Inventory Aging: Report, Formula & Ways To Reduce Aged Stock

June 15, 2022
8 min read

In this article:

What is aged inventory? How do you calculate aging stock? And, most importantly, how do you get rid of it?

Staying in stock is the goal. But not if that means never selling through your products. When that happens, you’re left with aged inventory. 

Aged inventory ties up cash and takes up pivotal warehouse space. And the longer these items sit, the more expensive it gets. 

Luckily, ecommerce brands can track aging inventory and take proactive measures before this inventory wrecks your margins. Plus, with the right processes, you can even avoid the issue altogether. Here’s how.

What is aged inventory?

Aged inventory refers to low-demand products that sell slowly or don't sell at all. These items are problematic for retail brands' financial health because they tie up working capital in unsold merchandise and collect expensive carrying costs that shrink profit margins.

What is an inventory aging report?

An inventory aging report (sometimes called an aged stock report) is a financial report that measures the average number of days inventory sits unsold in your warehouse.

Brands can use this report to identify slower-moving SKUs, then implement strategies to increase inventory turnover ratio and prevent those items from turning into dead stock

Typically, aged stock reports are relatively simple and list:

  • Your SKU variants
  • Number of units available per SKU
  • Average inventory age of those units

You can generate these reports manually using spreadsheets and routine inventory audits. However, this approach is tedious, time-consuming, and prone to human errors. So, top retail brands use inventory management software or ops optimization tools like Cogsy to automatically generate these reports in real-time.

Why is aging your inventory important?

Knowing the age of your inventory empowers you to make smart buying decisions and protect your brand's bottom line. Here's how.

Identifies slow-moving and unsellable products

When you regularly run an aging inventory report, you can identify which products turnover slowly and which aren’t selling. 

This empowers you to get ahead of the problem before those products turn into dead stock. How? By discounting the SKU, adding it to product bundles, or completely remarketing the aging items.

Offers insight into customer demand

Knowing your stock’s age provides valuable insights into your customers’ demand. And you can use these insights to build more accurate inventory plans based on what customers actually want (or don’t want). 

For instance, say a SKU turns over super fast. That means demand is high, and you might want to order a bit more safety stock to avoid a stockout situation. Meanwhile, if you don’t sell a ton of a SKU, then demand is low. So, you don’t want to order a ton more of that item, only for it to turn into dead stock.

Enables informed decision-making

Knowledge is power, so they say. And knowing your stock age is no different. 

Knowing which of your items are slow-moving or unsellable, you’re empowered to make informed decisions to increase demand for those items (and subsequently increase your revenue). 

This might mean marketing those slow-moving items to a new audience, bundling them with more popular SKUs, or discounting their retail price.

Helps anticipate potential cash flow issues

Inventory that just sits in your warehouses ties up working capital and racks up holding costs. And ultimately, it slows down your cash flow. 

Think about it: Couldn’t that working capital be put to better use in another part of your business? Like acquiring new customers, testing a new channel, or developing new products. 

But if it’s already been invested in inventory, you have to wait until that inventory sells. But if it’s not selling… 

By identifying aging inventory, you can prevent tying up more capital in slow-moving SKUs. Or maybe even unclog cash flow by eliminating unsellable products from your offerings.

Reduces inefficiencies and prevents profit loss

An aging inventory report helps brands identify inventory inefficiencies before they become bigger issues. 

For example, a product might not sell well because of quality issues. But the brand won’t know until they identify that the inventory is aging longer than other SKUs. 

Meanwhile, brands that run stock age reports likely will identify this quality problem. And they can switch suppliers before overstocking damaged goods or redesign a higher quality version of the product. That way, they're not stuck accumulating carrying costs that’ll wreck margins and lower their gross profits.

How to calculate stock age with the age of inventory formula

To calculate your stock age, use the average age of inventory formula: 

average age of inventory = (average inventory cost / cost of goods sold ) x 365 days

In this formula: 

  • Average inventory cost is the average valuation of your inventory at its present level. 
  • Cost of goods sold (COGS) is the average costs associated with selling that product, including raw materials, amount of capital invested in inventory, and labor costs. 

For example, if a company's average inventory cost is $100,000 and its COGS for that inventory is $500,000, the average inventory age would be 73 days. 

Average inventory age = ($100,000 average inventory cost / $500,000 COGS) x 365 days = 73 days

The higher your average inventory age is, the longer it takes to sell through product, and the higher your holding costs will be. Meanwhile, the lower this number is, the higher your demand and the more diligent you need to be about reordering in time to avoid a stockout.

4 best ways to reduce aging inventory

Understanding the average age of your inventory helps business owners identify low-performing SKUs, better predict customer demand, and lose less capital to the wrong products. But only if they use that information to reduce their aging inventory. Here's how you can do that.

1. Streamline communication between warehouse and purchasing

With inventory management metrics like aging inventory, you keep a pulse on which SKUs you have too much of or aren't selling quickly. And you don't buy more of those items, racking up holding costs. But you need to communicate this decision to your purchasing and warehouse management teams. 

That way, your purchasing team doesn't unknowingly reorder more of that item number. And your warehouse management team knows that more inventory isn't on its way, and they can use that space for other products (this small gesture can seriously improve your fulfillment relationships).

2. Perform regular inventory audits

Routine inventory audits ensure your stock records match what's actually sitting in your warehouse. Not only does this improve inventory accuracy, but it can provide visibility into what items aren't moving (leading to better inventory control).

This way, you know what SKUs perform well and which ones are not. From there, you can decide how to reduce (or eliminate) the low-demand inventory – like by hosting a marketing event to increase demand for your product.

3. Investigate reasons behind low sales volumes

When SKUs aren't selling, there's probably a good reason why. Common causes include seasonality, website placement, or changing consumer trends. 

Understanding the cause empowers you to make smarter inventory management decisions. For instance, you might adjust your purchasing decisions or marketing promotions to shed the excess aged inventory.

4. Improve demand forecasting

Inaccurate demand forecasting is the #1 reason for aging inventory — especially when you wrongly assume a slow-moving SKU is more popular than it is. But when you make operational plans using real-time, synchronized data, you can make smarter inventory purchases. 

For instance, Cogsy keeps a 24/7 eye on your inventory. So, as soon as product demand drops, the tool adjusts your inventory plan accordingly. That way, you're not reordering products that won't sell.

What can you do with aged stock?

No brand perfectly avoids inventory aging. So, how can you get rid of the slow-moving stock before it's too late?

Offer discounts and product bundles

Running a marketing promotion is the most common way to eliminate aging stock. This includes strategies like discounting the SKU temporarily, bundling the item with top-performers, or (if you're discontinuing the item) putting it on clearance. 

Take Wayfair, for example. The online furniture retailer sells thousands of SKUs — many of which are seasonal. And after its season, those SKUs quickly become aged inventory. 

So, the furniture dealer offers an annual warehouse clearout sale. During the event, aging inventory sells for up to 70% off before being discontinued. To further entice buyers, they even call out that the items are in "short supply" in the advert.

Source: Wayfair

Of course, 70% off is an extreme example. One that likely ends in a loss for Wayfair. So, why do they run these promotions? Because making something off these products is better than not making anything at all – especially when the longer these items sit unsold, the more expensive they become.

Make tweaks to the product listing

The product detail page (PDP) is the lifeblood of your store. The page's photos, description, location, and more all influence whether someone converts. 

So, if a product isn't selling well, consider making small tweaks to its product page. For instance, you might try: 

  • Clearly calling out the differentiators and keywords above the fold
  • Test new photos, ideally ones that showcase humans using the product
  • Adding more details to the product description
  • Add more social proof (like reviews and testimonials)
  • Move the call to action higher up or switch up the CTA verbiage

Cross-sell aged stock

Cross-selling invites customers to buy complementary products based on the items they've looked at or put in their cart. And cross-selling is proven to increase sales by 20%. This makes it a great strategy to get rid of your aging inventory. 

Take Parade, for example. When customers look at their cart, the DTC underwear brand prompts them to "fill their drawer." The company then recommends 4 other items the customer might also be interested in. However, unlike most underwear brands that recommend buying "more of the same," Parade prioritizes limited-edition drops to prevent the inventory from aging. 

Source: Parade

Similarly, Dollar Shave Club sends subscription customers, prompting them to "toss more in" before their refill ships. This cross-selling technique allows the razor brand to promote less-popular items as package add-ons. And hopefully, eliminate some slow-moving SKUs by marketing them to already loyal customers. 

Get rid of aged stock

Some suppliers allow brands to return excess stock within specific periods. So, check your contract terms for your vendor's return process. Send the aged stock back if you're still within those term limits. 

If not, you can always donate that inventory to charity for a tax deduction if all else fails. For one, this can lead to good PR compared to simply writing off the items as dead stock. But plenty of organizations would also really benefit from your donations. 

If you are outside the return data and the product is not donate-able, you can get rid of the aged inventory by:

  • Selling those products to inventory liquidators. 
  • Gifting aged stock to loyal customers.
  • Repositioning aging inventory for a new target audience. 
  • Hosting a flash sale to capitalize on the fear of missing out (FOMO).

Avoid aged inventory altogether with Cogsy

Even better than getting rid of aged inventory? Not overstocking on slow-moving SKUs in the first place. Admittedly, this is a bit of a challenge for retail brands. But luckily, Cogsy can help!

Cogsy is an ops optimization tool that empowers you to operate smarter and unlock revenue growth. How so? By your static inventory data into: 

  • Accurate demand forecasts using real-time inventory levels and past trends, so you don't get stuck with slow-moving SKUs. 
  • Sustainable operational plans to hit your most audacious revenue goals (with the power to effortlessly pivot when demand shifts). 
  • Optimized POs with automatic replenishment alerts, so you can operate leaner without stocking out. 
  • A single source of inventory truth, so you know which products are moving (and which ones are aging) and can take action. 

Request a free demo to see 1st-hand how Cogsy prevents your brand from aging inventory.

Aged inventory FAQs

Get answers to the most common aging inventory questions.

What is inventory aging analysis?

An inventory aging analysis calculates how long inventory sits unsold in your warehouse. Brands can use this analysis to identify slower-moving SKUs, then implement strategies to increase inventory turnover and prevent those items from turning into costly dead stock.

Why is aged inventory bad?

Aged inventory is bad because the longer it sits, the more costly holding it becomes. These carrying costs shrink the product's margins and, if aged long enough, can make the item unprofitable when it finally sells. Not to mention that the longer an item sits unsold, the more likely it is to turn into obsolete inventory. 

How to reduce aging inventory?

Retail brands can reduce aging inventory by discounting the SKU, bundling the product with bestsellers, or (if all else fails) donating the excess inventory to charity. But the better operational strategy is to avoid aged stock in the first place by performing regular inventory audits, investigating changes in demand, and improving their demand forecasts.

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