The Quick Read: Interest-only and 30-year fixed are payment structures, not competing products. Both can sit on the same short-term rental loan, and the choice changes the payment the lender tests, not the credit or leverage rules the file has to meet.
- Short-term rental purchases typically reach 75% LTV, and refinances and cash-outs typically top out near 70%, subject to lender guidelines.
- Most STR files expect a 640+ credit score and about 12 months of hosting history.
- Coverage starts at 1.00 on both purchases and refinances in select programs.
- Standard programs run up to $3,000,000, and the 30-year fixed is the spine of the network.
- Interest-only periods and extended terms are available through select lenders, not on every file.
This comparison is for investors choosing how the loan gets paid. Lendmire is a mortgage broker that arranges DSCR investor loans through select lenders in its wholesale network, across 41 markets including Washington, D.C. Programs change, and every file is underwritten individually. Nothing here is a commitment to lend.
Short-Term Rental Calculator
Run the STR numbers in your market
Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Oct 15, 2026
Prefilled with starting assumptions — enter your nightly rate, occupancy, taxes, and insurance for a more accurate picture.
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.
Side-by-Side
The 30-year column reflects the network’s standard structure. The interest-only column reflects published industry norms for add-on interest-only periods, which vary by lender and program.
| Factor | 30-Year Fixed | Interest-Only Period |
|---|---|---|
| What it is | Principal and interest from day one | Interest-only first, then amortizes |
| Review basis | Property rent against PITIA | Rent against the tested payment |
| Which payment is tested | Full PITIA | Varies by program |
| Documentation | Appraisal, STR income evidence, entity papers | Same file contents |
| Property types | Standard eligible types | Same eligibility |
| Entity vesting | LLC allowed, subject to program terms | Same |
| Equity build | Principal paydown each month | Appreciation only during the window |
| Reserve expectations | Set by lender, leverage, loan size | Not automatically relaxed |
| Availability | Network standard | Select lenders only |
| Main risk | Tighter coverage on larger balances | Payment step-up at recast |
What Is Actually Being Compared
A DSCR loan describes how the borrower qualifies. Interest-only and amortizing describe how the note is paid. The loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines, and no W-2s or traditional personal-income documentation drive the decision.
An interest-only period is normally added to a 30-year note. The first stretch pays interest alone. Then the balance amortizes over the remaining years. A “40-year” structure is usually a 10-year interest-only stretch plus 30 years of amortization. It is not 40 years of straight principal paydown. Investor education resources, such as BiggerPockets, describe the same pattern, though such material can be dated, so treat it as background only.
DSCR is monthly rent divided by the housing payment: principal, interest, taxes, insurance, and association dues. On interest-only, the principal piece drops out. Rent stays the same, so the ratio is mechanically higher. Here’s the catch: clearing 1.00 does not mean the property cash flows. Repairs, vacancy, management, utilities, and capex all sit outside the calculation.
Loan Amounts on STR Files
Standard programs run up to $3,000,000, and smaller balances route through select lenders in the network. Above $2,500,000, the network generally holds to 30-year fixed structures. So the largest STR loans are the least likely to get an interest-only period.
Leverage caps the amount before DSCR does. An STR purchase typically goes to 75% LTV on the strongest files. A refinance or cash-out typically tops out around 70%. These are STR-specific ceilings. A standard long-term rental can reach higher on a purchase, so never carry an LTV figure from one property type to the other.
Credit and reserves ride along. STR files typically want a 640 score or better. Reserves vary by lender, leverage, loan size, and transaction type, and commonly sit around six months of PITIA. Larger balances step up from there. Choosing interest-only does not reduce those requirements on its own.
A bigger down payment lowers the payment and can lift the ratio. It never erases the leverage cap, the credit floor, or reserve rules. The strongest files clear both tests: enough equity and enough rental coverage.
How STR Income Gets Counted
Evidence comes in two forms. On an existing STR, expect about 12 months of platform statements or property-management data. The agency forms behind that analysis are Form 1007 for one-unit properties and Form 1025 for 2-4 units. They are named for context only, because DSCR loans are not agency products.
Seasonality matters more here than on a 12-month lease. A beach house can earn far more in July than in January, so lenders want full-year performance or solid market data behind any projection. A thin qualifying ratio leaves little room for slow months. 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.
Coverage floors differ by program. The network’s STR programs start at 1.00 on purchases and refinances. Some market commentary calls 1.25 strong. That is a cushion benchmark, not a requirement. Separately, select lenders in the network offer paths below 1.00, with leverage and terms adjusted.
When 30-Year Fixed Is the Better Fit
Choose the fully amortizing note when the property is a long hold. The payment is stable, the balance falls every month, and the ratio you qualify on is the ratio you live with.
It also fits larger loans. Above $2,500,000 it is generally the only structure in the network. And it fits thin-margin STRs. If the property only clears coverage on an interest-only payment, the recast will hurt. A file that clears 1.00 on the full amortizing payment has no step-up waiting for it.
Consider a purchase at 75% LTV on a lake-town cabin with 12 months of host history and a ratio near 1.1x on the full payment. That is a clean 30-year file. There is no recast to stress-test, and equity builds with each payment. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.
The tradeoff is real. The fully amortizing payment is higher, which shrinks the ratio on identical rent. On a property with haircut STR revenue, that can push a deal under the floor.
When Interest-Only Is the Better Fit
Interest-only fits a defined plan: a short hold, a renovation-then-refinance, or a sale before the window ends. It lowers the early payment and raises the ratio on the same rent. For an STR, that matters because revenue adjustments already shrink the numerator.
Run the numbers on a property that sits just under the floor on the amortizing payment. On interest-only, the same rent can clear it. That is a legitimate use. It is not a sign of a weak borrower. It is also not a way around credit, leverage, or reserve rules.
Three cautions apply. First, which payment qualifies varies by program. Some test the interest-only payment. Others test the amortizing payment even when you pay interest-only. Confirm which one before you build a deal around it. Second, the payment steps up at recast on an unchanged balance. Test the ratio on that post-window payment too, at the property’s seasonal low. Third, you build equity only through appreciation during the window, so your exit depends on refinancing or selling.
Interest-only and extended terms are available through select lenders in the network, not on every file. Maturity, interest-only expiration, and any balloon all need to be read from the note itself. A “30-year” label can describe maturity, amortization, or both.
An ARM is the third path. Adjustable structures exist for investors who want them, and the same two tests apply: the tested payment, and the payment after adjustment.
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.
Entity and Documentation Friction
Most STR files vest in an LLC, subject to program terms. Entity documents, operating agreement, and guaranty need to be in order before the file goes to the lender. A mismatch between the entity on the contract and the entity on the insurance binder is a routine preventable gap.
Insurance deserves its own check. STR policies differ from long-term rental policies, and a quote that covers a standard landlord policy may not match the use. Pull a fresh binder that matches how the property is actually rented. Also line up the platform statements, the appraisal with its rent or STR analysis, and reserves verification.
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. Under the CFPB’s Regulation Z business-purpose rule, purpose is judged in substance. Interest-only versus amortizing does not change that treatment.
Choosing Between Them
Practitioners across the network tend to sort it by hold period and margin:
- Long hold, steady cash needs, or a loan above $2,500,000: 30-year fixed.
- Short hold, planned refinance, or a ratio just under the floor: interest-only, where a select lender offers it.
- Seasonal income with thin coverage: size the loan so it clears on the full payment, and treat interest-only as a bonus, not the plan.
One file pattern shows up often. The investor is reviewed on interest-only, then discovers the property can’t carry the recast in off-season months. The fix is to run both payments before choosing. The complete DSCR loans guide covers qualification from the start.
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.
The Verdict
Neither structure is better in the abstract. The 30-year fixed is the dependable default: stable, building equity, and available at every loan size in the network. Interest-only is a tool for investors with a plan for the recast and enough margin to survive it.
The honest test is simple. If the property clears coverage on the full amortizing payment, take the stability. If it only clears on interest-only, the deal is thin, and the exit better be firm.
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. Call 828-256-2183 or request a quote.
Frequently Asked Questions
Is a DSCR loan the same as an interest-only loan?
No. DSCR describes how the file qualifies, using property rent against the housing payment. Interest-only describes how the loan is paid. An interest-only period can be added to a DSCR loan through select lenders, and an interest-only mortgage can also be qualified on personal income.
What is the most I can borrow on an STR DSCR loan?
Standard programs run up to $3,000,000, subject to lender guidelines. Leverage usually binds first: typically up to 75% LTV on an STR purchase and around 70% on a refinance or cash-out.
Does a 40-year DSCR loan mean 40 years of amortization?
Usually not. A 40-year structure is typically a 10-year interest-only stretch followed by 30 years of amortization. Extended terms and interest-only periods are available through select lenders, and the note shows the maturity, the interest-only expiration, and any balloon.
Does interest-only change credit or reserve requirements?
Not automatically. STR files typically want a 640+ score and about 12 months of hosting history regardless of structure.
Which payment do lenders use to test coverage?
It varies by program. Some test the interest-only payment while it is in effect. Others test the fully amortizing payment even if you pay interest-only. Ask which applies before you rely on interest-only to clear the 1.00 floor.
Investors focused on short-term rentals can review DSCR loans for Airbnb and short-term rentals.
About Lendmire
A DSCR-focused mortgage broker, Lendmire (NMLS# 2371349) places investor financing across 41 markets — 40 states plus Washington, D.C. — with DSCR eligibility generally reviewed by the lender on property cash flow instead of tax returns, subject to lender guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in 2025 and 2026.
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References
This article is part of Lendmire’s short-term rental loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: In an LLC 40-Year DSCR Loan vs Delayed Financing · How an STR DSCR Loan Treats a Management Company’s Cut · How to Qualify for a DSCR Loan in Massachusetts
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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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.