Understanding your US tax obligations before relocating is one of the most overlooked parts of the immigration process for Nigerian professionals. Getting your visa approved is step one — but the moment you become a US tax resident, the IRS wants to know about every account, every property, and every business interest you have in Nigeria.
Most Nigerian professionals discover this after the fact. Some discover it after penalties have started accruing. This article covers what you need to organize, understand, and in some cases restructure before you make the move, so tax exposure doesn’t become the problem nobody warned you about.
Read Also: How to Leave Nigeria Permanently: A Professional’s Legal Roadmap to US Residency
US Tax Obligations Before Relocating — Why the US System Is Unlike Anything in Nigeria
Nigeria taxes residents on income earned within the country. The US works differently. It taxes residents and citizens on worldwide income, regardless of where that income is earned or where the accounts are held.
That distinction has a practical implication most people miss: once you become a US tax resident, your Nigerian salary, your rental income in Lagos, your dividends from a Nigerian company, and the balance sitting in your Zenith Bank account are all visible to the IRS. Not eventually. From the moment residency is established.
Citizenship-Based Taxation: Why the US Taxes Worldwide Income
The US is one of only two countries in the world that taxes its citizens on worldwide income regardless of where they live. For non-citizens, the same obligation kicks in the moment you become a US tax resident. It can happen faster than most people expect, and in two different ways.
When You Become a US Tax Resident — The Substantial Presence Test
US tax residency for non-citizens is established either by holding a green card or by meeting the Substantial Presence Test under IRC Section 7701(b).
The green card test is straightforward: green card tax residency begins the day you are granted lawful permanent resident status and continues until the status is formally revoked or abandoned.
The Substantial Presence Test catches people off guard. It applies to anyone who spends significant time in the US, including those on work visas without a green card. The calculation works as follows:
- Count all days present in the US in the current year
- Add one-third of the days present in the previous year
- Add one-sixth of the days present two years ago
If the total reaches 183 or more, and you were present for at least 31 days in the current year, you are a US tax resident for that year under IRS Publication 519.
The practical implication for Nigerian professionals on O-1A or H-1B visas: you can trigger US tax residency before your green card is approved, purely through physical presence. That changes what you need to report, and when.
What Nigerian Professionals Must Disclose to the IRS
FBAR: Reporting Foreign Bank Accounts Over $10,000
If the combined maximum value of all your foreign financial accounts exceeded $10,000 at any point during the calendar year, you must file FinCEN Form 114, the Foreign Bank Account Report, with the US Treasury. This is separate from your income tax return and filed directly through the BSA E-Filing System.
The aggregate rule is where Nigerian professionals get caught. You are not calculating whether any single account exceeded $10,000. You are calculating whether all your Nigerian accounts combined — GTBank savings, Access Bank current account, investment account — reached that threshold at any point during the year. If yes, every account must be reported regardless of its individual balance.
The FBAR deadline is April 15 each year, with an automatic extension to October 15 — no request needed. Missing it is expensive in ways that catch people off guard. Penalties for non-willful failures can still run into five figures per violation. Willful non-disclosure carries penalties that can exceed the value of the accounts themselves, plus the possibility of criminal prosecution. The IRS treats FBAR non-compliance as a transparency issue, not a clerical one.
What you need before you leave: account names and numbers, bank names and addresses, and the peak balance of each account at any point during the year.
FATCA: What Nigerian Banks Are Already Reporting to the US
Here is something most Nigerian professionals don’t know until it matters: their Nigerian bank may already be reporting their account information to the IRS. The Foreign Account Tax Compliance Act requires foreign financial institutions to identify accounts held by US tax residents and disclose them directly to the IRS. GTBank, Access, Zenith — any institution that wants to maintain correspondent banking relationships with US financial institutions has a strong incentive to comply.
That matters because FATCA reporting and FBAR are two separate obligations running in parallel. Even if a particular account falls below the FBAR threshold, your foreign assets as a whole may trigger Form 8938 filing with the IRS once you become a tax resident. Form 8938 has higher thresholds than FBAR, varying by filing status and whether you are living in the US or abroad at the time of filing. The two forms are not interchangeable; filing one does not excuse you from filing the other, and the asset types each covers are not identical. Many people owe both. A cross-border tax specialist can tell you quickly which applies to your situation.
Form 5471: Owning a Nigerian Company While on a US Visa
This is the one that catches Nigerian founders hardest, usually because nobody mentions it during the visa process.
If you own or control a Nigerian company and become a US tax resident, you may be required to file IRS Form 5471 to report your ownership and the corporation’s financial activity. The trigger is ownership of 10% or more of a foreign corporation, or being an officer or director, or falling into other IRS-defined categories — for most Nigerian founders running active companies, at least one of those applies.
Form 5471 is one of the most technically complex international tax filings. It runs across multiple schedules and carries substantial penalties for late or incorrect filing. For Nigerian founders who own companies with active revenue, investors, or employees, this is not a form to discover after the fact. Structure matters, and restructuring becomes more complicated and more expensive once you are already inside the US tax system.
Passive Foreign Investment Company (PFIC) Rules — The Investment Trap
Certain mutual funds, foreign stocks, or investment vehicles held in Nigerian accounts may be classified as Passive Foreign Investment Companies under US tax law. PFICs require separate reporting on IRS Form 8621, and the tax treatment of income and gains from PFIC investments is punishing, often more so than the equivalent US investment would be.
Redemptions or dividend distributions from PFIC assets can trigger unexpected tax liabilities at rates that general CPAs who don’t specialize in international tax often miss entirely. Inventory your investment accounts before you move, and get a cross-border tax specialist to review whether any of them fall into PFIC territory.
The US-Nigeria Tax Treaty: What It Covers and What It Doesn’t
There Is No Comprehensive Tax Treaty Between the US and Nigeria
The United States does not have a tax treaty with Nigeria. This means income earned in Nigeria can be subject to tax in both jurisdictions once you are a US tax resident. There is no treaty framework allocating taxing rights, reducing withholding rates, or defining which country gets primary taxation rights on specific income types.
There is also no totalization agreement between the two countries. Without a totalization agreement, self-employed Nigerian professionals may have to pay into both countries’ social security systems simultaneously: US self-employment taxes and Nigerian social security obligations, with no mechanism to offset one against the other. For founders who pay themselves through their Nigerian entity, this is a material cost that most tax guides don’t flag.
How Foreign Tax Credits Can Offset Your US Tax Burden
The absence of a treaty does not mean you pay double tax on the same income without recourse. If you pay income tax in Nigeria, you may be able to claim a Foreign Tax Credit on your US return. This reduces your US tax liability by the amount of foreign tax paid, subject to limitations and the applicable income category.
The Foreign Tax Credit is not automatic and is not unlimited. It applies category by category, and excess credits in one category cannot offset liability in another. Before relocating, gather: Nigerian tax returns, proof of tax paid to FIRS, and documentation of all income sources. A cross-border expat tax compliance strategy built before you relocate is significantly more effective than one built after your first US tax filing.
Pre-Relocation Tax Planning: What to Organize Before You Move
Valuing and Documenting Your Nigerian Assets Before Green Card Status
The IRS requires all reporting in USD. Before you become a US tax resident, document the value of every Nigerian asset: bank accounts, real estate, business interests, investments, and cryptocurrency. Record values in Naira, then convert using a reliable exchange rate. The Treasury’s December 31 exchange rate is used for FBAR purposes.
This baseline valuation matters for more than reporting. If you later sell Nigerian assets, the gain calculation starts from the value at the time you became a US tax resident. Establishing that baseline clearly before residency begins reduces your exposure.
Restructuring Nigerian Business Interests Before US Tax Residency
If you own a Nigerian company, the structure of that ownership has direct implications for your US reporting obligations. Owning more than 10% of a foreign corporation triggers Form 5471. Adjusting ownership percentages, establishing holding structures, or creating subsidiaries may change your filing category, potentially simplifying obligations or reducing exposure.
These decisions are significantly easier to make before you become a US tax resident than after. Restructuring inside the US tax system adds layers of complexity that restructuring outside it does not. A cross-border tax adviser who understands both Nigerian corporate structures and US international tax rules is the right person for this conversation, not a general CPA.
The Exit Tax: What Happens If You Later Give Up Your Green Card
If you become a long-term US resident and later relinquish your green card, the IRS may impose an exit tax on unrealized gains across your worldwide assets, treating those assets as if they were sold on the day before you expatriate. Understanding this rule before you commit to permanent residency allows you to factor it into your long-term planning rather than discovering it when it’s too late to restructure.
Choosing the Right US Tax Professionals
Not all CPAs understand international tax. For Nigerian professionals with foreign income, foreign assets, and a foreign business, you need someone who specifically handles:
- Expat and international tax rules
- FBAR and FATCA reporting
- Controlled foreign corporations (Form 5471)
- PFIC identification and reporting
- Dual-status tax year filing
- Cross-border Social Security implications
A general CPA who has not dealt extensively with international clients will miss things. The cost of those misses, in penalties, back taxes, and corrective filings, far exceeds the cost of engaging the right specialist from the beginning.
Common Nigerian Immigrant Tax Mistakes That Lead to IRS Penalties
The pattern is consistent: Nigerian professionals relocate, spend their first year focused on work and settlement, and discover their tax exposure eighteen months in. By then, FBAR deadlines have been missed, Form 5471 filings have not been made, and PFIC income has been reported incorrectly or not at all.
The most common mistakes:
Filing FBAR late or not at all. Penalties for non-willful failures can reach five figures per violation and escalate sharply where the IRS determines the non-disclosure was intentional.
Not reporting foreign investments properly. The assumption that because income wasn’t remitted to the US it doesn’t need to be reported. It does.
Assuming Nigerian retirement plans and pension schemes don’t require reporting. Some do, and the analysis is fact-specific.
Miscalculating the residency test, assuming residency only begins with the green card, while the Substantial Presence Test has already triggered US tax obligations.
Ignoring dual-status tax years. The year you become a US resident is a dual-status year, with different rules for the resident and non-resident portions. Most people file it incorrectly.
All of these are avoidable with proper planning before the move.
Most Nigerian professionals discover their US tax exposure after it’s already a problem. Book a discovery call before you make the move — so you arrive informed, not blindsided.
Do I have to pay US taxes on income I earn in Nigeria?
Once you become a US tax resident, yes. The IRS taxes worldwide income: Nigerian salary, rental income, dividends, and interest are all reportable on your US tax return, regardless of whether that money ever enters the US. The Foreign Tax Credit can reduce the liability, but it does not eliminate the reporting obligation. Ignoring it leads to penalties and interest that compound quickly.
What is FBAR, and does it apply to my Nigerian bank accounts?
FBAR, filed on FinCEN Form 114, is required if the combined balance of all your foreign financial accounts exceeded $10,000 at any point during the calendar year. That is an aggregate threshold, not a per-account threshold. If your GTBank, Access, and Zenith accounts combined reached $10,001 on a single day in the year, all three accounts must be reported. The form is filed separately from your tax return, directly with FinCEN. Penalties for missing it can be substantial, even for honest mistakes, and escalate significantly where the IRS treats the failure as willful.
Is there a tax treaty between the US and Nigeria?
No. There is no comprehensive income tax treaty between the US and Nigeria, and no totalization agreement either. Income earned in Nigeria can be taxed in both jurisdictions. The Foreign Tax Credit provides partial relief, but the absence of a treaty means careful planning matters more, not less, for Nigerian professionals in the US.
When do I become a US tax resident after getting my green card?
The day the green card is granted. But tax residency can start before that. The Substantial Presence Test under IRC Section 7701(b) means that extended time in the US on a work visa can trigger tax residency independently of your immigration status. The year residency begins is a dual-status tax year with its own filing rules. Get this right from year one.
Can I own my Nigerian company while on a US work visa?
Yes, but the moment you become a US tax resident, that ownership triggers reporting obligations. Form 5471 applies if you own 10% or more of a foreign corporation, are an officer or director, or fall into other IRS categories. The form is complex, and penalties for non-filing are substantial. Founders with active Nigerian entities need a cross-border tax specialist before they relocate, not after.
⚠️ This article is for informational purposes only and does not constitute legal or tax advice. Tax laws and regulations change regularly. Consult a licensed tax professional regarding your specific situation.
