Inventory write-off vs write-down: where the loss actually lands

The 60 phone stands in the discontinued color are still on your shelf, still carried on your balance sheet at $4.80 each, and still lying to your profit and loss statement. Inventory write-off accounting exists to correct that. Two terms do the work: a write-down recognizes a partial loss of value — stock you'll recover something on, just less than cost. A write-off removes stock whose value is zero. Both hit the P&L on the day you book them, not when the units finally sell or leave the building, and which one applies decides the entries you make. Here's the distinction, the journal entries in plain language, a worked liquidation, and where the number lands at year-end.

Write-down vs write-off: the actual difference

The distinction that matters for your books: a write-down says "these units are worth less than I paid." A write-off says "these units are worth nothing." Everything else — the accounts you debit, the tax mechanics, the timing argument with your bookkeeper — follows from that one line.

The journal entries, in plain language

Writing down inventory. Steven Bragg's AccountingTools guide to inventory write-downs (page dated October 2026, accessed October 2026) gives the three patterns you'll actually use:

• Insignificant write-down: debit cost of goods sold, credit inventory. The loss folds straight into COGS.
• Significant write-down: debit a separate "inventory write-downs" expense account, credit inventory. The account rolls into COGS on the P&L, but keeping it separate leaves a visible trail of how much value you destroyed this year.
• Reserve approach: when you've identified stock as obsolete but haven't disposed of it yet — the decision happens in October, the liquidator pays in January — debit COGS and credit a "reserve for obsolete inventory" contra account against inventory. The loss lands in the year you recognized the problem, not the year the disposal closes.

Their canonical example: an item that cost $100 with a scrap value of $15 takes an $85 write-down. The mechanics are identical at your scale.

Writing off inventory. AccountingTools' write-off guide (page dated February 2026) describes a single entry: debit COGS — or a separate account rolled into COGS — and credit inventory for the full carrying value. Two things worth knowing. First, writing off is not the same as physically discarding: the accounting event removes the value; the pallet can sit in the corner another month until the disposal pickup happens. Second, the same source notes that write-offs of obsolete, damaged, or otherwise unsalable inventory are generally deductible when properly substantiated — that's educational context, not tax advice, and your CPA makes that call.

Worked example: liquidating 60 phone stands

All figures illustrative. The SKU: a phone stand in a discontinued color, 60 units left, unit cost $4.80. Book value: 60 × $4.80 = $288.

A liquidator offers $1.20 per unit for the lot — $72 of recoverable value. The value loss:

Write-down = $288 − $72 = $216 (60 units × $3.60 of lost value each)

The entry, using the significant-loss pattern:

Book value drops from $288 to $72. When the liquidator pays and the units ship, the sale books $72 of revenue against $72 of cost — zero margin on the sale itself, because the loss was already recognized. (If $216 is immaterial to your store's year, the insignificant pattern is equally correct: debit COGS $216 directly and skip the separate account. Significance is a judgment about your financials' size, not a rule with a threshold.) If you'd skipped the write-down and recognized full cost at sale instead, the same $72 sale would show a −$216 loss on that line. Same total, different period: booked now, the loss shows in the year you knew the stock was dying; booked later, it pollutes the month of an otherwise ordinary sale, and your year-end inventory sits overstated in the meantime.

The year-end effect rides on the inventory identity — COGS = beginning inventory + purchases − ending inventory, the mechanism behind why purchases and COGS diverge. Ending inventory $216 lower means COGS $216 higher for the year, with no additional cash involved. The cash left back when you bought the stands; the write-down just admits part of it isn't coming back.

If the disposal won't close until January, the reserve approach books the $216 into this year instead: debit COGS $216, credit reserve for obsolete inventory $216, then clear both when the sale settles.

Where the number lands at tax time (mechanism, not advice)

IRS Publication 334 describes the machinery for inventory businesses: inventory is valued at the beginning and end of each tax year, and the change flows through cost of goods sold — on a Schedule C, that's line 42. A write-down that lowers your year-end inventory value therefore raises COGS and lowers taxable income for the year you booked it. That's the whole mechanism. There is no special "write-off form" — just a lower ending number, which is why the write-down has to be in the books before the year closes.

Two boundary cases the same framework covers:

• Donated inventory is removed from opening inventory rather than run through COGS — it follows contribution treatment, a different line with different rules than a liquidation sale.
• Deductibility depends on substantiation — records showing what was obsolete or damaged, when, and why: aging reports, count sheets, disposal receipts. Per the AccountingTools write-off guide (February 2026), obsolete/damaged/unsalable write-offs are generally deductible when properly substantiated.

This section describes how the mechanism works, not advice for your return. Write-down timing, valuation method, and donation treatment interact; a CPA should make the final call on yours.

Book it when you know, not at year-end

A write-off is usually only "surprising" if nobody was watching the stock age. Merchants who avoid year-end shocks run a small cadence instead:

1. Quarterly: run an inventory aging report and flag anything with old receipt dates and falling velocity — the aging report guide covers the buckets. Anything on the wrong side of 180 days gets a decision, not a deferral.
2. At the decision: pick a channel — liquidation lot, outlet drop, donation — from the dead-stock disposal guide, and write down to that channel's recoverable value at that moment.
3. At the count: your year-end inventory count produces the number the tax formula consumes; the count procedure decides whether that number is real. A write-down the count never saw is an inventory error, not a strategy.
4. In the books: use the entries above. Significant losses get their own account so the year's value destruction stays visible instead of hiding inside COGS. Coordinate the timing with your bookkeeper before the count closes — a write-down booked after year-end usually belongs to the following year, which is exactly the period you didn't want it in.

Your inventory valuation method sits underneath all of this — it sets the unit cost the write-down is measured against, so the same shelf of stock can carry a different book value depending on how you value it.

A limitation from our side, stated plainly: InventoryX doesn't track inventory value or produce write-down entries — valuation accounting is out of scope for V1. What it does is upstream of this article: a weekly Buying List built on honest reorder math, so less stock gets over-bought in the first place.

Common questions

What's the difference between an inventory write-down and a write-off? A write-down records a partial loss — the stock still has recoverable value, and inventory is reduced by the gap between cost and that value. A write-off removes stock worth zero — damaged, expired, lost — at full carrying value. Both hit the P&L immediately when booked, not when the units are physically disposed of.

Is an inventory write-off tax deductible? Write-offs of obsolete, damaged, or unsalable inventory are generally deductible when properly substantiated (AccountingTools, February 2026). Mechanically, a lower year-end inventory value flows through COGS — Schedule C line 42 — under IRS Pub 334. Substantiation and timing rules apply; this is educational, and a tax professional should confirm your specific case.

Do I have to physically throw stock away to write it off? No. The accounting write-off removes value from your inventory account; the physical disposal is a separate event that can happen later. AccountingTools notes the two are commonly separated — stock can be written off in one period and then discarded, donated, or liquidated in another.

Which account do I debit for an inventory write-down? Debit COGS if the amount is insignificant. For a significant loss, debit a separate "inventory write-downs" account that rolls into COGS. If stock is identified as obsolete but not yet disposed of, use the reserve approach: debit COGS, credit a "reserve for obsolete inventory" contra account (AccountingTools, October 2026).

What happens to donated inventory in the accounting? Donated inventory is removed from opening inventory rather than flowing through COGS — IRS Pub 334 routes it as a contribution, which is a different line with different rules than a liquidation sale. Book the removal so your year-end inventory reflects it, and let your tax preparer handle the contribution treatment.

Next step

This week, pull the ten SKUs with the oldest receipt dates and put a recoverable value on each — a liquidation offer, a discount-channel price, or zero. Anything where that value sits below cost gets an entry from the table above before year-end, at whatever size the gap is. If the disposal is the part you're stuck on, the disposal channels, ranked by speed is the next read.