If I owe back taxes will the IRS keep my tax return if I file electronic?

Yes, if you owe back taxes, the IRS can withhold your tax refund to offset your tax debt, regardless of whether you file electronically or by paper. When you file your return, the IRS will apply any refund you are owed toward your outstanding tax liability. It's important to note that this applies to federal tax debts, and similar actions can occur for state taxes as well.