I should be honest that I am a bootstrapped founder doing my own forecasting at EV Cable Hub, not a CFO with a finance team and a board to convince. But the call is the same one, just smaller, because my forecast drives how much stock and cash I commit, and getting it wrong ties up money I cannot spare.
The way I decide whether to reset or hold is by asking what is causing the gap. If actuals are off because of noise, a quiet fortnight, a delayed delivery, a one-off spike, I hold the target, because rewriting it every time the line wobbles trains everyone to stop trusting it. If the gap is structural, demand for a whole category shifting, a supplier price moving for good, then the old number is just wrong and clinging to it for the sake of focus is how you keep buying stock nobody wants. The test is whether the cause repeats.
The single practice that built my confidence in the forecast was separating a baseline I trust from the stretch I am aiming at, and only ever resetting the baseline. When I started forecasting demand off real sales data rather than hope, the share of my stock that earns its place climbed to about 90%, and the forecast stopped being a guess I quietly ignored. A number you have to defend with evidence is one you keep using.
What I would say to anyone, finance team or not, is reset for structural change and hold through noise, and be able to say out loud which one you think you are looking at.