There is a potential solution to your tax problem. And I would be available to discuss this "exit strategy" with you.

If you qualify, you should pursue, ASAP, an Offer-in-Compromise.

Search Google for a tax attorney who handles IRS/State tax resolution matters.

How can someone fix not filing taxes for years

Non-filing is a very serious IRS problem. However, there are exit strategies. You need to retain, ASAP, a tax attorney familiar with the rules of...

How can I remove a lien with the irs?

Do not ignore these IRS collection notices; you are at risk of IRS levies! You need to pursue, ASAP, a "Collection Alternative" (e.g., another...

Can the irs take your 401k if you take it out and owe taxes ?

You should be pursuing a collection alternative (e.g., an Offer-in-Compromise) and then you would not have to worry about IRS levies.

Quick tax question regarding back taxes

You should be pursuing an Offer-in-Compromise rather than CNC status.

IRS Debt/Payment Plan/Offer in Compromise

If you qualify for an Offer-in-Compromise, the "Gold Standard," then you should pursue an Offer rather an Installment Agreement.

Yes. And you should challenge this action, ASAP, via an Offer-in-Compromise.

If you meet the filing requirements, you must file. Non-filing is not an option.