The Quick Read: It depends on the program, because no industry rule fixes which payment a lender tests, but on the interest-only ladder Lendmire places large-balance files with, coverage is qualified on the interest-only payment (interest, taxes, insurance and dues), while short-term-rental income is counted at a discount to gross.
- Interest-only programs in the network qualify on the interest-only payment, subject to underwriting.
- Interest-only runs 120 months on 30- and 40-year terms, to a 75% maximum, with coverage of 0.75 or better.
- Short-term-rental files need coverage of 1.00 or higher and stop at $2,000,000.
- Short-term-rental income counts at 80% of gross, from operating history or the appraisal’s rent analysis.
- A few lenders test the full amortizing payment even on an interest-only loan, so ask before you offer.
Why No Single Answer Exists
No rule sets the tested payment. DSCR loans are business-purpose investor loans, and a lender’s own credit policy decides how coverage is measured. Business-purpose credit, and credit to anyone other than a natural person, falls outside Regulation Z. The consumer payment-testing rules never reach these loans. Whether a transaction is truly for a business purpose is judged case by case, as the official interpretations explain.
Short-Term Rental Calculator
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Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Oct 15, 2026
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Short-term rental income is documented with a 12-month history or a market data report. Program parameters update from Lendmire’s centralized guideline source.
As of Oct 15, 2026 · General Freddie Mac market benchmark, not a Lendmire loan offer. Nightly rate, occupancy, taxes, and insurance are editable estimates. Qualifying income for short-term rentals varies by program — some use appraisal market rent, others use documented STR history or projections — and is confirmed in underwriting. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
So the answer lives in guidelines, and guidelines differ by lender. Across the wholesale network Lendmire works with, most interest-only programs test the interest-only payment. A smaller group tests the amortizing payment instead. A few check both. Lendmire is a broker, so it shops that difference for you. It does not set it.
Key Terms Defined
DSCR: Monthly rent divided by the monthly obligation on the loan.
ITIA: Interest, taxes, insurance and association dues, the payment on an interest-only loan.
PITIA: The same list plus principal, the payment on a fully amortizing loan.
Recast: The point where an interest-only period ends and principal begins.
Operating history: Twelve months of actual booking income from the property.
How the Ratio Changes With Each Payment
Interest-only does not change the formula. It changes the bottom number. Taxes, insurance and dues stay in both versions. Only principal drops out.
| Factor | Tested on ITIA | Tested on PITIA |
|---|---|---|
| Denominator | Interest, taxes, insurance, dues | Adds principal |
| Effect on ratio | Higher | Lower |
| Help at the floor | Real | None from IO |
| Typical use | Most IO programs | A minority of programs |
On a large balance, principal is a bigger share of the payment. The gap between the two tests widens as the loan grows. A luxury file that clears on ITIA can miss on PITIA.
A Worked Luxury Example
Run the numbers on a purchase at the top of the ladder. These inputs are modeled assumptions, not market facts.
1. Start with the appraisal’s short-term-rent analysis. Count 80% of that gross figure as qualifying income. 2. Divide by the interest-only payment. Say that lands near 1.05x, which clears the 1.00 short-term-rental floor. 3. Divide the same income by the fully amortizing payment. The ratio falls well below 1.00. 4. Now test the recast. After a 120-month interest-only period on a 30-year term, the full balance amortizes over the remaining 20 years. The payment steps up, and coverage drifts toward the amortizing result.
The first test clears. The fourth shows what you are really borrowing against. The step-up at recast is real, though its size depends on the loan, so model it for your file rather than trusting a rule of thumb.
Which Payment Will Your Lender Test?
Ask before you pick a property. Lenders in the network fall into three camps.
| Approach | What it means | What to do |
|---|---|---|
| Tests ITIA | IO payment sets coverage | Strongest lift from IO |
| Tests PITIA | IO gives cash flow only | Size the deal on amortizing |
| Tests both | Floor on IO, check on PITIA | Clear both before offering |
Put these questions to every lender or broker:
- Is coverage run on ITIA or PITIA?
- Is the floor different for interest-only and amortizing?
- Are reserves sized on the interest-only payment?
- Does the short-term-rental path allow interest-only at all?
On the program Lendmire places, reserves run six months of ITIA on the subject property (twelve for first-time investors), subject to underwriting. Other programs may size reserves on the full payment even when coverage uses interest-only. That mismatch catches borrowers off guard.
What Changes Under Interest-Only, and What Doesn’t
Interest-only lifts the ratio. It does not relax everything else.
| Item | Changes under IO? |
|---|---|
| Credit floor | No. 660, or 700 above $3,000,000 |
| Appraisals | No. Two above $2,000,000 |
| Leverage | Capped at 75% on interest-only |
| Reserves | Counted on ITIA in this program |
Leverage steps down with size across the ladder. On a purchase, it runs 80% to $1,000,000, 75% to $3,000,000, 65% to $4,000,000, and 60% to $6,000,000 on review, subject to underwriting. Interest-only never goes above 75%. Cash-out is 75% to $1,000,000, 70% to $1,500,000, and 60% to $3,000,000, with none above that.
Short-Term Rental Issues That Interact With IO
Income comes first. On a refinance, lenders use twelve months of operating history. On a purchase, they use the appraisal’s short-term-rent analysis. Both count at 80% of gross. Projection services exist, but only some lenders credit them. A standard long-term rent survey estimates a 12-month lease, so it is not short-term revenue.
Experience matters too. These files are for investors who have owned income property for twelve of the last thirty-six months. They sit on the coverage path of 1.00 or higher and are not available no-ratio.
Then comes permission. 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. Permission is documented per property. Run a second ratio on long-term rent too, as a fallback if short stays are later restricted.
Sub-1.00 coverage does exist through select lenders in the network, and LTV and terms adjust, subject to underwriting. It does not extend to the short-term-rental path, which holds the 1.00 floor.
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.
Reset and Exit Planning
Plan the exit before the offer. A ten-year interest-only window gives you runway, not a permanent ratio. The better coverage lasts only while interest-only does.
Three paths exist at the end of the window: sell, refinance, or hold through the step-up. Each needs modeling today. If you own several interest-only loans, stagger the windows. Resets landing in the same year stack the pain.
Practitioner view from placing large files: the deals that go wrong rarely miss at origination. They clear on interest-only, then get tested by a soft booking year and a recast at the same time. Stress the amortizing payment against a weaker year of revenue before you commit.
When Interest-Only Is the Right Tool
It fits an investor with a clear exit, strong reserves, and a property whose value story justifies thin current coverage. It also suits a portfolio owner who wants cash flow freed for the next acquisition.
It is the wrong tool if the deal only works at optimistic rent. Coverage above 1.00 is a lender test, not proof of positive cash flow, since operating costs sit outside the ratio. If the file clears only on interest-only, treat that as a flag about the property, not a reason to proceed.
Common Mistakes
- Assuming every lender tests the interest-only payment.
- Treating the interest-only ratio as permanent.
- Reading a long-term rent estimate as short-term revenue.
- Sizing reserves on the wrong payment.
- Skipping the municipal permission check.
For the full picture of how these loans work, see the complete DSCR loans guide. A related piece goes deeper: how to qualify a luxury STR with a 10-Year IO super jumbo DSCR loan.
Tax treatment varies; consult a qualified professional. This article is not legal or tax advice, so speak with an attorney or CPA about your own situation. Program figures are typical ceilings through select wholesale programs, subject to underwriting, and are not a commitment to lend.
If you are buying or refinancing a high-balance rental property and want to see how the numbers work, Lendmire can help you compare super jumbo DSCR loan options based on the property income, the loan balance, credit profile, leverage, and investor goals. It arranges business-purpose financing in 41 markets, including Washington, D.C.
Frequently Asked Questions
Is the interest-only or amortizing payment tested?
Most interest-only programs in the network test the interest-only payment. A minority test the amortizing payment even when you pay interest-only, and some check both. Ask each lender directly, because the guideline decides.
Can a short-term-rental file use interest-only?
Often yes, on programs that offer both. The file must still show coverage of 1.00 or higher, with income at 80% of gross, and the loan stops at $2,000,000, subject to underwriting.
Are reserves sized on the interest-only payment?
On the program Lendmire places, reserves are six months of ITIA on the subject property. Lenders may size them on the full payment, so confirm the basis early.
Does the ratio hold after the interest-only period ends?
Not automatically. After 120 months, principal begins and the payment steps up. Coverage drifts toward the amortizing level, so model the recast against a weaker revenue year.
Is a 40-year term the same as 40 years of amortization?
Not always. It can mean a fully amortizing 480-month schedule, or an interest-only period followed by amortization. Check the note and which payment the program tests.
Investors focused on short-term rentals can review DSCR loans for Airbnb and short-term rentals.
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. CFPB, Regulation Z §1026.3, Exempt transactions
2. eCFR, Supplement I to Part 1026, Official interpretations
This article is part of Lendmire’s super jumbo DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Portfolio Loan vs Super Jumbo DSCR for a Luxury STR Operator · How to Qualify for a Super Jumbo DSCR Portfolio Loan for Luxury STR Operators · How to Qualify a Portfolio Luxury Rental Using a 10-Year IO DSCR Loan
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.