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.
First, if you file your tax return on or before April 15th, the IRS has three years (normally) from April 15th to audit you.007 return filed on March 10, 2008. 1  Last day for the IRS to assess additional tax: April 15, 2011. 2  If you have omitted more than 25% of your income: April 15, 2014.