The iRS is garnishing your actual paychecks that you receive at work? Or do you mean they seize/offset your income tax refund? Do you owe back taxes, child support or student loan debt?
https://www.irs.gov/uac/tax-refund-offsets-pay-unpaid-debts
IRS Treasury Offset Program Call Center at 1-800-304-3107
To see back taxes owed
https://www.irs.gov/uac/view-your-tax-account
https://turbotax.intuit.com/tax-tips/tax-payments/who-can-garnish-an-income-tax-refund/L7cPPzDyc
You could seek help from a Tax Advocate:
https://www.irs.gov/advocate
**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.**
