Garnishing Social Security for back federal taxes

The IRS can assess up to 15percent of your social security benefit to collect past due tax bills less than 10 years old. For example, if you owed $450 in taxes and your monthly benefit is $1000, the IRS could deduct $150 directly from your social security check each month for 3 months.
The 750 dollar cap is on other Federal debts,such as
student loans,home loans done thru the federal government.They can take 50 to 65 percent out for child support.

Dodger,

As per as non-tax debt collection is concerned, garnishment is not possible unless you receive more than $750 from Social Benefits.

But no such limit is set for tax collection. Government can garnish 15% of your benefit as long as the tax is not paid off.

What if the back taxes owed are over 10 years old?

Wages are garnished from the disposable earnings after setting aside the required deductions. These deductions include federal, state, and local taxes, the employee's share of State Unemployment Insurance and Social Security

I do belive that the IRS is barred from collecting taxes assessed more than 10 years ago,but if they have an active court case against you filed before the 10 years was up,they can still collect.

got hr block toi fill out taxes and said we owed a federal tax i do not know how. IRS says I owe it.

Pudge, do not keep your federal taxes owed for a long period. There are huge penalties for defaulting on it. If you have any queries, contact the IRS department and make the payments. This will be good for your credit ratings. Take the advice of an attorney.