Stock obsolescence: catching dead inventory before the write-off

The causes are decisions, not accidents

Dead stock is usually traceable to a specific choice: a launch quantity built against an optimistic plan, a last-time buy sized without a firm demand commitment, a supplier minimum accepted to secure a price, an engineering change introduced without running down the superseded part, or a customer-specific item ordered without contractual cover. Recording the cause on each write-off is what turns a recurring financial event into a preventable pattern.

Detect ageing while it is still reversible

Waiting for the annual provision exercise is too late. Useful early indicators are stock with no movement over a defined period, cover far in excess of forward demand, items whose parent product has been discontinued, and last-time buys approaching the end of their support horizon. An ageing view segmented by class, reviewed on the planning cadence, gives commercial teams time to sell the stock while it still has a market.

Recovery routes, in descending order of value

Selling through at normal terms recovers most; discounting or bundling recovers less but preserves the customer relationship; returning to the supplier under a stock rotation clause recovers value if the agreement provides for it; brokers, secondary markets and clearance channels sit below that; and reclaiming components, recycling or disposal sit at the bottom. Each option is available for a limited window, and the window closes as the item ages, which is the practical argument for acting early.

Prevention lives upstream

The controls that actually reduce obsolescence sit before the stock exists: phase-in and phase-out plans that run down the outgoing part before the replacement arrives, contractual cover for customer-specific and last-time purchases, buffer parameters that decline as an item enters its decline phase, and a formal owner for every item's life-cycle stage. Provisioning policy records the loss; these controls are what prevent it.

Frequently asked questions

When should slow-moving stock be written down?

Accounting treatment follows the applicable financial reporting framework and should be agreed with finance and the auditors rather than set operationally. The management discipline is separate: identify non-moving stock early, decide its disposal route, and stop the parameters that keep replenishing it.

Is holding spares for discontinued products always obsolescence?

No. Support obligations and service revenue can justify holding stock that turns very slowly, provided the commitment is deliberate, its cost is understood and the horizon is defined. The problem arises when nobody has decided how long the obligation runs and the stock simply persists.

How can engineering changes be prevented from creating dead stock?

By tying the change's effective date to the run-down of existing stock and pipeline, or by explicitly funding the write-off as part of the change decision. Changes that go live without either produce an immediate obsolescence charge that nobody has owned.