What Is Obsolescence Risk in Inventory?
Obsolescence risk is the chance that inventory becomes unsellable before it is sold. A significant hidden cost for product businesses.
Key Takeaways
- Obsolescence occurs when inventory loses value faster than it can be sold
- Technology, fashion, and seasonal goods face the highest obsolescence risk
- Accounting requires you to write down inventory to net realisable value when obsolescence is likely
- Reducing buy quantities and improving demand forecasting are the primary mitigations
What obsolescence risk is
Obsolescence risk is the probability that inventory you hold today will become unsellable — or significantly less valuable — before you can sell it. A product becomes obsolete when it is superseded by a newer version, goes out of fashion, passes its expiry date, or loses relevance due to market changes.
High-risk categories
Technology products face obsolescence from rapid product cycles — last year's smartphone accessory may be incompatible with this year's phone. Fashion faces end-of-season obsolescence. Perishable goods face expiry risk that is both rapid and absolute. Regulated products face regulatory obsolescence if standards change.
The accounting treatment
Accounting standards require that inventory is carried at the lower of cost and net realisable value (NRV). If you have inventory you can only sell for less than you paid, you are required to write it down to NRV. This write-down hits the P&L as an expense. Failing to write down obsolete inventory overstates assets and understates costs.
Obsolescence provision
Prudent businesses maintain an obsolescence provision — a reserve estimating the expected write-down based on the age profile and risk category of current inventory. For example, a provision might reserve 5% of the value of stock over 6 months old, 20% over 9 months, and 50% over 12 months, based on historical data of how much stock in each age bracket ultimately fails to sell at full value.
Mitigating obsolescence risk
The primary mitigations are conservative buying (buying less to start, reordering quickly if it sells well), product lifecycle management (running down inventory before a model change or season end), early markdown or promotional activity on slow-moving lines before they become fully obsolete, and clear sell-through targets with price escalation triggers.