"现金收支折现法" can be translated into English as "Discounted Cash Flow (DCF) Method for Cash Receipts and Payments" or, more concisely, "Discounted Cash Flow Approach for Cash Flows".
In financial contexts, "折现法" (discounting method) is commonly referred to as the Discounted Cash Flow (DCF) Method. Since the original term refers to the discounting of both cash receipts (inflows) and payments (outflows), you could emphasize that aspect in the translation if needed for clarity in a specific context. However, the standard DCF terminology is widely understood in finance to encompass the discounting of all future cash flows, whether inflows or outflows.
Thus, in most cases, simply referring to it as the "Discounted Cash Flow (DCF) Method" would suffice, as it inherently includes the discounting of all relevant cash flows.