[NMLS SAFE] 17, ARM Caps and the Fully Indexed Rate

Lesson 17 of the free Quibank NMLS SAFE course. Adjustable-rate mortgages. Borrowers treat the rate on an ARM as something the lender decides each year, and it is not — it is one addition and a set of ceilings, both written into the note the day it closes. Here is the addition, and then the ceilings that override it.

General mortgage knowledge is 20% of the SAFE exam — about 23 of the 115 scored questions. ARMs are where this block turns computational. You will not be asked to recognize a definition here; you will be handed four numbers and asked to produce the borrower's rate. Two components.

The index is a moving market measure — it goes up, it goes down, and nobody at the lender controls it. The margin is the lender's fixed markup, written into the note at closing, and it does not change for the life of the loan. One part floats, one part is bolted down. Add them and you have the fully indexed rate.

That is the whole formula. Exam version. Note rate 4.25% in the initial period, margin 2.25%, index at 5.10%. Which statement is correct?

The answer: the fully indexed rate is 7.35%, and the margin stays fixed for the life of the loan while the index moves. 4.25 is the note rate, not the fully indexed rate. 2.85 subtracts the margin instead of adding it. And the margin never adjusts at a change date.

Notice the gap: the borrower pays 4.25 while the fully indexed rate is 7.35. That is a discounted rate, and it is exactly why payment shock has to be discussed with the borrower. Now the ceilings. Caps are three numbers read left to right: initial, periodic, lifetime.

The initial cap limits the very first adjustment, the periodic cap limits every one after that, and the lifetime cap is the loan's absolute ceiling. Then the rule most candidates never learn: the borrower pays the lower of the fully indexed rate and the capped rate. Compute both, take the smaller. Exam version.

A five-one ARM, initial note rate 3.50%, margin 2.75%, caps of two, two, five. At the first adjustment the index is 6.00%. Compute both. Fully indexed rate: six plus two seventy-five is 8.75%.

Capped rate: the start rate plus the initial cap of two points is 5.50%. Take the lower — 5.50%. 8.75 is the trap, the right fully indexed rate with the cap ignored. The rest of the increase is not lost; it can only come at later adjustments, still subject to the 2% periodic and 5% lifetime caps.

One more, and it is the single most missed idea in this topic. The lifetime cap is measured from the original note rate. Not from today's rate — from the rate the loan started at. So a loan that opened at 4% with a lifetime cap of five points has a ceiling of 9%, and that ceiling was fixed at closing.

It does not move up as the rate climbs toward it. Exam version. An ARM originated at 4.00%, caps of five, two, five. The current rate is 9%, and at the next change date the index plus margin equals 11.50%.

What is the highest rate this loan may reach? 9%. It is already at its ceiling, and no fully indexed rate, however high, pushes it past that. 14% is the classic error — adding the lifetime cap to the current rate instead of to the original note rate.

Lock these in. Fully indexed rate equals index plus margin. The index moves; the margin never does. Caps read left to right as initial, periodic, lifetime — and the borrower pays the lower of the fully indexed rate and the capped rate.

And the lifetime cap is measured from the original note rate. Next lesson: the nontraditional and non-QM products — option ARMs, the reverse mortgage, and the home equity line of credit. Practice every one of these free at quibank.com/en/mlo. See you in lesson 18.