Basic I 485 based EAD question

[realhyd 0]

I am trying to figure out if my EAD based on I 485 AOS will be automatically extended when it is up for renewal, assuming that I submit a properly filled I 765 application

Please let me know.

[newacct 0]

Yes, category C09 EADs (EADs based on pending I-485) qualify for automatic extension of work authorization. So you are authorized to work until 540 days after your EAD expiration, as long as you apply for renewal (which is free) before your EAD expires. You will need to show the renewal filing receipt plus your expired EAD to your employer for the I-9. See this page from USCIS and this page from the Handbook for Employers.