A cash flow planning tool that provides a forecast of incoming cash from accounts receivable. It combines a standard invoice aging report with a projection model. Users input a list of outstanding invoices with due dates and amounts. The tool automatically categorizes these into aging buckets (e.g., 0-30 days, 31-60 days). Then, users can define collection probabilities for each bucket (e.g., 95% of current invoices collected, 80% of 31-60 day invoices). The calculator then projects the expected cash inflows for future periods, giving businesses a more realistic view of their short-term liquidity.