These are NOT the same thing. Easy to confuse.
| Term | What It Measures | Formula |
|---|---|---|
| Total Manufacturing Costs | Everything spent on production this period | Direct Manufacturing + Direct Labour + MOH = Manufacturing Overhead |
| Cost of Goods Manufactured | Cost attached to units that finished this period | Beginning WIP Goods + Total Manufacturing Costs − Ending WIP Goods |
The Difference
Total Manufacturing Costs captures spending on ALL units worked on—including units still in progress.
COGM captures only what’s attached to units that crossed the finish line.
Example
You start 100 units, finish 80, leave 20 on the assembly line.
| Measure | Captures |
|---|---|
| Total Manufacturing Costs | Spending on all 100 units |
| COGM | Cost attached to the 80 completed units |
Why COGM Exists
Matching principle. Costs should follow the product until sale.
- COGM = product costs ready to move to Finished Goods
- Those costs sit on balance sheet until product sells
- Then they become COGS (expense) matched to revenue
The Adjustment
COGM adjusts Total Manufacturing Costs for partially completed goods:
- Add Beginning WIP: includes costs from last period now finishing
- Subtract Ending WIP: excludes costs for units not yet complete
North: Where this comes from
- Matching Principle (expense when revenue recognized, not when spent)
- Universal Inventory Formula (same Out = Beg + In − End structure)
East: What opposes this?
- Cash Basis Accounting (expense when spent, no matching)
- Total Manufacturing Costs (the thing being adjusted)
South: Where this leads
- Finished Goods Inventory (COGM flows in)
- Cost of Goods Sold (COGM eventually becomes COGS)
- Schedule of Cost of Goods Manufactured (formal report showing this calculation)
West: What’s similar?
- Accrual Adjustments (timing differences between spending and recognition)
- Revenue Recognition (same matching logic for the income side)