How much does a borrower need to earn if they are buying a $1,250,000 house with 20% down and the interest rate is 6.5% and amortization is 360 months? The real estate taxes are $20,000 annually and the property insurance is $4,000. The borrower has a $1,000 month payment on his boat, his car loans total $1,200 and credit cards are $2,000 per month. The debt-to-earnings ratio (back ratio) is 43%.