Contract Manufacturing TP: Cost Base, Mark-Up and Capacity Issues

The contract manufacturer is the textbook tested party: it performs a defined manufacturing function on inputs and to specifications provided by the commissioning party, it owns no (or no valuable) intangibles in the product, and its return is a routine mark-up on its costs. The method is usually cost plus — or TNMM on OP/OC where the pool is the discipline — and the entire study lives or dies on the cost base and the capacity question.

Toll vs contract manufacturing

	Toll manufacturing	Contract manufacturing
Inputs	The commissioning party supplies the raw materials	The manufacturer procures inputs, or a mix
IP / formulation	The commissioning party’s, used under license	The commissioning party’s, or shared
Inventory risk	Minimal — the manufacturer holds the commissioning party’s inputs	Higher — the manufacturer may hold its own inventory and stock
TP treatment	The cleanest cost-plus fact pattern: the service is the conversion, priced on the conversion cost	Cost plus on a wider cost base (materials pass-through handled separately) or TNMM

The distinction matters because it fixes what the cost base is: for toll manufacturing, the base is the conversion cost — labour, overheads, the manufacturing expense — with the materials (the commissioning party’s) passing through at cost, not inside the mark-up base. For contract manufacturing where the manufacturer buys inputs, the treatment of the materials in the base (in or out, at cost or at purchase price) is a stated decision that follows the pricing structure of the contract.

The cost base, line by line

The cost base is the most examined number in the file. The discipline:

Line	Treatment	The examination question
Direct labour (incl. statutory benefits)	In	The definition of “direct” — which teams count as manufacturing
Direct materials	Per the contract structure (pass-through or in base at cost)	Whether the mark-up applies to materials it should not
Power, consumables, spares	In	Capitalized vs expensed items
Depreciation on manufacturing assets	In (on the manufacturing asset base, stated)	Whether non-manufacturing assets’ depreciation leaked in
Allocated overheads	In, on a stated basis (machine hours, floor space, headcount)	The basis — and whether “allocated” means “allocated generously”
R&D / engineering	Out (the manufacturer performs no R&D — the formulation is the commissioning party’s)	Any “product improvement” cost that is really the commissioning party’s function
Intercompany charges (management fees, shared services)	Out of the mark-up base unless the charge itself is arm’s length and stated	The base padded with intra-group charges
Financing cost	Out of the operating cost base (the return is the operating mark-up; financing is the entity’s own cost)	Interest inside the base, or the mark-up implicitly financing the group

The base is presented line by line in the file, with the definition of each line, and it is the same base in every year and every document — the Local File, the benchmark working, the return. A base that differs between the benchmark working and the accounts is the finding that ends the discussion.

The mark-up, and where it comes from

• Cost plus (declared method): the mark-up is benchmarked against comparable contract/toll manufacturers — the pool of independent manufacturers performing comparable conversions, on the same cost definition, with the IQR of their mark-ups (or OP/OC) as the range. The tested party’s mark-up inside the range: done.
• TNMM on OP/OC: the same economics expressed as a net indicator — the tested party’s OP/OC against the pool’s IQR. See cost plus vs TNMM for why the two must be run on one cost definition.

The mark-up range is sensitive to the pool’s composition: manufacturers with different capacity utilization, different asset intensity and different contract risk earn different mark-ups, and the screen must keep the pool comparable on those dimensions (the size screen, the capacity discussion, the contract-risk review).

Capacity utilization: the issue the base hides

A manufacturer’s mark-up is earned on the capacity it uses. The capacity question enters in two directions:

1. Low utilization at the tested party. Where the manufacturer runs far below its designed capacity, its per-unit fixed costs are high and its realized mark-up is depressed. The defensible position is that the commissioning party pays for the function as performed — the file does not “top up” the mark-up to the full-capacity level absent a capacity commitment in the contract (a take-or-pay or capacity-fee clause changes the economics and is priced as such).
2. The comparable’s utilization differs. A comparable running at full capacity earns a better mark-up than the tested party’s operating position; the file addresses the difference (an adjustment for the utilization gap, or a pool restricted to comparable utilization, stated).

The OECD treatment of unused capacity is the reference: where a party commits capacity to the group, the allocation of the unused-capacity cost follows the contract and the benefit analysis — it is not silently spread into the mark-up base, and it is not silently ignored. The contract’s capacity terms, the utilization data and the cost allocation are the documented triad.

The audit issues, in order of frequency

1. The cost base rebuilt — the TPO re-derives the operating cost from the accounts on its own lines (depreciation treatment, the overhead allocation basis, the intercompany charges) and the mark-up moves. The defence is the line-by-line base, stated and consistent.
2. The mark-up benchmarked fresh — the TPO’s pool (often Indian manufacturers only, often a different sub-process) gives a different range. The defence is the search design and the matrix — see defending the matrix.
3. The function re-characterized — “your engineer does more than conversion; you perform product development” — the function boundary (what the manufacturer does vs what the commissioning party’s R&D does) examined from the contract and the actual conduct. The defence is the functional record: the SOPs, the engineering scope, the IP ownership.
4. The capacity question raised — low utilization used to argue the mark-up is too high (the manufacturer should earn less on idle capacity) or too low (it should have earned the full-capacity return). The defence is the contract’s capacity terms and the utilization data.
5. The materials treatment — for contract manufacturing with the manufacturer’s own procurement, whether the materials sit in the mark-up base. The defence is the stated treatment, following the contract’s pricing structure.

The documentation

The contract (scope, inputs, IP, capacity terms, the pricing mechanism), the line-by-line cost base with definitions, the utilization data (actual vs designed capacity, the trend), the comparable pool and matrix, and the functional record that keeps the manufacturer’s function at conversion — because the moment the file cannot show the function is routine, the method moves from cost plus to something two-sided, and the economics move with it.

See also

• Cost Plus method guide
• Cost Plus vs TNMM
• Contract R&D — the adjacent fact pattern
• Tested party selection