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Quick Answer: A year-end inventory count lowers your business taxes by uncovering unrecorded shrinkage and unsellable stock that artificially inflate your ending inventory balance. Reducing that ending balance increases your Cost of Goods Sold (COGS) deduction, cutting your taxable income dollar-for-dollar and eliminating taxes on phantom profits.
Key Takeaways:
- Uncovering unrecorded shrinkage lowers your ending inventory, directly boosting your COGS deduction and slashing your taxable income.
- Writing down or scrapping obsolete inventory before December 31 turns dead shelf weight into an immediate current-year tax deduction.
- Adjusting your inventory numbers before the calendar flips locks in deductions and preserves working capital that cannot legally be recovered after year-end.
“I really look forward to counting inventory.”
Said no business owner ever.
And when it’s late December, it’s hard not to just open Shopify or Square, shrug, and decide the dashboard numbers are close enough.
Don’t make that mistake.
Every broken item dropped behind a shelf and every piece of dead stock gathering dust on your warehouse floor is an unrecorded loss. Left uncounted, you’ll pay taxes on profits you never actually pocketed.
Here’s a breakdown of how getting an accurate year-end inventory count could slash your taxable income.
How could a year-end inventory count lower your taxable income?
A physical year-end inventory count could lower your business’s taxable income by catching unrecorded inventory loss, like damaged items and dead stock that artificially inflate your ending inventory balance. Ending inventory is subtracted when calculating your Cost of Goods Sold (COGS), so a lower ending inventory balance gives you a larger COGS deduction. That higher deduction directly reduces your gross profit and trims your taxable income for the year.
To determine your Cost of Goods Sold (COGS), the IRS looks at the total inventory you had available throughout the year (what you started with plus everything you bought).
That entire amount has to land in one of two places: it is either still sitting on your shelves as unsold inventory, or it was sold and absorbed into your COGS.
Which means:
- A higher ending inventory shrinks your COGS deduction. That leaves a larger gross profit on your books, which creates a higher tax bill.
- A lower ending inventory produces a larger COGS deduction. That shrinks your gross profit and directly lowers your taxable income.
Any unsellable, damaged, or missing stock you uncover during your year-end inventory count needs to be removed from your balance sheet and moved into Cost of Goods Sold before the year closes.
Can small businesses expense inventory the year they buy it?
Even if you run your Texas small business on a cash basis, the IRS doesn’t let you deduct the cost of inventory until you sell it to a customer or write it off. Unsold stock sitting in your warehouse at year-end can’t wipe out this year’s taxable income.
Say an e-commerce owner checks their bank account around mid-month and sees $60,000 sitting there. Afraid of a painful tax bill in the spring, they decide to spend down their profit.
On December 28, they place a bulk order for $50,000 in new inventory, assuming they just bought themselves a $50,000 tax deduction for the current year.
And then April arrives. That $50,000 purchase did not trim their taxable income at all. Because those goods sat on warehouse shelves at midnight on December 31, the IRS classifies that money as an asset on your balance sheet. Not an expense.
The owner’s taxable income is still just as high as it was before the purchase, but their operating cash is gone.
The lesson here is, if you want to trim your taxable income before December 31, look at what’s already sitting in your warehouse.
When you count your stock, you uncover the broken merchandise and obsolete products you paid for months ago. Writing down or discarding that dead stock removes it from your ending inventory balance. And that pushes the cost straight into Cost of Goods Sold, lowering your tax bill.
How do you write off obsolete or damaged inventory before year-end?
You can write the goods down, or you can abandon them. Writing down goods to Net Realizable Value means you must actively discount the items and offer them for sale within 30 days. But if you want to claim a full abandonment write-off, you have to permanently dispose of the items. They must be physically destroyed so they can’t be sold.
You need to categorize your slow-moving stock before year-end so your books reflect the correct deduction. Here’s how the IRS treats different inventory conditions.
| Inventory Status | IRS Tax Treatment | Valuation Method | Mandatory Documentation |
| Normal Unsold Stock | Capitalized asset (No immediate deduction) | Cost basis | Standard inventory ledger |
| Subnormal Goods | Partial write-down to Net Realizable Value | Lower of Cost or Market | Evidence of public price reduction within 30 days |
| Scrapped Stock | Full deduction in current year | Zero value | Disposal receipts (like landfill tickets) |
| Charitable Donation | Cost basis deduction | IRC Section 170 | Form 8283 and a 501(c)(3) written acknowledgment |
Writing down goods
If you hold damaged or obsolete goods, tax law permits you to write them down to their “bona fide selling price” minus the cost to dispose of them. Doing so lowers their ending inventory value on your balance sheet. And that lost value moves into your current-year Cost of Goods Sold deduction.
But you can’t just declare an item to be worth half its price on a spreadsheet. A bona fide selling price requires an actual, open offering of the goods that ends no later than 30 days after your inventory date.
So, if you take inventory on December 31 and mark down winter coats from $100 to $30 on your books, you must publicly advertise those coats for $30 by January 30.
Scrapping or donating inventory
If an item has zero commercial value, scrapping it unlocks a complete deduction of its remaining cost basis against your current-year income.
The IRS strictly enforces abandonment intent here. You must completely surrender all rights to the property and physically discard it.
I tell my Harris County clients to protect themselves in an audit by gathering third-party proof of the disposal. Take photos of the items in a commercial dumpster. Keep your landfill weight tickets. Or save the invoice from a junk-hauling vendor.
Or, if you carry excess stock that’s brand new but unsellable because of shifting demand, consider donating it to a qualified 501(c)(3) nonprofit before December 31.
For pass-through entities, you deduct the lower of cost or fair market value, which flows through as a charitable contribution on Schedule K-1.
Texas C corporations get an enhanced deduction if they donate inventory specifically for the care of qualifying populations (like the ill or infants). That deduction equals the cost basis plus up to half the markup, capped at twice the cost basis.
How to do a year-end inventory count for tax write-offs
To execute an audit-proof inventory count, freeze operations, quarantine damaged stock, and conduct two-person blind counts without pre-filled software quantities. Reconcile variances and post the adjusting entry to Cost of Goods Sold before December 31. Then, archive signed count sheets and third-party disposal receipts to substantiate your deductions during an IRS exam.
1. Freeze operations
Halt all inbound deliveries and order fulfillment while you’re counting. Trying to count moving stock leads to double-counting and phantom discrepancies. Set aside any deliveries that arrive mid-count in a marked staging area and log them after you’re done.
2. Quarantine defective stock
Physically pull expired, broken, or obsolete items off your shelves before the count begins. If they stay in standard bins, counters will record them as full-value assets. Move them to a marked quarantine area to decide whether to scrap them or mark them down.
3. Run two-person blind counts
Provide count sheets listing only the SKU, description, and location, leaving the quantity blank. And pair counters in teams of two (one counts, one records) to help eliminate bias and counting errors.
4. Reconcile and post adjustments before Dec 31
Compare your verified physical counts against your inventory software. Calculate the net variance and post the adjusting journal entry to your books dated on or before December 31 (debiting COGS and crediting your inventory asset account).
This removes missing or unsellable inventory from your balance sheet and locks in your deduction for the current tax year.
5. Build your audit trail
The IRS audits write-offs years after the fact, so contemporaneous documentation is non-negotiable. Save a digital folder with:
- Signed, dated count sheets.
- Software variance reconciliation reports.
- Timestamped photos of scrapped goods and third-party disposal/dumpster receipts.
- Screenshots showing marked-down items actively offered for sale within 30 days.
Final thoughts
Let’s evaluate your inventory data and optimize your Cost of Goods Sold before the holiday and end-of-year rush makes you too crunched for time, so we can turn dead weight on your shelves into cash you keep in your business.
Let’s go ahead and get your year-end inventory review on the calendar:
FAQs
“What are the IRS rules for inventory write-downs?”
To write down inventory, the IRS requires you to prove that the goods have genuinely dropped in value. If you mark down unsellable or dated products to their actual current market value, you have to offer them for sale at that discounted price within 30 days of your count. If the products are worthless and can’t be sold, you have to permanently discard or destroy them before December 31 to claim the full cost as a deduction for that tax year.
“What are the best practices for identifying obsolete inventory items?”
The best approach pairs your software sales data with an actual walk through the warehouse. Pull an inventory report to pinpoint products that haven’t moved over the past six to twelve months, since dead stock locks up your operating capital. Once you have that list, physically inspect the shelves to pull out unsellable or broken items and move them to a separate holding space so your team doesn’t accidentally count them as valuable business assets on your final balance sheet.
“What are the tax implications of year-end inventory write-offs for small businesses?”
Writing off inventory directly lowers your taxable income by shifting the cost of dead stock into your Cost of Goods Sold deduction. When you clear out missing or unsellable products before December 31, your ending inventory balance drops, which reduces your taxable business profit dollar-for-dollar. This wipes out phantom profits (income you only appear to have made on paper), keeping real cash in your bank account instead of sending it to the tax authorities.
“What documentation is required for inventory disposal?”
To defend an inventory write-off during an IRS review, you need contemporaneous proof showing that the items were permanently tossed out before the year closed. Keep an internal disposal log detailing the specific items and their original cost, signed off by management at the time of destruction. Back this log up with independent proof, such as junk-hauler receipts or timestamped photos of the destroyed items in the dumpster.
“Can I use cloud-based services to streamline my year-end inventory write-off process?”
Modern cloud inventory and accounting platforms make year-end write-offs much faster by catching count discrepancies in real time. Tools like QuickBooks Online or dedicated inventory apps let your staff scan barcodes with mobile devices, flagging missing stock against what your books say you should have. Once your team confirms the variance, the software generates a clean reconciliation report, allowing us to approve the shrinkage adjustment and update your Cost of Goods Sold before December 31.