Changing employers on a work visa — the safe way

Your visa ties you to a sponsor—your current employer on an H-1B, your school on an F-1—but that does not trap you. The law allows movement, but only if you follow the timing and paperwork rules precisely. Making even a small mistake—starting work one day too early, or failing to keep a receipt—can create problems that follow you for years, especially if you later apply for a green card.

H-1B Transfer: When You Can Actually Start

An H-1B transfer is not a true transfer. Your new employer files a completely new petition (Form I-129) with USCIS. The good news: you do not need to wait for USCIS to approve it. You can start working as soon as USCIS receives the petition, provided you meet the portability rules.

The Filing Moment

Your new employer must first obtain a certified Labor Condition Application (LCA) from the Department of Labor. This typically takes seven to ten calendar days. Once approved, they file the I-129 with USCIS. The key date is when USCIS receives the petition—that is when portability begins.

USCIS will issue a receipt notice called Form I-797C. This notice is your proof that USCIS accepted the petition. Most employers require it before letting you start, even though the law says you can start once the petition is properly filed and delivered. If you can show proof of delivery (a UPS or FedEx tracking number, or email confirmation), you may be able to start even sooner, but waiting for the I-797C receipt is far safer.

Three Hard Requirements for Portability

• Your current H-1B status must be valid when the new petition is filed. If your H-1B has already expired, portability does not apply.
• You must have been issued H-1B status before. If this is your first H-1B, you cannot use portability even if a new employer files.
• You must have been lawfully admitted to the United States. A single day of unauthorized employment disqualifies you from portability.

If you left your first employer and there is a gap before the new petition is filed, that gap may be covered under a 60-day grace period—but USCIS grants this period at its discretion, and it is not guaranteed. Do not rely on it. File the new petition as soon as your offer is finalized.

What Happens If the Petition Is Denied

If you start work under portability and USCIS later denies the petition, your work authorization ends immediately. You must stop working at that point. If you continue, you become unlawfully present, which damages your ability to sponsor a green card or obtain future visas. Your only options are to return to your previous employer (if that H-1B is still valid) or leave the United States.

F-1 Students: CPT and OPT Authorization Must Come First

F-1 is a student visa. Work off-campus is an exception to the rule, not a right. The rules for CPT (Curricular Practical Training) and OPT (Optional Practical Training) are strict: you cannot work before your authorization is officially granted. Period. 'Starting Monday' is not a defense.

Curricular Practical Training (CPT)

CPT allows you to work off-campus while still enrolled as a student, provided the job is directly related to your major and required or credit-bearing. Your Designated School Official (DSO)—an immigration officer at your school—authorizes CPT by annotating your Form I-20, which is your Certificate of Eligibility for Nonimmigrant Student Status.

You cannot begin work before the start date listed on your I-20. You cannot continue work after the end date listed. If you work outside those dates, you are working illegally and could lose your visa status. There is no gray area here.

1. Apply for CPT at least two weeks before your intended start date.
2. The DSO will update your I-20 with the CPT authorization dates.
3. You must have the signed I-20 in hand on your first day of work.
4. If you need to extend or change your CPT, you need a new I-20 from your DSO before resuming work.

One further trap: if you work 12 months or more in full-time CPT, you become ineligible for OPT entirely. Part-time CPT does not count toward this limit, but full-time hours do. Many students lose their post-graduation work eligibility this way.

Optional Practical Training (OPT)

OPT is work authorization granted by USCIS, not your school. Your DSO recommends it in SEVIS (the Student and Exchange Visitor Information System) and updates your I-20. You then file Form I-765 (Application for Employment Authorization) with USCIS and pay a filing fee. USCIS issues an Employment Authorization Document (EAD) card.

You cannot work until you physically receive the EAD and the start date on the card has arrived. If USCIS approves your application but the card is in transit, you are not authorized to start. 'The approval came through' is not enough. You must hold the card in your hands.

After graduation, you can use up to 12 months of OPT in your field of study. If your degree is in STEM (Science, Technology, Engineering, Mathematics), you may be eligible for an additional 24-month extension. Each tier of education—bachelor's, master's, PhD—carries its own 12-month OPT allowance, so you can do OPT at the master's level even if you used OPT after your bachelor's degree.

Keep Every Receipt and Document

Every Form I-797 approval notice, every I-797C receipt notice, every I-94 (your Arrival/Departure Record), every pay stub, and every updated I-20 should be copied and kept for as long as you are in the United States and for years afterward. These documents are the backbone of your immigration file.

If you later apply for a green card, USCIS will reconstruct your employment history. If there are gaps in your paper trail—missing paystubs, no I-797C receipt for a transfer, no copy of the I-20 showing CPT authorization—USCIS may assume you worked without authorization. Closing those gaps later is costly and slow. Keeping copies from the start is free insurance.

• Form I-797 or I-797A approval notice for your visa status (H-1B, F-1, etc.).
• Form I-797C receipt notice for any transfer or change of employer petition.
• Your I-94, which shows your allowed departure date and admission class.
• All versions of your I-20 from your school (for F-1 students), including CPT and OPT authorizations.
• Pay stubs from every job, in order, covering the full tenure.
• The I-765 or EAD approval for OPT work.
• Any Request for Evidence (RFE) responses you submitted to USCIS.

Organize these by date and job. Scan them and store copies in a cloud drive and an external hard drive. If your employer or school loses records, you have your own. If USCIS asks for proof five years later, you will have it.

Common Mistakes and How to Avoid Them

Starting Work Too Early

For H-1B transfers, do not start until USCIS has received the petition. For F-1 students, do not start until CPT is authorized in SEVIS or the EAD for OPT is in your hands. Employer pressure—'we need you Monday'—is not a legal exception. If caught, you will be charged with working unlawfully, and your visa status will be revoked.

Forgetting to Update Your School

If you are an F-1 student and you change employers during CPT or OPT, you must report the change to your DSO within ten days. If you miss this deadline, your school's SEVIS record will be inaccurate, and that inaccuracy will appear on future visa applications and green card petitions. USCIS uses SEVIS records to verify your legal status.

Losing Track of Your I-94

Your I-94 (Arrival/Departure Record) is issued on your arrival in the United States or updated when your status changes. It shows your allowed departure date. Many people lose their I-94 or never know they have one. If your passport is stamped with an H-1B visa, your I-94 may be printed on the back of the visa stamp, or it may be electronic only. When you apply for a green card, USCIS needs to verify your I-94 number and expiration date. If you cannot find it, request a replacement from USCIS using Form I-131 (if you are outside the US) or consult your immigration lawyer for the correct procedure.

When You Change Jobs: A Checklist

1. Verify your current visa status is valid and that your passport visa stamp is not expired (even if your authorized stay extends beyond the stamp expiration).
2. If H-1B: ensure your new employer files the transfer petition before your current status expires. Do not resign until the petition is filed.
3. If H-1B: wait for the I-797C receipt before starting work. Confirm it with your new employer's HR or lawyer.
4. If F-1 with CPT: get a new I-20 with CPT authorization from your DSO, and do not start work before the start date listed.
5. If F-1 with OPT: verify that USCIS has approved your Form I-765 and that you have received the EAD in the mail.
6. Collect paystubs from your old employer covering the entire tenure (last month of employment, especially).
7. Copy your new employer's offer letter and any employment agreement.
8. Save your I-94, all I-797 notices, and all I-797C receipts.
9. If F-1: request and save all I-20 forms from your school showing CPT or OPT authorization.
10. If F-1: notify your DSO of your new employer and job title within ten days of starting.

Seeking Help

Immigration rules are technical and the cost of error is high. If you are unsure whether you meet portability requirements, whether you can start work, or whether your documents are in order, consult an immigration attorney licensed in the United States before you resign or accept an offer. Many offer a consultation at no cost or low cost. Paying for an hour of advice now is cheaper and safer than paying to fix a status violation later.

If you are an F-1 student, your school's designated school official is your first stop. They know your SEVIS record and can tell you exactly when you are authorized to work and what forms you need.