Cost-Down Agreement

Agree a learning-curve cost-down with key suppliers: annual percentages, shared gains, no renegotiation theater.

Time45 min
FormatSmall group
StageNegotiate

Cost-Down Agreement: what it is and why it works

A Cost-Down Agreement replaces the annual price fight with a pre-agreed cost reduction path. Buyer and supplier first baseline the current cost structure together, then set a curve of annual reductions based on expected learning and productivity: labor and machine content falls as cumulative volume grows, and process improvements reduce scrap and cycle times. The agreement defines how gains are shared, for example a fixed annual percentage plus a split of any savings from joint projects, how progress is reviewed each quarter, and the specific conditions, such as major volume or commodity changes, that allow reopening.

The method works because it turns negotiation energy into improvement energy. When the price path is known, the supplier is motivated to beat it, since gains above the curve are partly kept, and the buyer can plan target costs years ahead. Grounding the curve in learning rates and measured productivity keeps it credible; arbitrary percentage demands tend to be absorbed by margin cuts or quality erosion. Cost-down curves come from lean supply practice and the application of learning curves to purchased parts. The agreement depends on the transparency built through Open-Book Costing, uses the Learning Curve to set realistic rates, and is framed during Negotiation Preparation as a multi-year trade.

What you need

A transparent cost baseline agreed with the supplier
Volume forecast and expected cumulative volume by year
Estimated learning rate and productivity gains for the cost elements
Commodity exposures to handle through indexation rather than the curve
A proposed sharing rule and review cadence

What you get

An annual cost-down curve by cost element and for the total price
A written sharing rule for savings above the curve and from joint projects
Quarterly review format and metrics
Reopening conditions defined in advance

When to use it

When every price discussion restarts from zero each year.

How to do it, step by step

Baseline the current cost structure with the supplier, transparently.
Set an annual cost-down curve from learning rates and productivity.
Define the sharing rule: how gains split between you two.
Review progress quarterly against the curve, not against moods.
Renegotiate only when assumptions change materially.

Worked example: Three-year cost-down on machined compressor parts

Illustrative scenario — figures are realistic but not from a real company.

An air compressor manufacturer buys machined crankcases and connecting rods from a single supplier, about $4.2 million a year. Each renewal had turned into a months-long argument ending with a flat price. Both sides agreed to try a cost-down curve.

They baselined the price: 38% material, 45% labor and machine time, 17% overhead and margin. Material was taken out of the curve and handled with a published steel and aluminum index.
Cumulative volume was expected to double roughly every two years. Using a 90% learning rate on labor and machine content gives a yearly factor of about 0.90^0.5, or a 5% annual reduction on that 45%, around 2.3% of price.
They added 0.7% a year for productivity projects on overhead and set the curve at 3% a year of total price, with material moving separately by index.
Savings from joint engineering changes would be split 50/50 for the first year, then passed through.

Result. In the first year the supplier reached 3.6% by automating a deburring step and kept the gain above the curve. A joint fixture change on the connecting rods saved another $58,000, split equally. Quarterly reviews took two hours instead of the previous months of renewal meetings.

Open it in the FieldKit Design to Cost app → Get the Design to Cost template pack — join the waitlist

Common pitfalls and how to avoid them

Setting the annual percentage by decree without a cost basis.Derive the curve from the baseline, learning rates and planned productivity projects, and show the arithmetic.
Including volatile commodities in the curve.Handle material through a separate index clause so the curve reflects only controllable costs.
Reviewing against feelings rather than data.Review quarterly against the curve with agreed metrics, and record deviations with causes.
Reopening the agreement for every small change.Define materiality thresholds in the contract, such as a volume change beyond an agreed band, and reopen only when they are crossed.

Frequently asked questions

What is a typical annual cost-down percentage for suppliers?

There is no universal figure; it depends on the share of cost that can learn, the volume growth and the maturity of the process. A mature, stable part may justify very little, while a new part ramping up may justify more. Derive the number from the cost structure, learning rate and planned improvements rather than from a standard demand.

How do you share cost savings with suppliers?

Common rules include a guaranteed annual reduction with the supplier keeping gains above it, a percentage split of savings from supplier-proposed projects for a set period, or a split of savings from joint engineering changes. Write the rule down, including how savings are measured and when they pass fully to the price.

Can learning curves be applied to purchased parts?

Yes, to the portion of the supplier's cost that learns, mainly labor, machine time and process-related scrap. Material, purchased components and fixed overhead usually do not follow the same curve. Apply the learning rate only to the relevant share and handle the rest with indexation or separate agreements.

Origin

Cost-down curves and supplier agreements — lean supply practice; learning-curve application.

Used in these playbooks

Sourcing cost-push month 1 month

One month focused on bought-in cost: pareto the spend, substitute materials, settle make-or-buy and lock a cost-down curve with key suppliers.

Related methods

More in “Negotiate”

Align suppliers on real costs: models, openness and prepared plans.