Income Risks: There are no assurances that your income will rise fast enough to cover the higher monthly mortgage payments.
Property Risks: Instead of the property rising fast enough to pay off your interest only home mortgage, it could stay at current levels or even drop. As a result, you might require another loan just settle the interest only mortgage loans.
No guarantee of getting superior returns in other investments: If you used the money to generate returns in investments such as equities and mutual funds, there is no guarantee you’ll make money.