A mass balance check compares the quantity of certified raw material an operator bought over a period with the quantity of certified product it sold, allowing for yield, waste and stock movement. If more certified product left than certified material could possibly have produced, the surplus was not organic. It is the most effective fraud test an organic auditor has.
How the arithmetic works
The auditor takes opening stock, adds documented certified purchases, subtracts documented certified sales and closing stock, and applies a realistic processing yield for the product. Frozen fruit has a predictable yield range from intake to finished IQF goods, so a claimed yield outside that range is itself a finding.
Where operators fail it
- Parallel production of organic and conventional lines without proper batch separation records.
- Yields recorded as an assumption rather than measured per batch.
- Rework and downgrades that are never subtracted from the organic pool.
- Storage at a third-party cold store whose records the operator cannot produce.
Why it matters to a buyer
Ask whether the last audit included a mass balance exercise and whether any deviation was raised. It is a fast, high-signal question, and a supplier with clean traceability answers it without hesitation.
Related reading: building the supplier approval pack.