USA · TAX ADVISORY
Federal and state tax planning for LLC and C-Corp. EIN, ITIN, FBAR, and annual filing preparation. From $150/hr or fixed fee. Fully remote.
US tax for foreign founders
US tax obligations for foreign-owned companies differ significantly from those for US residents. The key questions are whether your LLC or C-Corp has US-source income, US business activity, and US reporting obligations.
Foreign-owned LLC
Pass-through
Disregarded entity — no entity-level US tax on non-ECI income. Annual Form 5472 + 1120 still required regardless of activity.
C-Corp (21% federal)
21%
21% federal corporate tax on net profit + state taxes. Dividends to foreign shareholders taxed at 30% withholding (reduced by treaty).
EIN — required for everything
Day 1
Required to open a US bank account, work with Stripe/Brex, hire employees, and file returns. Included in MOSTAR's incorporation fee.
ITIN for foreign founders
Form W-7
Required for foreign founders with US tax obligations who are not eligible for a Social Security Number. MOSTAR assists with the W-7 application.
FBAR filing
FinCEN 114
US entities with foreign accounts over $10,000 at any time must file annually. Penalties for non-compliance are significant.
State taxes
Vary by state
Delaware has no state corporate tax for companies not operating in Delaware. Wyoming and Nevada are also tax-friendly. California and NY impose additional taxes.
Pricing
Fixed fees agreed upfront before any work begins. Hourly rate for advisory and research.
Tax Advisory
US federal and state tax planning. Structuring advice for LLC and C-Corp. Treaty analysis.
Hourly rate
$150
per hour · fixed fee by scope available
Annual Tax Preparation
Federal and state return preparation. Form 1065, 1120, or 1120-F depending on entity type.
Fixed fee from
$800
per year · complexity may increase fee
EIN & ITIN Applications
Standalone EIN or ITIN applications for founders who already have a formed US company.
Fixed fee
$200
per application
How it works
Scoping call
We review your entity structure, where you operate, and home country tax obligations. Scope and fee agreed before work starts.
Day 0
Document collection
We provide a checklist of required documents. All submitted remotely — no in-person meetings required.
Week 1
Preparation & review
Returns prepared and sent for your review before filing. You sign and we file electronically where possible.
Weeks 2–4
Frequently asked questions
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