accounts that a business will act on belong with a qualified accountant, and reporting obligations written into investment documents belong with a qualified attorney.
FAQ
How is burn rate calculated? Gross burn is total cash out over the period, usually a month. Net burn is total cash out minus total cash in over the same period, excluding money raised from financing. Both come from cash movements rather than from the profit and loss statement, and both should state which period and which exclusions were used.
Is a lower burn rate always better? Lower burn extends the time available, and that is all it does on its own. Burn is a rate of spending, not a measure of what the spending achieved, so two companies with the same figure can be in entirely different positions. Cutting spending that was producing revenue can shorten the life of a business rather than extend it. That trade-off is specific to one company and belongs in a conversation with its accountant.
Can net burn be negative? Yes. Negative net burn means more cash came in than went out over the period, so the balance grew. It is usually described as being cash generative or cash flow positive rather than as negative burn. A single month can be negative because of one large collection without the underlying position having changed.
Does burn rate include money raised in a funding round? Normally no. Financing inflows are excluded, because including them would show a company generating cash in the month it raised and burning heavily in every month after, which describes the fundraising calendar rather than the business.
Why do gross and net burn diverge so much for some companies? Because the gap between them is revenue. A pre-revenue company has no gap at all and the two figures are identical. A company with substantial revenue and heavy costs can have a very large gross burn and a modest net burn, which is why the gross figure is the one that shows what the business would cost to run if revenue stopped.