Please don't ask these questions on a public website. You never know who is reading this. There is a presumption of willfulness if you fail to file returns for 3 or more years. If the IRS or anyone calls and asks you any questions about your taxes, just get their name and telephone number and tell them your representative will call them. You should immediately hire a tax lawyer to represent you and steer this from criminal into a civil only matter. It sounds like you are preparing your returns yourself. That is not a good idea because there is a higher chance of audit for the missed returns.
Please have your tax attorney arrange for a good tax preparer. Also, unless yo pay the tax in full, your 2013 extension will not be valid. You should get the information to your preparer to have the 2013 return filed by April 15.
If you do not like this answer or disagree, please look at one of the other answers provided. It is not necessary for you to try prove this answer is "wrong" or something with which you do not agree. This is a free service for you based on limited facts. Nevertheless, many times you need to consult an attorney with the details to get actual advice specific to your concerns. Do not put too many details in your questions or comments because this makes the information public and could hurt you. Government Regulations contained in IRS Circular 230 regulate written communications about Federal tax matters, including e-mail, between us and our clients. This is another attempt by the government to limit your rights and to extend the control of government over individuals and businesses. Nevertheless, such communications are either opinions or other written communications. This is not an opinion. It is other written communication and was not written to be relied upon, by itself, to avoid any tax penalties. In order to receive assurances of protection from tax penalties from a written communication, you should get an opinion letter. If you would like to discuss an opinion letter relating to any matter, please contact me and I will explain what is involved and what it will cost.
Mr. Cappuccio is correct. I will add that the IRS, absent factors indicating fraud, tax evasion, offshore accounts or large sums, usually does not recommend criminal prosecution provided the taxpayer has made substantial efforts to be fully compliant with the tax code. File your returns, then work out a payment plan. Generally speaking, it is better to be represented in this type of situation.
Your situation is not uncommon, but do not be misled into thinking you can handle it yourself. You are in a fairly serious position, and you have not handled it yourself before. Although you may well indeed file and arrange to pay, it would be foolish to delay consulting with a tax attorney.
This is not intended to be legal advice, and is general in nature.
You should be careful in the filing and consult and attorney prior to.
This answer is based on general legal principles only and is not intended to provide specific legal advice. This answer is for informational purposes only and does not constitute the formation of a lawyer-client relationship. Any reader of this answer should not make decisions based upon in without first directly consulting with an attorney