By NuVine Advisory | November 2025

As the end of the year approaches, U.S. startups—especially those founded or owned by international entrepreneurs—face a critical period of financial, tax, and regulatory responsibilities. Missing these deadlines can result in penalties, delayed filings, or unnecessary complications when you raise capital, open bank accounts, or expand operations.

To help founders stay organized, NuVine Advisory has prepared a clear, practical Year-End Compliance Checklist that covers the most important requirements for domestic and foreign-owned companies.

1. Verify Entity Information & Compliance Status

Before diving into tax forms, confirm that your business entity is in good standing.

✔ Check state compliance

• Annual reports filed?
• Franchise taxes paid (Delaware, California, etc.)?
• Registered Agent information up to date?
• Correct company address on state records?

Why it matters:
States can suspend or forfeit your company if you miss deadlines, which may freeze your bank account or block investors from wiring funds.

2. Beneficial Ownership Information Report (BOIR)

Deadline for entities formed before 2024: January 1, 2025
Ongoing deadline for new entities: within 30 days of formation

Many founders—especially international founders—are unaware that BOIR filing is mandatory for almost all U.S. companies.

You must file if you:

• own a U.S. LLC, C-Corp, or S-Corp
• are foreign-owned
• are a single-member LLC

BOIR includes:

• company details
• beneficial owners (individuals with 25%+ ownership or substantial control)
• ID documents

Failure to file can result in penalties of $591 per day, up to $10,000.

3. U.S. Federal Tax Filings (Including Foreign-Owned Entities)

Different structures have different year-end responsibilities.

Single-Member LLC (Foreign-Owned): Form 5472 + Pro-Forma 1120

This is one of the most commonly missed filings.

Foreign-owned U.S. LLCs must file:

• Form 5472
• Pro-forma Form 1120

Deadline: April 15 (with extension to October)

Penalties:

• Starting at $25,000, increasing if ignored.

Important:
Even if you have no revenue, expenses, or activity, the filing is required.

Multi-Member LLC: Form 1065

LLCs with two or more members must file a partnership return.

Deadline: March 15

Corporations (C-Corp): Form 1120

Deadline: April 15
Foreign-owned C-corps must also evaluate:

• Transfer pricing / intercompany charges
• Thin capitalization rules
• Withholding tax on foreign shareholders

S-corps: Form 1120-S

Deadline: March 15

4. Bookkeeping & Financial Statements

Investors, banks, and accountants will require a clean set of books.

Year-end tasks:

• Reconcile all bank accounts
• Categorize all expenses
• Record founder equity contributions and loans
• Prepare a year-end Balance Sheet & P&L
• Review AP/AR and outstanding invoices

International founders:
Do not mix personal and business accounts—this is a major compliance risk and makes tax filings difficult.

If bookkeeping is behind, now is the time to catch up.

5. Payroll, Sales Tax, and State TaxesReview whether your business triggered any tax nexus during the year.

You may need to file/pay:

• Payroll taxes (if you hired contractors or employees)
• State income/franchise taxes
• Sales tax (physical or economic nexus)

Non-U.S. founders often underestimate sales tax obligations, especially with online sellers or software providers.

6. Delaware Franchise Tax (for all Delaware corporations)

Even if you operate outside Delaware or have zero revenue, you must file and pay this tax.

Deadline: March 1
Range: $400 to $200,000+ depending on share structure.

7. Update Corporate Records

Founders should complete annual internal governance tasks.

For corporations:

• Board resolutions
• Shareholder minutes
• Updated cap table
• Stock issuance confirmations

For LLCs:

• Annual Operating Agreement review
• Member contributions and distributions

This is especially important if you plan to raise capital.

8. Review Cross-Border Money Flow

For foreign-owned entities, year-end is the best time to fix cross-border structuring issues.

Key items to check:

• Were intercompany transfers categorized correctly (loan vs equity)?
• Was interest calculated if needed?
• Do you have documentation supporting transfer pricing?
• Are you prepared to explain large inbound wire transfers to your U.S. bank or IRS?

A review now can prevent red flags during tax filing.

9. Prepare for the New Year

Use December to set up your company for a strong start in 2026.

Plan for:

• Budget and cash flow forecast
• Tax strategy session
• KPI dashboard refresh
• Updated compliance calendar
• Entity cleanup (if you plan to convert to a C-Corp for fundraising)

ConclusionYear-end is a critical time for U.S. startups—especially foreign-owned entities with additional cross-border tax and reporting requirements. Getting ahead of compliance not only avoids penalties but also strengthens investor readiness and operational clarity.

If you need support with your year-end U.S. compliance, entity structuring, or cross-border tax planning, NuVine Advisory is here to help.