How are customs duties and tariffs treated for federal income tax purposes?

Customs duties and tariffs paid to US Customs and Border Protection (CBP) are generally part of the cost of imported goods and must be capitalized into inventory under the uniform capitalization rules of IRC Section 263A. This means duties are not immediately deductible — they are included in the cost of the imported goods and deducted as cost of goods sold when the inventory is sold. Section 301 tariffs on Chinese goods, Section 232 tariffs on steel and aluminum, and antidumping/countervailing duties follow the same treatment. If duties are refunded through a drawback (for goods that are re-exported or used in exported products), the refund is taxable income in the year received.

What is an IC-DISC and how does it help exporters?

An IC-DISC (Interest Charge Domestic International Sales Corporation) is a US tax incentive for exporters. You set up a domestic corporation (the IC-DISC) that receives a commission from your operating business on export sales. The operating company deducts the commission as an ordinary business expense (up to 23.8% tax value for pass-through entities), and the IC-DISC pays a tax-free commission to its shareholders — who then receive a qualified dividend taxed at the preferential 20% rate (plus 3.8% NIIT if applicable). The net savings for a US exporter in the highest bracket can be 17–18 cents per dollar of export income shifted through the IC-DISC. There is no minimum export volume requirement, and many small exporters overlook this incentive entirely.

How do I handle foreign currency gains and losses?

Foreign currency transactions are governed by IRC Section 988. When you receive payment in a foreign currency (Korean Won, Chinese Yuan, Euro), the exchange gain or loss is ordinary income or loss — not capital gain — calculated at the spot rate on the transaction date. If you hold foreign currency and its value changes before you convert it to dollars, that also creates a Section 988 gain or loss. Some businesses elect out of Section 988 treatment on forward contracts and options (treating them as capital gain/loss under Section 1256), but this requires a contemporaneous election and careful documentation. Functional currency election for foreign branches or QBUs (Qualified Business Units) adds another layer to the analysis.

What records do I need to keep for imported goods?

CBP requires importers to keep all entry records for 5 years from the date of entry. For tax purposes, you must also maintain records supporting the cost basis of your imported inventory — commercial invoices, packing lists, bills of lading, CBP entry forms (7501), duty payment receipts, and any freight and insurance invoices. These records are essential for calculating accurate COGS, supporting any Section 263A uniform capitalization adjustments, and responding to CBP audits (called Focused Assessment) that can go back 5 years. If you claimed any preferential duty rates under trade agreements (KORUS FTA with Korea, USMCA with Canada/Mexico), you need documentation proving origin.

Import-Export Business Tax Services

International trade creates tax complexity that most general accountants are not equipped to handle. From the correct treatment of customs duties in inventory valuation to foreign currency gains, transfer pricing documentation, and export incentives like the IC-DISC, businesses engaged in cross-border trade need a CPA who understands the intersection of US tax law and international commerce. Myung Keon Kim CPA works with Korean-American importers, US exporters trading with Asia, and businesses navigating the complex trade environment of New York's port and logistics ecosystem.

Customs Duties and Tariffs — Tax Treatment

Customs duties are not immediately deductible as a business expense. Under the uniform capitalization rules of IRC Section 263A, importers are required to capitalize into inventory all costs that are allocable to goods purchased for resale — including customs duties, freight, insurance, and customs broker fees. These capitalized costs flow through to cost of goods sold as the inventory is sold. For businesses that turn over inventory quickly, the tax effect is similar to immediate expensing. For businesses with slow-moving or seasonal inventory, UNICAP means you are effectively deferring the deduction until the goods are sold.

HTS (Harmonized Tariff Schedule) classification determines the duty rate applicable to your goods. Misclassification is a significant compliance risk — CBP can assess back duties, interest, and penalties going back 5 years, and in cases of intentional misclassification, criminal penalties can apply. We work with customs brokers to ensure your HTS codes are defensible and consistent.

Foreign Currency Transactions — IRC Section 988

If your business invoices customers or pays suppliers in foreign currency, every transaction creates a potential tax event. When you bill a Korean supplier for USD and they pay in Won, or when you sell goods to a buyer who pays in Euros, the exchange rate between the transaction date and the settlement date creates a foreign currency gain or loss. Under Section 988, these gains and losses are ordinary income or loss — they do not receive capital gain treatment.

Businesses with significant foreign currency exposure should consider hedging strategies. Forward contracts, options, and futures on foreign currencies can lock in exchange rates and reduce earnings volatility. The tax treatment of hedging transactions depends on whether the hedge qualifies as an "integrated hedging transaction" or a "business hedge" under Section 988 regulations — improper characterization can create timing mismatches between when the hedging gain/loss is recognized and when the underlying business loss/gain is recognized.

Transfer Pricing

If you buy from or sell to related parties in other countries — a Korean parent company, a Hong Kong trading subsidiary, a Chinese manufacturing affiliate — IRC Section 482 requires that transactions be priced as if they were between unrelated parties (the arm's length standard). Transactions that do not meet this standard can be reallocated by the IRS, resulting in additional US taxable income and penalties up to 40% of the underpayment. Transfer pricing documentation — including a contemporaneous economic analysis supporting your prices — is required for any controlled transaction above $10 million (or for the penalty protection safe harbor, $6 million in a single year or $12 million over 5 years).

IC-DISC — Export Tax Incentive

The Interest Charge Domestic International Sales Corporation is one of the most overlooked tax incentives in US international tax law. If you export US-manufactured or substantially transformed goods, you can establish an IC-DISC — a shell domestic corporation with minimal operating requirements — that earns a commission on your export sales. The commission is deductible by your operating entity at ordinary income rates (up to 37% for individuals, 21% for C-Corps) and is received by the IC-DISC as dividend income. The IC-DISC pays no corporate income tax, and distributions to shareholders are taxed as qualified dividends at the preferential 20% rate (plus 3.8% NIIT for high earners).

The mechanics: your operating business pays the IC-DISC a commission based on export gross receipts or export net income (the rules allow a 4% of gross receipts or 50% of export net income calculation, whichever is more favorable). The IC-DISC must maintain minimal records and file Form 1120-IC-DISC. The shareholders of the IC-DISC (typically the same owners as the operating business) receive distributions taxed at preferential rates. For a business with $2 million in annual export sales, the IC-DISC benefit can reduce effective tax rates by 3–5 percentage points on the commission amount.

VAT Recovery for US Exporters

US businesses selling to customers in the European Union, South Korea, Japan, and most other countries encounter foreign Value Added Tax (VAT). When you exhibit at a foreign trade show, purchase supplies from a foreign vendor, or incur business expenses in a VAT country, you may be charged VAT that is recoverable. US businesses can reclaim foreign VAT paid on business expenses in many countries through the 13th Directive VAT refund process (for EU countries) or equivalent country-specific refund schemes. Recovering VAT requires filing claims with each country's tax authority within the applicable deadline (typically 6–9 months after the end of the calendar year in which expenses were incurred). These refunds do not flow through the US tax return but directly reduce your international operating costs.

Inventory Valuation for Imported Goods

Imported inventory valuation must reflect the full landed cost — purchase price, ocean or air freight, marine insurance, customs duties, customs broker fees, and any port handling charges. Failing to capitalize these costs into inventory understates COGS and overstates taxable income in years when inventory is built up, and creates audit exposure when the IRS compares your COGS to gross sales and finds margins inconsistent with your industry. We help you set up a landed cost tracking system that automatically allocates these costs across inventory lots, ensuring accurate tax reporting and meaningful product-level profitability data.

A tariff is inventory, not an expense

Treas. Reg. §1.471-3(b) adds to the invoice price "transportation or other necessary charges incurred in acquiring possession of the goods," and IRC §263A(a)(2)(B) capitalizes a product's proper share of indirect costs "including taxes." A duty paid at the port does not reduce this year's income. It rides through raw materials, work-in-process and finished goods, and reaches the income statement as cost of goods sold only when that unit is sold. Cash leaves now; the deduction waits. The slower inventory turns, the wider that gap — and recent tariff increases widened it for every importer who builds something.

Your standard cost system probably disagrees with §263A

Most standard-costing setups absorb fixed overhead using practical or normal capacity. Treas. Reg. §1.263A-2(a)(4) prohibits the practical capacity concept for tax outright. Book and tax are then computing different inventory, and that difference has to be found and reconciled rather than assumed away. It is the kind of break that survives years of returns because nobody has looked for it.

Raw materials cost you before you use them

Treas. Reg. §1.263A-2(a)(3)(ii) is explicit: "a manufacturer must capitalize the costs of storing and handling raw materials before the raw materials are committed to production." Pre-production storage and handling is capitalizable, and post-production storage frequently is too. Left sitting in overhead as period expense, inventory is understated and the return is wrong in a way an examiner finds quickly.

There is a small-business exemption from §263A under §263A(i), keyed to the §448(c) gross receipts test. Whether you fall inside or outside it changes the entire analysis, and it is the first thing worth checking.

Frequently Asked Questions

How are customs duties and tariffs treated for federal income tax purposes?: Customs duties and tariffs paid to US Customs and Border Protection (CBP) are generally part of the cost of imported goods and must be capitalized into inventory under the uniform capitalization rules of IRC Section 263A. This means duties are not immediately deductible — they are included in the cost of the imported goods and deducted as cost of goods sold when the inventory is sold. Section 301 tariffs on Chinese goods, Section 232 tariffs on steel and aluminum, and antidumping/countervailing duties follow the same treatment. If duties are refunded through a drawback (for goods that are re-exported or used in exported products), the refund is taxable income in the year received.
What is an IC-DISC and how does it help exporters?: An IC-DISC (Interest Charge Domestic International Sales Corporation) is a US tax incentive for exporters. You set up a domestic corporation (the IC-DISC) that receives a commission from your operating business on export sales. The operating company deducts the commission as an ordinary business expense (up to 23.8% tax value for pass-through entities), and the IC-DISC pays a tax-free commission to its shareholders — who then receive a qualified dividend taxed at the preferential 20% rate (plus 3.8% NIIT if applicable). The net savings for a US exporter in the highest bracket can be 17–18 cents per dollar of export income shifted through the IC-DISC. There is no minimum export volume requirement, and many small exporters overlook this incentive entirely.
How do I handle foreign currency gains and losses?: Foreign currency transactions are governed by IRC Section 988. When you receive payment in a foreign currency (Korean Won, Chinese Yuan, Euro), the exchange gain or loss is ordinary income or loss — not capital gain — calculated at the spot rate on the transaction date. If you hold foreign currency and its value changes before you convert it to dollars, that also creates a Section 988 gain or loss. Some businesses elect out of Section 988 treatment on forward contracts and options (treating them as capital gain/loss under Section 1256), but this requires a contemporaneous election and careful documentation. Functional currency election for foreign branches or QBUs (Qualified Business Units) adds another layer to the analysis.
What records do I need to keep for imported goods?: CBP requires importers to keep all entry records for 5 years from the date of entry. For tax purposes, you must also maintain records supporting the cost basis of your imported inventory — commercial invoices, packing lists, bills of lading, CBP entry forms (7501), duty payment receipts, and any freight and insurance invoices. These records are essential for calculating accurate COGS, supporting any Section 263A uniform capitalization adjustments, and responding to CBP audits (called Focused Assessment) that can go back 5 years. If you claimed any preferential duty rates under trade agreements (KORUS FTA with Korea, USMCA with Canada/Mexico), you need documentation proving origin.