Monthly cash movement walkthrough
Burn Rate Example: Gross Burn, Net Burn, and Cash Change
An early-stage software company spends cash every month while subscriptions offset part of that outflow. This example uses three consecutive months to separate gross burn from net burn, average cash change, inflow coverage, and total net cash used.
Read outflows and inflows on separate lines
SignalDesk begins its planning review with actual cash movement for April, May, and June. Cash outflows were $78,000, $82,000, and $80,000. Customer collections and other operating inflows were $32,000, $38,000, and $35,000. These are consecutive months, not selected high and low points.
Gross burn describes outflows before inflows: $240,000 ÷ 3 = $80,000 per month. Net burn describes the amount by which outflows exceeded inflows: ($240,000 − $105,000) ÷ 3 = $45,000 per month. The two numbers answer different questions and should not share an unlabeled “burn” heading.
Average monthly cash change uses the opposite sign. A positive $45,000 net burn means cash changes by negative $45,000 per month. Showing both helps readers understand the operating direction without redefining the underlying calculation.
What we’re calculating
Gross burn = Total outflows ÷ months; Net burn = (Outflows − inflows) ÷ months; Coverage = Inflows ÷ outflows × 100
- Outflows
- $240,000 across three consecutive months.
- Inflows
- $105,000 across the same three months.
- Period
- 3 months.
- Cash change
- Inflows minus outflows, the inverse sign of net burn.
Total net burn remains $135,000 for the selected period; it is not another monthly figure.
Intermediate calculations, step by step
Total the outflows
$78,000 + $82,000 + $80,000 = $240,000.
Total the inflows
$32,000 + $38,000 + $35,000 = $105,000.
Calculate gross burn
$240,000 ÷ 3 = $80,000 average monthly outflow.
Calculate net burn and cash change
($240,000 − $105,000) ÷ 3 = $45,000 net burn; average cash change is −$45,000.
Measure coverage
$105,000 ÷ $240,000 = 43.75%; total net burn is $135,000.
Worked example
April through June cash movement
The company uses totals for the calculator and retains the monthly ledger to explain variation around the averages.
- April out / in
- $78,000 / $32,000
- May out / in
- $82,000 / $38,000
- June out / in
- $80,000 / $35,000
- Period
- 3 months
- Total outflows = $240,000; total inflows = $105,000.
- Gross burn = $240,000 ÷ 3 = $80,000 per month.
- Net burn = $135,000 ÷ 3 = $45,000 per month; average cash change = −$45,000.
- Inflow coverage = $105,000 ÷ $240,000 × 100 = 43.75%.
SignalDesk spends $80,000 in an average month, but customer and other inflows replenish $35,000. Cash therefore declines by $45,000 per month on average, for a $135,000 decrease across the selected quarter.
What the owner should notice month by month
April net cash use was $46,000, May was $44,000, and June was $45,000. The average of $45,000 is representative here because monthly changes are close, but the ledger still matters. A one-time annual payment or customer collection could make a short average misleading.
Coverage of 43.75% means inflows replaced 43.75 cents of each outflow dollar over the whole period. It does not mean expenses were 43.75% lower, and it does not identify which subscription or cost line changed.
Interpret gross burn and net burn separately
Gross burn helps evaluate the size of the operating cost base and cash required if inflows weaken. Net burn connects that base with current inflows and is the relevant input for a simple cash-runway calculation when it is positive.
Reducing gross burn by $5,000 and increasing inflows by $5,000 have the same immediate $10,000 combined effect on net burn, but very different operating implications. Keeping both components visible makes the chosen action and its durability easier to assess.
Alternative: inflows exceed outflows
In a second three-month scenario, outflows total $90,000 and inflows total $120,000. Gross burn is $30,000 per month, average inflow is $40,000, and net burn is −$10,000. Total net burn is −$30,000, while average monthly cash change is positive $10,000.
Negative net burn is not a calculation error. In ordinary language, the company is generating $10,000 of net cash per month during the selected period. It still has $30,000 of gross monthly outflows, so management should retain both facts rather than replacing every result with a single positive label.
- Gross burn: $30,000 monthly.
- Net burn: −$10,000 monthly.
- Plain-language state: net cash generation of $10,000 monthly.
Move from historical average to a deliberate forecast
The three-month calculation describes what happened. For planning, SignalDesk should replace known one-time movement and add approved changes such as hires, contract renewals, annual software bills, or customer payment schedules. The historical average is a starting point for those assumptions, not a reason to assume every future month will equal $45,000 of net burn.
Management should preserve a bridge from actual history to adjusted forecast. If planned net burn is lower, the bridge should identify whether the change comes from lower gross outflow or stronger inflow and when it begins. This prevents a target from being mistaken for current performance.
Outflow and inflow levers
Reduces positive net burn
- Durable subscription collections increase.
- A recurring cost is removed without damaging delivery.
- Annual or one-time cash movement is normalized for planning.
- The review window is long enough to represent operations.
Can distort or increase burn
- One large collection makes recurring inflow look stronger.
- Capital purchases are silently removed from actual cash history.
- Gross and net burn are reported under the same label.
- Totals cover different dates or period length is entered incorrectly.
Common mistakes
Where the calculation goes wrong
Calling outflow net burn
Outflows divided by months are gross burn. Net burn subtracts inflows first.
Changing signs inconsistently
Positive net burn corresponds to negative cash change; preserve that relationship.
Treating negative burn as invalid
When inflows exceed outflows, report net cash generation in plain language.
Hiding monthly variation
An average should be accompanied by the underlying sequence when timing is material.
Action checklist
Before you use the result
- Choose consecutive months.
- Reconcile total cash outflows and inflows to the same period.
- Calculate gross and net burn separately.
- Verify cash change uses the opposite sign.
- Inspect each month for one-time movement.
- Describe negative net burn as net cash generation.
FAQ
Questions beyond the basic calculation
Should equipment purchases be included in burn?
Include actual cash outflows for a historical cash-movement view, then identify unusual capital spending when building a recurring forecast. Do not silently remove it from the reconciled period.
Can gross burn fall while net burn rises?
Yes. If inflows fall by more than outflows decline, net cash use increases despite a smaller cost base. Review both sides.
What does unavailable inflow coverage mean?
If outflows are zero, coverage would divide by zero. State that there were no outflows to cover rather than displaying Infinity or forcing the percentage to zero.
Should the company use one month or several?
Use a period representative of the decision. Several consecutive months can reduce noise, while a current month may be useful after a structural change. Keep the period explicit.
Note: This cash example is illustrative and not a software-company benchmark or forecast. Classification and planning adjustments should reflect the company’s actual records.