The Quick Read: The payment jumps at the reset because the loan balance has not moved, and it must now be repaid over the months that remain on the note. The financing terms do not have to change for this to happen. The size of the jump depends mainly on how long the interest-only period runs and how many amortizing months are left.
- During the interest-only period, the payment covers interest only, so the balance stays flat.
- At the reset, the same balance amortizes over the remaining term, not a fresh 30 years.
- A longer interest-only period and a shorter remaining term both make the jump bigger.
- Rent usually does not change on reset day, so the coverage ratio falls when the payment rises.
- Model the reset before closing, and plan the exit (sell, refinance, or hold) well ahead of the date.
What Actually Happens on Reset Day
A DSCR interest-only loan has two phases. In the first, the borrower pays interest on the balance. Nothing goes to principal. In the second, the loan amortizes, and every payment now carries interest plus principal.
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Say a 30-year note has a 10-year interest-only period. At month 121, the full balance gets spread across the remaining 240 months. The balance is the same, the time to pay it is shorter, and the payment climbs.
Two formulas drive everything. The interest-only payment is the balance times the annual interest factor, divided by 12. The post-reset payment is the standard amortizing payment on that same balance over the months left.
This is not negative amortization. A standard interest-only loan pays all accrued interest every month, so the balance never grows. Negative amortization belongs to payment-option products, which let the borrower pay less than the interest due.
DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage. Interest-only periods are available through select lenders in Lendmire’s wholesale network, and terms vary by lender and program.
Key Terms Defined
Interest-only period: The stretch at the start of the loan when payments cover interest only and principal stays untouched.
Reset: The date the loan switches from interest-only payments to fully amortizing payments over the remaining term.
PITIA: Principal, interest, taxes, insurance, and association dues, the full monthly housing obligation that DSCR compares rent against.
Remaining amortization term: The number of months left after the interest-only period ends, which sets how fast principal must be repaid.
Payment shock: The percentage rise in the payment on reset day.
Mortgage recast: A lump-sum principal payment followed by re-amortization, which lowers the payment. It is a different event from an interest-only reset, which raises the payment, and the two terms get confused often.
Why the Jump Gets Bigger
Two things stack up at the reset. Principal repayment starts, and the repayment window is shorter than the original term. Either one alone raises the payment. Together they produce the step-up investors see.
The remaining term is the biggest lever. A 30-year note with a 5-year interest-only period amortizes over 25 years afterward. A 40-year note with 10 interest-only years leaves 30 years of amortization. Extended terms are available through select lenders in the network, and a longer tail spreads principal over more months, so the jump is smaller.
| Structure (illustrative) | Months amortizing after reset | Relative jump |
|---|---|---|
| 30-year note, 5 years interest-only | 300 | Smaller |
| 30-year note, 7 years interest-only | 276 | Moderate |
| 30-year note, 10 years interest-only | 240 | Larger |
| 40-year note, 10 years interest-only | 360 | Smaller than the 30-year version |
This table is an illustration of direction, not a list of program terms. The interest-only lengths a file can actually use depend on the lender, the loan size, and the property.
The size of the jump also depends on the pricing level of the loan in a way many investors do not expect. Cheaper financing produces a larger percentage jump, and costlier financing produces a smaller one. The interest-only payment scales directly with the pricing, while the amortizing payment is less sensitive to it. One calculator reference table shows a 5-year interest-only period on a 30-year loan producing a much larger jump in a low-cost scenario than in a high-cost one. Treat those as calculator illustrations, not program norms.
How Big Is the Jump in Practice?
No program-level data set gives one typical percentage for DSCR files. The honest answer is a range that depends on pricing, interest-only length, and remaining term.
Public calculator examples land in a wide band. Faro Labs’ calculator shows roughly 21% for a 5-year interest-only period amortizing over 25 years. Another public calculator example, a 30-year loan with 10 interest-only years, shows about 38%. Those inputs differ, so the results differ.
A fair planning range for common 30-year fixed structures runs from the low double digits to somewhere near 40% on the principal-and-interest line. Treat that as a starting point, then calculate your own figure from the note.
The Federal Reserve’s joint release on interest-only and payment-option products said payments may double or even triple. That is an outer-bound consumer warning covering option-ARM products, not a typical DSCR outcome. A fixed-rate interest-only loan that converts to a standard amortizing schedule follows the same arithmetic as the calculator ranges above, which is why the note’s own terms matter more than any headline figure.
One more point matters. The percentages above describe principal and interest. Taxes, insurance, and dues do not jump at the reset, so the total PITIA payment rises by a smaller percentage than the principal-and-interest line.
What the Jump Does to the Coverage Ratio
The coverage ratio is rent divided by the monthly obligation. Rent stays the same on reset day, so when the payment rises, the ratio falls. The ratio falls by a smaller percentage than the payment rose, because the payment sits in the denominator.
Run a simplified case. A property covers its interest-only payment at 1.30x. If the payment then rises by one-third, the ratio drops to about 0.98x on the same rent. This is a modeled illustration with taxes and insurance left out for clarity. In a real file, taxes and insurance dilute the percentage, so the drop is smaller.
The break-even logic is simple. Holding the same ratio after the reset takes a rent increase equal to the payment’s percentage increase. If the payment rises 20%, rent must rise 20% to keep the ratio where it was.
Clearing 1.00 is not the same as positive cash flow. DSCR compares rent to PITIA only. Repairs, vacancy, management, utilities, and capital expenses sit outside the calculation. A ratio that looks fine on paper can still leave thin real cash flow after the reset.
Many select programs start at 1.00 coverage. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Stronger ratios generally open better leverage and pricing. A reset that drops a property from comfortable coverage to borderline coverage changes which of those paths a refinance would fall under.
How Lenders Test Coverage on an Interest-Only File
Ask which payment the file is being tested on before choosing the structure. A file that qualifies only on the interest-only payment is a file that depends on the exit plan.
Rent evidence stays the same either way. It comes from a signed lease or the appraiser’s market-rent opinion. Only the payment it gets divided by changes.
Leverage rules do not change because the loan is interest-only. Most purchase files land at 75% to 80% LTV on an investment property. Credit floors, reserve rules, and property eligibility still apply. Reserves commonly run around 6 months of PITIA, stepping up to about 9 months on loans above $1,500,000, subject to lender guidelines. Manufactured homes, log homes, and barndominiums are not offered in these programs.
Variants and Edge Cases Where the Rule Breaks
The general rule says the payment rises when principal repayment starts. These cases change how much.
Shortened amortization after the interest-only period. Some programs do not restart a fresh 30-year clock. They amortize over the years that remain, which makes the jump steeper than a first-time borrower expects. Read the note for the exact remaining term.
Adjustable-rate interest-only. On an ARM, the reset can hit two things at once. The payment type changes, and the pricing moves from its initial period to an indexed level. Fixed-rate interest-only changes only the payment type. ARM structures exist for investors who want them, but the second variable makes stress testing harder.
Balloon structures. Some interest-only structures come due at the end instead of amortizing. In that case the reset is a payoff event, and the exit plan is the whole plan.
Extra principal during the interest-only period. Voluntary principal payments lower the balance, which lowers both the interest-only payment and the recalculated payment. They are one of the few levers a borrower controls.
Very large balances. On the largest loans, above the $2,500,000 mark, the network generally holds to 30-year fixed structures, so extended-term and interest-only options narrow.
Recast confusion. A lump-sum paydown followed by re-amortization lowers the payment. That is a recast in the lender’s sense, and it is the reverse of the reset described here.
DSCR vs. conventional financing
There are two common ways to finance an investment property, and they qualify you differently — here’s how investors weigh them.
Why investors choose it
- Qualifies on the property’s rental income — no personal tax returns, W-2s, or pay stubs needed to document income.
- No personal debt-to-income ceiling to clear, so existing mortgages and obligations don’t cap your borrowing the same way.
- Can be closed in an LLC, keeping the property inside a business entity.
- Built for scaling — not held to the limit on number of financed properties that conventional financing applies.
- Underwriting centers on the deal: generally qualifies when the rent covers the payment, a 1.00x coverage ratio being a common baseline (confirmed in underwriting).
- Designed specifically for investment property, including long-term and, where the program allows, short-term rentals.
Where it’s strong
- Often the lowest ongoing financing cost for a buyer who fully qualifies on personal income — a fit for a first property or a cost-first purchase.
Trade-offs for investors
- Requires full personal income documentation and must fit within a debt-to-income limit — salary, existing debts, and other mortgages all count.
- Typically held in your personal name rather than a business entity.
- Caps how many financed properties you can carry, which can become a ceiling as a portfolio grows.
- Evaluates you as a borrower as much as the property, which usually means more paperwork.
How investors usually choose: a first or single property often optimizes for the lowest financing cost; portfolio builders often optimize for leverage, vesting in an LLC, and scaling past conventional caps. The right answer depends on your goals, the property, and current guidelines — both paths run through select lenders in Lendmire’s wholesale network, with eligibility and terms confirmed in underwriting.
Stress-Test Your Own Reset
Do this before closing, not when the date arrives.
1. Find the trigger. Locate the interest-only months, the total term, the amortization schedule, and the maturity date on the note. Confirm whether a balloon is possible.
2. Calculate the new payment. Use the balance and the remaining months, and add taxes, insurance, and dues to get the full obligation.
3. Hold rent flat. Divide current rent by the new obligation to see the worst-case ratio.
4. Raise the expenses. Taxes and insurance often rise over several years, so test the ratio with higher costs.
5. Set a reserve target. Having reserves on hand at the reset date gives you room if rent has not kept pace.
6. Stagger the dates. Investors with several interest-only loans should avoid having every reset land in the same year.
The reset is a scheduled event. That makes it one of the few payment increases an investor can see years in advance.
Your Options Before the Date Arrives
Investors generally have four paths. They can sell, refinance, pay down principal, or hold through the reset with reserves.
Refinancing is the most common plan, and it is also the one people assume too easily. A refinance depends on the property’s value and rent at that time, the borrower’s credit, and lender guidelines. The OCC’s interest-only consumer guidance warns against assuming a sale or refinance will be available when the payment rises. That caution is aimed at consumer loans, but the logic holds for investors too.
If the plan is a cash-out refinance, the leverage ceiling on a standard rental is around 75% LTV across most of the network, and about 6 months of seasoning is the common expectation. A property that has lost coverage since origination may qualify for less leverage than the original loan carried. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.
For the full program picture, the complete DSCR loans guide covers requirements, leverage, and structures in one place.
Frequently Asked Questions
Does the interest rate reset too?
Not on a fixed-rate loan. The payment rises because principal repayment begins, and the pricing stays where it was. On an adjustable-rate structure, the pricing can also move at the reset, which adds a second source of change.
Is there negative amortization?
No. A standard interest-only loan pays all accrued interest every month, so the balance stays flat. Negative amortization comes from payment-option products where the minimum payment is below the interest due.
Do I build equity during the interest-only period?
Not through payments. The balance stays flat, so any equity growth comes from appreciation or from voluntary principal payments you choose to make.
Will the lender test the post-reset payment?
It depends on the program. Many files are tested on the interest-only payment, and some lenders also test the fully amortizing payment. Ask which one applies before choosing the structure.
Can I refinance before the reset?
Usually yes, subject to lender guidelines, property value, rent, and credit. A refinance before the reset means you may never pay the higher payment. It also means the new loan has to qualify on its own, which is why the exit plan needs to be tested early.
Planning the Reset Before You Close
If you are buying or refinancing a rental property and want to see how the numbers work, Lendmire can help you compare DSCR loan options based on the property income, credit profile, leverage, and investor goals. Lendmire is a broker that arranges financing through select lenders in its wholesale network across 41 markets, including Washington, D.C., and nothing here is a commitment to lend.
About Lendmire
As a non-QM mortgage broker (NMLS# 2371349), Lendmire facilitates DSCR investor loans across 41 markets, including Washington, D.C. DSCR eligibility is generally reviewed around property-level rental income instead of personal income documentation, subject to lender guidelines, serving LLC-structured portfolios and self-employed borrowers who don’t fit conventional boxes. A two-time Scotsman Guide Top Mortgage Workplace (2025, 2026).
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References
1. 4calculators – Interest-Only Loan Payment Calculator
2. Faro Labs – Interest-Only Calculator
3. Federal Reserve joint release on interest-only and payment-option products
4. OCC – Interest-Only Mortgage Payments and Payment-Option ARMs
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How Much DSCR Cash-Out Releases on a Rented Rehab · How Much Cash Comes Out of a DSCR Cash-Out Refinance for Repairs Without a Contractor? · What Happens to Your DSCR Cash-Out When an Ex Is Still on the Mortgage?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Required disclosures. Lendmire (NMLS# 2371349) operates as a licensed mortgage broker, not a direct lender or depository. The discussion in this article is general in nature and should not be relied upon as financial, legal, or tax advice — every investment scenario is unique and should be reviewed by a qualified professional. Any loan inquiry is subject to lender underwriting, and this article is not a commitment to lend or a guarantee of approval. Mortgage rates, loan terms, and program guidelines vary by borrower, property, and state, and may change without notice. Equal Housing Opportunity. Verify licensure at NMLS Consumer Access.