A container of inventory lands at PortMiami, and the invoice from your freight forwarder shows three line items you were not expecting: ocean freight, a customs duty assessment, and a tariff surcharge tied to the product's country of origin. Where do those dollars go on your books? If you answered "operating expense," you are costing yourself tax deductions, distorting your gross margin, and possibly misstating inventory value on every financial statement you generate for the rest of the year. Landed cost, the total cost of getting a unit of inventory to a sellable, usable state, is one of the most commonly mishandled accounting concepts among importers, and getting it wrong has real consequences at tax time.

For South Florida business owners who import goods through PortMiami or Port Everglades, this is not an abstract accounting exercise. Miami-Dade County's position as a gateway for trade with Latin America, the Caribbean, and increasingly Asia means a large share of our clients at WAYG's Coral Gables headquarters are wrestling with freight allocation, duty drawback, and tariff classification every single quarter. This article walks through exactly where each landed cost component belongs, how it affects your cost of goods sold, and what the 2025 tax law changes mean for importers heading into the 2026 filing season.

What Is Landed Cost and Why It Matters for Inventory Costing

Landed cost is the total expense of acquiring inventory and delivering it to the location where it becomes available for sale. It includes the purchase price of the goods plus every cost incurred to get that inventory ready and in place, not just the invoice from your overseas supplier.

Under IRC Section 471 and the Uniform Capitalization rules in Section 263A, businesses that produce or acquire property for resale must capitalize certain indirect costs into inventory rather than expensing them immediately. For importers, this means freight-in, customs duties, tariffs, insurance on the shipment, and brokerage fees generally belong in inventory costing, not on the income statement as a period expense.

Here is the core landed cost formula:

Landed Cost per Unit = (Product Cost + Freight-In + Duties and Tariffs + Insurance + Broker Fees + Other Acquisition Costs) ÷ Total Units Received

Get this calculation wrong and two things happen. First, your cost of goods sold understates the true cost of each sale, inflating gross margin on paper while your bank account tells a different story. Second, you risk an IRS adjustment during an audit, since Section 263A capitalization is a frequent target for examiners reviewing importers and wholesalers.

Freight Costs: Inbound vs. Outbound Treatment

Not all freight is treated the same way, and this is where a lot of South Florida ecommerce sellers trip up.

Freight-In Belongs in Inventory

Freight-in, the cost of shipping goods from your supplier to your warehouse or fulfillment center, is a direct cost of acquiring inventory. It gets capitalized into the cost of the goods and only hits your income statement as COGS when the inventory sells.

Freight-Out Is a Selling Expense

Freight-out, the cost of shipping a finished sale to your customer, is treated differently. This is a period expense, deducted in the year incurred, typically classified under selling expenses rather than COGS or inventory.

Example: A Coral Gables based home goods importer brings in a container of ceramic planters costing $40,000 from the supplier, plus $6,500 in ocean freight to PortMiami. That $6,500 is freight-in and gets added to the $40,000 product cost, creating a total landed inventory cost of $46,500 before duties. When those planters later ship to customers nationwide via UPS at a cost of $3,200 for the month, that $3,200 is freight-out, deducted immediately as a selling expense.

Import Duties and Tariffs: Capitalize, Do Not Expense

This is the single most common error we see at our Coral Gables headquarters when reviewing new client books. Business owners record customs duty payments and tariff charges as a line item called "duties expense" or lump them into "cost of goods sold" without tying them to specific inventory units. Both approaches create problems.

Duties and tariffs are direct acquisition costs under Section 263A and must be capitalized into inventory, then expensed through COGS only as those specific units sell. If you import inventory in September 2026 and pay a 15% tariff, and half of that inventory is still sitting in your warehouse on December 31, 2026, half of that tariff cost should still be sitting on your balance sheet as inventory, not your income statement as an expense.

Example with 2026 tariff rates: Suppose a Miami-area electronics importer brings in 1,000 units of a product. The per-unit cost is $85, totaling $85,000. A tariff rate of 20% applies based on country of origin, adding $17,000. Freight and insurance add another $4,000. Total landed cost is $106,000, or $106.00 per unit.

If the business sells 600 units by year end, COGS for those units is 600 x $106.00 = $63,600. The remaining 400 units, valued at $42,400, stay on the balance sheet as ending inventory. A business that instead expensed the full $17,000 tariff immediately would understate net income by overstating that period's expenses, then face a correction in a later period, a timing issue the IRS cares about deeply during audits.

Duty Drawback Programs

If you import goods, pay duties, and later export the same or similar merchandise, you may qualify for duty drawback, a refund of up to 99% of duties paid. This is particularly relevant for South Florida companies re-exporting to Latin America and the Caribbean through PortMiami. Drawback claims require meticulous recordkeeping tying specific import entries to specific export transactions, which is exactly the kind of detail work handled well through managed accounting support.

Landed Cost Allocation Table: Where Each Item Belongs

Allocating Landed Cost Across Multiple SKUs

Most containers do not arrive carrying a single product. If you import a mixed container with five different SKUs, you need a consistent, defensible method to spread freight, duties, and tariffs across each product line.

The two most common allocation methods are:

1. Value based allocation: Spread shared costs proportionally based on each SKU's share of total invoice value. A SKU representing 30% of the invoice value absorbs 30% of the shared freight and duty costs.
2. Weight or volume based allocation: Spread shared costs based on each SKU's share of total shipping weight or cubic volume, often more accurate when tariff rates or freight charges are driven by weight rather than value.

Example: A container holds three products with the following invoice values: Product A at $20,000, Product B at $15,000, Product C at $5,000, for a total of $40,000. Shared freight and duty costs total $8,000. Using value based allocation, Product A absorbs 50% of $8,000 ($4,000), Product B absorbs 37.5% ($3,000), and Product C absorbs 12.5% ($1,000). This method keeps gross margin reporting accurate at the SKU level, which matters enormously if you are making pricing or discontinuation decisions.

Allocation Method Comparison

Why This Matters More Under Current Tariff Policy

Tariff rates on goods from several major trading partners have shifted meaningfully over the past two years, and 2026 continues to bring adjustments tied to ongoing trade negotiations. For importers, this means landed cost calculations cannot be "set and forget." A rate that applied to your August 2025 shipment may not apply to your October 2026 shipment of the identical product.

This is also where provisions from the 2025 tax legislation often called the "Big Beautiful Bill" intersect with inventory accounting. While that legislation primarily reshaped depreciation rules, including enhanced bonus depreciation for certain capital assets, it did not change the fundamental Section 263A capitalization requirements for inventory. Importers sometimes assume new tax law gives them flexibility to expense duties and tariffs immediately. It does not. The capitalization requirement remains a separate, unchanged rule, and conflating the two is a mistake we actively correct for clients each filing season.

Steps to Fix Your Landed Cost Accounting Today

1. Pull your last three import entries and identify whether duties and tariffs were expensed or capitalized.
2. Separate freight-in from freight-out in your chart of accounts if they are currently combined.
3. Choose an allocation method (value, weight, or unit based) and apply it consistently across all mixed-SKU shipments.
4. Update your per-unit landed cost in your inventory system every time duty rates or freight rates change materially.
5. Reconcile landed cost inventory value against your general ledger inventory balance at least quarterly.
6. Consider duty drawback eligibility if you export any portion of imported goods.
7. Work with a tax professional familiar with Section 263A before your 2026 return is filed, since retroactive corrections get significantly harder after year end.

If your bookkeeping team is currently expensing duties as they are paid rather than tying them to specific inventory lots, this is a fixable problem, but it requires both a process change and likely a correction to prior period inventory values. Our small business bookkeeping team at WAYG routinely rebuilds landed cost schedules for importers who discover this issue mid-year.

Common Mistakes South Florida Importers Make

Miami-area entrepreneurs importing from Asia, Latin America, and Europe tend to repeat a handful of specific errors:

• Recording the customs broker's invoice as a lump "import fees" expense instead of splitting duty, tariff, and brokerage components into inventory.
• Failing to true up landed cost per unit when a new shipment arrives at a different freight or tariff rate, leaving older, cheaper units blended with newer, costlier units under an inaccurate average.
• Ignoring marine cargo insurance as a capitalizable cost, expensing it instead.
• Not tracking landed cost by SKU, making it impossible to know which products are actually profitable once true delivered cost is factored in.

Each of these errors compounds over a fiscal year, and by the time a tax preparer sees the books in February or March, correcting them retroactively is far more expensive than building the process correctly from the start. This is precisely the kind of forward-looking planning covered under business tax strategy engagements, where landed cost methodology gets reviewed before it becomes a filing season surprise.

Frequently Asked Questions

Q: Do I have to capitalize freight and duties even if my business is small? A: Generally yes. Section 263A has a small business exception for taxpayers with average annual gross receipts under a specific threshold (adjusted annually for inflation), but many importers, especially growing ecommerce businesses, exceed that threshold faster than expected. Even if you qualify for the exception, capitalizing landed costs properly almost always produces more accurate financial statements and better pricing decisions.

Q: What happens if I have already been expensing duties and tariffs incorrectly? A: You will likely need to file Form 3115 to request a change in accounting method and adjust prior period inventory values through a Section 481(a) adjustment. This is a technical filing that should be handled with a tax professional rather than attempted as a simple journal entry correction.

Q: How does landed cost affect my cost of goods sold on my tax return? A: Landed cost determines the per-unit value of inventory, which flows into COGS only when that inventory actually sells. Overstating or understating landed cost directly overstates or understates your taxable income for the period, which is why the IRS scrutinizes inventory costing methods during audits of importers.

Q: Are there special considerations for South Florida businesses importing through PortMiami? A: South Florida importers often deal with high shipment frequency from Latin America and the Caribbean, which means landed cost rates can change shipment to shipment based on country of origin tariffs and fluctuating freight rates. Businesses in Miami-Dade County benefit from setting up a landed cost template that updates per shipment rather than relying on a single annual average.

Q: Can I use an average landed cost across all my inventory, or does it need to be tracked by SKU? A: Tracking by SKU is strongly recommended, especially for mixed container shipments, because a single blended average can hide the fact that one product line is far less profitable than another once true delivered costs are included. Most modern inventory management systems support SKU level landed cost tracking, and pairing that system with proper accounting support makes the data usable at tax time.

Q: Does duty drawback apply to ecommerce businesses that only sell domestically? A: No, duty drawback specifically requires that imported goods, or substitute merchandise, are subsequently exported. If your South Florida business sells exclusively within the United States, drawback will not apply, but it is worth revisiting if you expand into Latin American or Caribbean export markets given the logistics advantages of operating near PortMiami.

Getting landed cost accounting right is not a one-time fix, it is an ongoing discipline that protects your margins, your inventory valuation, and your tax position every time a new shipment clears customs. If your current process lumps freight, duties, and tariffs into vague expense categories, your 2026 tax return is likely carrying errors that will only get harder to unwind as volume grows. The team at WAYG's Coral Gables headquarters works with importers across Miami-Dade County to build landed cost systems that hold up under IRS scrutiny and give you real visibility into which products actually make money. Schedule a consultation today to review your landed cost methodology before year end, or explore our virtual CPA services for ongoing support as your import volume grows.