In capital budgeting, management accountants may have their own agendas when they are creating cash flow forecasts and recommending particular capital investments. What are the mechanisms management accountants can use to influence cash flow forecasts in capital budgeting? This field study investigates how management accountants prepared cash flow forecasts for product development investment decisions at a car company. We describe in detail two instances of the technical design of new cars, the preparation of cash flow forecasts, and decisions on capital investment projects. When management accountants monetarily quantify various kinds of inputs, they not only make pragmatic choices as part of their normal work of dealing with complexity and uncertainty, but they also purposefully intervene in various ways to make their cash flow forecast support a particular capital investment. These interventions can be differentiated in terms of their nature (qualitative or quantitative) and timing (initiating or counteracting). This field study contributes a conceptualization and empirical evidence on accounting tactics in the context of capital budgeting.