What is an I/O payment?

Traditional mortgages require that each month you pay back some of the money you borrowed (the principal) plus the interest on that money. The principal you owe on your mortgage decreases over the term of the loan. In contrast, an I-O payment plan allows you to pay only the interest for a specified number of years. After that, you must repay both the principal and the interest.

Most mortgages that offer an I-O payment plan have adjustable interest rates, which means that the interest rate and monthly payment will change over the term of the loan. The changes may be as often as once a month or as seldom as every 3 to 5 years, depending on the terms of your loan. For example, a 5/1 ARM has a fixed interest rate for the first 5 years; after that, the rate can change once a year (the "1" in 5/1) during the rest of the loan.

The I-O payment period is typically between 3 and 10 years. After that, your monthly payment will increase--even if interest rates stay the same--because you must pay back the principal as well as the interest. For example, if you take out a 30-year mortgage loan with a 5-year I-O payment period, you can pay only interest for 5 years and then both principal and interest over the next 25 years. Because you begin to pay back the principal, your payments increase after year 5.

What is a Payment Option ARM?

A payment-option ARM is an adjustable-rate mortgage that allows you to choose among several payment options each month. The options typically include:

- A traditional payment of principal and interest (which reduces the amount you owe on your mortgage). These payments may be based on a set loan term, such as a 15-, 30-, or 40-year payment schedule.

- An interest-only payment (which does not change the amount you owe on your mortgage).

- A minimum (or limited) payment (which may be less than the amount of interest due that month and may not pay down any principal). If you choose this option, the amount of any interest you do not pay will be added to the principal of the loan, increasing the amount you owe and increasing the interest you will pay.


Interest rates.
The interest rate on a payment-option ARM is typically very low for the first 1 to 3 months (2%, for example). After that, the rate usually rises to a rate closer to that of other mortgage loans. Your monthly payments during the first year are based on the initial low rate, meaning that if you only make the minimum payment, it may not cover the interest due. The unpaid interest is added to the amount you owe on the mortgage, resulting in a higher balance. This is known as negative amortization. Also, as interest rates go up, your payments are likely to go up.

Payment changes.
Many payment-option ARMs limit, or cap, the amount the monthly minimum payment may increase from year to year. For example, if your loan has a payment cap of 7.5%, your monthly payment won't increase more than 7.5% from one year to the next (for example, from $1,000 to $1,075), even if interest rates rise more than 7.5%. Any interest you don't pay because of the payment cap will be added to the balance of your loan.

Payment-option ARMs have a built-in recalculation period, usually every 5 years. At this point, your payment will be recalculated (lenders use the term recast) based on the remaining term of the loan. If you have a 30-year loan and you are at the end of year 5, your payment will be recalculated for the remaining 25 years. The payment cap does not apply to this adjustment. If your loan balance has increased, or if interest rates have risen faster than your payments, your payments could go up a lot.

Ending the option payments.
Lenders end the option payments if the amount of principal you owe grows beyond a set limit, say 110% or 125% of your original mortgage amount. For example, suppose you made minimum payments on your $180,000 mortgage and had negative amortization. If the balance grew to $225,000 (125% of $180,000), the option payments would end. Your loan would be recalculated and you would pay back principal and interest based on the remaining term of your loan. It is likely that your payments would go up significantly.



What are the risks associated with I/O payments and Payment Option ARM's?


Rising monthly payments and payment shock.
It is risky to focus only on your ability to make I-O or minimum payments, because you will eventually have to pay all of the interest and some of the principal each month. When that happens, the payment could increase a lot, leading to payment shock. In the worksheet example, the monthly minimum payment on the option-ARM payment rises from $630 in the first year to $1,308 in year 6, assuming the interest rate stays at 6.4%. The monthly payment could go up to $2,419 if interest rates reach the overall interest rate cap.

Negative amortization.
If you have a payment-option ARM and make only minimum payments that do not include all of the interest due, the unpaid interest is added to the principal on your mortgage, and you will owe more than you originally borrowed. And if your loan balance grows to the contract limit, your monthly payments would go up. For example, if your $180,000 loan grew to $225,000 (125% of 180,000), your payments would be recalculated.

Refinancing your mortgage.
You may be able to avoid payment shock and higher monthly payments by refinancing your mortgage. But no one knows what interest rates will be in 3, 5, or 10 years. And if your loan balance is greater than the value of your home, you may not be able to refinance.

Prepayment penalties.
Some mortgages, including I-O mortgages and payment-option ARMs, have prepayment penalties. So if you refinance your loan during the prepayment penalty period, you could owe additional fees or a penalty. In the Mortgage Shopping Worksheet example, the penalty is 3% in the first year, 2% in the second year, and 1% in the third year. In this case, you could owe $3,600 if you refinance in year 2. Most mortgages let you make extra, additional principal payments with your monthly payment. This is not considered "prepayment," and there usually is no penalty for these extra amounts.

Falling housing prices.
If housing prices fall, your home may not be worth as much as you owe on the mortgage. Even if home prices stay the same, if you have negative amortization, you may owe more on your mortgage than you could get from selling your home. Also, you may find it difficult to refinance. And if you decide to sell, you may owe the lender more than the amount you receive from the buyer.



What are the important target dates for an I/O payment or Payment Option ARM?


Introductory period.
Many option ARMs have a 1-month or 3-month introductory period at the beginning of the loan. During this period, lenders use a lower interest rate to calculate your payments. For some I-O mortgage payment loans, this introductory period lasts 1, 3, or 5 years.

Interest rate adjustment period.
Most payment-option ARMs have interest rates that adjust monthly after the introductory period. You could find that the interest you owe increases even though your minimum payment stays the same each month, adding to your negative amortization. Typical interest rate adjustment periods for an I-O mortgage are monthly, every 6 months, or once a year.

Payment adjustments.
Most I-O payment mortgages and payment-option ARMs have payments that adjust once a year. In addition, most of the adjustments on payment-option ARMs are limited by a payment cap, usually 7.5%. Keep in mind that payment caps do not apply when your loan is recalculated at the normal recalculation period. Payment caps also do not apply if your balance grows beyond 110% or 125% of your original mortgage amount.

Recalculation period. With a payment-option ARM, your loan will be recalculated, or recast. The recalculation period is usually 5 years, but it can vary depending on the terms of your loan. When your loan is recalculated, the 7.5% payment cap does not apply, so you could see a large change in your monthly payment. After your loan is recalculated, you will still have the option to make a minimum payment. I-O loans are recalculated at the end of the option period (usually 3, 5, or 10 years); after that you will pay back both the principal and interest for the remaining term of the loan.



Mortgage Payment Examples


Compare the differences over 5 years in the monthly payment of 5 different mortgage loans, all with the original loan amount of $180,000.

Traditional fixed-rate mortgage--The monthly payment stays at $1,161 over the life of the loan.

5/1 traditional ARM--The monthly payment stays at $1,126 for 5 years but then changes with the interest rate. In the example, the monthly payment would be $1,344 if interest rates rose 2% in year 6. A 5/1 ARM is an ARM in which the rate is fixed for the first 5 years and then may adjust every year during the remainder of the loan term.

Fixed-rate 5-year interest-only mortgage--The monthly payment stays at $1,035 for the first 5 years and then increases to $1,261 in year 6 as you begin to pay down the principal.

5/1 interest-only ARM--The monthly payment stays at $960 for 5 years but increases to $1,204 in year 6. The payment rises because interest rates are rising and because you did not pay down the principal during the first 5 years. If interest rates rose 2%, the monthly payment in year 6 would be $1,437.

Payment-option ARM with minimum monthly payment--The minimum monthly payment starts at $630, but this amount does not cover all of the interest ($957). The payment rises 7.5% each year (payments are $677 in year 2, $728 in year 3, $783 in year 4, and $842 in year 5). The loan is recast at the beginning of year 6. If interest rates stay the same, the monthly payment would be $1,308. If interest rates go up 2%, the monthly payment would be $1,562.

If you choose the minimum-payment option ARM to lower your monthly payment to $630 because you cannot afford higher monthly payments, will you be able to afford the monthly payments in the future? Before taking an I-O mortgage or a payment-option ARM, think about not only how you will make the initial payments but also whether you can make the payments in the years ahead.