Inventory Tax: How It Works, Which States Tax It, and How to Reduce It

Inventory tax is a property tax levied on the value of your unsold goods, and it applies in the state where your inventory is physically stored — not necessarily where your business is registered.

To stay compliant, you'll need to identify whether your state imposes this tax, choose the right inventory valuation method, and manage your stock levels strategically.

Here's a step-by-step guide to understanding and handling inventory tax for your eCommerce business.

Whether your business operates entirely online or through physical storefronts, understanding how inventory tax works can save you from unexpected liabilities. Let's break it down.

What is inventory tax?

Inventory tax is a financial obligation imposed on a business's unsold inventory at the end of a fiscal year. Just as taxes are levied on a company's furniture, tools, and equipment, inventory tax must be paid regardless of the profit margins recorded that year.

This tax can pose a significant burden to businesses facing hardships — particularly those whose inventory has been affected by shifts in consumer behavior during events like a pandemic. An inventory tax can inflate operating costs even when sales are down.

Inventory extends beyond your final products ready for sale. Any raw materials you import or components you gather for assembly are also considered part of your inventory. If you're a manufacturer tracking raw materials alongside finished goods, both count toward your taxable inventory value.

The value of your inventory determines the tax you owe. The Internal Revenue Service (IRS) recognizes three distinct methods for inventory valuation:

Cost-based approach: The most straightforward method. Your inventory value equals the purchase price plus any transportation and handling costs. This works well for essential items with no hidden charges. Unsaleable stock doesn't count toward your inventory assets — any losses from unsold items show up as higher COGS (Cost of Goods Sold) in your financial statements.

Retail valuation: This method values inventory based on your profit margin. You multiply your average markup percentage by your on-hand inventory. Markups are then deducted to arrive at cost. This method works best when your markup percentage stays consistent.

Lower cost or market valuation: You compare the cost of your inventory to its current market value on a specific date, then record it at whichever is lower. If market value has dropped below your original cost, you reduce your inventory valuation accordingly.

The most suitable method for your business depends on the nature of your operations. Companies with smaller, less varied inventories might find the cost-based calculation more straightforward. The latter two methods offer greater flexibility when dealing with fluctuating prices.

Your inventory's value — and your tax obligation — is also influenced by how well you manage your stock. Economic factors like inflation can impact your inventory's valuation as well.

How does inventory affect taxes?

Inventory affects your taxes in two major ways: it determines your Cost of Goods Sold (COGS), and it establishes the assessed value of your tangible business property.

First, your ending inventory directly impacts COGS. The formula is simple:

Beginning Inventory + Purchases − Ending Inventory = COGS

A higher ending inventory means lower COGS, which means higher taxable income. A lower ending inventory means higher COGS and lower taxable income. This is why your inventory valuation method (FIFO vs. LIFO) matters so much at tax time.

Second, in states that levy inventory tax as a TPP tax, the assessed value of your unsold goods at year-end becomes a separate tax liability. This is on top of any federal income tax implications.

For eCommerce businesses that hold inventory across multiple locations — fulfillment centers, 3PLs, or Amazon FBA warehouses — this can create tax obligations in several states simultaneously. Your inventory management system needs to track not just quantities, but where each unit is stored.

LIFO vs. FIFO: How valuation methods change your tax bill

Two fundamental methods drive inventory valuation: FIFO (First In, First Out) and LIFO (Last In, First Out). These aren't just accounting terms — they directly influence how much inventory tax you owe.

Inventory valuation follows a straightforward formula:

Beginning Inventory + Net Purchases − COGS = Ending Inventory

Let's walk through an example using a hypothetical company, ABC Articles, with simplified numbers.

How LIFO works

With LIFO, you sell the most recently acquired items first. This means your COGS is based on newer, typically higher-cost inventory. Your ending inventory reflects older, lower-cost stock.

The result: lower net income and a lower ending inventory valuation. At first glance, that doesn't sound appealing. But a lower net income could place your business in a lower tax bracket, reducing your overall tax liability.

For example, imagine you purchased inventory across three batches:

• 6 items at $5 each
• 5 items at $7 each
• 8 items at $7 each

If you sold 13 items using LIFO, those 13 would be valued at the most recent prices ($7). Your remaining 6 items would be valued at the older, lower price:

4 items × $5 + 2 items × $7 = $34 ending inventory

The tax on a $34 ending inventory is lower — but in the long run, you may end up with old stock that's harder to sell.

How FIFO works

Most businesses use FIFO for inventory management. You sell the oldest items first, which reduces the risk of holding outdated or expired stock.

With FIFO, COGS is based on older, typically lower-cost inventory. Net earnings are usually higher, but so is your tax liability.

Using the same data, the 13 items sold under FIFO would be those purchased at the lower rate first. Your remaining inventory:

6 items × $7 = $42 ending inventory

A higher ending inventory valuation means a higher tax obligation. However, your business is less likely to deal with unsold products sitting on shelves or selling below their purchase price.

Each method has trade-offs. The way you run your business — including inventory management — should consider more than just the tax implications. While it's useful to understand how inventory affects taxes, it shouldn't dictate your entire business strategy.

The best approach is to adopt sound inventory practices, invest in efficient management systems, and offer products that customers keep coming back for.

Want real-time visibility into every SKU? See how Brahmin tracks inventory across all your channels →

Do you pay taxes on inventory at the end of the year?

Yes — if your inventory is stored in a state that classifies it as taxable tangible personal property. The tax is assessed on the value of unsold inventory you hold on the last day of the fiscal year (or a specific assessment date set by the state).

This catches many eCommerce merchants off guard. You might have slow-moving stock that didn't sell all year, and you still owe tax on its assessed value come December 31.

That's why many merchants try to deplete inventory before the assessment date. However, running your stock too low creates its own problems — stockouts, backorders, and unhappy customers. A better approach is to maintain accurate inventory counts year-round so your year-end valuation reflects reality, not guesswork.

If you use software that tracks inventory turnover and flags slow-moving items, you can make informed decisions about liquidation or write-offs before the tax deadline hits.

Is inventory taxable? Understanding your state's rules

Whether you need to pay inventory tax depends entirely on your state's laws. Not all states view inventory as a taxable component of a business's property.

For inventory to be taxed, the state must classify it as tangible personal property. This places it under the Business Tangible Personal Property (TPP) Tax umbrella, which also covers:

• Office furniture
• Industrial machinery
• Computer systems and peripherals
• Communication devices
• Operational tools
• Office stationery and supplies

Inventory tax by state

Here are the US states that monitor or impose inventory tax in some form:

If you maintain inventory in any of these states, consult a tax professional to understand exactly how they compute inventory tax. States don't provide an automatic calculator for this. As a business owner, you're accountable for tracking your inventory, determining its value, and calculating the tax due.

Compliance with local tax laws is just as crucial as compliance at the federal level.

Inventory tax for eCommerce businesses

If your online store sells tangible goods, you likely have an inventory system for order fulfillment and distribution. How you manage inventory, storage, and distribution directly influences your tax obligations.

Tax planning for an eCommerce business can be especially challenging because many such businesses lack a single physical location. If you're running your eCommerce business from a home office, you might already incorporate storage costs into your overall business expenditures.

Here's the critical detail: inventory tax is levied based on the state where your inventory is stored, _not_ where your business is officially registered.

Being registered in a state without inventory tax doesn't automatically exempt you. Consider these scenarios:

Your company is registered in Ohio (no inventory tax), but your distribution runs through a contract warehouse in Maryland (inventory tax state), because of the Port of Baltimore's proximity.

Your business is registered in Florida (no inventory tax), but your 3PL stores items in warehouses across multiple states — some of which impose inventory tax.

Your business is registered in Texas (inventory tax state), and you use Amazon's FBA program. If merchandise is routed through an Amazon fulfillment center in another inventory-tax state, you may owe tax there too.

These examples show why inventory tax calculations get complicated fast. Your choices about order fulfillment and inventory storage locations can significantly change your tax bill.

Other factors that may influence your inventory tax:

• The duration of inventory storage in a given state
• The end destination of goods after storage
• Whether you use a 3PL or third-party warehouse provider

Dropshipping arrangements (which may or may not create a tax nexus)

Given the ongoing evolution of tax regulations around eCommerce and the varying treatment of inventory as TPP across states, professional assistance is worth the investment.

Strategies to reduce inventory tax for eCommerce merchants

Just as you would with any other expense, consider inventory tax in the broader context of your contribution margin and total manufacturing cost. While reducing tax liability matters, your choices can ripple across your entire operation.

1. Store inventory in non-taxing states

At first glance, this seems obvious. But the location of your stock has a direct bearing on service levels. To meet customer expectations for 1- to 2-day shipping without hiking fulfillment costs, you need inventory close to your end customers.

Before relocating inventory, think about the impact on revenue. Fast and free delivery is a powerful sales driver — 69% of shoppers are more likely to click on ads offering free, 2-day shipping. Moving inventory to a tax-free state could slow your delivery speed and hurt conversions.

2. Deplete inventory before the tax assessment date

As tax season approaches, many merchants trim inventory to shrink their tax bill. However, carrying insufficient inventory leads to expensive stockouts and backorders — potentially disappointing new customers and eroding loyalty.

A smarter approach: use demand forecasting to time your purchasing so inventory naturally dips near the assessment date without going dangerously low.

3. Avoid overstocking

Excessive inventory drains your bottom line through increased storage costs, tied-up capital, and inflated inventory taxes. By assessing your risk tolerance and using reorder points and safety stock, you can strike the right balance between meeting demand and keeping stock levels manageable.

4. Liquidate slow-moving or obsolete inventory

If your inventory turnover rate is less than once per quarter, long-term storage costs may outweigh the profit from an eventual sale. It might be more beneficial to liquidate surplus inventory or donate it for a tax write-off instead of paying inventory tax on it at year-end.

What is the difference between inventory tax and sales tax?

Inventory tax is a liability on unsold items at the end of the tax year. It's calculated based on the original cost of the product, not its selling price. The percentage of inventory value owed as tax is determined by each state that imposes it.

Sales tax is a fee paid by the customer when they purchase taxable items. While the retailer adds this tax to the item's price, it doesn't contribute to your business profits. The collected sales tax must be remitted to the respective state.

The amount of sales tax added to an item depends on the purchaser's location. For instance, in Alabama, consumers pay general sales tax on groceries, while in Florida, they don't. You can find similar variations across all fifty states.

Since eCommerce businesses are now required to pay state sales taxes, it's crucial to have strong systems in place to manage transactions across multiple states. The criteria states use to enforce sales tax collection from online retailers vary. Additionally, the type of eCommerce business you operate may impact your eligibility for sales tax exemptions — tax laws can differ between B2B and B2C sellers.

Sales tax nexus for eCommerce merchants

For online retailers, understanding sales tax nexus is critical. This term signifies a "significant connection" between a company and a particular state, which enables the state to mandate sales tax collection from that company.

What constitutes a "significant connection"? The answer varies from state to state, creating a complex web for eCommerce businesses striving to stay compliant.

Following the South Dakota v. Wayfair verdict, all states have the authority to demand sales tax from online retailers. However, enforcement levels differ. California, for instance, is known for rigorous enforcement of state sales taxes.

Potential indicators of a tax nexus:

• Physical location: An office, store, or warehouse within the state
• Paid personnel: Employees or contract workers residing in the state

Inventory holding: Even if the state doesn't impose inventory tax, the physical presence of inventory might create a nexus requiring sales tax collection

Advertising affiliates: Any person or entity earning a profit from promoting your business

Trade show participation: Selling items at a trade show, even briefly, could establish a nexus

Dropshipping partners: They could be considered as agents of your business, especially if they operate within the state

These are not exhaustive guidelines. They may or may not apply in your specific states. As your business reaches more states, keeping current with changing tax laws becomes essential.

Understanding inventory write-offs

In many jurisdictions, businesses can claim a tax deduction for inventory that has been damaged or become obsolete. If you have merchandise that was meant for sale but has lost all its value and is unsellable, you can record it as an inventory write-off. Your assessable income includes the final value of your inventory after making allowable deductions.

As the financial year draws to a close, review your stock to identify slow-moving or obsolete items. This helps you decide whether they should be written off for that tax year. Different valuation methods may result in greater reductions in your taxable income.

Here's the write-off process in three steps:

Review your inventory reports to identify slow-moving or obsolete items.

Decide on write-offs before the financial year closes so you can claim the deduction for the current year.

Write off damaged inventory promptly during the year. This keeps your current inventory valuation accurate and provides an immediate tax deduction.

Unsold inventory isn't automatically tax-deductible. Tax deductions apply only to inventory you've sold, or to inventory with a lower market value than when initially purchased. You can claim a deduction on stock that has a reduced valuation, is obsolete, was subject to theft, or qualifies as a write-off.

Unsold inventory can decrease your taxable income through its impact on profits. But it also means you have capital tied up in stock that isn't providing any return.

Implementing inventory controls

Inventory represents a merchant's most significant asset and capital investment. Tracking inventory accurately enhances many facets of your business — from demand forecasting and stockout prevention to shrinkage reduction and inventory tax calculation.

The more precisely you know what you have, where it's stored, and how fast it moves, the more accurate your year-end tax obligations become. Manual tracking methods — spreadsheets, for example — tend to break down as your business grows across multiple locations or fulfillment partners.

That's where purpose-built inventory software makes a difference. Automated tracking gives you real-time visibility into stock levels across every location, so you're never guessing at year-end valuations.

How Brahmin Solutions can help

Brahmin Solutions is a cloud-based manufacturing platform for growing manufacturers doing $500K–$50M in revenue. It handles inventory management, MRP, production planning, and lot tracking in one system — giving you the real-time inventory accuracy you need for confident tax reporting. If that sounds like what you need, book a demo and see how it fits your operation.

Sources

• Taxfoundation
• Amraandelma
• Mediapost
• Taxpolicycenter
• Handsoffsalestax
• Irs
• Bigcommerce

Frequently asked questions

How is inventory taxed when selling a business?

When you sell a business, inventory is typically taxed separately from other assets. The buyer and seller must agree on the inventory's fair market value, and the sale of inventory is generally treated as ordinary income for the seller — not capital gains. The exact tax treatment depends on your state and how the purchase agreement allocates the sale price across assets.

How to avoid inventory tax?

You can't avoid inventory tax entirely if your stock is stored in a state that imposes it. However, you can reduce your liability by storing inventory in non-taxing states, depleting stock before assessment dates, liquidating slow-moving items, and keeping accurate inventory records so you don't overstate your valuation. Consult a tax professional for strategies specific to your situation.

Can you write off inventory and still sell it?

No. You can only write off inventory that is genuinely unsellable — damaged, obsolete, or stolen. If you write off inventory and later sell it, you'd need to report that income. The IRS requires that write-offs reflect actual loss of value, not a temporary markdown strategy.

How to manage inventory for eCommerce tax purposes?

Start by choosing a consistent valuation method (FIFO or LIFO), tracking inventory by location, and conducting regular cycle counts. Use inventory management software that records quantities and costs in real time across all your storage locations — including 3PL warehouses and fulfillment centers. Accurate records make year-end tax calculations straightforward and defensible in an audit.

How Brahmin Solutions can help

Accurate inventory valuation is the foundation of correct tax reporting — and the hardest part is keeping valuations current when costs change with every purchase. Brahmin tracks inventory value in real time using the weighted average cost method, recalculating your per-unit cost automatically every time you receive new stock. That means your ending inventory value is always current, not based on a quarterly spreadsheet snapshot.

Every item in the system carries its current valuation, quantity on hand, and cost history, so when tax season arrives you can pull an inventory valuation report that matches what you actually have — not what you thought you had three months ago. If inventory valuation is eating up hours of manual work at year-end, book a demo and see how real-time tracking simplifies your tax reporting.