I-94 aka Arrival Departure Record is what governs your status in the USA. An expired I-94 can lead to bar from entering USA for 3 to 10 years.See details on "Unlawful Presence".
Beginning 30 April 2013, CBP will roll out electronic version of Form I-94, Arrival Departure Record. We recommended that all visitors print out and keep a paper copy of the Form for their records at all times. There are still important legal issues that remain unsettled, including, the proper training and education of DHS/CBP of its own officers.
Here is a contribution from a member of our community:
FAQs: Moving to India in 2025 on H-1B extension, I-140 portability, and future U.S. opportunities || Extending parent's stay in the U.S. beyond six months on a B-2 visa
Discussion Topics:
FAQ: Converting from B visa to any other status such as H-1B, etc.
FAQs: H-1B visa transfer before arrival into the USA|| Employee paying for green card and H-1B premium costs || Using an old H-1B visa stamp of a different employer
Release Date
Lawful permanent residents may receive temporary evidence of their lawful permanent resident status by mail rather than physically visiting a field office to receive an Alien Documentation, Identification and Telecommunication (ADIT) stamp (also known as an I-551 stamp).
Lawful permanent residents are entitled to evidence of status and may require temporary evidence of their status in the form of an ADIT stamp if:
Parents came to the USA on a B-2 Visa in March 2021. I have requested an I-539 extension in August 2021 due to COVID and they stayed till Jan 2022. Eventually the extension got denied. Is this a problem?
The government will say as one has overstayed their I-94, they will now be subject to section 222(g). If you overstay your I-94 the visa stamp on your passport is automatically canceled, so you have to apply for a new visa. For more details on this issue, visit my author page on The Economic Times.
I was on H-4, and it was valid till Jan 2023. I got my h1b approved via the Change of Status application and it came along with a new I-94 date. My employer is saying that they need some time to onboard me. They are working on finding a suitable project for me and it is going to take some time. Is it ok to defer the joining date and should my employer or I file any application to let USCIS know that I am not starting the job right away?
That is not your problem, they should be really paying you. It is illegal. They cannot keep the employee out of a payroll. Employers cannot stop paying you merely because they don't have a project.