Short term mortgages are able to be paid off much faster. They have much lower interest rates and equity can be built up very quickly. Because the interest rate is low you will pay less over the long term when compared to a long term mortgage. At the same time, your purchasing power will be low and you will not have many tax benefits. Short term mortgage loans are also hard to get approved for. These loans tend to have higher monthly payments. Whether you decide to get a short term loan or a long term one, you will be able to refinance to change the length of the mortgage. If you decide a few years after setting up a 30 year mortgage that you earn enough to pay it off much faster, you can refinance the mortgage for a shorter length of time. If you have a short term loan and it is difficult to make the monthly payments, you can refinance it to a 30 year mortgage.