1. The Management Dilemma of Excess Capacity
Fixed overhead costs (such as factory depreciation or facility maintenance) are incurred to provide a specific level of production capacity. To calculate accurate unit costs, management must decide which capacity baseline to use when spreading these fixed overheads across production.
2. The Four Tiers of Capacity Definition
Theoretical (Ideal) Capacity
The maximum possible output a factory can achieve if everything runs perfectly. It assumes machines operate 24/7 with zero downtime for maintenance, employee breaks, setup changes, or operational interruptions.
  • Utility: Unrealistic for budgeting, but serves as a useful benchmark for total efficiency goals.

Practical Capacity
The maximum output achievable after accounting for unavoidable, real-world operating interruptions.
  • Deductions: Reduces ideal capacity to account for statutory holidays, mandatory preventive maintenance, and standard shift changeovers.

Normal Capacity
The average production volume needed to meet customer demand over multiple years, accounting for standard seasonal highs and lows.
Budgeted (Actual) Capacity
The specific production volume expected during the upcoming short-term budget period (usually the next 12 months).
3. Strategic Cost Allocation and the Death Spiral
   THE FIXED OVERHEAD ACUMULATION spiral
=============================================================================
  Market Demand Drops ---> Production Volume Cuts ---> Denominator Base Shrinks
                                                               |
                                                               v
  Company Faces Business Liquidation <--- Price Competitiveness Fails <--- Unit Cost Spikes
=============================================================================

If a company allocates fixed overheads using Budgeted Capacity, a drop in market demand forces management to spread fixed costs across fewer units. This causes the calculated cost per unit to rise. If management raises prices to cover this artificial cost increase, demand drops further, creating a dangerous cycle known as the Fixed Overhead Death Spiral.
To prevent this, modern management accounting uses Practical Capacity to allocate fixed overheads, ensuring unit costs remain stable regardless of short-term demand shifts.
 
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