$700k house, 5 year fix rate 3.7% mortgage, 30 years amortazation. 20% down ($140k). total loan $560k
Year End 1 - Bal. $546,064; Princ. $13,935; Int. $20,329
28,000 - 20,000 = 8,000 (don't count in the principle payment

)
5.7% return on $140k for first year. even for 5 month vacancy