Say you're paying 6% -- fixed for 10 years -- on that eye-watering million-dollar loan. This allows you to deduct $60,000 from your taxable earnings, thus saving about $20,000 a year in the 33% tax bracket. In a decade's time, that's a potential saving of $200,000. Throw in another $30,000 of savings from your property tax deduction; the $200,000 you'd be theoretically saving over the same period on the difference between a pre-crunch 6% rate and, say, the 8% rate you might be offered now; and the $700,000 of equity you'll potentially end up with after inflation's gone to work on both your loan and the value of your home: Net result? The penalty for having bought at the height of the worst real estate bubble in history adds up to a potential $1.1 million gain.
