Most H1B workers do everything right at the start. They go through the lottery, they get selected, their employer files the petition, USCIS approves it, and they start their job. Then, somewhere in the months and years that follow, small oversights begin to accumulate. A changed worksite that nobody reported. A pay stub period where salary dropped below the LCA wage. An expired I-797 that the employer forgot to file an extension for. None of these feel catastrophic in the moment. Some workers do not even realize they happened. But in 2026, with USCIS conducting more site visits than at any point since 2019 and enforcement agencies coordinating more closely than before, the consequences of these H1B mistakes have become significantly more serious.
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This guide covers the most common mistakes H1B workers make — not in the application stage, but during the years they are actually living and working in the US on H1B status. This is not legal advice. Always consult a licensed immigration attorney when questions arise about your specific situation.
Mistake 1: Not Knowing Your Own I-94 Expiration Date
This sounds almost too simple to be worth mentioning. Surprisingly, it is one of the most common issues immigration attorneys encounter. A large number of H1B workers do not know the exact date their authorized stay ends. They know roughly when their I-797 expires, but they have never checked whether their I-94 matches it.
Here is why this matters. Your I-94 record — the electronic record CBP creates each time you enter the US — governs your authorized period of stay. Occasionally, CBP enters an incorrect date. This happens more than people realize. If your I-797 says your status is valid through September 30, 2027, but your I-94 says April 15, 2026, your authorized stay ends in April. Staying beyond that date means you are accruing unlawful presence even though your I-797 says otherwise. The I-94 is what controls.
Go to i94.cbp.dhs.gov right now and download your most recent record. Check the date. Check that the visa class says H-1B. Do this today and then again after every single international trip you take. It takes three minutes and it could save you from a problem that takes months and thousands of dollars to fix.
Mistake 2: Working Remotely From a Different City Without Telling Your Employer
Remote work has become completely normalized. Many H1B workers move cities, work from home states different from their LCA worksite, and give it no thought at all. Unfortunately, this is one of the most common H1B compliance violations in 2026 and one that USCIS is specifically targeting in site visits.
Your H1B petition is tied to the worksite listed on your Labor Condition Application. If you regularly work from a different metropolitan statistical area than what is listed on your LCA, your employer may need to file a new LCA for that location and possibly an amended H1B petition. The rule is triggered by the geographic area, not just the address. Moving from downtown Dallas to a Dallas suburb is generally fine. Moving from Dallas to Austin, or from New York City to New Jersey, may require a new LCA.
In practice, many employers file amended LCAs for new worksites without any issue. The problem is when nobody files anything because nobody thought to ask. Your employer’s immigration attorney should be informed any time you permanently relocate or begin regularly working from a new location. A brief email flagging the change is all it takes on your end. Staying silent is what creates the problem.
What USCIS Is Looking For in Site Visits
Since September 2025, USCIS has dramatically increased the frequency of site visits to H1B worksites. Officers verify three things above everything else: that the employee is performing the duties described in the petition, that they are working at the location listed on the LCA, and that they are being paid the wage listed on the LCA. A remote worker who is physically located three states away from the approved worksite presents all three of these as potential issues simultaneously.
Mistake 3: Assuming Your Employer Is Tracking Your Extension Deadline
Nobody cares about your immigration status as much as you do. This is a hard truth but an important one. Large employers managing hundreds of H1B workers sometimes drop the ball on individual extension timelines. A manager changes. A ticket gets lost in an HR system. A fiscal year budget freeze delays the filing. You get so absorbed in your work that you do not realize your I-797 expired two months ago.
As of the day you read this, know your H1B expiration date. Set a personal reminder six months before that date to ask HR about the extension process. Set another reminder at four months. And if you reach three months from expiration with no movement on the extension, escalate it directly. Do not wait for someone else to catch it.
The 240-day rule — which allows you to keep working for up to 240 days after I-797 expiration if your employer filed a timely extension — only protects you if the extension was filed before the expiration date. A late-filed extension means no 240-day protection, no continued work authorization, and the beginning of unlawful presence from the day your status expired. One missed deadline can undo years of clean immigration history.
Mistake 4: Accepting a Salary Below Your LCA Wage During a Slow Period
This one happens most often at smaller companies and IT consulting firms. Business slows down. A client contract ends. The employer, facing cash flow pressure, reduces salaries across the board or simply stops paying workers who are between projects. It might be framed as temporary. It might come with promises of back pay. It is still a violation of your employer’s LCA attestation and it puts your immigration status at risk.
Your employer attested to the DOL under penalty of law that they would pay you the wage on your LCA for the entire duration of your H1B. That obligation does not pause during slow periods. It does not pause when you are on the bench waiting for a new assignment. It does not pause because the company is having a hard quarter. If your employer cannot sustain the LCA wage, the legally correct action is to terminate the H1B employment, notify USCIS, and begin your 60-day grace period — not to quietly reduce your salary below the threshold.
Check your pay stubs against your LCA wage every single month. If there is a discrepancy, raise it with HR immediately and in writing. If the employer does not correct it, consult an immigration attorney about your options. You have more protection in this situation than most workers realize.
Mistake 5: Traveling Internationally Without Checking Your Visa Stamp Expiry
This mistake ends careers, disrupts families, and strands people abroad for months. It happens because workers assume their valid I-797 is enough to get back into the country. It is not. You need both a valid I-797 and a valid H1B visa stamp in your passport to re-enter the United States after international travel.
Many people have not needed a new stamp in years. Their stamp from 2021 or 2022 has long expired, but since they have been working inside the US, it has not mattered. Then they book a trip home, board the flight, and only realize the problem when they are preparing to return. By that point, they are facing consulate appointment backlogs that in some locations extend well into 2027.
Before every international trip, check your passport. Find your most recent H1B visa stamp. Look at the “Until” date in the top right corner. If it has passed, you need a new stamp before you can return to the US. Plan this process at least six months in advance given current appointment availability at US consulates worldwide.
The Change of Status Abandonment Trap
A related travel mistake affects workers who are in the middle of a change of status — for example, transitioning from F-1 OPT to H1B. If you leave the United States while a change of status petition is pending at USCIS, the change of status is automatically abandoned. USCIS considers your departure as a withdrawal of the request, regardless of the reason you left. The underlying petition may still be approved, but it will be approved for consular processing rather than a status change, meaning you need to get a stamp abroad before returning. This is not a minor technicality. It is a firm rule with no exceptions.
Mistake 6: Ignoring USCIS Notices Because You Think Your Employer Handles Everything
Your employer handles the petition process. They do not necessarily receive every piece of correspondence USCIS sends. Some notices — particularly those related to biometrics appointments, site visit scheduling, or individual status queries — go directly to you or to the attorney of record. If you have moved since your last filing and nobody updated your address with USCIS, those notices go to your old address. You never see them. Deadlines pass.
Update your address with USCIS every time you move using Form AR-11. This is a legal requirement for all non-citizens in the US — not just H1B holders — and must be done within 10 days of any address change. Failure to update is itself a technical violation of immigration law, though it is rarely enforced in isolation. More importantly, it ensures that any USCIS correspondence reaches you rather than disappearing into a previous apartment’s mailbox.
Additionally, create a USCIS online account if you have not already. Many notices are now issued electronically and are visible in your online account before the physical mail arrives. Checking your account periodically is a straightforward way to stay on top of any case activity.
Mistake 7: Starting a Side Business or Freelancing Without Legal Guidance
Your H1B authorizes you to work for one specific employer in one specific role. It does not authorize you to work for any other employer, start a business, do freelance consulting, or earn income from any source other than your petitioning employer.
Technically, you can own a business while on H1B — you just cannot work for it or draw a salary from it without a separate work authorization. This is a fine line that many people misunderstand. Passive investment income, rental income, and stock dividends are generally acceptable. Actively managing operations, consulting for clients, writing code for customers, or doing any work that would constitute employment — even unpaid — creates unauthorized employment issues.
If you want to build something on the side while on H1B, talk to an immigration attorney first about how to structure it legally. There are ways to do it correctly. The problem is not the ambition — it is doing it without understanding the boundaries first.
Mistake 8: Not Keeping Personal Copies of All Immigration Documents
Every I-797 you have ever received. Every I-94 record from every entry. Every LCA. Every pay stub going back to your first H1B employer. Every visa stamp in every passport, including expired passports. All of it.
Many workers keep their most recent documents and nothing else. Then a green card application requires evidence of continuous H1B status going back five years. Or an extension RFE asks for W-2 forms from three prior years. Or a consular officer wants to see prior approval notices during a visa stamping interview. Documents that you discarded years ago become urgently necessary.
Keep a dedicated folder — digital and physical — containing every immigration document you have ever received. Store it somewhere you will not accidentally delete or lose it. This practice costs you nothing and has protected countless people during audits, RFE responses, green card applications, and consular interviews.
Frequently Asked Questions
What happens if my employer files my H1B extension late?
If the extension petition is filed after your I-797 expiration date, you lose the protection of the 240-day rule. Your work authorization ends on your I-797 expiration date and you begin accruing unlawful presence from that day. USCIS may excuse late filings in extraordinary circumstances, but this is discretionary and not guaranteed. Preventing a late filing is always better than trying to fix one.
Can I work from home on H1B?
Yes, but only if your home is in the same metropolitan statistical area as the worksite listed on your LCA, or if your employer has filed an additional LCA covering your home location. Working regularly from a city or metro area not covered by your LCA requires your employer to file a new LCA before you begin working from that location.
What should I do if USCIS conducts a site visit at my workplace?
Be cooperative and honest. USCIS site visit officers verify that you are performing the duties in your petition, working at the approved location, and receiving the LCA wage. You are not required to answer questions beyond confirming basic employment facts. Notify your employer’s immigration attorney as soon as a site visit occurs so they can follow up appropriately with any post-visit documentation requests.
Can I freelance or consult on the side while on H1B?
No. Your H1B work authorization is specific to your petitioning employer. Performing work for any other entity — paid or unpaid, formal or informal — constitutes unauthorized employment unless you have separate work authorization covering that activity. Consult an immigration attorney before engaging in any work outside your primary H1B employer.
What is the grace period if I lose my H1B job?
You have up to 60 days after your last day of employment, or until your I-94 expiration date — whichever comes first — to find a new employer and file a transfer, change your status, or depart the US. You cannot work during this grace period. Act immediately from day one of any job loss rather than assuming you have comfortable time.
Final Thoughts
None of the mistakes in this article are exotic or unusual. They are the kinds of things that happen when people are busy, when employers are understaffed, when nobody thinks to ask the right question at the right time. The H1B system rewards people who pay attention and penalizes those who assume everything is being handled automatically.
In 2026, with enforcement more active than it has been in years and the stakes of status violations higher than ever, paying close attention to your own case is not optional. Know your dates. Keep your documents. Ask questions. Build a relationship with an immigration attorney before you need one urgently. The workers who do these things rarely end up in the situations described in this article.
Disclaimer: This article is for general informational purposes only and does not constitute legal advice. Immigration laws and USCIS policies change frequently. Please consult a licensed immigration attorney for advice specific to your situation.