<prompt> Human: Backstory: Ill keep this short, if you need more info, ask. Im 29. About three years ago I was homeless, and I pulled myself out of it doing under the table work and consulting. I had lost my job in 2008 with the recession and was never able to get another job, things went downhill from there. But things are better now, and thats good. Last year was the first tax return I filed in seven years, and I only filed it to get the low-income credit.I am not used to making enough money in a year that I am required to file a tax return, and as a result I usually file exempt because I need the money now, not later. I have a decent job now Employee under a W-2 and I noticed that I am above that threshold that I will need to file, and I have not been withholding.Im still working on a system for managing my finances, its very difficult building new, better habits, especially when I have a habit of doing everything I can to kite payments and save money to survive that I have built up over six or seven years.I understand this isnt the place for legal advice and I am not interested in discussing that anyway. I will probably need to pay and I need to start putting money away while still paying rent.If you were in my situation, what would you do?EDITS: Clarifications.  <response>: I know someone who adopted a kid from overseas. For some time afterwards, they would constantly find food hidden away by the kid for later. It took years of food security to wear away the kids constant fear that soon she would be unable to get food in the future. Counseling helped too.In your situation, you may be behaving similarly since you had such a terrible period of financial insecurity. Thats ok and a fairly normal reaction. You have the option now to get professional help to work through your issues on this and lead a happier life. So you may want to consider that, especially if you now have health insurance that includes counseling.For your immediate situation, for 2015 taxes, check out this tool from the irs: it will let you determine your tax liability for this year. If you find that you did not withhold enough, you can adjust your withholding with your company payroll or HR department. If that wont be sufficient, then youll at least know what you owe and can start saving for the payment due in April. As for past years, you pay qualify for a refund. Consider getting your details together and filing a tax return for past years as you may get a sufficient refund that way to help cover this years bill. Good luck, coming back from homelessness is tough. Youve made a lot of progress. 