Mortgage interest you pay on loans up to $1 million ($500,000 Married Filing Separately) is tax deductible, provided you used the money to buy, build or improve your home and the loan is secured by your home.

The interest you pay on loans secured by your home and used for a purpose other than to buy, build or improve your home is tax deductible for loans up to $100,000 ($50,000 Married Filing Separately). The limit may be reduced depending on the market value of the home at the time you take out the loan. Use equity lines of credit wisely. If you fail to make the payments, you put your home at risk.

If your income meets the requirements and your state or local government issued you a mortgage certificate credit, you may be eligible to claim a tax credit (the mortgage interest tax credit) based on the amount of interest you paid. If you claim the tax credit, you must reduce your interest tax deduction by the amount of the credit.