Top-down is fast and keeps the budget tied to investor commitments, but targets set without operational input can be unrealistic and weaken ownership. Bottom-up produces numbers managers believe in, but it's slow, and padded estimates accumulate as each layer adds a buffer.
The hybrid approach is the norm in mid-market and enterprise finance. A typical cycle starts with a top-down revenue and margin target, departments respond with bottom-up plans, and finance runs two or three iterations to close the gap. The quality of the process depends on how quickly submissions consolidate, because slow consolidation eats the time available for real negotiation.
In software: budgeting platforms exist largely to run this loop. Vena and Prophix manage template distribution, submissions and approvals across departments. Anaplan supports target setting and bottom-up detail in one model, so the gap between the two views is visible at every iteration.
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