The main difference between a 5/6 ARM and a 7/6 ARM is how long the initial interest rate remains fixed. The 5/6 is fixed for five years, while the 7/6 is fixed for seven years.
After that, both adjustable-rate mortgages can adjust every six months.
The decision comes down to how much the additional two fixed years cost and whether you expect to keep the mortgage long enough for them to matter.
5/6 ARM vs. 7/6 ARM Basics
| Feature |
5/6 ARM |
7/6 ARM |
| Initial fixed period |
5 years |
7 years |
| Adjustment frequency afterward |
Every 6 months |
Every 6 months |
| When adjustment risk begins |
After the initial 5-year period |
After the initial 7-year period |
| Index |
Depends on the loan program |
Depends on the loan program |
| Margin |
Set by the loan terms |
Set by the loan terms |
| Rate caps |
Depend on the specific ARM plan |
Depend on the specific ARM plan |
| Main tradeoff |
Earlier adjustment risk |
Two additional fixed years |
If you expect to sell or refinance before the fifth year ends, compare whether the 5/6 provides better enough pricing to justify using an ARM.
If you expect to keep the mortgage into years six and seven, the additional fixed period on the 7/6 becomes more relevant.
How a 5/6 ARM Works
A 5/6 ARM keeps its initial interest rate for approximately the first five years and can adjust every six months afterward.
Once the adjustable period begins, the new rate generally reflects an index plus a margin, subject to the caps in the loan agreement.
The CFPB explains that the index moves with market conditions, while the margin is established by the lender and generally remains fixed after closing.
For Fannie Mae's standard 5/6 ARM, Plan 4927 uses the 30-day average Secured Overnight Financing Rate, or SOFR, as its index.
That specific Fannie Mae plan limits the first rate change to 2 percentage points and later six-month changes to 1 percentage point, with a lifetime increase of up to 5 percentage points above the initial rate.
Those caps apply to that Fannie Mae ARM plan. Do not assume every 5/6 ARM has identical terms.
How a 7/6 ARM Works
A 7/6 ARM delays the adjustable period for another two years.
Its initial rate remains fixed for approximately seven years, followed by potential rate changes every six months.
Fannie Mae's standard 7/6 ARM, Plan 4928, also uses the 30-day average SOFR index.
Its standard cap structure differs from the 5/6 plan. The first adjustment can be limited by a 5-percentage-point cap, while later six-month adjustments are limited to 1 percentage point. The lifetime increase is capped at up to 5 points above the initial rate.
The larger first-adjustment cap is an important distinction. Two loans can both adjust every six months but still expose the borrower to different payment changes when the fixed period first ends.
What Do the Extra Two Fixed Years Cost?
There is no standard pricing difference between a 5/6 and 7/6 ARM.
The actual spread depends on market conditions, lender pricing, loan characteristics and the borrower.
Use the same-day quotes to calculate how much you would pay for the additional fixed period.
Example: Comparing Two $400,000 Loans
Consider two hypothetical 30-year ARM quotes:
| Loan |
Initial Rate |
Approximate Monthly Principal and Interest |
| 5/6 ARM |
6.125% |
$2,430 |
| 7/6 ARM |
6.25% |
$2,463 |
The 7/6 costs about $32 more per month during the initial fixed period.
Over the first five years, that difference totals about $1,946 in additional scheduled principal-and-interest payments.
In exchange, the 7/6 would remain at its initial rate for another two years while the 5/6 enters its adjustable period.
If you sell or refinance before the 5/6 reaches its first adjustment, the additional fixed years on the 7/6 would not affect your loan.
The rates in this example are hypothetical. Actual pricing can produce a larger, smaller or nonexistent difference.
How Six-Month ARM Adjustments Work
The “6” in both loan names means the interest rate can change every six months after the initial fixed period.
That differs from a 5/1 ARM, which can adjust once per year after its initial period.
More frequent adjustments do not mean the rate automatically changes every six months. The new rate depends on the applicable index and margin, subject to the loan's caps.
If the fully indexed rate has fallen, an ARM may adjust downward, subject to any applicable floor. If it has risen, caps can limit how quickly the loan reaches the fully indexed rate.
Six-Month Adjustments Can Use Smaller Subsequent Caps
Fannie Mae's current standard 5/6 and 7/6 plans limit subsequent rate changes to 1 percentage point at each six-month adjustment.
That does not mean the two products have identical risk.
The first-adjustment cap is 2 percentage points on Fannie Mae's standard 5/6 plan and 5 points on its standard 7/6 plan.
Compare the complete cap structure rather than assuming that a six-month ARM can only move 1 percentage point when it first becomes adjustable.
How the Caps Can Affect Your Payment
Consider the same hypothetical $400,000 loans and apply the cap structures used by Fannie Mae's standard 5/6 and 7/6 plans.
| Scenario |
5/6 ARM |
7/6 ARM |
| Initial rate |
6.125% |
6.25% |
| Initial monthly P&I |
About $2,430 |
About $2,463 |
| First-adjustment cap in Fannie standard plan |
2 percentage points |
5 percentage points |
| Highest first-adjustment rate under these assumptions |
8.125% |
11.25% |
| Approximate payment at that rate |
$2,908 |
$3,654 |
| Subsequent adjustment limit |
1 percentage point every 6 months |
1 percentage point every 6 months |
| Lifetime increase permitted by these plans |
Up to 5 percentage points |
Up to 5 percentage points |
The example shows the maximum increase permitted by the caps, not a prediction of what the rate will do.
The actual adjustment can be smaller because the new rate is also limited by the index-plus-margin calculation.
The 7/6's larger first-adjustment cap also does not necessarily mean its payment will jump by 5 points. It means the cap itself would permit that change if the fully indexed rate were high enough.
An ARM risk calculator can help model the actual caps, margin and starting rate from your quote.
5/6 and 7/6 ARMs Use Modern Agency ARM Structures
Six-month ARMs are particularly relevant when comparing current conventional loan options.
Fannie Mae's standard ARM matrix includes 5/6, 7/6 and 10/6 SOFR-based products.
Fannie Mae's Standard ARM Plan Matrix identifies the 5/6 as Plan 4927 and the 7/6 as Plan 4928.
That does not mean all lenders or loan programs use the same ARM structures. The index, margin, caps and eligibility requirements depend on the specific mortgage.
Compare ARM Pricing With the Rate Environment
An ARM can be attractive when its initial pricing provides a meaningful advantage over comparable fixed-rate financing.
That advantage can change over time.
If the initial rate difference is small, the payment savings during the fixed period may also be small relative to the future adjustment risk.
The same applies when comparing the 5/6 with the 7/6. Sometimes the additional fixed years cost relatively little. Other times, the pricing difference is larger.
Whether an ARM makes sense when rates are high therefore depends on the actual quotes available, not simply the overall level of mortgage rates.
Compare Both With a Fixed-Rate Mortgage
Do not limit the comparison to two ARMs.
| Feature |
5/6 ARM |
7/6 ARM |
30-Year Fixed |
| Initial fixed period |
5 years |
7 years |
Full term |
| Adjustment frequency afterward |
Every 6 months |
Every 6 months |
No adjustments |
| Initial pricing |
Varies |
Varies |
Varies |
| Future rate uncertainty |
Begins after year 5 |
Begins after year 7 |
None from interest-rate adjustments |
If the ARM provides little initial savings relative to a fixed mortgage, compare what you are receiving in exchange for accepting future rate changes.
If the ARM's initial rate or total cost is meaningfully lower, calculate the dollar savings during the period you expect to keep the loan.
An adjustable- versus fixed-rate mortgage comparison should use the actual rates, points, lender credits and fees available to you.
Why Borrowers Consider 5/6 and 7/6 ARMs
The potential appeal of either structure is concentrated in the initial fixed period.
If you expect to sell the home or otherwise pay off the mortgage before adjustments begin, the initial pricing may matter more than the later index.
The 5/6 provides a shorter fixed period, while the 7/6 gives you another two years before adjustments can begin.
Those are among the potential advantages of adjustable-rate mortgages when ARM pricing is favorable.
But a planned sale or refinance is not guaranteed to occur on schedule.
Have a Plan if You Reach the Adjustable Period
You generally have three basic possibilities when the fixed period ends:
- Keep the ARM and make the adjusted payment.
- Refinance into another mortgage if you qualify.
- Sell the property and pay off the loan.
Refinancing an ARM into a fixed-rate mortgage can remove future adjustment risk, but qualification depends on conditions at that time.
Do not assume future rates will be lower. Also consider whether your income, equity and credit could support the refinance if your plans change.
5/6 ARM vs. 7/6 ARM by Expected Timeline
| Expected Time With the Mortgage |
What to Compare |
| Less than 5 years |
Whether the 5/6 offers enough pricing advantage to justify using an ARM |
| 5 to 7 years |
The cost of the 7/6's two additional fixed years |
| More than 7 years |
The adjustment risk on both loans and the cost of fixed-rate financing |
| Uncertain |
Rate caps, maximum potential payment and the value of a longer fixed period |
The timeline alone does not determine which structure costs less. Points, fees, initial rates, margins and caps also affect the comparison.
Run Both Scenarios
Use an ARM calculator to compare the starting payments and possible future adjustments.
Use the actual terms from each quote, including the fixed period, index, margin and all three types of rate caps.
Pay particular attention to the first-adjustment cap. It can differ even when two ARMs share the same six-month adjustment frequency.
Get Comparable Quotes
Compare the 5/6, 7/6 and fixed-rate option using the same loan amount, borrower profile, points or credits and lock period.
Get the quotes at about the same time so market movement does not distort the comparison.
The same process applies when comparing mortgage rates between lenders.
Other ARM Comparisons
A 5/1 vs. 7/1 ARM compares the same five- versus seven-year fixed-period difference using annual adjustments.
A 5/1 vs. 10/1 ARM creates a wider difference in the initial fixed period.
A 7/1 vs. 10/1 ARM compares longer annual-adjustment structures.
The 5/1 vs. 5/6 ARM comparison keeps the five-year initial period the same and focuses specifically on annual versus six-month adjustments.
Bottom Line
A 5/6 ARM and 7/6 ARM both can adjust every six months after the initial fixed period. The difference is that the 7/6 delays those adjustments for another two years.
Compare what those additional fixed years cost, then look beyond the initial rate to the first-adjustment cap, later caps, margin and lifetime ceiling.
For Fannie Mae's standard plans, the 5/6 and 7/6 also have different first-adjustment caps, so the fixed-period length is not the only term that can affect future payment risk.
FAQ
Is a 5/6 ARM Better Than a 7/6 ARM?
Neither is universally better. A 5/6 begins adjusting two years sooner and may have different initial pricing. A 7/6 provides two additional fixed years. Compare the initial rate, costs, index, margin and cap structure along with how long you expect to keep the mortgage.
What Happens After the Fixed Period on a 5/6 ARM Ends?
A 5/6 ARM can begin adjusting every six months. The new rate generally reflects the loan's index plus its margin, subject to the initial adjustment cap. Later changes are also subject to periodic and lifetime caps specified in the loan documents.
How Much Lower Is a 7/6 ARM Rate Than a 30-Year Fixed?
There is no standard rate difference. Depending on lender pricing and market conditions, a 7/6 ARM can have a lower initial rate, a similar rate or little pricing advantage compared with a fixed mortgage. Compare same-day quotes with the same points, loan amount and lock period.
Can You Refinance Out of an ARM Before It Adjusts?
Yes, if you qualify for another mortgage. A borrower can refinance before the initial fixed period ends, but future rates, home equity, income, credit and closing costs are unknown. A planned refinance should therefore not be treated as a guaranteed exit from an ARM.
What Are the Caps on a 7/6 ARM?
Caps depend on the specific loan. Fannie Mae's standard 7/6 ARM plan currently allows a first adjustment of up to 5 percentage points, subsequent six-month changes of up to 1 point and a lifetime increase of up to 5 points above the initial rate.
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