You could request a free wage and income transcript from the IRS to see what income was reported to the IRS by your employers and/or financial institutions. Then compare that to the income you entered on the tax return.
https://www.irs.gov/individuals/get-transcript
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
