A tax lien is not a casual piece of business and you should be worried about it.
Notice of Federal Tax Lien
The IRS will file a "Notice of Federal Tax Lien", that is a
"Levy against personal or real property".
If your personal or business property has been attached with a tax lien your credit rating could suffer.
You have to pay Uncle Sam before you can be unburdened from the lien.
Usually as long as you are making payments or while you are waiting for consideration for an installment agreement
the IRS will not place a lien on your property.
Also:
The IRS will give you a break from enforced collection
for a period of 30 days after a request for an agreement has been rejected (nice of them)
Generally, IRS enforced collection actions are not made while an installment agreement request is being considered.
Uncle Sam usually won't come down on you with a lien for the time while a timely appeal of the rejection or termination is being evaluated by the IRS.
These problems can be overwhelming and it may be well worth your time and money to seek professional help with these sorts of problems before you end up too far over your head.
For more detailed tax information go to www.irs.gov