You are required to report self-employment income on schedule C whether you get a 1099 or not, using your own accurate financial records. You report your gross income, deduct expenses, and pay self-employment tax and income tax on the net profit, plus income tax on the wages from your regular job.
For turbotax online, you must use the self-employment version (formerly called Home & Business). If you buy turbotax to install on your own computer,, all versions include schedule C (I recommend Deluxe for other reasons) while the Home & Business version has more assistance that may be useful if you are a newcomer.
