Thor Power Tool Co. v. Commissioner
Headline: Inventory and bad-debt accounting rules upheld, blocking a manufacturer's large write-down and restricting reserve deductions, making it harder for businesses to claim tax reductions without objective, verifiable evidence.
Holding: The Court affirmed the IRS’s denial of a tool maker’s inventory write-down and most of its bad-debt reserve increase because the company lacked the objective evidence required by tax rules.
- Requires objective evidence for tax inventory write-downs.
- Limits deductions for unverified increases in bad-debt reserves.
- Lets IRS use past charge-off formulas to recompute reasonable reserves.
Summary
Background
A company that makes hand-held power tools wrote down about $926,952 of what it called "excess" inventory in 1964 and claimed the loss for tax purposes. In 1965 the same company increased its bad-debt reserve and claimed a $136,150 deduction. The IRS disallowed the inventory write-down and allowed only part of the bad-debt deduction. The Tax Court and the Seventh Circuit upheld the IRS, and the case reached this Court for final review.
Reasoning
The central question was whether the company’s accounting moves "clearly reflected" its taxable income. The Court explained that tax rules define inventory "market" as replacement cost and allow lower values only with objective proof, like actual sales, offers at reduced prices, contract cancellations, or evidence of defective goods. The company continued to hold and sell many items at original prices and provided no objective records, so the write-down violated the tax regulations even though it followed general accounting practice. On the bad-debt issue, the IRS used a six-year moving average formula (the Black Motor approach) to set a reasonable reserve addition. The Court held the company failed to show that its recent experience was so atypical that the formula produced an arbitrary result, so the IRS did not abuse its discretion.
Real world impact
The decision makes clear that businesses cannot rely solely on internal estimates or general accounting practices to reduce taxable income. Taxpayers must produce objective, verifiable evidence to support inventory write-downs, or face disallowance. Similarly, adjustments to bad-debt reserves can be recomputed by the IRS using established historical formulas unless the taxpayer proves those formulas are unreasonable in the specific case.
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