New to the U.S. Tax System
Moving to the United States can create new U.S. tax and reporting obligations for foreign accounts, businesses, investments, and income.
If you recently became a U.S. tax resident, your financial life outside the United States may now need to be disclosed or reported on a U.S. tax return. We help individuals determine what applies, what forms may be required, and how to address ongoing compliance.
Common Situations:
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Recently moved to the U.S.
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Became a U.S. tax resident while owning foreign assets
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Retained a foreign company after moving
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Hold foreign bank or investment accounts
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Need help with a first-year U.S. tax filing
Common Forms and Issues:
FBAR
Form 8938
Form 5471
Form 8858
Foreign tax credits
Residency / first-year filing analysis
Foreign Persons with U.S. Income or Businesses
Living outside the United States does not always prevent U.S. tax filing obligations.
Foreign individuals and foreign-owned businesses can face U.S. filing and reporting requirements when they operate in the U.S., earn U.S.-source income, or own U.S. entities. We help determine what filings apply and provide technically precise support for complex inbound U.S. tax matters.
Common Situations:
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Foreign-owned U.S. LLC
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Nonresident with U.S. income
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Temporary U.S. work
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U.S. business activities while living abroad
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U.S. company formed by a foreign owner
Common Forms and Issues:
Form 5472
Pro forma Form 1120
Form 1040-NR
Form 1120-F
ECI / U.S. trade or business analysis
Entity classification
U.S. Taxpayer with Foreign Assets or Businesses
U.S. taxpayers with foreign companies, accounts, or investments often face reporting requirements beyond the standard tax return.
If you are a U.S. citizen or resident and have foreign financial interests, international reporting can become significantly more complex. We help clients identify filing requirements, prepare the necessary returns, and address related international tax issues.
Common Situations:
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Ownership of a foreign company
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Interest in a foreign partnership
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Foreign financial accounts
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Foreign investments or other overseas assets
Common Forms and Issues:
Form 5471
Form 8865
Form 8858
Form 926
FBAR
Form 8938
Subpart F / GILTI
Foreign tax credits
Cross-Border Filing Problem or Cleanup
If you think an international filing was missed or handled incorrectly, the first step is understanding what should have happened.
Sometimes clients come to us after discovering a missed filing, receiving conflicting advice, or realizing that an earlier return may not have fully captured a cross-border issue. We help identify the affected years and filings and determine an appropriate path forward.
Common Situations:
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Missed international filing
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Prior-year reporting issue
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Late FBAR
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Uncertain filing history
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International tax issue discovered after the fact
Common Forms and Issues:
Missed Forms 5471 or 5472
Late FBARs
Prior-year reporting review
Residency errors
International tax remediation
Meet Your Tax Professional
Marcus Shimotsu
Marcus Shimotsu is a Certified Public Accountant specializing in U.S. international tax compliance and planning for foreign individuals and companies doing business in the United States. With extensive experience advising cross-border businesses, investors, and accounting firms worldwide, Marcus focuses on simplifying the complexities of U.S. reporting requirements—such as Forms 5471, 5472, 8865, 8858, and 3520—while developing strategies that align with each client’s global objectives.
Drawing on a background in corporate taxation and international structuring at Big 4 and large tax firms, Marcus provides tailored solutions that balance compliance with opportunity. His approach combines technical precision with practical insight, helping clients reduce exposure to costly penalties and navigate the intersection of U.S. and foreign tax regimes with confidence.
Marcus works with clients across the U.K., Asia, Europe, and beyond, offering a seamless advisory experience built on professionalism, transparency, and a deep understanding of international tax law.
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Contact us today, and let us show you how simple and efficient managing your taxes can be.