Navy Federal 5/5 ARM: Rate Caps, Resets, and Who Qualifies

The Navy Federal 5/5 ARM is a 30-year adjustable-rate mortgage that locks your interest rate for the first five years and then resets it once every five years for the rest of the term. As of early 2026, the starting rate is as low as 5.375% with an APR of 5.808%, and Navy Federal does not require private mortgage insurance regardless of your down payment.¹ The long gap between adjustments is the point of the product. Most ARMs reset every year after the initial fixed period; this one gives you a five-year runway each time.

What the 5/5 Structure Actually Means

The first “5” is your fixed period. For sixty months after closing, your principal-and-interest payment does not change, and you can budget with the same certainty a fixed-rate borrower has.¹

The second “5” is how often the rate can move afterward. On a 30-year loan, potential adjustments arrive at years 5, 10, 15, 20, and 25. Five resets over three decades.² A 5/1 ARM, by contrast, would recalculate every single year once the initial lock ends.

How Your Rate Gets Recalculated

Each adjustment is built from two pieces: an index and a margin.

The index is the weekly average yield on U.S. Treasury securities adjusted to a constant maturity of five years, published by the Treasury Department and available for anyone to track. If the index is ever discontinued, Navy Federal chooses a comparable replacement.²

The margin is a fixed number of percentage points that Navy Federal adds on top of the index. It’s set at closing and does not change for the life of the loan. Your new rate equals the index plus your margin, rounded down to the nearest one-eighth of a percent.² The rounding-down convention nudges every adjustment slightly in your favor. Your specific margin is stated in your loan agreement, and it is worth comparing between lenders when you shop.³

The Caps That Limit How Far Your Rate Can Move

Navy Federal’s 5/5 ARM uses a 2/2/5 cap structure. Three separate limits control how much your rate can swing.

Caps run in both directions. If market rates fall, your rate can drop by up to 2 percentage points at each reset and up to 5 points below your starting rate over the life of the loan. That’s easy to forget when you’re focused on the upside risk, but a falling-rate environment can lower your payment without you doing anything.

What the Worst Case Looks Like in Dollars

Navy Federal’s disclosure runs the math on a $10,000 loan starting at 5.625%. The monthly payment begins at $57.57. If the rate reaches the lifetime maximum of 10.625%, the payment climbs to $84.67 after year fifteen. Roughly a 47% increase.² Scale that up to a real loan balance and run the number for your own before signing.

Features That Change the Math

Several things about this ARM affect the total cost in ways the headline rate doesn’t show.

No PMI. Most lenders require private mortgage insurance on loans with less than 20% down. Navy Federal waives it on its ARMs entirely. On a $400,000 loan, PMI might otherwise run $100 to $200 per month depending on your credit profile.¹

No down payment on primary residences. Navy Federal offers no-down-payment options for its ARM products on a primary home. With a non-occupant co-borrower, the loan-to-value ratio can go up to 90%.¹ Combining zero down with no PMI is unusual in the market.

No prepayment penalty. You can pay off the loan early, make extra principal payments, or refinance into a fixed-rate mortgage at any time without a charge.¹ That matters because many ARM borrowers plan to refinance before a reset hits.

Same rate on conforming and jumbo. In most areas, mortgages above $832,750 are jumbo loans in 2026.⁵ Navy Federal prices both its conforming and jumbo 5/5 ARMs at the same 5.375% starting rate, where jumbo ARMs at other lenders often carry a premium.⁶

Points already baked in. The advertised ARM rates include 0.250 discount points. In other words, the “as low as” figure assumes you’re buying a quarter of a point at closing.⁶ Ask for the rate without points if you want a like-for-like comparison with other lenders.⁷

The advertised rates also assume a 720 FICO score and 30% down; your actual rate depends on your credit and down payment.⁶

Who Can Apply

You have to be a Navy Federal member to get any of its mortgages. Eligibility is broader than many people realize:

Active-duty servicemembers across every branch, including the Army, Marine Corps, Navy, Air Force, Coast Guard, National Guard, and Space Force, plus veterans, retirees, and annuitants.
Department of Defense civilian employees, U.S. government employees assigned to DoD installations, and DoD contractors working at government installations.
Parents, grandparents, spouses, siblings, children (including adopted and stepchildren), grandchildren, and household members of anyone already eligible.⁸

If a sibling or grandparent served, you can likely join without any personal military connection of your own.

When a 5/5 ARM Fits, and When It Doesn’t

The loan is a strong fit if you expect to sell or relocate within five to ten years. You capture the lower initial rate and either never face an adjustment or face just one. Military families who move on PCS orders every few years fall into this pattern naturally.

It also fits if you think rates will fall over the next several years. Adjustments run both ways, and the rate can drop by up to 2 percentage points at each reset without you refinancing.

If cash flow today matters more than long-term certainty, the lower starting rate combined with no PMI frees money for retirement contributions, higher-interest debt, or anything else.

It’s a weaker fit if you plan to stay in the home for 20-plus years and don’t intend to refinance, or if your budget can’t absorb a 2-point rate jump every five years. Price out the worst-case lifetime cap before you commit and make sure the payment at that ceiling is one you can still make.

What Happens at Each Reset

At each five-year adjustment, Navy Federal takes the current 5-year Treasury index, adds your margin, rounds down to the nearest eighth of a percent, and applies the cap limits. The new payment is calculated using that adjusted rate, your remaining balance, and the remaining loan term. Because you’ve been paying down principal for five years, the balance going into each reset is lower, which softens the impact of a rate increase. The new payment then holds for the next five years until the following reset.

1
Navy Federal Credit Union. Adjustable-Rate Mortgage Loans (ARMs)
2
Navy Federal Credit Union. Initial Adjustable Rate Mortgage (ARM) Loan Disclosure Notice and Consumer Handbook on Adjustable Rate Mortgages (CHARM) Booklet
3
Consumer Financial Protection Bureau. For an Adjustable-Rate Mortgage (ARM), What Are the Index and Margin, and How Do They Work?
4
Consumer Financial Protection Bureau. What Are Rate Caps With an Adjustable-Rate Mortgage (ARM), and How Do They Work?
5
Federal Housing Finance Agency. FHFA Announces Conforming Loan Limit Values for 2026
6
Navy Federal Credit Union. Current Mortgage Rates and Options
7
Navy Federal Credit Union. How Do Mortgage Points Work
8
Navy Federal Credit Union. Membership Eligibility