Internal Revenue Service (IRS) still allows home owners to deduct mortgage interest on tax return. To qualify for the tax deduction, the home must be first or second home, the debt must be secured, the purchase price must not exceed $1,000,000, and the home loans equity must not exceed $100,000.

For an Interest Only Mortgage, you do not need to calculate. The whole amount is tax deduction. This article is useful for regular mortgage payment in which you need to calculate the mortgage interest tax deduction yearly. To avoid mistake, you can use the value on form 1098 which is sent by the lender every year. However, you might consider verify the accuracy of form 1098. Thus, you need to know how to calculate mortgage interest tax deduction.

The home owner pays off the principal for every mortgage payment. Therefore, the mortgage interest tax deduction changes every year. For example, the home owner purchases a home for $250,000 principal, 30 years, and 6.5% interest. The monthly mortgage payment $1,580.17. The interest on the first payment equals $1352.50 ($250,000 principal x (6.5 % interest / 100 / 12 periods)). Thereby, you add the interest for each payment in the year. The principal is different every payment. For example, the next principal equals $249, 772.33 ($250,000 principal - 1580.17 mortgage payment + [$250,000 principal x (6.5 % interest / 100 / 12 periods)] ). This translates to $16,167.13 mortgage interest tax deduction for the first year.

It is advisable to check with Tax Advisor and IRS with the current tax regulations and laws. The tax regulations and laws may change yearly.