Net Present Value (NPV)

Discounts a cash flow series at a declared periodic rate. Accepts caller-supplied period offsets, or dated cash flows converted to years under a declared day-count convention (30/360, ACT/360, ACT/365, or a simplified ACT/ACT). Deterministic pow via Taylor-series exp/ln, no engine transcendentals. Foundation primitive for downstream valuation and lease/loan analytics.

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Mode

Discount rate (% per period)

Day-count convention (dates mode)

Valuation date (dates mode, YYYY-MM-DD)

Cash flows, one per line: amount,t (periods) or amount,YYYY-MM-DD (dates)

periods mode: amount,t · dates mode: amount,date

Result