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Buying a more expensive house as a tax shelter (larger interest deduction)?
Two points You don't really get the full 10,000 annual interest as tax free income.  Well you do, but you would have gotten a substantial amount of that anyway as the standard deduction. ...From the IRS.... Standard deduction The standard deduction for married couples filing a joint return is at $11,900 for 2012. The standard deduction for single individuals and married couples filing separate returns is $5,950 for 2012. The standard deduction for heads of household increases by $50 to $8,700 for 2012. so If you were married it wouldn't even make sense to claim the 10,000 mortgage interest deduction as the standard one is larger. It can make sense to do what you are talking about, but ultimately you have to decide what the effective interest rate on your mortgage is and if you can afford it. For instance.  I might have a 5% mortgage.  If I am in a 20% tax bracket it effectively is a 4% mortgage to me.  Even though I am saving tax money I am still paying effectively 4%.  Ultimately the variables are too complex to generalize any hard and fast rules, but it often times does make sense. (You should also be aware that there has been some talk of eliminating or phasing out the mortgage interest deduction as a way to close the deficit and reduce the debt.)