A line can only persist for a valid underlying obligation. If the debt was discharged by an adversary action in the bankruptcy (the way it should be done), then you can do a couple of things. First, you can send copies of the order discharging the tax to the credit bureaus, and ask them to remove the lien from your public information report. Secondly, you can file a suit for summary removal of the lien. as a practical matter, if the Justice Dept. attorney handling the matter wants to be difficult, he can be, and you may have to offer something for the non-existing debt to get an agreed order of removal of the lien. However, for most folks, the removal from credit bureau reports is the goal, and you can get new loans by showing the order discharging the debt.
The federal tax lien survives the bankruptcy even though the underlying debt has been discharged. It continues in full force and effect as to property you owned on the date you filed for bankruptcy (generally exempt property). The lien will expire when the collection statute of limitations expires. To get rid of it sooner you can negotiate with the IRS to pay them something less than the debt to do so-- generally the value of the exempt property
I suggest you hire an attorney familiar with both bankruptcy and tax law to assist you.
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