Inventory Write-Down: Valuation and Reserves Under US GAAP

"Who in the world wants to spend a dollar to save 35 cents. It makes sense if you were going to do it because it's a necessary thing for your business to grow but it's just an expense."

— Source: r/Entrepreneur (949 upvotes)

Every brand accumulates inventory that does not sell. Old colors go out of style. A new competitor undercuts your price. A promotional campaign flops. Suppliers ship excess. What started as inventory becomes deadstock.

When inventory value declines below what the company paid for it, accounting rules require a write-down: a charge to the income statement that reflects the economic loss. It is not optional, and it is not a tax gimmick. It is a recognition that the asset is impaired.

This guide explains inventory write-downs under US GAAP, how to calculate them, and how they affect financial statements and taxes.

The 50-word definition

Write-downs happen for several reasons:

• Obsolescence: The product is old, out of season, or superseded by a new version. Demand is minimal.
• Market decline: The market price for the product has fallen (e.g., commodity goods, tech products with newer models).
• Damage or defects: Units are damaged, defective, or recalled. They must be discounted or destroyed.
• Overstocking: Demand forecast was too optimistic. Excess inventory can only sell if marked down heavily.
• Supply disruption recovery: Inventory purchased to hedge against supply risk is no longer needed, making it economically excess.

Write-downs are a recognition of economic reality: the company paid $50,000 for inventory it can now only sell for $30,000. The $20,000 loss must be recorded.

The core principle: Lower of Cost and NRV

Under US GAAP Accounting Standards Codification (ASC) 330, inventory is valued at the lower of (1) cost or (2) net realizable value (NRV).

This rule applies to inventory measured with any method other than LIFO or the retail inventory method, for example FIFO (first-in, first-out) and average cost (weighted average).

Cost is what you paid: purchase price plus inbound freight, duties, tariffs, and direct production costs (labor, overhead). Not including storage, handling, or distribution.

Net Realizable Value (NRV) is the expected selling price less the direct costs to sell:

• Current market price (what similar inventory is selling for)
• Minus estimated selling costs: commission, shipping, markdowns, promotional spend
• Minus disposal costs if the inventory will be salvaged or destroyed

If NRV is less than cost, the inventory is impaired, and a write-down is required.

Special rule: LIFO and retail methods use "lower of cost or market"

Under ASC 330, companies using LIFO (last-in, first-out) or the retail inventory method continue to use "lower of cost or market" instead.

"Market" under this rule is defined narrowly as the current replacement cost (what it would cost to buy identical inventory today), capped at NRV and floored at NRV minus a normal profit margin.

For consumer brands: many use FIFO or average cost, so lower of cost and NRV is the test that applies.

Determining NRV for consumer goods

• Active sales channel: If the product is still selling at full price, NRV is near full price (selling price minus selling costs).
• Slow-moving: If sales are slow, estimate a markdown. Example: full price is $50, but you forecast 40% markdown required to move the inventory. NRV = $30 - 10% selling cost = $27.
• Obsolete: If the product is slow-moving or out of season, estimate deep discounts or clearance value. Example: full price $100; estimated clearance price $20; disposal costs $5. NRV = $15.
• Damaged or defective: If units are damaged but saleable, reduce NRV by the repair or refurbishment cost. If unsaleable, NRV = $0 minus disposal cost.

The key: NRV must be reasonable and supportable. Auditors will challenge NRV estimates that are too optimistic. Document assumptions.

Formula

Illustrative example: Active product

• Inventory: 500 units of a bestselling skincare serum
• Cost basis: $20/unit (FIFO)
• Current retail price: $60/unit
• Est. shipping cost (seller pays): $3/unit
• Est. marketplace or transaction fees: 8% × $60 = $4.80/unit
• Expected selling costs: $3 + $4.80 = $7.80/unit

NRV per unit = $60 - $7.80 = $52.20
Total NRV = 500 units × $52.20 = $26,100
Cost basis = 500 units × $20 = $10,000
Conclusion: NRV ($52.20) > Cost ($20). No write-down required.

Illustrative example: Slow-moving product

• Inventory: 800 units of seasonal apparel (end-of-season overstock)
• Cost basis: $15/unit (FIFO)
• Regular retail price: $45/unit
• Est. clearance markdown: 50% off = $22.50/unit selling price
• Selling costs: $1.50/unit (handling, shipping, fees)
• Estimated additional promotional spend: $1/unit (discounts, ads to move the units)

NRV per unit = $22.50 - $1.50 - $1.00 = $20.00
Total NRV = 800 units × $20 = $16,000
Cost basis = 800 units × $15 = $12,000
Conclusion: NRV ($20) > Cost ($15). No write-down required.

Illustrative example: Obsolete inventory

• Inventory: 200 units of discontinued color (now unsaleable at full price)
• Cost basis: $18/unit (average cost)
• Current market: No active buyers. Only salvage/closeout available.
• Estimated salvage price: $3/unit
• Disposal/shipping cost: $1/unit
• Estimated units lost or damaged before sale: 5% (10 units recover nothing)

Units sold for salvage: 200 − 10 = 190 × $3 = $570
Disposal/shipping cost: 200 × $1 = $200
Total NRV = $570 − $200 = $370 (about $1.85/unit across 200 units)
Cost basis = 200 units × $18 = $3,600
Write-down required: $3,600 − $370 = $3,230

This inventory is severely impaired and must be written down to $370.

What is a valuation reserve?

A valuation reserve (or allowance) is a contra-asset account that reduces the book value of inventory without physically removing units from the system. It is the standard way to account for inventory impairment.

Balance sheet entry:

• Assets: Inventory (gross) $1,000,000
• Less: Inventory Valuation Reserve ($150,000)
• Net Inventory: $850,000

The reserve sits on the balance sheet until the inventory is sold or disposed of. When units are sold, the reserve for those units is released against inventory, so the reduced carrying amount (cost minus reserve) flows to COGS.

Recording the reserve

When inventory is identified as impaired, the journal entry is:

• Debit: Cost of Goods Sold (or Inventory Impairment Expense) $150,000
• Credit: Inventory Valuation Reserve $150,000

The debit hits COGS and reduces gross profit (and net income) in the period the impairment is identified.

When to record the reserve

• Quarterly close: Perform a physical inventory count (or cycle count) and compare cost to NRV. Identify impaired units.
• Ongoing monitoring: Track slow-moving SKUs and mark down prices as needed. When a SKU is marked down, assess if NRV is now below cost.
• Year-end close: Perform a full inventory audit. Create or adjust valuation reserves for all impaired items. This is when auditors scrutinize reserves most closely.

Best practice: maintain a valuation reserve schedule that lists each impaired SKU, the quantity, the original cost, the estimated NRV, and the reserve amount. Update monthly.

Entry 1: Initial write-down (example)

SKU XYZ: 100 units at $50 cost, current NRV is $15/unit. Write-down: (100 × $50) - (100 × $15) = $3,500.

Impact: COGS increases by $3,500, reducing gross profit by $3,500 (before tax). Net income drops by approximately $2,625 (assuming 25% tax rate).

Entry 2: Recovery later in the same fiscal year

Under US GAAP, a write-down normally sets a new cost basis that is not reversed later. The exception: a write-down taken in an interim period (Q3 here) can be recovered in a later interim period of the same fiscal year, up to the amount written down. (IFRS, under IAS 2, allows reversals more broadly.) In Q4 of the same fiscal year, NRV for SKU XYZ recovers to $25/unit. The reserve should now be (100 × $50) − (100 × $25) = $2,500, so release $1,000.

Impact: COGS decreases by $1,000, increasing gross profit by $1,000. This partially reverses the Q3 write-down. Once the fiscal year closes, the $25 carrying amount becomes the new cost basis and cannot be written back up.

Entry 3: Sale of impaired inventory

When impaired inventory is sold, record revenue as usual and release the reserve against inventory, so COGS reflects the reduced carrying amount. Example: SKU XYZ, 100 units sell for $22/unit (total revenue $2,200). Cost basis is $50/unit ($5,000), and the reserve is $2,500, so the carrying amount is $2,500 ($25/unit).

Both entries balance: $2,200 = $2,200, and $2,500 + $2,500 = $5,000. Gross profit on the sale is $2,200 − $2,500 = −$300, because the units sold for $22, below the $25 carrying amount. Across all three entries the total loss is $3,500 − $1,000 + $300 = $2,800, which equals the $5,000 cost minus the $2,200 received.

Example 1: Beauty brand with seasonal overstock (DTC)

Illustrative example:

• Inventory: 2,000 units of summer body lotion (purchased March for June sales)
• Cost basis: $12/unit (FIFO)
• Total cost: $24,000
• Sales during summer: 1,200 units at $24/unit
• Current date: September 30 (end of summer season)
• Remaining inventory: 800 units
• Current market: Summer products not selling. Retailers are stocking fall/winter.
• Est. clearance markdown: 65% off retail = $8.40/unit

Calculate NRV

• Estimated selling price: $8.40/unit (65% markdown)
• Estimated selling costs: $0.50/unit (platform fees, packaging)
• NRV per unit: $8.40 - $0.50 = $7.90/unit
• Total NRV: 800 units × $7.90 = $6,320
• Original cost (800 units): 800 × $12 = $9,600
• Write-down: $9,600 - $6,320 = $3,280

Journal entry

Impact on Q3 financials: COGS increases by $3,280, so gross profit decreases by $3,280. That erases 22.8% of the $14,400 gross profit the lotion earned over the summer (1,200 × ($24 − $12)). If the loss is deductible in the same year, at an assumed 25% tax rate it cuts taxes owed by about $820 (see the tax FAQ on timing).

Example 2: Amazon seller with competitive price pressure

Illustrative example:

• Product: Private-label fitness tracker band
• Inventory in FBA: 5,000 units
• Cost basis: $8/unit (average cost method)
• Total cost: $40,000
• Selling price (Aug): $29.99/unit
• Amazon referral fee (illustrative): 15%
• Current situation (Sept): New competitor launched a similar band at $19.99
• Price cut required to remain competitive: $24.99/unit
• Expected sales pace after the price cut: slower than before (affects timing, not the per-unit NRV)

Calculate NRV

• Est. selling price (post-price cut): $24.99/unit
• Amazon referral fee (15%): $3.75/unit
• FBA fulfillment fee (est.): $3.50/unit
• Net to seller: $24.99 - $3.75 - $3.50 = $17.74/unit
• NRV per unit: $17.74 (if slower sales add storage or removal fees, deduct those as selling costs too)

NRV is the expected net selling amount, $17.74/unit. A slower sales pace is not a reason to multiply NRV by a probability; it matters through extra selling costs such as storage fees. Cost is $8/unit.

Conclusion: NRV ($17.74) > Cost ($8). No write-down needed, but unit margin after fees has compressed from $13.99 ($29.99 − $4.50 referral − $3.50 FBA − $8) to $9.74 ($17.74 − $8).

Even at $19.99, NRV would be $19.99 − $3.00 referral − $3.50 FBA = $13.49, still above cost. A write-down only arises if the net amount after all selling costs drops below $8, so test again each quarter with current prices and fees.

Example 3: Wholesale order cancelled

Illustrative example:

• Inventory: 3,000 cases of apparel ordered for a retail partner
• Cost basis: $120/case (landed cost, FIFO)
• Total cost: $360,000
• Situation: the retail partner filed for bankruptcy and cancelled the order; the cases are still in your warehouse
• Option A: sell to an off-price buyer at $24/case
• Option B: the supplier takes the goods back less a 25% restocking fee: $120 × 75% = $90/case
• Estimated direct return costs: $5/case (logistics, inspection)

Calculate NRV

• Best realistic route: return to supplier at $90/case
• Less return logistics: $5/case
• NRV per case: $90 - $5 = $85/case
• Total NRV: 3,000 × $85 = $255,000
• Original cost: 3,000 × $120 = $360,000
• Write-down: $360,000 - $255,000 = $105,000

Journal entry

Impact: COGS increases by $105,000, 29% of the $360,000 cost. This is a significant hit to profitability. If deductible in the same year (for example, once the goods are returned), at an assumed 25% tax rate it cuts taxes owed by about $26,250.

Consumer brands carrying inventory across DTC, Amazon, and wholesale face multiple impairment risks:

• Seasonal overstock: Forecast too high for a season; inventory left unsold at end of season.
• Channel mix shifts: Inventory ordered for wholesale channel becomes obsolete if the retail partner fails or delists the product.
• Competitive pressure: New competitor undercuts price; brand must discount to move inventory.
• Damage in transit: Inventory damaged during ocean freight, inbound processing, or 3PL handling.
• Product recalls: A safety issue or quality problem requires full or partial inventory write-off.
• Obsolescence: New product launch cannibilizes sales of older SKUs; old inventory must be marked down.

Best practice for multi-channel brands: assess inventory NRV monthly by channel and SKU. Track which SKUs are slowing, which are being discounted, and which are at risk of impairment. Set a documented reserve policy, for example reserve percentages by age or sell-through band, based on your own markdown and clearance history, and apply it consistently.

Inventory write-downs are not exciting, but they are a core piece of accurate financial reporting. They force brands to face the reality: some inventory will not sell at cost, and that loss must be recorded.

The brands that struggle with write-downs often do so because they do not know the true NRV of their inventory. They hold inventory at cost on the books, hoping to sell it, and then get surprised at month-end or year-end when auditors demand a reserve.

The solution: link inventory management to financial close. Track NRV by channel and SKU monthly. When a SKU is marked down or moves to clearance, update the reserve that month. By the time year-end arrives, reserves are current and there are no surprises.