Prior to the IRS moving forward with a wage garnishment they must meet the three conditions discussed under levies. Your employer is responsible for forwarding the wages that have been garnished to the IRS, therefore, there is no way to avoid the wage garnishment.
The amount that the IRS can take through a wage garnishment is calculated by using a formula which includes your standard deduction and the number of deductions you can claim. Depending on your individual circumstances this can result in as much as 70% of the your wages going to the IRS.
The wage garnishment will not stop until the tax debt is paid in full, the IRS agrees to release the wage garnishment, or the Statute of Limitations on collections expires.