What it means
Every line on a balance sheet is a valuation decision. Inventory, buildings, brands, pension obligations and warranty provisions all have to be reduced to a single number, and the standards specify which measurement basis applies to each.
The common bases are historical cost, which keeps the original purchase price less any depreciation, and fair value, which is an estimate of the price in an orderly transaction between market participants today. A third family sits in between, including net realisable value for inventory and value in use for impairment testing, each defined for a particular purpose.
This matters because valuation drives reported profit, net assets, borrowing capacity and often executive bonuses. A write-down of inventory or goodwill reduces earnings immediately even though no cash has moved, and lenders watch these figures because loan covenants are usually written against them.
The mechanics vary by asset class. Inventory is carried at the lower of cost and net realisable value, receivables are reduced by an allowance for expected credit losses, and long-lived assets are tested for impairment when there are signs their carrying amount is not recoverable.
Two nuances catch people out. First, accounting valuation is not business valuation: a company's shares can be worth far more than its book net assets because internally generated brands and customer relationships are largely excluded.
Second, many valuations rest on management estimates, so two honest teams can reach different numbers and both be within the rules. Because estimates are involved, disclosure does a lot of work.
Companies are expected to explain the key assumptions behind material valuations, such as the discount rate used in an impairment test, so that readers can judge how sensitive the reported figure is to a change in view.
In practice
Real-world examples.
Example
A logistics firm tests its depot for impairment after a motorway closure cuts traffic. The depot's carrying amount is $4,000,000 but the value in use, based on discounted future cash flows, is $3,400,000, so a $600,000 impairment loss is recognised.
Example
A food producer values a batch of near-expiry stock at net realisable value rather than cost. The write-down is small in cash terms but pushes gross margin below the covenant threshold, prompting an early conversation with the bank.
Example
An investment fund holds listed shares that must be measured at fair value each quarter. Market prices fall in the final week of the quarter, so the fund reports an unrealised loss even though it has sold nothing and still expects the holding to recover. Investor relations spends the following week explaining why the loss is a measurement effect rather than a trading decision.
Formula
Calculation
For inventory, the rule is: Carrying value = lower of cost and net realisable value, where Net realisable value = estimated selling price less costs to complete and sell.
A furniture retailer holds a discontinued range that cost $500,000 to buy. It expects to sell the range for $560,000, but must spend $90,000 on refinishing, delivery and clearance advertising to shift it.
Net realisable value = $560,000 - $90,000 = $470,000. Because $470,000 is lower than the $500,000 cost, the inventory is carried at $470,000 and a write-down of $500,000 - $470,000 = $30,000 is charged to the income statement in the current period.Case study
Seen in the real world.
Consider Northgate Instruments, a fictional maker of laboratory equipment used here purely as an illustrative case. The company had capitalised $2,000,000 of specialised tooling for a product line that was selling slowly, and management insisted the tooling was still worth its book value because it had cost that much only two years earlier.
The auditors asked a different question: what future cash could the tooling actually produce? Discounted cash flow work using realistic order volumes supported a recoverable amount of $1,250,000, so a $750,000 impairment was recorded. Management disliked the hit but conceded that the cost paid two years ago said nothing about value today.
The practical consequence was useful. Because the tooling now sat at a realistic figure, the return on assets for that product line looked far worse, and the board finally approved the discontinuation decision it had been avoiding. In this illustrative case the write-down did not destroy value; it simply made an existing problem visible in the numbers.
Watch out
Common mistakes.
- Assuming the balance sheet shows what the business is worth, when it mostly shows what assets cost less what has been written off.
- Treating a valuation write-down as a cash cost, when it is a non-cash charge that reduces profit and book value but not the bank balance.
- Applying one measurement basis across the whole balance sheet, when standards deliberately use different bases for different items.
Questions
People also ask.
Why can two accountants value the same asset differently?
Many measurements depend on estimates such as future sales volumes, discount rates and useful lives, and reasonable people choose different assumptions.
Can an impairment be reversed later?
Under international standards most impairments other than goodwill can be reversed if conditions improve, while US rules generally prohibit reversal.
Does accounting valuation affect tax?
Sometimes, but tax authorities apply their own rules, so a book write-down is often not deductible until the loss is actually incurred.
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