Forecast structure
For each month, record opening cash, receipts by expected date, essential bills, variable spending, one-time events, and closing cash.
Closing cashₘ = Opening cashₘ + Receiptsₘ − Paymentsₘ
One month's closing cash becomes the next month's opening cash. This sequence exposes a temporary shortfall that positive annual income can hide.
Six steps
- Start with the actual available balance.
- Enter income in the month it is likely to arrive.
- Add rent, debt, tax, and contractual dates.
- Estimate variable spending from several past months.
- Add insurance, travel, maintenance, and seasonal bills.
- Stress-test delayed income and higher essential costs.
Where Cash Years fits
The calculator provides a simplified 12-month trajectory using constant monthly net flow. Treat it as the baseline. Maintain a monthly calendar for timing detail and document why that calendar differs.
Signs of a weak forecast
- every month is identical despite seasonal work;
- an annual bill disappears because it is “not monthly”;
- one project repeats in every future month;
- closing cash goes negative with no action threshold;
- inputs change while assumptions remain undocumented.
The CFPB emergency-fund guide defines cash flow in terms of when money comes in and goes out, and suggests managing timing mismatches. Taxes and legal obligations remain jurisdiction-specific.