When your taxes are not paid the IRS establishes a lien against all of your assets (especially real estate). This gives the IRS the legal right to collect taxes from the sale of your assets, which includes just about everything you own.
The lien can be against you, your spouse, or your company. A lien against your company would seize your accounts receivables. Liens filed against you by the IRS also show up on your credit report and often prevent you from opening a checking account or borrowing against any assets, like your home. With a Federal Tax lien on your record you can't get a reasonable loan to purchase a car.
Levies can also do a lot of damage in your life and is the IRS's way of getting your immediate attention. What they are saying is, we have tried to communicate with you but you have ignored us. Levies are used to seize your wages and whatever other assets you have. If you own it, they can take it. That includes checking accounts, auto's, stocks, bonds, boats, paychecks, and even Social Security checks!
We are often able to get those levies released and help you get out of this terrible situation. Our goal is to get you even with the IRS, with what you can afford, and let you start life anew.