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The short answer
The 24-month STEM OPT extension is built around an employer: it must be enrolled in E-Verify, sign a Form I-983 training plan with you, and report changes to your school. Side gigs for Nigerian clients do not come with any of that, so they are not covered by your STEM OPT authorisation unless that work itself meets the same rules. Unemployment is also capped at 150 days in total across OPT and the extension.
How STEM OPT differs from regular OPT
Post-completion OPT lets an F-1 graduate work in a field directly related to the degree. The STEM extension adds up to 24 months on top, for a maximum of 36 months of OPT in total according to the State Department's 9 FAM 402.5. The rules for the extension come from a Department of Homeland Security rule published on 11 March 2016 and effective from 10 May 2016, and they are much tighter about who you work for.
| Requirement | What the 2016 rule says |
|---|---|
| Employer | Must be enrolled in and remain in good standing with E-Verify |
| Training plan | You and the employer prepare and sign Form I-983, the Training Plan for STEM OPT Students |
| Pay and conditions | Must be commensurate with similarly situated US workers |
| Employer reporting | Changes in your employment reported to your DSO within five business days |
| Your reporting | Six-month validation of your details, plus an annual self-evaluation and a final evaluation |
| Unemployment | 90 days during initial OPT, 60 more with the extension: 150 days in total |
Why a side gig is different
Your STEM OPT authorisation sits on the job described in your I-983. The plan names the employer, the role, the supervisor and the training goals, and the employer attests to them. A Nigerian fintech that pays you for weekend work, a Lagos agency that sends you design jobs, or a cousin's logistics firm that wants a dashboard does not sign your I-983, is not your E-Verify employer, and does not report to your DSO. Work for them sits outside the authorisation you hold.
Paid work outside your authorisation is risky for any F-1 student. Under 8 CFR 214.1(e), unauthorised employment by a nonimmigrant is a failure to maintain status. That record can follow you into an H-1B petition or a green card case.
Can a second job ever count?
The rule's structure is about each employer meeting the conditions. If a second role is meant to count, that employer would have to meet the same E-Verify, training plan and reporting conditions, and the role would have to relate to your STEM degree. A Nigerian client with no US presence will normally not be enrolled in E-Verify. Ask your DSO before you agree to anything; the DSO is the person who records your employment in SEVIS.
Common situations
- Your US employer allows outside work. That is a contract point, not an immigration one. Your employer's permission does not authorise the side gig.
- The Nigerian client offers equity instead of pay. Shares for work are still payment for work. Read taking equity for freelance work before agreeing.
- You lose your STEM OPT job. The unemployment clock runs. Freelancing for Nigerian clients does not stop it unless the work is itself properly authorised and reported.
- You visit Nigeria and work there for a few weeks. Different facts; ask your DSO and a lawyer about travel on OPT and about the tax side before you go.
Keeping the client relationship
Saying no to a Nigerian client now does not have to end the relationship. Explain that your work permission is tied to your current employer, offer to recommend a colleague in Nigeria, and keep in touch. If your US employer has a Nigerian client or partner, a properly structured project through that employer may let you do related work within your training plan, provided the I-983 and your DSO cover it. Once your status changes, the client will still be there, and you will be able to invoice without risking your case.
Tax if you are authorised
Once work is properly authorised, it is taxed like any other income. Your US tax status as a nonresident or resident alien can change during OPT, so ask a tax preparer which applies to you. If you are a resident for tax purposes, worldwide income, including Nigerian fees, is taxable, and net self-employment earnings of $400 or more bring self-employment tax of 15.3% per the IRS. A Nigerian company paying a non-resident for professional or technical services generally deducts 10% withholding tax under the 2024 regulations, per PwC's Nigeria summary.
Steps before saying yes to a client
- Read your I-983 again: the employer, role and dates are your authorisation.
- Tell the client you need to check your status before agreeing to anything.
- Ask your DSO in writing whether the work can be authorised, and keep the reply.
- If the answer is no, offer the client a referral or a start date after your status changes, for example after an H-1B or a green card.
- Keep your unemployment day count accurate if your main job ends.
Where Pryme fits
A Pryme Personal Account opened from the US holds NGN, USD, GBP and EUR with local details for each, which helps with salary in dollars and family commitments in naira. It is not a way around STEM OPT rules. When you are authorised to take clients, a Business Account adds invoicing and the business agents.
Questions people ask
Can I freelance on STEM OPT?
Only if the work meets the STEM OPT conditions: an E-Verify employer, a signed I-983 and reporting to your DSO. Freelance clients in Nigeria normally meet none of them.
How many unemployment days do I get on STEM OPT?
The 2016 rule allows 90 days during initial OPT and 60 more with the STEM extension, 150 days in total.
Does my employer have to report if I leave?
Yes. The rule requires the employer to report changes in your employment to your DSO within five business days.
Can my US employer let me take Nigerian clients on the side?
Your employer can allow it contractually, but that does not give you immigration authorisation for the side work. Ask your DSO.
Sources
- Federal Register: Improving and Expanding Training Opportunities for F-1 Nonimmigrant Students With STEM Degrees (final rule, 11 Mar 2016, effective 10 May 2016) · accessed Oct 2026
- US Department of State, 9 FAM 402.5 Students and Exchange Visitors (rev. 29 Apr 2025) · accessed Oct 2026
- 8 CFR 214.1, Requirements for admission, extension, and maintenance of status (Cornell LII) · accessed Oct 2026
- IRS: Self-employment tax (Social Security and Medicare taxes), updated 27 Jun 2026 · accessed Oct 2026
- PwC Worldwide Tax Summaries: Nigeria, corporate withholding taxes (reviewed 29 May 2026) · 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.