As an example, suppose you borrow $150,000 at five percent interest. You would pay approximately $7,500 in interest in the first 12 months of your mortgage. With a 30 percent MCC, for example, you could reduce your federal income tax liability by $2,000 for that year, allowing you to reduce your tax withholding by $166 a month.
Over the first 10 years of ownership, depending on the amount you borrow for your home, you could save $20,000 in federal taxes. Like many homeowners, you can also claim an interest deduction on the remaining interest you pay.