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U.S. Corporate Tax Services

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MFI Consulting helps Canadian and U.S. businesses navigate complex federal, state, and local corporate tax compliance. We prepare and file tax returns for C-corporations, S-corporations, LLCs, and partnerships with cross-border operations, ensuring you stay compliant and tax-optimized.

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  U.S.–Canada cross-border corporate tax
  Federal and multi-state tax returns
  Corporate, LLC, and partnership returns


Explore more MFI services:

  • U.S. Corporate Tax Returns (Form 1120, 1120-F) 

  • LLC and Partnership Returns (Forms 1065, 1120-S) 

  • State and Local Income, Franchise, and Gross Receipts Tax Compliance

  • Cross-Border Tax Planning and Entity Selection (C-Corp vs LLC vs LP)

  • U.S. Sales and Use Tax Filing Reviews and Voluntary Disclosures

  • Withholding, Information Returns, and Foreign Reporting Support (e.g., 1042-S, 5472)

MFI Consulting > U.S. Corporate Tax

U.S. Corporate Tax for Cross-Border Businesses

U.S. tax rules are complex, especially when a Canadian or foreign-owned business has sales, employees, warehouses, or real estate in the United States. At MFI Consulting, we help closely held companies navigate federal, state, and local tax obligations so leadership can focus on running the business. From initial U.S. entry to ongoing filing and exit planning, we support corporations, LLCs, and partnerships at every stage of their cross-border lifecycle.

Why work with MFI for U.S. corporate tax?

No two U.S. structures are the same, especially when owners live in Canada and operations span multiple states. Your tax exposure depends on entity type, treaty position, permanent establishment, and state nexus, not just where a company was incorporated. MFI designs tailored compliance and planning strategies so your U.S. tax footprint is understood, documented, and optimized rather than left to chance.


Typical entities and structures we support:

  • Canadian corporations with U.S. branch or subsidiary 
  • Single-member and multi-member LLCs 
  • Limited partnerships (LPs) and LLPs 
  • S-corporations and C-corporations 
  • Professional and consulting corporations with U.S. clients
The goal is to keep your filings accurate and penalty-free while aligning the structure with long-term business and personal tax objectives.

What we do (U.S. corporate, LLC & partnership tax)

  • Federal corporate income tax returns: Preparation of Forms 1120 and 1120-F for U.S. corporations and foreign corporations with U.S. activities, including treaty-based positions (Form 8833) where appropriate.

  • State and local income/franchise tax: Identification of filing requirements, nexus analysis, and preparation of state and city corporate tax returns (income, franchise, gross receipts).

  • LLC and partnership filings: Preparation of Forms 1065, 1120-S, K-1s for partners/shareholders, and guidance on how classification affects Canadian and U.S. tax outcomes.

  • Cross-border planning: Review of ownership and financing structure to reduce double taxation, manage withholding, and coordinate with Canadian tax rules and foreign tax credits.

  • U.S. information reporting: Forms 5472, 8858, 8865, 8938 and other foreign/international forms as required for cross-border groups.

  • Sales and use tax: High-level review of economic nexus thresholds and referrals for detailed sales tax implementation if extensive multi-state obligations exist.

  • Tax provision and year-end support: Assistance with U.S. tax provision calculations, adjustments, and working papers for financial statement purposes.

  • Voluntary disclosures and clean-up: Catch-up filings for missed federal or state corporate returns, late information forms, and negotiation of reasonable cause where appropriate.

Cloud processes, clear documentation

All U.S. tax engagements are managed with secure, cloud-based tools so you can collaborate from anywhere. Document requests, working papers, and draft returns are centralized, and communication is tracked to keep everyone aligned on status and next steps. This approach keeps supporting schedules, elections, and treaty disclosures organized and ready for both the IRS and CRA.

Cross-border tax is our specialty

Operating entities in both Canada and the U.S. creates overlapping tax jurisdictions, withholding obligations, and information-reporting complexity. We work daily with businesses navigating these rules:

  • Treaty benefits and permanent establishment: Proper use of the Canada-U.S. tax treaty to avoid or reduce U.S. corporate tax exposure.

  • State nexus and apportionment: Determining which states require filing and how income is allocated when operations cross state lines.

  • Withholding on cross-border payments: FDAP withholding, Form 1042/1042-S, and W-8/W-9 compliance for payments between related entities and third parties.

  • Transfer pricing and intercompany charges: Documentation of arm's-length pricing for services, royalties, and management fees to satisfy both IRS and CRA requirements.

How we work with you

  1. Discovery & structure review – We map your entities, ownership, operations, and existing filings to identify gaps and compliance risks.

  2. Planning & entity optimization – Recommendations on entity classification, treaty positions, and restructuring opportunities to reduce your overall tax burden.

  3. Preparation & filing – Timely preparation of federal, state, and international forms with full documentation and coordinated filing across jurisdictions.

  4. Ongoing support & representation – Year-round advisory, responses to IRS and state notices, and proactive planning for changes in operations or ownership.

Benefits you’ll notice quickly

Focus on your business while we handle the complexity of U.S. corporate tax compliance. You'll have confidence that returns are filed correctly and on time, reducing the risk of penalties, interest, and audit exposure. Our cross-border expertise means your Canadian and U.S. tax obligations are coordinated, not duplicated. And because we work with you year-round, you'll receive proactive planning advice—not just reactive compliance—so you can make informed decisions about expansion, distributions, and restructuring.

Flexible packages

Choose annual tax planning packages for predictable, all-inclusive U.S. tax filing, or engage us for one-time projects like entity formation, voluntary disclosure, or tax planning reviews. We scale with your needs: from a single LLC return to multi-state consolidated groups with dozens of entities.

Ready to simplify your U.S. corporate tax compliance?

Let's review your U.S. structure, identify filing requirements, and design a compliance plan that keeps you penalty-free and tax-optimized. Contact us today for a no-obligation consultation.


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