The Quick Read: This refinance replaces your current rental loan with a new note that usually allows interest-only payments for an initial window, often ten years, then amortizes over the remaining term, and the lender tests whether the property’s rent covers the new payment, subject to lender guidelines. Extended terms and interest-only periods are available through select lenders in a wholesale network, not on every program. The structure lowers the early payment, but it also defers principal and sets up a payment step-up later.
- “40-year” usually means an interest-only window followed by a long amortizing tail, not 40 years of interest-only.
- The coverage formula never changes. Only the payment you divide into the rent changes.
- Ask each program which payment it tests: interest-only or fully amortizing.
- Cash-out tops out around 75% LTV on a standard rental, and about 6 months of seasoning is the common expectation.
- The reset at the end of the interest-only window is the main risk. Plan for it before you sign.
What Does “40-Year Interest-Only” Actually Mean?
It means a loan with a 40-year schedule, 480 monthly payments, where the first stretch is interest-only. Trade press describes the typical build as a 40-year non-QM loan with ten interest-only years that then converts to a 30-year schedule. Non-QM just means the loan sits outside the standard mortgage mold.
DSCR Cash-Out Calculator
Run the cash-out numbers in your market
Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Oct 29, 2026
Prefilled with starting assumptions — enter your property’s value, balance, taxes, and insurance for a more accurate picture.
Program parameters update from Lendmire’s centralized guideline source. Taxes and insurance are editable estimates.
As of Oct 29, 2026 · General Freddie Mac market benchmark, not a Lendmire loan offer. Property value, balance, taxes, and insurance are editable estimates. Maximum loan-to-value varies by lender, program, property type, and seasoning. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
Do the math on a ten-year window. Of 480 payments, 120 are interest-only and 360 amortize. A 30-year note with the same window leaves only 240 amortizing months. So the 40-year build produces a smaller step-up when the window ends.
Here is the catch: “40-year” and “interest-only” are separate features that lenders bundle. A loan can be one, the other, or both. Always read the note for three things: how long the interest-only window runs, how long the amortization runs after it, and which payment gets tested.
| Structure | Early payment | After the window | Equity build |
|---|---|---|---|
| 30-year fixed | Full (P&I) | Same | Starts day one |
| 40-year fully amortizing | Lower than 30-year | Same | Slow start |
| 40-year, 10 years IO | Interest only | Steps up | None until reset |
Availability is the next hurdle. Scotsman Guide reports that 40-year loans are non-QM products and still relatively uncommon. That matches what a broker sees. Across a wholesale network, the 30-year fixed is the spine. Extended terms and interest-only periods exist through select lenders, and ARM structures exist for investors who want them.
Key Terms Defined
DSCR (debt service coverage ratio): The property’s monthly rent divided by its monthly housing payment. Above 1.00 means rent covers the payment.
PITIA: Principal, interest, taxes, insurance, and any HOA dues. It is the full monthly obligation on the property.
Interest-only period: The window where you pay interest and no principal. The balance does not shrink.
Amortization: The schedule that pays the balance down over time. After the interest-only window, the full balance is spread over the remaining months.
Seasoning: The waiting period a lender wants between buying or last refinancing a property and the new loan.
Rate-and-term refinance: A new loan that replaces the old debt and costs, with no meaningful cash back.
Cash-out refinance: A new, larger loan that pays off the old one and hands you the extra equity.
How Does Underwriting Treat the Payment?
The lender compares rent to the monthly obligation. That is the whole test. Our complete DSCR loans guide walks through the formula in detail, so here the focus is the one thing this structure changes: the denominator.
Programs differ on which payment they test. Some qualify the loan on the interest-only payment, which drops principal from the calculation. Others test the fully amortizing payment, even during the interest-only window. Most programs we place files with fall into one camp or the other, and the answer should be in writing before you pay for an appraisal.
| Test | What it divides rent by | Effect on ratio |
|---|---|---|
| Interest-only tested | Interest plus taxes, insurance, dues | Higher ratio |
| Amortizing tested | Full payment with principal | Lower ratio |
Run a modeled example. Say a rental tests near 1.25x on the interest-only payment. Add principal on a fully amortizing schedule and the same rent drifts toward the low end of the 1.0 range. Same rent, same property, same loan size. Different answer. These ratios are assumptions for illustration, not market data.
Sizing matters too. Standard programs run up to $3,000,000, but above $2,500,000 the network generally holds to 30-year fixed structures. A very large balance usually cannot take the 40-year interest-only route.
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. That is why interest-only periods and extended terms can exist here at all.
One more point on the number. Clearing 1.00 is not the same as positive cash flow. DSCR counts PITIA only. Repairs, vacancy, management, utilities, and capital expenses sit outside it.
Is This Refinance Right for Your Rental?
Use a simple go, restructure, or wait test.
Go when three things line up. The rent clears the coverage the program wants at the payment it tests. Your equity fits the leverage cap. And you have a real plan for the reset, whether that is a sale, another refinance, or comfortable coverage on the post-reset payment.
Restructure when the rental passes only on the interest-only payment. Consider a larger down payment on a purchase, or less cash-out on a refinance. A lower balance lowers the payment and can lift the ratio. But it never erases leverage caps, credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage.
Wait when the property is inside its seasoning window, or when your current loan carries a prepayment penalty that eats the savings. Waiting is not failure. It is arithmetic.
A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Where many select programs start at 1.00, those files usually need lower leverage or stronger compensating factors.
What Are the Steps to Refinance a Rental Into This Structure?
Seven steps, in order.
1. Name the goal. Lower the payment, lift the ratio, or pull cash. The goal picks the loan type.
2. Run a viability check. Estimate value, leverage, and coverage at the new structure before you call anyone. Do it at both the interest-only and the amortizing payment.
3. Confirm the program. Ask whether it offers a 40-year interest-only note, which payment it tests, and what the prepayment terms are. Loan size and property type must fit.
4. Check seasoning. About 6 months is the common expectation on a cash-out. Each program sets its own clock. It is a program rule, not a law.
5. Order the appraisal. It sets value for leverage and supplies the market rent. Fannie Mae’s appraiser guidance identifies Form 1007 as the single-family comparable rent schedule, built on monthly-lease comparables. Two-to-four unit properties use a different form, the small residential income report, Form 1025. Give the appraiser your lease, scope of work, and photos if you did a rehab.
6. Assemble the file. Typical items: lease or rent schedule, entity documents if you borrow through an LLC (subject to lender program eligibility), insurance declaration, current payoff statement, reserve proof, and a credit report. The file qualifies primarily on property-level rental income covering the payment, subject to lender guidelines.
7. Close, then calendar the reset. Mark the month the interest-only window ends. Plan to cover the stepped-up payment from rent, without counting on rent growth.
Rate-and-Term or Cash-Out Under This Structure?
Rate-and-term is the cleaner file. It replaces the debt and costs, and leverage can run higher: up to 85% LTV on a rate-and-term refinance of an investment property on select programs.
Cash-out is a different file. On a standard rental, the ceiling is around 75% LTV across most of the network. On short-term-rental collateral, the cash-out ceiling is 70%, with about 12 months of hosting history and a 640+ score expected. 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. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
Cash-out also raises the balance, which raises the payment and lowers coverage. If the file only passes on the interest-only payment, taking cash can push it over the edge. Sometimes the best move is to skip the cash.
Credit matters on both. A 620 floor exists in parts of the network, most programs want around 660, and 700+ unlocks the strongest leverage tiers. Reserves commonly run about 6 months of PITIA, stepping up to about 9 months above $1,500,000. Reserves vary by lender, leverage, and loan size, and conservative rate-and-term files at modest balances can see them waived.
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.
What Does It Cost, and How Do You Find the Break-Even?
A lower payment is not free. Three costs decide whether the refinance pays.
Your old loan’s prepayment penalty. Many DSCR loans carry one, often as a schedule that steps down over several years. Refinance inside the window and you may pay it. This is the big trap for anyone refinancing a loan they only recently got. Check the note before anything else.
New closing costs. Non-QM pricing has no caps on closing costs and fees, so costs vary. A “no out-of-pocket” refinance usually moves those costs into the loan’s pricing. They don’t vanish.
The new loan’s own prepayment terms. A longer penalty can come with better pricing. Compare both over the hold you realistically expect, not the best case.
The break-even test is simple. Add the old penalty and the new costs. Compare that to the monthly savings over your real hold period. If you will sell or refinance again before the savings cover the costs, skip it.
Now the total-cost honesty. Interest-only does not reduce interest. It defers principal. A longer amortization generally means more total interest over the life of the loan. You are buying lower payments and flexibility, and paying for them over time. For some investors that trade is smart. For others it is a slow leak.
How Do You Plan for the Reset?
The reset arrives when the interest-only window ends and the payment steps up. After a ten-year window, a 30-year note leaves 20 years to repay principal. A 40-year note leaves 30. The step-up is smaller on the 40-year build, but it is still a step.
You have four options: hold, pay down early, refinance again, or sell. Holding works if rent still covers the higher payment. Refinancing again works only if the property qualifies under the lending conditions of that day. Nobody can promise that now. (A refinance exit is a plan, not an entitlement.)
Test the exit today. Take your current rent, with no growth, and run it against the amortizing payment. If coverage still lands above 1.00x, the reset is manageable. If it only passes on the interest-only payment, you are betting on rent growth or a future refinance. That is a decision, not a default.
Also remember that taxes, insurance, and HOA dues are still owed during the interest-only years, and they can rise.
Where Does the General Rule Break?
Four edge cases come up often.
Three meanings of “40-year.” It can be ten interest-only years plus a 30-year tail, a full 40-year amortization, or an interest-only window on a 30-year note. A pure 40-year mortgage with no interest-only period and no balloon also exists. Confirm which one you are being offered.
Short-term rentals. The 1007 rent schedule is built on monthly-lease comparables, so it cannot be used with nightly rates multiplied by 30, per the same Fannie Mae appraiser update. Leverage caps are also lower, with purchases to 75% LTV and refinances around 70%. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.
Ineligible property types. Manufactured homes (single- and double-wide), log homes, and barndominiums are not offered through these programs.
Sub-1.00 coverage. Programs below 1.00 are available through select lenders in the network, with leverage and terms adjusted. Pairing that with a 40-year interest-only structure narrows the field further. Eligibility depends on lender guidelines, credit profile, reserves, and property review.
Honestly, the stronger play is often the plain 30-year fixed if the rental already clears coverage comfortably. For a side-by-side, see this comparison of 30-year fixed and interest-only on a rental refinance.
Frequently Asked Questions
Does every DSCR lender offer a 40-year interest-only loan?
No. It is available through select lenders in a wholesale network, and many programs do not offer it. Property type, loan size, and credit profile also narrow the options. Above $2,500,000, the network generally holds to 30-year fixed structures.
Is the DSCR calculated on the interest-only payment?
It depends on the program. Some test the interest-only payment, which produces a higher ratio. Others test the fully amortizing payment. Ask before you apply, because the same rent can pass one test and miss the other.
Can I do a cash-out refinance into this structure?
Often yes, on programs that offer it, with leverage capped around 75% LTV on a standard rental. About 6 months of seasoning is the common expectation. Taking cash raises the balance, which lowers coverage, so run the ratio before choosing the amount.
What happens when the interest-only period ends?
The payment steps up as the balance begins amortizing over the remaining term. Rent has to cover the new payment, and a future refinance is not guaranteed. Test the post-reset payment against today’s rent before you close.
Does clearing 1.00x mean the rental makes money?
No. DSCR counts rent against PITIA only. Vacancy, repairs, management, utilities, and capital expenses sit outside the ratio, so a property can clear coverage and still run thin.
Next Step
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 mortgage broker that arranges financing through select lenders in its wholesale network across 41 markets, including Washington, D.C. The structure that wins on paper this year still has to survive the month the interest-only clock runs out.
About Lendmire
Lendmire is a non-QM mortgage brokerage (NMLS# 2371349) arranging DSCR investor loans in 41 markets, including Washington, D.C., through wholesale and investor-lending channels. DSCR loans are evaluated by the lender on rental income rather than personal income, subject to lender guidelines — a fit for LLC-owned portfolios, self-employed investors, and operators scaling beyond conventional loan caps. Recognized as a Scotsman Guide Top Mortgage Workplace in 2025 and 2026.
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References
1. Scotsman Guide – Rev Up the Engine for Non-QM Lending
2. Scotsman Guide – The 40-Year Mortgage Gains Traction
3. Fannie Mae – Appraiser Update (Form 1007)
4. Scotsman Guide – A 40-Year Mortgage Poses an Unwelcome Risk
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How to Close a 40-Year DSCR Loan Under an LLC · How a DSCR Loan Works for a Sandusky Seasonal Rental · How a DSCR Refinance Works When a Rental Loan Resets
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.