Why you should file your past due return now?
Avoid Tax Problems, File Your Tax Returns.
File your past due return and pay now to limit interest charges and late payment penalties.
Claim a refund:
You risk losing your refund if you don’t file your return. If you are due a refund from withholding or estimated taxes, you must file your return to claim it within 3 years of the return due date. The same rule applies to a right to claim tax credits such as the Earned Income Credit.
What if you don’t file voluntarily:
If you fail to file, IRS may file a substitute return for you. This return might not give you credit for deductions and exemptions you may be entitled to receive.
If the IRS files a substitute return, it is still in your best interest to file your own tax return to take advantage of any exemptions, credits and deductions you are entitled to receive. The IRS will generally adjust your account to reflect the correct figures.