Form 941X

Any idea how to file 941x after acquisition.  Acquisition caused new EIN, so how to apply for credits with old EIN?

Thanks!

You need to know if that is a qualified predecessor-successor merger or acquisition.

Have you used the IRS resources?

https://www.irs.gov/newsroom/faqs-employee-retention-credit-under-the-cares-act

https://www.irs.gov/instructions/i941sd

https://www.irs.gov/pub/irs-pdf/i941.pdf