As of November 6, 2026, this post sums up the official pages linked here.

The question

You're on an H-1B. A new company has made you an offer, and its HR team says: "We'll file your petition this week. Can you start on the 1st?" Your friend says you have to wait for the approval. Your recruiter says you don't. Who is right?

Our team at CloudSkill Consulting LLC read the rule and the USCIS pages on this. Below is what they say, in plain words.

The short answer

In most cases you don't have to wait for approval. Under H-1B portability, you may start at the new company once it properly files a non-frivolous Form I-129 for you, or on the start date written in that petition, whichever is later. (8 CFR 214.2(h)(2)(i)(H); USCIS: H-1B Specialty Occupations)

"Non-frivolous" just means a real, good-faith petition. Form I-129 is the petition an employer sends to USCIS for a temporary worker.

So the date that matters is the filing date, not the approval date, and only if a few things are true.

The three things that must be true

The rule calls you an "eligible H-1B nonimmigrant" if all three of these hold (8 CFR 214.2(h)(2)(i)(H)(1)):

  1. You were lawfully admitted in, or otherwise given, H-1B status.
  2. The new employer filed the petition before your authorized stay ran out.
  3. You have not worked without authorization in the U.S. from your last admission up to the filing of the new petition.

If any one of these fails, portability doesn't cover you. USCIS's I-9 page puts it simply: if you aren't in H-1B status right now, you can't change employers or start working until USCIS approves the petition. (USCIS I-9 Central: Temporary (Nonimmigrant) Workers)

What to do, in order

1. Don't resign on a promise. Wait until the new employer tells you the I-129 has actually been filed. USCIS sends the employer a receipt once it takes in the petition. No receipt is sent if a petition is rejected. (USCIS I-9 Central)

2. Check the start date on the petition. If it says a later date than the filing date, the later date is your first allowed workday.

3. Expect a new Form I-9 on day one. The new employer must complete a new I-9 for you. Your unexpired Form I-94 from the previous employer, together with your foreign passport, counts as a List A document. HR writes "AC-21" and the date it submitted the I-129 in the Additional Information field of Section 2. (USCIS M-274, 7.5)

USCIS also suggests the employer keep a copy of the new I-129, proof of payment, and evidence that it mailed the petition with your I-9. (USCIS I-9 Central) If HR asks you for nothing beyond your passport and I-94, that's normal.

4. Keep your own copies. Get the receipt from HR and write down the filing date. You'll want both if anyone asks later why you started before approval.

How long portability lasts

Your work permission under portability lasts until USCIS decides the new petition. (USCIS: H-1B Specialty Occupations; 8 CFR 214.2(h)(2)(i)(H)(2)) Then:

  • Approved: you stay with the new employer for the dates the approval shows. HR reverifies your I-9 in Supplement B once USCIS decides. (USCIS I-9 Central)
  • Denied: work based on portability stops. You may go back to the previous employer only if your earlier period of authorized employment is still valid. (USCIS: H-1B Specialty Occupations)

So it helps to leave the old job on good terms, at least until the new petition is approved.

What if you move again before the first one is decided?

The rule covers this too. If you're working under portability and your I-94 date has passed, you're still treated as being in a period of authorized stay for this purpose. A third employer can file, and you may start there on filing or on its start date, whichever is later, even though the earlier petition is still pending. (8 CFR 214.2(h)(2)(i)(H)(3))

There's a catch. If the extension or amendment in an earlier petition in the chain is denied, a later one in the chain can't be approved for its extension either, unless your earlier approved H-1B status is still valid. Each extra move adds risk, so talk to an attorney before a second jump.

When it goes wrong

  • The petition was filed after your stay ended. Then condition 2 fails. Check the date on your I-94, not only the date on your old I-797.
  • There was unauthorized work after your last entry. Condition 3 fails, even if it was only a few days.
  • Your current H-1B is cap-exempt (for example, at a university) and the new job isn't. USCIS says that petition is subject to the H-1B cap, and the new employer must register first, usually in March. (USCIS: H-1B Specialty Occupations)
  • You lost the old job before the new filing. USCIS describes a grace period of up to 60 consecutive days, or until your authorized validity ends if that's sooner, to find new work, change status or leave. (USCIS: H-1B Specialty Occupations)
  • You travel or the request is found ineligible. USCIS's H-1B page says a September 2025 Proclamation payment doesn't apply to a petition for someone inside the U.S. asking for an amendment, change of status or extension of stay when that request is granted. It can apply if USCIS finds the person ineligible, for example if they leave the U.S. before the decision. (USCIS: H-1B Specialty Occupations) Ask the attorney before any trip abroad while the petition is pending.

What to ask before your last day

Ask the new employer or its attorney:

  1. Has the I-129 been filed, and on what date?
  2. What start date does the petition request?
  3. Does my I-94 show that my stay was still valid on the filing date?
  4. Was my last H-1B cap-subject, or cap-exempt?
  5. If the petition is denied, what's the plan?

And ask yourself one thing: is my old job's approval still valid in case I need to go back?

This post is about changing employers. If you're staying with the same employer and your extension is pending past your end date, that's a different rule, the 240-day rule, and we cover it in a separate post.

CloudSkill Consulting LLC sponsors H-1B petitions for qualified candidates in some roles. Questions about our roles go to info@cloudskillconsulting.com.

Plan with this, decide with your papers: this summary from CloudSkill Consulting LLC isn't legal advice. The attorney who files your H-1B can tell you how the rules fit your case. Keep the USCIS and eCFR pages below open when you talk.

Sources

Every page below was read on Nov. 4, 2026.

CloudSkill Consulting LLC helps teams with fixed-fee cloud projects, FinOps reviews and IT staffing. Learn more at cloudskillconsulting.com.