For Chinese enterprises in the U.S., filing tax returns is not only a legal obligation, but also a key part of avoiding high penalties and reducing tax risks - remembering the wrong deadline, using the wrong filing form, or preparing materials that are not compliant may result in tens of thousands of dollars in penalties.

For this reason, AC combines the latest official rules of IRS 2026 and organizes this practical filing guide, covering the core nodes, necessary materials, and key points to avoid pitfalls, to help you efficiently complete your tax return and pass the test smoothly.

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I. Core filing deadlines (must remember-IRS official version)

Tax filing deadlines vary greatly from one business entity to another, and remembering the wrong date can easily lead to hefty penalties, so be sure to keep it in mind accurately:

1. S-Corp/Partnership (Form 1120-S/1065)

• cut-off date:: 2026March 16(postponed to the next business day due to March 15 being a Sunday)
• Key requirements: Penetrating entities, required to beFiling to be completed by March 16and issued to all shareholders/partnersSchedule K-1.;Late penalties: $290 per month per copy, no annual cap(Updated IRS standards for 2026)
• Description of the extension: ByForm 7004Application for extension toSeptember 15.;Taxes must be prepaid in full by March 16th, only deferred filing, not deferred payment of taxes

2. C-Corp (Form 1120)

• cut-off date:: 2026April 15(node commonly used by most Chinese enterprises)
• Key requirements: Separate taxable entities, based on21% Federal Corporate Income Tax RateDeclaration;Fiscal year accounting enterprise: The deadline isFifteenth day of the fourth month after the end of the fiscal year(If the fiscal year ends June 30, the deadline is October 15)
• Description of the extension: ByForm 7004Extendable toOctober 15.;Taxes must be prepaid by April 15Overdue payments are charged monthly in arrears0.51 TP3T late fee on taxes owed (up to 251 TP3T) + interest (federal short-term rate + 31 TP3T, compounded daily)

3. Generic extension rules (strict corporate/individual distinction)

• Enterprise extensions: Use onlyForm 7004(C-Corp/S-Corp/Partnership)
• Individual extensions: Use onlyForm 4868(Individuals/LLC's default penetration filing)
• Core reminders: An extension is only an extension of time to file andNon-extension of tax payment obligations; failure to make timely advance tax payments will result in aLate fee + compound interestThe tax is accrued until it is paid in full.

Hi ~ I am the customer service of Enterprise Finance Group! We provide domestic (Shenzhen, Guangzhou, Shanghai, Beijing, Hangzhou, etc.) company registration, overseas (Hong Kong, the United States, Japan, the United Kingdom, Singapore, Thailand, Vietnam, etc.) company registration, Hong Kong identity application and renewal services, while covering the cross-border tax planning, shareholding structure design, compliance and risk control programs, such as the whole chain of corporate services. Contact me at any time if you have the need.Tel: 16620947137, WeChat: Qicaiyingjituan (can be added by direct search) or scan the QR code below to add!

II. Materials Required for Filing (by Business Type - Necessary for IRS Compliance)

Preparing a complete set of filing materials in advance is a prerequisite for enterprises to efficiently complete their tax filings and avoid delays in filing due to missing materials. The following is organized by common types of enterprisesList of Required MaterialsChinese enterprises can prepare against this as required:

1. Generic mandatory materials (required for all enterprises)

Enterprise Basic Information::Copy of Certificate of Incorporation/Organization, EIN (Employer Identification Number), IRS Change of Information Filing Return (Form 8822-B, if there is a change of address/incorporation)

Core financial information::Annual financial statements (balance sheet, income statement, cash flow statement), general ledger and detailed accounts; non-English materials must be provided in English translation (professional translator/authorized person's signature), only Chinese translation IRS will not be recognized.

Tax payment related vouchers::Quarterly Advance Tax Payment Return (EFTPS Record), Return of Prior Year Tax Return (Form 1120/1120-S/1065)

Proof of identity and authorization::Copies of identity certificates of the person in charge of the enterprise and the tax return preparer; if the CPA/tax preparer is entrusted to file the return, the official IRS Form 2848 (Tax Agent Authorization Form) must be provided, and the ordinary power of attorney is invalid.

2. Typology-specific material

S-Corp / Partnership

• Additional preparation is required in addition to the common materials:
• Schedule K-1 (number of shares by number of shareholders/partners)
• Shareholder/partner identification information (U.S. tax resident/non-resident ID)
• A copy of the enterprise's profit distribution plan and partnership agreement (the percentage of profit/loss distribution and tax liabilities should be clarified).
• Form 1042-S (Withholding Tax Return) for Non-U.S. Resident Shareholder/Partner

C-Corp

• Additional preparation is required in addition to the common materials:
• Minutes of Board of Directors meetings (involving profit distribution, tax decisions)
• Record of Dividend Payments (Form 1099-DIV)
• Fiscal year accounting statement (if fiscal year returns are used)
• Cross-border transaction contracts, foreign exchange settlement certificates (in case of cross-border business)

Enterprises with cross-border operations/special circumstances

Supplementary material:

• Offshore income tax credit:Proof of foreign tax payment (official original/notarized + embassy certification), foreign branch accounting statements, and a split account between foreign and U.S. income (no credit without a split account)
• FBAR/FATCA:Overseas account flow, asset valuation report
• Public Benefit Giving:IRS-recognized donation vouchers for U.S. charities (donations to organizations in China are not deductible)
• Handling fee commission expenses:Relevant vouchers and itemized lists

3. Material considerations

• All materials must be retained in the original for inspection, and copies must be marked "consistent with the original" and signed.
• Non-English materials must be translated into English to ensure proper IRS verification.
• Materials are organized and filed in chronological order, and it is recommended to complete the material sorting and checking 2 weeks in advance to allow time for review.

Hi ~ I am the customer service of Enterprise Finance Group! We provide domestic (Shenzhen, Guangzhou, Shanghai, Beijing, Hangzhou, etc.) company registration, overseas (Hong Kong, the United States, Japan, the United Kingdom, Singapore, Thailand, Vietnam, etc.) company registration, Hong Kong identity application and renewal services, while covering the cross-border tax planning, shareholding structure design, compliance and risk control programs, such as the whole chain of corporate services. Contact me at any time if you have the need.Tel: 16620947137, WeChat: Qicaiyingjituan (can be added by direct search) or scan the QR code below to add!

III. Core Elements of Declaration (Key to Avoiding Pitfalls - IRS Compliance Version)

AC summarizes the high-frequency misunderstandings encountered by Chinese enterprises in filing, clarifies the practical points, and helps enterprises reduce the risk of non-compliance by combining with the preparation of filing materials:

1. Adaptation of entity types (to avoid declaration errors)

• S-Corp::Chinese investors are not allowed to hold shares directly, but indirectly through U.S. tax resident entities (e.g., U.S.-based C-Corp), IRS-designated qualified trusts; non-tax resident entities will be disqualified from S-Corp status.
• C-Corp::No restrictions on shareholder status, suitable for Chinese direct investment, but need to pay attention to double taxation (corporate income tax + shareholder dividend tax)
• LLC::Highest flexibility, default pass-through filing; Chinese investors can hold shares directly, but pass-through income is subject to Form 1040-NR filing and non-resident profits are subject to 30% withholding tax (no BIT exemptions)

2. Invisible compliance obligations that cannot be ignored (high-frequency risk points)

FBAR filing (FinCEN Form 114)

cut-off date::April 15, 2026, automatic extension to October 15 (no application required)

Filing Subjects::Enterprise + beneficial controller/beneficial owner (direct/indirect shareholding of 25% or more) with a single/aggregate account balance of ≥ US$10,000 (triggered on any day)

fine (monetary)::Unintentional omissions up to $10,000/year; intentional omissions/hidden accounts: account balance of $50% or $100,000 (whichever is higher), subject to criminal liability

FATCA Compliance (Form 8938)

Filing Subjects::Chinese enterprises holding stakes of 25% or more in U.S. companies, individuals/enterprises with overseas assets exceeding the threshold value

thresholds::Business assets >$50,000 at year-end or >$75,000 at any point during the year

fine (monetary)::$10,000 penalty for failure to file basis; additional $50,000 penalty for being more than 90 days overdue (non-interval)

Payroll tax returns

cut-off date::W-2 (employee) and 1099-NEC (independent contractor) issuance and filing completed by January 31st

Gradient fines::$60 per copy up to 30 days past due; $190 per copy 30-89 days; $680 per copy over 90 days; $5,700 per copy willfully late/false filing

3. Overdue Emergency Response Program (Official IRS Process)

If the deadline is accidentally missed, companies should immediately follow the steps below to minimize losses:

1. Quickly make up the report + pay off the taxes::Completion within 30 days after the due date and fulfillment of the conditions of the first violation exemption (FTA) (no violations in the past 3 years, on-time prepayment, full payment of taxes) can be applied for a reduction of penalties

2.Submission of an application for a rebuttal::Late due to force majeure (cross-border communication delays, system failures, etc.), applying for a reduction of the fine through Form 843, with adequate supporting documents required

Hi ~ I am the customer service of Enterprise Finance Group! We provide domestic (Shenzhen, Guangzhou, Shanghai, Beijing, Hangzhou, etc.) company registration, overseas (Hong Kong, the United States, Japan, the United Kingdom, Singapore, Thailand, Vietnam, etc.) company registration, Hong Kong identity application and renewal services, while covering the cross-border tax planning, shareholding structure design, compliance and risk control programs, such as the whole chain of corporate services. Contact me at any time if you have the need.Tel: 16620947137, WeChat: Qicaiyingjituan (can be added by direct search) or scan the QR code below to add!

IV. Declaration of practical recommendations (efficient landing - IRS compliance version)

1. Establish a precise countdown:

• By the end of February:Completion of S-Corp/Partnership K-1 Data Reconciliation, C-Corp Tax Measurement
• Before March 1::Completion of S-Corp K-1 issuance (allow time for shareholder reconciliation)
• the closing date7 days:Completion of declarations to allow for system congestion buffers

2. Synchronized verification of materials and declarations: Fill in the data against the prepared materials at the time of filing, focusing on checking theData consistency between financial statements, tax payment vouchers and declaration formsAvoid filling in errors

3. Prioritize full advance tax payments: regardless of whether or not it is extendedPre-payment before the original deadline(C-Corp/S-Corp required to reachPrevious year's taxable amount 100% or current year's estimated 90%), eliminating the accumulation of late fees

4. Retention of materials for backup: All filings, returns, tax payment recordsRetention of at least 7 yearsThe use of the IRS for subsequent IRS verifications or retroactive reporting is facilitated.

Hi ~ I am the customer service of Enterprise Finance Group! We provide domestic (Shenzhen, Guangzhou, Shanghai, Beijing, Hangzhou, etc.) company registration, overseas (Hong Kong, the United States, Japan, the United Kingdom, Singapore, Thailand, Vietnam, etc.) company registration, Hong Kong identity application and renewal services, while covering the cross-border tax planning, shareholding structure design, compliance and risk control programs, such as the whole chain of corporate services. Contact me at any time if you have the need.Tel: 16620947137, WeChat: Qicaiyingjituan (can be added by direct search) or scan the QR code below to add!

V. Summary of the guidelines

The 2026 tax season is tight and demanding, so it's important to keep the core nodes in mind:

• March 16 (S-Corp/Partnership)
• April 15 (C-Corp/FBAR)
• October 15 (extended filing)

For Chinese enterprises in the U.S., the core of tax filing is not to "complete the process", but to "comply with the error-free" - remember the date, prepare all the materials, pay the full amount of advance payment, and avoid the misunderstanding in order to The only way to minimize tax costs and avoid the risk of penalties.

During the tax filing process, if you have questions about entity type adaptation, cross-border tax credits, FBAR/FATCA filing, or if you need to refine the list of materials for a certain type of business, please feel free to leave a message for consultation, and we will combine the latest rules of the IRS to provide you with precise answers to help enterprises successfully complete the tax filing for 2026.

Hi ~ I am the customer service of Enterprise Finance Group! We provide domestic (Shenzhen, Guangzhou, Shanghai, Beijing, Hangzhou, etc.) company registration, overseas (Hong Kong, the United States, Japan, the United Kingdom, Singapore, Thailand, Vietnam, etc.) company registration, Hong Kong identity application and renewal services, while covering the cross-border tax planning, shareholding structure design, compliance and risk control programs, such as the whole chain of corporate services. Contact me at any time if you have the need.Tel: 16620947137, WeChat: Qicaiyingjituan (can be added by direct search) or scan the QR code below to add!