$9,877 = Mortgage interest paid (a loan of $150,000 for 30 years, at 7 percent, using year-five interest)
$2,700 = Property taxes (at 1.5 percent on $180,000 assessed value)
$12,577 = Total deduction
Then, multiply your total deduction by your tax rate.
For example, at a 28 percent tax rate: 12,577 x 0.28 = $3,521.56
$3,521.56 = Amount you have lowered your federal income tax (at 28 percent tax rate)
Note: Mortgage interest may not be deductible on loans over $1.1 million. In addition, deductions are decreased when total income reaches a certain level. In addition, the tax law can change overnight.