Cash Burn Rate - Monthly Net Cash Outflow Tracking (Runway Calculation)
Tracking the company's monthly cash burn rate and calculating runway — the number of months of operating capital remaining — a critical metric for every startup's financial health.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Cash - Beginning of Month | Memo: $2,850,000 | - | - |
| Operating Cash Outflows (Payroll, Rent, Cloud, Software) | Memo: ($385,000) | 385,000.00 | - |
| Revenue Cash Inflows (MRR Collections) | Memo: $125,000 | - | 125,000.00 |
| Net Cash Burn This Month | Memo: ($260,000) | - | - |
| Runway: $2,850,000 / $260,000 = 10.96 months | Calculation Memo | - | - |
💡 Accountant's Note
Runway = Current Cash / Monthly Net Burn Rate. Net burn = Cash out − Cash in (operating only — exclude fundraising). Gross burn = Total operating cash out. Most investors focus on NET burn (acknowledging that revenue partially offsets costs). Runway is the most critical metric a startup tracks — it determines when the next fundraise must close. Rule of thumb: always maintain 12–18 months of runway; begin fundraising when at 6–9 months runway. Monthly tracking requires: (1) actual cash account balance (not accrual-basis cash from accounting), (2) trailing 3-month average burn (smoothed for one-time items), (3) forward projection of known changes (new hires, contract renewals, anticipated revenue growth).
Practitioner & Systems Framework
💻 ERP Architecture
Run a monthly cash flow analysis — this is SEPARATE from the accrual P&L. The cash basis statement of cash flows shows actual cash movements. Common errors: including equity financing cash as 'operational' (inflates runway calculation), using trailing 1-month burn (too noisy), or using accrual-basis expenses (which may differ from cash out due to prepayments, accruals, depreciation). Build a simple monthly cash tracker: opening cash + collections − payroll − vendors − rent − taxes = closing cash = next month's opening.
⚠️ Audit Flags
Going concern analysis (ASC 205-40) requires assessment of whether the company will be able to continue operations for 12 months from the financial statement issuance date. If runway is less than 12 months from issuance date, substantial doubt exists — triggering going concern disclosure and potentially a modified audit opinion. VC-backed startups frequently face this — the analysis requires considering management's plans (fundraising in progress, bridge financing, cost cuts).
📄 Required Documentation
Monthly cash flow statement (actual, not projected), trailing 3-month average net burn calculation, runway calculation, going concern analysis (ASC 205-40 if < 12 months runway), management's plans to address going concern (fundraising timeline, cost reduction plans).
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