Business & farm

 All income must be reported whether you receive the Form 1099 or not.  If you are filing a Schedule C, there is an opportunity to add other income and identify the source, if you are not including it in Gross receipts.  See picture below.  Line 6 will capture that income for you.  Remember, if you include the income in Gross Receipts, line 1, do not add again on line 6.   The IRS will be able to determine that all of the income is reported whether stated separately or not.  Keep records to show how you determined total income.

The IRS can send you a transcript of income for the EIN. You should register for an online account to request a transcript. This link, Transcript Types and Ways to Order Them, provides most of the information you will need to order a transcript. 

 Also, here is a link to IRS Tax Tip-25:  What To Do If You Have Not Received A Form 1099.