You must report and pay tax on all your income, even if you don’t get paperwork. If you are self-employed, you are expected to keep accurate records of all of your income and expenses so you can prepare your tax return, even if you don’t get a 1099. You have one schedule C business for all your similar business activities, even if you have more than one customer or client. The only reason to have separate schedule Cs is if your businesses are so different that the expenses, or equipment, or other aspects of the business need to be separated.
When you set up your schedule C business you will list all your income reported on the 1099 and then there is a second link to add other income not reported on a 1099.
