U.S. Corporate Tax 2025: What Turkish Subsidiaries and Investors Need to Know

Turkish companies that establish U.S. subsidiaries or invest in U.S. businesses enter one of the world's most complex tax environments. The U.S. corporate tax system operates at both the federal and state levels, with a web of anti-avoidance rules — GILTI, BEAT, FDII, transfer pricing — designed to ensure that multinational companies pay their fair share of U.S. tax.

This guide provides an overview of the key U.S. corporate tax obligations for Turkish-owned U.S. subsidiaries, the interaction with the Turkey-U.S. Tax Treaty, and the planning opportunities available to minimize U.S. tax exposure.

The U.S. federal corporate income tax rate is a flat 21% on taxable income, enacted by the Tax Cuts and Jobs Act of 2017 (TCJA). This rate applies to all U.S. corporations, including U.S. subsidiaries of Turkish parent companies.

State corporate income taxes: In addition to the federal rate, most U.S. states impose their own corporate income taxes, typically ranging from 3% to 12%. The combined federal and state effective tax rate for a U.S. corporation is typically 25–30%, depending on the state.

Key states for Turkish businesses:

• New York: 6.5% state corporate tax + New York City tax (8.85% for corporations doing business in NYC)
• Delaware: 8.7% state corporate tax (but no sales tax)
• Florida: 5.5% state corporate tax
• Texas: No state corporate income tax (but a franchise tax)
• Nevada/Wyoming: No state corporate income tax

A U.S. subsidiary of a Turkish parent company is a U.S. domestic corporation and is subject to U.S. federal and state corporate income tax on its worldwide income — including income earned outside the United States.

However, the U.S. has a participation exemption (enacted by the TCJA) that allows U.S. corporations to deduct 100% of dividends received from foreign subsidiaries in which they own at least 10%. This means that a U.S. subsidiary of a Turkish parent can generally receive dividends from its own foreign subsidiaries tax-free.

U.S. corporate taxable income is calculated as:

• Gross income (revenue from all sources)
• Less: Deductible business expenses (salaries, rent, depreciation, interest, etc.)
• Less: Net operating loss (NOL) deductions
• Equals: Taxable income

GILTI is a minimum tax on the income of foreign subsidiaries of U.S. corporations. If a Turkish parent company has a U.S. subsidiary, and that U.S. subsidiary has its own foreign subsidiaries, the U.S. subsidiary may be subject to GILTI on the income of those foreign subsidiaries.

GILTI is calculated as the excess of the U.S. shareholder's "net CFC tested income" over a 10% return on the U.S. shareholder's "qualified business asset investment" (QBAI). The effective GILTI rate for U.S. corporations is currently 10.5% (with a 50% deduction), rising to 13.125% after 2025 under current law.

Practical implication: Turkish companies that establish U.S. subsidiaries with their own foreign operations must model the GILTI impact before structuring their U.S. presence.

BEAT is a minimum tax designed to prevent large U.S. corporations from reducing their U.S. tax liability by making deductible payments to foreign related parties. BEAT applies to U.S. corporations with:

• Average annual gross receipts of at least $500 million over the prior 3 years
• A "base erosion percentage" of at least 3%

BEAT is calculated as 10% (rising to 12.5% after 2025) of the corporation's "modified taxable income" — taxable income calculated without deductions for certain payments to foreign related parties.

Practical implication: Large Turkish-owned U.S. subsidiaries that make significant payments to their Turkish parent (royalties, management fees, interest) should model their BEAT exposure.

The IRS requires that transactions between a U.S. subsidiary and its Turkish parent (or other related parties) be conducted at arm's length — i.e., at prices that unrelated parties would charge each other. This applies to:

• Sales of goods between the U.S. subsidiary and the Turkish parent
• Royalties for the use of intellectual property
• Management fees and service charges
• Intercompany loans and interest payments

Documentation requirements: U.S. transfer pricing rules require contemporaneous documentation of the arm's length nature of intercompany transactions. Failure to maintain adequate documentation can result in penalties of 20–40% of the transfer pricing adjustment.

Advance Pricing Agreements (APAs): Turkish companies with significant intercompany transactions can negotiate an APA with the IRS to obtain certainty about the transfer pricing methodology for future years.

The Convention Between the United States of America and the Republic of Turkey for the Avoidance of Double Taxation (the "Treaty") provides important protections for Turkish companies and investors operating in the United States.

Reduced withholding rates:

Permanent establishment: The Treaty defines when a Turkish company has a "permanent establishment" (PE) in the United States — the threshold at which the Turkish company becomes subject to U.S. tax on its U.S.-source business income. Understanding the PE threshold is critical for Turkish companies with U.S. sales representatives, agents, or offices.

Limitation on Benefits (LOB): The Treaty includes a Limitation on Benefits clause that restricts treaty benefits to entities that meet certain ownership and activity tests. Turkish companies should confirm their eligibility for treaty benefits before relying on reduced withholding rates.

A U.S. subsidiary is subject to state corporate income tax in any state where it has nexus — a sufficient connection to the state to justify taxation. Nexus can be established by:

• Physical presence (office, employees, inventory)
• Economic nexus (sales exceeding a threshold — typically $500,000 or 200 transactions)

Turkish companies with U.S. subsidiaries that sell products or services across multiple states must assess their nexus in each state and file state corporate income tax returns accordingly.

Most states apportion a multistate corporation's income based on a formula that considers the corporation's sales, payroll, and property in the state relative to its total sales, payroll, and property. Many states have moved to a single sales factor apportionment formula, which apportions income based solely on the ratio of in-state sales to total sales.

1. Model your effective tax rate before investing: Before establishing a U.S. subsidiary, model the combined federal and state effective tax rate, including GILTI and BEAT exposure.

2. Establish transfer pricing documentation from day one: Do not wait until an IRS audit to document your intercompany pricing. Contemporaneous documentation is required and reduces penalty exposure.

3. Claim treaty benefits proactively: Ensure that withholding agents are aware of your treaty benefits and are applying the correct reduced withholding rates.

4. Assess state nexus: Identify all states where your U.S. subsidiary has nexus and ensure state tax returns are filed.

5. Engage a Big Four or national accounting firm: U.S. corporate tax compliance for Turkish-owned subsidiaries requires specialized expertise. Engage a firm with experience in U.S.-Turkey cross-border tax matters.

The U.S. corporate tax system is complex, but with proper planning, Turkish companies can structure their U.S. presence to minimize tax exposure while remaining fully compliant. The Turkey-U.S. Tax Treaty provides important protections, but claiming treaty benefits requires careful structuring and documentation.

ULF New York works with Turkish clients and their tax advisors to structure U.S. investments, ensure treaty compliance, and navigate the U.S. corporate tax landscape. Contact us to discuss your U.S. tax planning needs.

This article is for informational purposes only and does not constitute tax advice. U.S. tax law is complex and subject to change; consult qualified U.S. tax counsel for advice specific to your situation.