A fixed-rate mortgage means the interest rate and the payments remain the same for the entire life of the loan (taxes, of course, may change.) Advantages include consistent principal and interest payments, making this loan stable. In other words, your rate won't change, so you don't need to worry about market fluctuations.
Disadvantages include a possibly higher cost. These loans are usually priced higher than an adjustable-rate mortgage. Keep in mind that, on average, most people move or refinance within seven years. If rates in the current market are high, you're likely to get a better price with an adjustable-rate loan.
With ARMs:
ARMs are usually priced lower than fixed-rate mortgages so you can increase your buying power and lower your initial monthly payments. If interest rates go down, you'll enjoy lower payments. Usually an ARM is the best choice for homeowners who plan to relocate (for example, with their company or the military), or for those who are purchasing their first home and plan to be in the property only for three to five years. Remember that, on average, most people move or refinance within seven years.
Conversely, monthly payments could increase if monthly payments if interest rates go up. Keep in mind that ARMs are best for homeowners who aren't planning on staying with a property for a long period. If you're on a fixed income, an ARM (especially a short-term ARM) may not be your best choice.
10/1 Adjustable-Rate Mortgages provide a fixed initial rate of the loan for the first ten years of repayment. After 10 years, the rate adjusts every year thereafter for the remaining life of the loan. The loan is amortized over 30 years.
7/1 Adjustable-Rate Mortgages offer an initial rate that is fixed for the first seven years of repayment, then the rate adjusts every year thereafter for the remaining life of the loan.
5/1 Adjustable-Rate Mortgages mean the initial rate remains fixed for the first five years of repayment, and then adjusts every year thereafter.
3/1 Adjustable-Rate Mortgages provide three years at the initial fixed-rate, then the rate adjusts every year for the remaining life of the loan. A good choice if you expect to move or refinance in a relatively short period of time. But a much shorter fixed-rate period means your interest rate (and therefore monthly payments) may begin to fluctuate after three years.