Only selected non-incorporated vendors require a 1099 form. Go to Expenses > Vendors > Terms tab to set the 1099 vendor options.

Turn the Vendor receives 1099 option ON if this vendor is eligible to receive a 1099.
Contact your accountant or an EBMS consultant for criteria that determine if the vendor is eligible. A vendor does not always receive a 1099 form when the Vendor receives 1099 switch is ON since the payments made to the vendor must equal or exceed threshold amounts for specific General Ledger accounts.
Enter the vendor supplied Tax Identification number for every vendor that is selected to receive a 1099.