I don't believe that you have any additional extensions for 2010 because all filing periods expired in 2011. You may also be subject to additinal penalties and interest if you do not file immediately your returns.
I am not sure what info from the IRS your are seeking, so you need to be more specific. You can always check your bank deposits to determine what income the entity received if you are depositing all income.
Phillip M. Smith Jr.
Los Angeles Tax & Business Attorney
Licensed before the United States Tax Court
THESE COMMENTS ARE NOT LEGAL ADVICE. They are provided for informational purposes only. Actual legal advice can only be provided after consultation by an attorney licensed in your jurisdiction. The answer to question does not create an attorney-client relationship or otherwise require further consultation. Mr. Smith is licensed to practice law throughout the state of California with offices in Los Angeles County. He is authorized to handle IRS matters throughout the United States, and is also licensed to practice before the United States Tax Court. His phone number is 323-292-4116 or his email address is firstname.lastname@example.org.
File Form 4506-T (check box 8) with the IRS. Hopefully, you deposited your receipts into a bank account and, as Mr. Smith suggests, you can analyze your deposits into the account to aid you in determining your income. And, yes, get that return filed as quickly as possible.
You should get the info. back from the accountant or give them a time limit on completing the work.
You can also request a tax transcript of any income that is reported to each corp. You will have to prove that you are authorized to represent the corporation in order to get the info. though. You will also need the tax id no. to give to the IRS when you contact them.
You may be able to get the information you need from the IRS account transcript office. 866-860-4259. They will have documentation of all income reported to the IRS by all entities.