Denis Ovchinnikov - Certified Public Accountant in Carlsbad and San Diego, CA

International Tax Services

Looking for reliable international tax specialists in California? Look no further than USiBTS.

We are a distinguished firm specializing in international taxation and tax planning for corporations, LLCs, and Partnerships with foreign shareholders, partners, and foreign individual or corporate investors. Our seasoned tax specialists have extensive knowledge and expertise in navigating the intricacies of tax laws.

We understand that navigating the complex web of international tax laws can be daunting. Hence, we are dedicated to providing our clients with top-tier services that alleviate any tax-related concerns. Our international tax specialists in Carlsbad are well-versed in preparing even the most complex tax forms, including:

  • Foreign partner tax withholding for U.S. partnership - Form 8813, Form 8805, Form 8804
  • Foreign and U.S-based business entity classification - Form 8832
  • U.S. shareholders and partners of foreign entities - Form 5471 and Form 8865
  • U.S. non-resident withholding tax requirements - Form 1042 and 1042-S
  • U.S. corporation with foreign shareholders - Form 5472
  • U.S. tax return preparation for non-resident individuals working in the U.S. - Form 1040NR
  • U.S. tax return preparation for non-resident individuals working in the U.S. remotely - Form W-8 BEN
  • Foreign assets and account reporting and compliance - Form 8839, Form 3520, FinCen114
  • U.S. Persons With Respect to Foreign Disregarded Entities and Foreign Branches - Form 8858
  • Tax amnesty program consulting and preparation - Streamlined Filing Compliance Procedures
  • Tax treaty analysis
  • Foreign tax credits
  • FDII deductions

At USiBTS, we take a proactive approach toward tax planning and compliance for U.S. companies and individual investors conducting business internationally. Our services extend beyond mere consultancy on international tax inquiries and day-to-day transactions. We provide clients with comprehensive guidance on tax returns, audit representations, and other related areas.

We value the trust our clients place in us and take our responsibility towards them seriously. Our team is committed to establishing and maintaining lifelong bonds and partnerships with our clients. We are confident that by choosing USiBTS, you have taken a step toward success. Allow us to assist you in optimizing your business and leveraging our expertise to help you grow.

Contact us today for international tax preparation services in Carlsbad.


International tax preparation is the process of filing tax returns for activities or income in multiple countries.

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Our Clients Reviews

International tax client


USiBTS is the best. Not only did they help me make sound decisions, but they also followed up with me to ensure I didn’t make any other mistakes! I highly recommend them for any tax needs and financial advice. They are too good!




We were experiencing problems with our overall tax system and was on a thin line, but fortunately, we found USiBTS, which not only swooped in to save the day but resolved it quite quickly.




USiBTS handle all my personal and firm issues. After delivering me from a nightmare of complicated tax problems, everything so far has been easy. They are fast, direct, customer-oriented, and the easiest-going company I’ve ever partnered with. Kudos!



I don’t know how to thank USiBTS enough. My business would have been history if they hadn’t shown up for me. In only 24 hours, they analyzed my past tax history and put together a detailed plan, even if it was short-noticed. It was unlike anything I’ve ever seen.