What happens when my adjustable rate mortgage resets?

When your ARM resets, your rate recalculates based on an index (typically SOFR, currently around 4.35%) plus a margin set in your loan documents (usually 2.0-2.75%). For a 5/1 ARM taken at 2.75% in 2021, the adjusted rate could jump to 6.35-7.10%, increasing your monthly payment by over $1,000 on a $500,000 balance.

Should I refinance my ARM to a fixed rate mortgage?

Refinancing to a fixed rate makes sense if you plan to stay 5+ years and want payment certainty. Current 30-year fixed rates are 6.0-7.0% as of February 2026. Calculate your break-even: divide refinance closing costs by your monthly savings. Start planning 6 months before your reset date.

Will my ARM rate ever go down on its own?

Yes. ARM rates adjust both ways. If the underlying index (SOFR) decreases because the Federal Reserve cuts rates, your ARM rate adjusts down at the next annual reset.

28 Feb 2026 4 min read Guides

ARM Reset Survival Guide: What to Do When Your Adjustable Rate Mortgage Adjusts

Q: What is a mortgage recast and how does it work?

A mortgage recast is when you pay a large lump sum toward principal and the lender re-amortizes your remaining balance at your current rate over the remaining term. It costs only $250-$500 versus $10,000+ for a refinance. Most conventional loans allow recasts; FHA and VA loans do not.

Photo by Towfiqu barbhuiya / Unsplash

If you took out a 5/1 or 7/1 ARM in 2019-2021, your fixed period is ending or has already ended. Your rate is about to adjust — and depending on where rates were when you locked vs. where they are today, the jump could be significant.

Here's what actually happens, what your options are, and how to do the math.

How an ARM Reset Works

An ARM (adjustable-rate mortgage) has two phases:

Fixed period — Your rate stays locked (5 years for a 5/1, 7 years for a 7/1, 10 years for a 10/1)
Adjustment period — Your rate recalculates annually based on an index + margin

The formula:

New Rate = Index (typically SOFR) + Margin (set in your loan docs)

As of February 2026:

30-day average SOFR: ~4.35%
Typical margin: 2.0% - 2.75%
Resulting adjusted rate: 6.35% - 7.10%

If you locked a 5/1 ARM at 2.75% in 2021, your rate could jump to 6.35% - 7.10% at first adjustment. That's a massive payment increase.

The Payment Impact (Real Numbers)

Example: $500,000 loan balance, 5/1 ARM taken in 2021

	Original ARM Rate	After First Reset	Change
Rate	2.75%	6.50% (estimated)	+3.75%
Monthly P&I	$2,041	$3,160	+$1,119/mo
Annual cost increase	—	—	+$13,428/year

Your payment jumps $1,119 per month. That's real money.

Your Cap Structure (Read Your Loan Docs)

Every ARM has rate caps that limit how much your rate can change. The standard structure is expressed as three numbers, like 2/2/5 or 5/2/5:

First number (initial cap): Maximum increase at first adjustment (2% or 5%)
Second number (periodic cap): Maximum increase at each subsequent annual adjustment (typically 2%)
Third number (lifetime cap): Maximum increase over the life of the loan (typically 5-6%)

Example with 2/2/5 caps, starting rate 2.75%:

First reset: max 4.75% (2.75% + 2%)
Second year: max 6.75% (4.75% + 2%)
Lifetime: max 7.75% (2.75% + 5%)

Example with 5/2/5 caps, starting rate 2.75%:

First reset: max 7.75% (2.75% + 5%) — ouch
Lifetime: max 7.75%

Check your loan documents (specifically the adjustable rate rider) for your exact cap structure.

Your Four Options

Option 1: Refinance to a Fixed Rate

Best when: You plan to stay 5+ years, want payment certainty, and can qualify at today's rates.

Current 30-year fixed rates: 6.0% - 7.0% (Feb 2026)
Closing costs: 1.5% - 3% of loan amount
Timeline: 30-45 days

The math: If your ARM is resetting to 6.5% and a 30-year fixed is also 6.5%, refinancing locks in that rate forever instead of risking further increases. Even if the rate is the same today, the ARM could go higher next year.

Break-even calculation:

Closing costs / Monthly savings = Months to break even

If closing costs are $8,000 and you save $200/month by locking in vs. future ARM increases, break-even is 40 months.

If your main concern is rate, you could also refi the first mortgage to a lower fixed rate and then open a HELOC for flexibility. Compare this with a HELOC strategy if you want to keep your first mortgage.

Option 2: Refinance into a New ARM

Best when: You plan to sell or refi again within 5-7 years, and want to stay in an ARM structure.

A new 7/1 ARM today might be 5.75% - 6.25%, which is lower than a 30-year fixed. This buys you 7 more years of a fixed rate before the next reset.

Risk: You're kicking the can. If rates are higher in 7 years, you're in the same position again.

Option 3: Mortgage Recast

Best when: You have a lump sum available (bonus, savings, inheritance) and want to lower payments without refinancing.

A recast means you pay a large lump sum toward principal, and the lender re-amortizes your remaining balance at your current rate over the remaining term. No new loan, no closing costs (just a $250-$500 recast fee).

Example:

Current balance: $450,000 at 6.5% (after ARM reset)
Pay $100,000 lump sum
New balance: $350,000 at 6.5%
Payment drops from $2,844/mo to $2,212/mo — saving $632/month
Cost: $250 recast fee vs. $10k+ refi closing costs

Not all loan servicers offer recasts. Call yours and ask. Most conventional loans allow it; FHA and VA do not.

Option 4: Ride It Out

Best when: You're close to paying off the loan, plan to sell soon, or rates are expected to decrease.

If the Fed cuts rates, SOFR drops, and your ARM adjusts lower at the next annual reset. If you believe rates will decrease in the next 12-24 months, riding the ARM could work in your favor — your rate adjusts down automatically.

Risk: Rates could go higher too. You're betting on the direction of the market.

Decision Framework

Situation	Best Option	Why
Staying 5+ years, want certainty	Refi to fixed	Locks in rate forever
Selling within 3 years	Ride it out	Refi costs won't break even
Have $50k+ lump sum available	Recast	Lower payment, minimal cost
Staying 5-7 years, want lowest rate	New ARM	Lower initial rate than fixed
Rate already hit lifetime cap	Ride it out or refi	Can't go higher than cap