International Tax Services for US Small Business Owners Abroad

US small business owners with international operations — or entrepreneurs who have moved abroad while continuing to run American businesses — face a uniquely challenging intersection of domestic business taxation and international tax compliance. Whether you run an e-commerce store from Lisbon, operate a consulting firm from Toronto, or manage a US-based LLC while living in Bangkok, the tax implications are vastly more complex than a simple domestic filing. Entity Structure for Expat Business Owners: LLC vs S-Corp vs C-Corp The choice of business entity has enormous tax consequences for US business owners abroad. A single-member LLC is a disregarded entity for US tax purposes — all income flows through to your personal Form 1040 on Schedule C. This simplicity comes at a cost: you owe self-employment tax of 15.3% on net business income (12.4% Social Security on the first $176,100 of combined wages and SE income in 2026, plus 2.9% Medicare with no cap, plus 0.9% Additional Medicare Tax on earnings above $200,000 for single filers). The Foreign Earned Income Exclusion can eliminate your income tax, but it does nothing to reduce self-employment tax. A business owner abroad earning $120,000 in net profit still owes approximately $16,950 in SE tax even if FEIE wipes out the income tax entirely. The S-Corporation election can dramatically reduce SE tax. By forming an LLC and electing S-Corp status (Form 2553), you pay yourself a 'reasonable salary' (say $60,000) and take the remaining profit ($60,000) as distributions. Only the salary is subject to payroll taxes (7.65% employer + 7.65% employee = 15.3%). The distribution is not subject to SE tax, saving roughly $9,180 on $60,000. However, the 'reasonable salary' requirement is strictly enforced by the IRS — setting it too low invites audit. For expat S-Corp owners, additional complications include running payroll for yourself from abroad, ensuring proper W-2 issuance, and managing quarterly payroll tax deposits. S-Corps also cannot have nonresident alien shareholders, which matters if you are considering adding a foreign business partner. C-Corporation status may be advantageous for high-earning business owners because the flat 21% corporate tax rate is below the top individual rate of 37%. Profits can be retained in the corporation rather than distributed, deferring individual tax. However, C-Corps create double taxation when profits are distributed as dividends — the corporation pays 21% and the shareholder pays up to 23.8% (20% qualified dividend rate + 3.8% Net Investment Income Tax). For expats, this double-taxation issue is compounded by the fact that the foreign country may also tax the dividend income, and the interaction between the US corporate tax, the US dividend tax, and the foreign personal tax requires careful treaty analysis. Self-Employment Tax for Business Owners Abroad: The 15.3% Burden Self-employment tax is the most common surprise for US business owners living abroad. The FEIE eliminates income tax but not SE tax. The SE tax calculation works as follows: net SE income × 92.35% (the self-employment tax base) × 15.3% = SE tax. On $100,000 net income, that is $100,000 × 0.9235 × 0.153 = $14,130. This is owed even if you live in a country with 0% income tax. Totalization agreements with about 30 countries (including Canada, UK, Germany, France, Australia, Japan, and South Korea) can exempt you from US SE tax if you are contributing to the foreign country's social security system. Without an agreement (e.g., Thailand, UAE, most of Southeast Asia), you owe US SE tax regardless of any foreign social security contributions. To claim the exemption, you must obtain a Certificate of Coverage from the foreign country's social security authority. Form 5471: The Most Complex IRS Form If you, as a US person, own 10% or more of a foreign corporation (known as a Controlled Foreign Corporation or CFC), you must file Form 5471, Information Return of U.S. Persons With Respect to Certain Foreign Corporations. This is widely considered the most complex form in the entire IRS filing system. It requires detailed reporting of the foreign corporation's income, balance sheet, transactions with related parties, and previously taxed income (PTI) pools. Penalties for failure to file are $10,000 per form per year, with additional penalties of $10,000 per month (up to $50,000) for continued failure after IRS notice. Many US small business owners abroad create a local entity to operate in their host country — this entity almost always triggers Form 5471 filing requirements. Even if the foreign company earns zero profit, the form is still required. Transfer Pricing for Small Businesses Transfer pricing rules require that transactions between related entities in different countries be conducted at arm's-length prices — the same price unrelated parties would charge. For small business owners with both a US entity and a foreign entity, this applies to intercompany service fees, licensing payments, cost-sharing arrangements, and inventory transfers. While transfer pricing is often associated with large multinationals, the IRS applies the same rules to small businesses. If your US LLC pays your Canadian corporation for 'management services,' the fee must be comparable to what an independent company would charge for similar services. Documentation of the arm's-length pricing methodology is essential to avoid adjustments and penalties. GILTI and the OBBBA Changes Global Intangible Low-Taxed Income (GILTI) is a provision that requires US shareholders of CFCs to include certain income of the CFC in their US taxable income, even if the income is not distributed. GILTI was introduced by the Tax Cuts and Jobs Act (2017) and targets income that exceeds a 10% deemed return on the CFC's tangible assets (QBAI). For small business owners with foreign operations conducted through a foreign corporation, GILTI can create unexpected US tax on foreign profits. Under the One Big Beautiful Bill Act (OBBBA) changes proposed for 2026, modifications to the GILTI computation and CFC rules may further affect how foreign business income is taxed. Individual CFC shareholders face the full GILTI inclusion without the 50% deduction available to C-Corp shareholders, making the effective GILTI tax rate for individuals up to 37% versus approximately 10.5% for C-Corps. Reasonable Compensation: The IRS Audit Target S-Corporation owners who pay themselves too little salary to avoid payroll taxes are a primary IRS audit target. The 'reasonable compensation' standard requires that the salary be comparable to what a similar employee would earn for the same work. Factors include the employee's training and experience, duties and responsibilities, time and effort devoted to the business, comparable salaries at similar businesses, and dividend history. For a business generating $200,000 in profit where the owner is the sole worker, a salary of $30,000 is almost certainly unreasonable. A salary of $80,000-$120,000 would typically be defensible depending on the industry and locale. Estimated Tax Payments From Abroad US small business owners living abroad must still make quarterly estimated tax payments to the IRS. The deadlines are April 15, June 15, September 15, and January 15 of the following year. Payments can be made electronically via IRS Direct Pay, EFTPS, or by credit card. The safe harbor requires paying either 100% of last year's tax (110% if prior-year AGI exceeded $150,000) or 90% of current-year tax. Even if the FEIE eliminates income tax, SE tax is still owed quarterly. Failure to make estimated payments triggers underpayment penalties calculated on a quarterly basis at the current IRS interest rate (approximately 7% annually in 2026). Many expat business owners miss these deadlines due to time zone differences and the assumption that FEIE means no US tax is owed. Qualified Business Income Deduction (Section 199A) The QBI deduction allows eligible self-employed individuals and pass-through business owners to deduct up to 20% of qualified business income, subject to taxable income limits ($201,750 for single, $403,500 for MFJ in 2026). For business owners using the FEIE, the interaction with QBI is complex: the excluded income is not included in taxable income, which may actually increase the QBI deduction percentage on the non-excluded portion. However, income excluded under the FEIE is also excluded from QBI, reducing the deduction base. The net effect depends on total income, the FEIE amount, and whether the income exceeds the threshold. For business owners using the FTC instead of FEIE, all business income remains in QBI, potentially yielding a larger deduction.