Qualifying for the Mortgage Interest Deduction. Mortgage interest includes that which you pay on loans to buy a home, on home equity lines of credit and on construction loans. The deduction is limited to interest paid on your main home and/or a second home. Interest paid on a third or fourth homes isn't deductible.
The statute of limitations on how far back the IRS can audit (called the Assessment Statute Expiration Date or ASED) varies depending upon the circumstances of the tax return. In most cases the IRS will not go back more than 3 years unless there is something very wrong with the tax return that was filed.
Returns Filed Accurately and On Time. If you filed your personal tax return on time, and if your return was accurate, the IRS has three years from the due date to initiate an audit. The due date of a personal return is generally April 15 of the following year, unless that date falls on a weekend or holiday.raudulent or Unfiled Returns. If you file a fraudulent tax return, the IRS can initiate an audit at any time, with no limitations. Similarly, if you fail to file your tax return, there is no time limit on an examination.