If you owe the IRS money for prior years, you should have received a notice in the mail stating how much you owe and for what tax year.
You can also use this IRS online link to access your information: https://www.irs.gov/payments/view-your-tax-account
In addition, you can contact the Bureau of the Fiscal Service (BFS) directly at (800) 304-3107 to find out if there is a pending offset of your refund and for how much.
