Fixed Interest
Unvarying or fixed interest mortgages are just what the name suggests:
You receive an interest rate that stays the same for the life of your loan.
So, that’s pretty straightforward. Why would you pick a more complex adjustable-rate mortgage?
Well, all that interest adds up.
On a $400,000 loan with a 4.5% interest rate over 30 years, you’d end up paying $246,624 on top of the $400,000 loan principal that you’ll have to pay back.
Plus, the bank will front end load your loan so they get their interest cash upfront. Essentially, they’ll force you to pay more interest first, and your actual loan amount later.
In that same mortgage scenario, your monthly payment would be around $1,796. But in the first month, you’ll only pay $629 to your principal and the remaining $1,166 to interest.
Following your mortgage amortization schedule, you’ll begin to pay more towards your loan principal, but it’ll take a while!
The benefit of an unvarying interest rate is that it remains consistent, but you’ll pay a lot to the bank in interest. Adjustable-rate mortgages work a little bit differently…
Adjustable Interest
Adjustable-rate mortgages (ARM) are appealing to some homebuyers because the interest rate is lower than a comparable unvarying-interest loan… at first.
Over time, an adjustable-rate will begin to increase, and then the rate can fluctuate depending on a few factors.
Still, adjustable rates are attractive to many home buyers—the initial payments are generally much lower than a fixed-rate mortgage, allowing for a much larger loan allowance.
ARM Terms to Know
Adjustment Frequency: The given amount of months or years between your interest rate adjustment. Your interest rate could change every month, 3 months, quarter, year, or even a few years depending on the agreement you make with your lender.
Caps: The limit on how much your interest rate can increase at each adjustment period.
Ceiling: The limit that your interest rate can reach during the entire loan term.
Index: Your interest rate adjustment is based on a benchmark. This benchmark might be based on the interest rate of a treasury bill, or it could be based on an index such as the London Interbank Offered Rate (LIBOR), or the Secured Overnight Financing Rate (SOFR).
Margin: When you agree to an ARM, you’ll agree to pay a set margin. Typically, this amount is a couple of percentage points higher than whatever the index is at a given time.
Think of the index and margin as the bread and butter of your adjustable-rate mortgage.
Your interest rate is determined by the index + the margin.
So, your interest rate will be dirt cheap for the first few months, and then it will change depending on the performance of the indexes.
Your lender will use multiple indexes to determine your interest rate. The most common are one-year treasury securities, the Cost of Funds Index, and the prime rate.
Basically, market performance determines your interest rate. And as you probably know already, the economy can and will fluctuate, taking your interest rate with it.
You could be saving thousands for the first few years, but if the indexes see a downturn, your rates could skyrocket.
There are caps and ceilings on how much your interest can increase, however. Generally, your adjustment ceiling will be no more than 5%, and your cap might be 2% for every adjustment period.
Let’s say you start with a 2% interest, adjustable-rate mortgage that will begin to change after 6 years. Those 6 years might be smooth sailing…
But by the time you arrive at year 8 of your mortgage, that interest rate might jump to 6%.
So, it’s nearly impossible to predict how your interest rate might adjust, and you’ll need to keep a careful eye on market indexes to avoid losing thousands.
Still, the benefit of adjustable-rate mortgages is that they can save you a lot of money, especially if you’re not sticking around long. Typically, lenders will notify you in advance of any adjustments and are usually required to help you find other options if you can’t afford your adjusted interest rate.