They have the software, but they only have some of the numbers. Your tax return includes all those that might not be reported. For example of you are doing sm

They have the software, but they only have some of the numbers. Your tax return includes all those that might not be reported. For example of you are doing small non w2 jobs on the side that you haven't received a 1099 for, the IRS had no way of knowing about those without an audit.