How busy a year is baked into your overhead rate?

Every standard cost carries a quiet assumption about how busy a normal year is, and right now that assumption is under pressure. The Federal Reserve put capacity utilization at 76.3 percent for July 2026, about three points below its long run average, with manufacturing lower still. Both IFRS and US GAAP say the same thing about that gap: fixed production overhead is allocated to units on the basis of normal capacity, the per unit charge is not raised because a plant ran quiet, and the overhead left unabsorbed is an expense of the period rather than a cost that rides into inventory. IAS 2 also asks that standard costs be reviewed regularly and revised in the light of current conditions. Read as a systems problem, the normal capacity figure buried in every overhead rate becomes a governed number worth owning: set on purpose, versioned, tied to the volume variance it produces, and checked at close so under absorbed fixed overhead reaches the income statement. Here is what the two standards require, why the single blended overhead rate most systems carry is the thing that quietly capitalizes a slow quarter, and the cost record worth building so the roll, the variance, and the close read from one normal capacity.