The Timing Principle: Cash flow is recorded when the money actually changes hands, not when a transaction is invoiced. This is the fundamental difference between cash-based and accrual-based accounting.
Prudence Concept: Forecasts should be conservative, often underestimating potential inflows and slightly overestimating potential outflows to ensure a safety margin.
Net Cash Flow Calculation: The core mathematical logic follows the identity: .
Closing Balance Identity: The ending position for one period is the starting position for the next: .
| Feature | Cash Flow Forecast | Income Statement (Profit) |
|---|---|---|
| Basis | Cash Basis (Actual movement) | Accrual Basis (Earned/Incurred) |
| Non-cash items | Excluded (e.g., Depreciation) | Included |
| Capital Items | Included (e.g., Asset purchase) | Excluded (only depreciation shown) |
| Purpose | Liquidity & Solvency | Performance & Profitability |
Check the Timing: Always look for 'credit terms' in a problem. If a business offers 60-day credit, ensure the cash inflow is placed two months after the sale month.
Exclude Non-Cash Items: In exams, examiners often include 'Depreciation' or 'Bad Debt Provisions' to trick students. These must be ignored in a cash flow forecast.
Opening/Closing Link: Ensure the closing balance of Month 1 is exactly the same as the opening balance of Month 2. A common error is recalculating the opening balance incorrectly.
VAT/Sales Tax: Remember that cash flows usually include VAT/Sales Tax because the business actually receives/pays the full amount, even if they later remit it to the government.
Sanity Check: If the net cash flow is negative but the bank balance is positive, the business is 'burning' cash but is not yet insolvent. If both are negative, immediate financing is required.
Confusing Profit with Cash: A business can be highly profitable but go bankrupt because its cash is tied up in unpaid invoices (receivables) or unsold stock (inventory).
Ignoring Lead Times: Failing to account for the delay between ordering materials and paying for them can lead to a 'cash crunch' during periods of rapid growth.
Over-optimism: Assuming 100% of customers will pay on time. A realistic forecast should account for potential delays or defaults.
Forgetting One-Off Payments: Annual insurance premiums, quarterly tax payments, or semi-annual interest can cause sudden, large outflows that are easily missed in a monthly average.