The Quick Read: The reset is the scheduled day your interest-only payment becomes a full principal-and-interest payment. The balance is still $4M, but it now amortizes over fewer remaining years, so the payment rises even if the interest rate never moves. How much it rises depends on the remaining term, the rate type, and whether your rent covers the new payment.
- A $4M interest-only balance does not shrink during the interest-only window unless you prepay.
- A longer total term leaves more years to amortize, so the step-up is smaller.
- On an adjustable note, a rate change and the start of amortization can land on the same date.
- Coverage that looks strong at closing can fall below 1.00x after the reset. A modest step-up is enough to do it.
- Above $4,000,000, every figure here is reviewed case by case before submission.
Key Terms Defined
Interest-only (I-O) period: The stretch when your scheduled payment covers interest only, so the loan balance stays flat.
Reset: The contractual end of the I-O period, when payments switch to principal plus interest.
Recast: An optional re-amortization after you make a lump-sum principal payment. It lowers the payment but does not shorten the term.
Amortization: Paying a loan down on a schedule so that each payment retires part of the balance.
DSCR (debt service coverage ratio): Monthly rent divided by the monthly housing payment. A ratio of 1.00x means rent equals the payment.
ADR (average daily rate): What a short-term rental earns per booked night.
Super jumbo: A loan large enough that it sits above the standard jumbo band. In Lendmire’s wholesale network, the stricter overlays begin above $3,000,000 on an investment property.
What Actually Happens at Reset
The reset is a payment event, not a rate event. When the period ends, you can pay off the balance, refinance if one is available, or start paying down principal in higher monthly payments.
Picture the mechanics step by step.
1. I-O phase. Each payment is the balance times the interest rate, divided by twelve. The balance stays at $4M if you only make required payments.
2. The trigger. On a 30-year note with a 10-year I-O period, amortization begins at month 121. The full balance is then repaid over the remaining 20 years.
3. The new payment. It is the standard amortization formula applied to the same balance over fewer months.
4. The step. Even at an unchanged interest rate, the payment rises, because the principal piece is now due.
The OCC’s consumer publication on interest-only mortgages says the payment rises when the I-O period ends, even if rates stay the same. It also lists expiring promotional rates and index increases as drivers of how large the increase is. And it cautions borrowers not to assume they can sell or refinance later, since property value and personal finances can change. That guidance addresses consumer loans. It is context for how the mechanism works, not a rule for business-purpose loans.
The warning matters more at $4M than at $400,000. Fewer lenders play at this size, and every one of them reviews these files individually.
Reset, Recast, Refinance: Three Different Events
People use these words loosely. They are not the same.
| Event | Who controls it | What changes |
|---|---|---|
| Reset | The note (scheduled) | Payment shifts to principal plus interest |
| Recast | You, with servicer consent | Lower balance re-amortized; payment drops |
| Refinance | You, with a new lender | New loan, new terms, new underwriting |
A refinance does not extend the old I-O clock. It replaces the loan, and any new I-O period needs fresh underwriting. A recast needs a lump-sum paydown, and servicers may agree to it but are not always required to.
What Sets the Size of the Jump
Five inputs drive the step-up. Know all five before you sign.
- Remaining amortization term. A 10-year I-O period on a 30-year note leaves 20 years. On a 40-year note it leaves 30. More years means a smaller step.
- Loan balance. It is unchanged unless you prepaid.
- Rate type. On a fixed note only the schedule shifts. On an adjustable note, the interest rate can move on the same date.
- Any rate step on a separate date. Read the adjustment terms for any second event.
- Term chosen at origination. Thirty versus forty years changes the reset more than most borrowers expect.
In the wholesale network Lendmire works with, the portfolio non-QM bank-statement program offers a 40-year term with a 10-year interest-only period, through select wholesale programs, subject to full underwriting. The bank portfolio program offers interest-only on 5- and 7-year fixed-period adjustables. A 10-year fixed-period adjustable on that program is fully amortizing, so it has no I-O cliff at all.
That last point is the stacking risk. On a fixed-period adjustable, the end of the fixed period is a rate event. If your I-O window ends on the same date, you absorb both changes at once. The note, the I-O rider, and the amortization schedule show the dates. Read them before closing.
How Big Is the Step-Up on a $4M Balance?
The honest answer is a formula, not a number. Quoting a dollar figure would require an interest rate, and the rate on your note is set by the lender on your file. What you can model is the relationship between payment step-up and coverage.
The structural picture looks like this:
| Structure | Remaining years at reset | Relative step-up |
|---|---|---|
| 30-year note, 10-year I-O | 20 | Larger |
| 40-year note, 10-year I-O | 30 | Smaller |
| Fixed-period adjustable, I-O | Set by note | Rate event can stack |
| Fully amortizing from day one | None | No cliff |
The 40-year structure softens the reset. It also means slower equity build afterward, because early amortized payments are mostly interest. That is the tradeoff: a gentler step now buys a lower principal paydown later.
What the Reset Does to Coverage for a Luxury STR
For a short-term rental, the payment becomes fixed while the revenue stays variable. That mismatch is the central risk. Luxury STR income swings with occupancy, ADR, and season. Peak-season months can flatter the picture. Many practitioners test trailing twelve-month revenue instead of the best quarter.
Here is the coverage math in ratio form. After the reset, coverage equals the old coverage divided by one plus the payment step-up. These step-ups are modeled assumptions, not forecasts and not quotes.
| Coverage on I-O payment | Step-up 20% | Step-up 35% | Step-up 50% |
|---|---|---|---|
| 1.40x | 1.17x | 1.04x | 0.93x |
| 1.30x | 1.08x | 0.96x | 0.87x |
| 1.20x | 1.00x | 0.89x | 0.80x |
Read the table by row. A property at 1.30x on the I-O payment survives a 20% step-up with a thin margin. A 35% step-up pushes it just under 1.00x.
Now the break-even. Revenue can fall by one minus the reciprocal of the coverage ratio before coverage hits 1.00x. At 1.30x that cushion is about 23%. At 1.17x, after a 20% step-up from 1.40x, the cushion drops to about 15%. At 1.08x it is roughly 7%. One soft season can eat that.
Most standard DSCR programs treat 1.00x as a baseline because rent covers the payment at that level. Select lenders in the network will review coverage below 1.00x, but leverage and terms adjust. Never plan around that exception. Plan around coverage that survives the reset.
Which Payment Does the Underwriter Test?
This is the question to ask first. Some programs test coverage on the I-O payment. Others test on a fully amortizing payment. In the first case, your closing ratio overstates the coverage you will live with after the reset. In the second, the ratio you see at closing is already the stress case.
Ask your broker which payment the program tests. Then run the other one yourself.
Here is the first-hand pattern from placing high-balance files: STR operators often arrive with a strong peak-season story and a thin off-season. The files that go smoothly bring twelve months of booking history and a reset-year coverage test already done. The ones that stall bring one hot quarter.
A Scope Note on Bank-Statement Qualification
Not every $4M STR loan runs on rental coverage. The high-net-worth path through select wholesale programs is reviewed on documented income instead: twelve or twenty-four months of personal or business bank statements, with deposits reduced by an expense ratio. Business statements need at least 25% ownership, and deposit history is what the review rests on.
If your STR revenue runs through a business account, that deposit history can carry the file. If you want rental coverage to carry it, you are on the DSCR route, which has its own terms. The complete DSCR loans guide covers how that route works.
Both routes are reviewed individually. Above $4,000,000, every figure is reviewed case by case before submission.
What Leverage Looks Like at This Size
Leverage changes by loan-size band, and it does not fall in a straight line, because a different program takes over at some bands. On an investment property, through select wholesale programs and subject to underwriting, the ladder around this size runs like this:
- $3.5M to $4M: 60% on a purchase and 55% on a cash-out, on the bank portfolio program.
- $4M to $5M: 65% on a purchase, 60% on a rate-and-term refinance, and 55% on a cash-out, on the portfolio program with super-jumbo overlays. The top cell needs a 760 score. Each is reviewed case by case before submission.
A $4M balance sits right on the line between those bands. The I-O structure itself tops out at 85% LTV on the portfolio program (700 credit floor), and at 60% on the bank program. At this size the size ladder governs, not the I-O ceiling. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.
Other overlays apply on the portfolio program above $3,000,000 on an investment property: a 700 credit floor, 0x30x24 housing history, 48-month seasoning on credit events, U.S. citizens and permanent residents only, and no rural property. The bank portfolio program keeps its own 680 credit floor at every size. Reserves are nine months at this loan size, and cash-out proceeds cannot satisfy them.
Business-purpose loans like these are generally outside consumer-mortgage rules, and the lender decides the loan’s primary purpose case by case, as Regulation Z’s exemption for business-purpose credit describes. Short-term rental rules can vary by city, county, HOA, and property type, so investors should confirm local rules before relying on projected rental income.
Your Four Exits at the Reset
The reset is a scheduled liability. Pick your exit before you close.
| Exit | What it requires | Main risk |
|---|---|---|
| Absorb | Coverage that survives the new payment | Revenue dip |
| Refinance | Value, income, and credit that qualify then | Tight lending or lower value |
| Sell | A buyer and enough equity | Little paydown; equity comes from appreciation |
| Prepay | Cash to reduce the balance | Cash drained from reserves |
The refinance exit deserves a hard look. It depends on conditions you cannot control: the appraised value, your income, and lender appetite at that time. Lendmire’s piece Can a Luxury STR Operator Refinance a Resetting Super Jumbo IO Loan? shows what a refinance can and cannot do at this size.
Prepayment penalties may apply on investor loans, so check the note. A penalty can make an early refinance expensive.
Using the I-O Years Well
Interest-only improves cash flow and coverage early. It does not build equity. Unless you paid extra, you owe the same balance at the reset that you owed at closing.
Three uses make sense.
1. Build reserves. The freed cash flow becomes a cushion for the reset year.
2. Prepay. Voluntary principal payments shrink the balance and soften the step-up.
3. Redeploy. Put the cash to work, but only if the redeployment earns more than it risks.
The failure mode is simple. The cash flow gets spent. Then the reset arrives with the same balance and no cushion. Not ideal.
Who I-O Fits and Who It Doesn’t
I-O fits an operator who has a defined exit before the reset, trailing twelve-month revenue that clears the post-reset payment, and reserves beyond the program minimum. It also fits someone planning a sale or refinance well inside the I-O window.
It does not fit an operator who needs the I-O payment to make the property work at all. If coverage only clears 1.00x on the interest-only payment, the loan is a bet on income growth. The stronger play might be a fully amortizing structure from day one, though investors buying for cash flow in early years could argue the other way.
Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.
Frequently Asked Questions
Does the payment rise if interest rates don’t move?
Yes. On a fixed note, the payment rises because you start repaying principal over fewer remaining years. The rate can stay flat and the payment still steps up. On an adjustable note, a rate change can add to that increase.
Is there a balloon payment at the end of the I-O period?
It depends on the note. Some structures convert to amortization at the end of the I-O period. Others mature with the balance due, which creates refinance risk. Read the note and the I-O rider to see which one you have.
Is a reset the same as a recast?
No. A reset is scheduled and mandatory. A recast is optional and follows a lump-sum principal payment, after which the servicer re-amortizes the lower balance. A recast lowers the payment but does not shorten the term.
What if my STR income drops before the reset?
Coverage falls with it, and the reset payment does not adjust. You can prepay principal, build reserves in the I-O years, or refinance if the property and income still qualify. Underwriters usually test trailing twelve-month revenue, so a soft stretch shows up in the file.
Can I extend the I-O period?
Not by asking. Extending means a new loan with fresh underwriting, and the outcome depends on value, income, and credit at that time. Through select wholesale programs, the interest-only window is set when the loan is made.
Next Step
Reach the team at 828-256-2183 or request a quote through the Lendmire quote page. Nothing here is a commitment to lend; every file is underwritten individually.
For current guidelines and terms, see Lendmire’s super jumbo bank statement loan programs page.
Lendmire’s self-employed mortgages page presents both super jumbo programs, bank statement and DSCR, side by side.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage brokerage built around DSCR investor lending, with programs available in 41 markets, including Washington, D.C. DSCR lenders commonly evaluate rental-income coverage instead of personal income paperwork — a practical fit for LLC-owned and multi-property investors. Terms vary by lender, property, leverage, and program. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. OCC — Interest-Only Mortgage Payments and Payment-Option ARMs
2. CFPB — Reg Z § 1026.3 Exempt transactions
This article is part of Lendmire’s super jumbo bank statement loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How Much Can a High-Earning W-2 Buyer Borrow on a Jumbo Loan Before It Turns Super Jumbo? · How to Qualify for a Super Jumbo Loan With K-1 Income · How to Use 40-Year Amortization to Borrow More on a Super Jumbo Loan
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.