Cash runway estimates how long available cash can support expected net cash outflows. A simple first calculation divides usable cash by average net cash burn per month. For an operating business, subtract expected receipts from expected payments to calculate burn; do not divide cash by expenses while ignoring collections.
Use the result as an initial indicator. A dated cash forecast is more reliable where equipment payments, seasonal demand, loan commitments or customer collections vary materially. Also define whether runway ends at zero cash or at a chosen minimum operating reserve.
Define the cash available to spend
Consider an illustrative Kochi design studio holding ₹12,00,000 in operating cash. Management wants to maintain ₹3,00,000 as a minimum operating balance. The runway amount available above that floor is ₹9,00,000.
Exclude restricted balances and funds that cannot be used for ordinary operations. Keep undrawn credit or proposed owner investment separate until availability and conditions are understood. A possible funding conversation is not the same as money the studio can use today.
AS 3 distinguishes cash resources and noncash items and recognises that some balances may be unavailable for use. For a management runway calculation, the practical starting point is the amount genuinely accessible for the commitments being forecast.
Calculate net burn on a consistent basis
The studio expects monthly cash payments of ₹5,00,000 and customer receipts of ₹3,50,000. Net cash burn is ₹1,50,000 monthly. Dividing the ₹9,00,000 above the reserve by ₹1,50,000 gives six months before the reserve is reached, assuming constant flows.
Dividing total ₹12,00,000 cash by the same burn gives eight months to zero. Both calculations can be arithmetically correct, but they answer different questions. Label the endpoint so that the owner does not interpret the longer number as permission to consume funds intended for essential continuity.
| Illustrative assumption | Base case | Slower-collection case |
|---|---|---|
| Monthly payments | ₹5,00,000 | ₹5,00,000 |
| Monthly receipts | ₹3,50,000 | ₹2,50,000 |
| Net monthly burn | ₹1,50,000 | ₹2,50,000 |
| Cash above ₹3,00,000 floor | ₹9,00,000 | ₹9,00,000 |
| Simple runway to floor | 6 months | 3.6 months |
The downside figure does not mean a precise day can be inferred from monthly averages. It signals that the studio needs a more detailed schedule and earlier action if collections weaken.
Use payments rather than accounting expenses
Depreciation reduces accounting profit without being a current cash payment. Customer credit sales can increase revenue before receipts arrive. Supplier credit can delay payments after costs are incurred. Equipment purchases and loan repayments can consume cash outside ordinary operating expenses.
Start from the expected receipts and payments schedule or reconcile the profit forecast to cash movements. Avoid treating accounting loss as identical to net burn without checking these differences. ICAI's cash-management material includes both operating and other relevant cash commitments in cash planning.
Owner withdrawals also consume cash even where they are not operating expenses. Include the actual planned outflow under the correct entity-specific treatment rather than leaving it outside runway simply because it does not appear in the profit calculation.
Replace averages when large payments intervene
Suppose the studio plans a ₹2,00,000 equipment payment in month 2, in addition to the original ₹1,50,000 monthly net burn. Starting from ₹12,00,000, the projected closing balances become ₹10,50,000, ₹7,00,000, ₹5,50,000, ₹4,00,000 and ₹2,50,000 over months 1 to 5.
The ₹3,00,000 floor is first breached during month 5, earlier than the six-month average calculation without equipment. Schedule the actual date within that month before deciding when funding is needed.
Do not subtract the equipment payment from opening cash and also include it in month 2. Either treatment can be used in a clearly defined estimate, but applying both double counts the outflow.
Distinguish a temporary gap from continuing burn
A profitable business can show negative cash flow while building stock or waiting for a large customer settlement. A young business can also have a continuing operating deficit. The actions differ: collecting a specific receivable may resolve a timing gap, while persistent burn requires changing the underlying revenue or cost pattern.
Review the source of receipts. A one-off asset sale can extend runway but does not necessarily improve normal trading. New borrowing provides cash and creates future payment obligations. Show operating burn separately from financing and exceptional flows so the owner can see whether the business is becoming self-funding.
What if expected receipts exceed payments?
The simple negative-burn runway formula is no longer informative when the business expects sustained positive net cash. Continue forecasting the low points and stress cases instead. A positive monthly average can still conceal a large payment before the related collection arrives.
Set decisions before the cash floor arrives
Allow time for actions to take effect. Renegotiating a lease, finding new customers or arranging finance can take longer than one payroll cycle. Use forecast milestones linked to realistic response times rather than waiting until the reserve is nearly exhausted.
Track actual burn and the reasons it differs from plan. A recurring ₹50,000 collection shortfall deserves a revised assumption, while a one-off delayed invoice should have a named follow-up and expected resolution date.
Cash runway becomes useful when its endpoint, flow basis and major uncertainties are explicit. Begin with the simple calculation, stress receipts and spending, then use a dated forecast to identify the real action deadline. The objective is enough time to make a workable decision while choices remain available.