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The short answer
For a US citizen or resident, 10% of a Nigerian company is the line where Form 5471 can start: acquiring stock that brings you to 10%, or selling below it, is a Category 3 event, and being a 10% shareholder of a company that US shareholders together control more than 50% of makes you a Category 5 filer (IRS Form 5471 instructions, December 2025). Below 10%, Form 5471 usually does not apply to a pure shareholder, but Form 8938 can.
Why 10% matters
US citizens and tax residents, including green card holders, are taxed on worldwide income (IRS Publication 54). Owning part of a foreign company is not itself taxed, but the IRS wants information about it once your stake is large enough. A Nigerian private limited company is a foreign corporation for this purpose, and the US has no income tax treaty with Nigeria (IRS treaty list, reviewed January 2026), so no treaty rule changes the picture.
The full rules for owners and controllers are in our guide to Form 5471 for US owners of a Nigerian company. This article is about the minority owner: the person with 10%, 15% or 30%, not the founder with control.
The categories a minority owner can fall into
| Situation | Category (Form 5471 instructions, Dec 2025) | What it means for you |
|---|---|---|
| You buy or are allotted shares that take you to 10% or more | Category 3 | A filing for the year you crossed the line |
| You become a US person (for example get a green card) while already holding 10% or more | Category 3 | A filing for the year you became a US person |
| You sell or are diluted so you fall below 10% | Category 3 | A filing for the year of the disposal |
| You are an officer or director when a US person acquires 10% or an extra 10% | Category 2 | Even with no shares yourself |
| You hold 10% or more and US shareholders together own more than 50% by vote or value | Category 5 | Annual filing while the company is a controlled foreign corporation |
| You own more than 50% yourself | Category 4 | Control: covered in the guide above |
If you hold 10% to 50% and the other owners are Nigerians living in Nigeria, the company is usually not a controlled foreign corporation, so Category 5 does not apply. You still face Category 3 in the year you cross 10% in either direction.
Counting to 10%
The instructions measure 10% by vote or value, and count shares owned directly, indirectly (through another company or trust) and constructively. Constructive ownership means shares held by certain relatives or related entities can be treated as yours. A family company where your mother, your spouse and you each hold small stakes can therefore reach 10% for one person without that person holding 10% on the share register. Ask your accountant to map who counts.
Worked example
Example only. Tunde, a green card holder in Atlanta, holds 8% of his uncle's Ibadan printing company. In 2026 he buys more shares, reaching 12%. His two cousins in Maryland, both US citizens, hold 25% each.
- Tunde crossed 10% in 2026: Category 3 for 2026.
- US shareholders with 10% or more now own 12% + 25% + 25% = 62%, more than 50%, so the company is a controlled foreign corporation.
- Tunde and both cousins are Category 5 filers for each year this lasts, and the CFC income rules may apply to them.
- If Tunde had stayed at 8%, he would not be a US shareholder, the US-owned total among 10% holders would be 50%, not more than 50%, and the company would not be a CFC on those facts.
One share purchase changed the position for three people. That is why US-based family members should agree before anyone buys or sells. For what CFC status means for tax, see is my Nigerian company a CFC.
Below 10%: Form 8938 and FBAR
Under 10%, a pure shareholder is generally outside Form 5471, but other forms can apply. The IRS comparison chart (September 2026) lists foreign stock held outside a financial account as reportable on Form 8938, not on the FBAR. Form 8938 has value thresholds that depend on where you live and how you file: for an unmarried person living in the US, more than $50,000 on the last day of the year or $75,000 at any time. Shares held through a Nigerian stockbroking account can bring the FBAR into play as an account.
Penalties and timing
- Form 5471 is attached to your income tax return and is due with it, including extensions.
- Late or missing: $10,000 per company per annual period, plus $10,000 for each 30 days after the 90-day IRS notice period, up to a further $50,000 (instructions, December 2025).
- Foreign tax credits can be reduced by 10%, plus 5% for each further three months.
What to ask the Nigerian company for
- A current share register or CAC status report showing every holder and their percentage.
- The year's financial statements in English, early enough for your US return.
- Details of any shares issued or transferred during the year, with dates.
- Dividends paid and Nigerian tax withheld, for your own return.
Where Pryme fits
Pryme does not prepare US tax forms. Where you receive dividends from a Nigerian company, a Pryme account can hold them in naira or dollars, and a verifiable statement generated with VerifyDoc.ai gives your accountant a record that anyone can check is genuine. Information only, not tax advice.
Questions people ask
Do I need to file Form 5471 if I own 10% of a Nigerian company?
Possibly. Acquiring stock that takes you to 10% is a Category 3 event, and you are a Category 5 filer if US shareholders together own more than 50%. Check the Form 5471 instructions with an accountant.
What if I own less than 10%?
Form 5471 usually does not apply to a pure shareholder below 10%, but the shares can be reportable on Form 8938 above the value thresholds.
Do my relatives' shares count towards my 10%?
They can. The 10% test includes indirect and constructive ownership, so shares held by certain relatives or related entities may be treated as yours.
What is the penalty for missing Form 5471?
$10,000 per company per year, plus up to $50,000 more after IRS notice, and a possible cut in foreign tax credits.
Sources
- IRS: Instructions for Form 5471 (Rev. December 2025) · accessed Oct 2026
- IRS: Comparison of Form 8938 and FBAR requirements (reviewed 19 Sep 2026) · accessed Oct 2026
- IRS: United States income tax treaties, A to Z (reviewed 3 Jan 2026) · accessed Oct 2026
- IRS: Publication 54, Tax guide for US citizens and resident aliens abroad (Rev. 12/2025) · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.