U.S. Company Formation & Tax Services by Licensed CPA Team

Welcome to Shenzhen Guansai Technology

15 Years of Expertise in the U.S. Market, Empowering Chinese Businesses to Go Global

Shenzhen Guansai Technology Co., Ltd., established 15 years ago, is a professional service provider headquartered in Shenzhen, China, with branch offices in New York and New Jersey, USA. Backed by a team of U.S. Certified Public Accountants (CPAs) and elite professionals from both China and the U.S., we are committed to delivering one-stop U.S. business and tax solutions to global clients—especially Chinese enterprises and individuals.

With 15 years of industry experience and over 5,000 clients served, we have developed a deep understanding of the complex legal and tax systems in the United States, while accurately addressing the unique needs of Chinese clients.

Our Mission: Simplify Processes, Create Value

High-Demand Business Services

U.S. Company Registration

Across All 50 States & D.C.We provide registered agent services and efficient company formation in all 50 U.S. states and Washington, D.C., including Delaware, Wyoming, and New York. Our services cover LLCs, C-Corporations, and S-Corporations with fast and compliant registration processes

U.S. Tax Filing Services

We offer fast, compliant tax filing for individuals and companies, including 1040, 1040-NR, 1120, and 1120S. Handled by licensed U.S. CPAs, fully remote and secure.we handle everything accurately, efficiently, and remotely—so you can focus on growth while we take care of tax.

U.S. ITIN Application Service

As an IRS-authorized Certifying Acceptance Agent (CAA), we assist eligible individuals in applying for an Individual Taxpayer Identification Number (ITIN), helping those without an SSN meet U.S. tax filing requirements.

U.S. Bank Account Opening

We help set up business checking accounts for your U.S. company (LLC, C-Corp, S-Corp, etc.), as well as personal checking or savings accounts for individuals with U.S. income or asset management needs.Our services support essential operations such as daily transactions, transfers, supplier payments, and linking with Stripe, PayPal, and other payout platforms.

Annual Compliance & Company Dissolution

Ensure your U.S. company remains in good standing by filing required annual reports with the state government on time, and staying fully compliant with ongoing legal obligations.We provide professional guidance and support for the lawful dissolution, liquidation, and closure of U.S. companies, helping you exit smoothly and avoid future liabilities.

Trademark, Copyright & Patent

We offer consulting and agency services for U.S. trademark registration, copyright filing, and patent applications to protect your intellectual property.Our professional team handles application filings, responds to Office Actions, manages opposition proceedings, and guides examination communications.to safeguard your core business and market position.

Why Choose Shenzhen Guansai Technology Co., Ltd.?

Your Trusted Partner for U.S. Business and Tax Services
With 15 years of dedicated experience in the U.S. market,
We empower Chinese enterprises to set sail and expand globally.
Our Mission: Simplify Processes, Create Value

Service with No Time Difference

China Headquarters (Shenzhen):
Close to Chinese clients, deeply understanding their needs, providing localized communication and support.

U.S. Branches (New York & New Jersey):
Our U.S.-based CPA team directly handles your company formation, tax filing, and other core services, ensuring compliance with the latest U.S. regulations and offering local expertise.

Seamless Coordination:
The China and U.S. teams work closely together to ensure that wherever you are, you receive efficient and responsive service without time zone delays.

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U.S.-Based CPA Team

Our core tax and complex compliance services are led by a team of seasoned Certified Public Accountants (CPAs) licensed in the United States.
They possess deep expertise in U.S. tax laws and extensive practical experience, serving as your strongest assurance for tax compliance and strategic planning.

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15 Years Industry Experience

With more than 15 years dedicated to U.S. business and tax services, we have accumulated deep industry knowledge and extensive experience handling a wide range of complex cases.We understand which solutions are most effective and can anticipate potential risks to better protect your interests

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Trusted by Over 5,000 Clients

We have successfully served more than 5,000 clients from diverse industries and varying scales.Our extensive client base is a testament to our professional expertise and service quality, providing us with broad experience in solving a wide range of challenges.

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One-Stop Customer Services

From US company formation and tax compliance to intellectual property protection, bank account opening, and annual maintenance, we provide end-to-end solutions covering the entire lifecycle of your business in the U.S.This ensures you avoid the hassle of dealing with multiple service providers.

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Customized Solutions

We understand that every client has unique circumstances and goals.Instead of a one-size-fits-all approach, we tailor the optimal solution based on your specific situation and business vision.

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