The Quick Read: Yes, a San Juan Islands rental can qualify for a DSCR loan, because the loan tests the property’s rent against its monthly obligation and an island address does not disqualify it, but only when the rental income is legal, documentable, and the home can be appraised and insured, subject to lender guidelines. The loan is rarely the hard part. Whether the rental is legal usually is. A rental with no valid permit should be underwritten on long-term rent, or not counted at all.
- Long-term rentals are the simplest island case. Lenders can underwrite them on a lease or a market-rent appraisal.
- Short-term rentals need a valid county permit before their income counts.
- Leverage, credit, reserves, and property type still apply on islands, as they do everywhere.
- Clearing the coverage test is not the same as earning positive cash flow.
How Does a DSCR Loan Work on an Island Property?
A DSCR loan, short for debt service coverage ratio, divides the property’s monthly rent by its full monthly obligation: principal, interest, taxes, insurance, and any HOA dues. That obligation is called PITIA. The loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines, so your personal income is not the focus.
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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 own rent or nightly figures, taxes, insurance, and HOA 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. Rent, nightly rate, occupancy, taxes, and insurance are editable estimates. Short-term rental figures are estimates only and vary significantly by season, property type, management approach, and local short-term-rental rules — confirm local regulations before relying on them. 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.
Nothing in that math cares whether the property sits on a mainland street or a ferry-served island. What changes is the evidence. The lender needs proof that the rent is real and legal, an appraisal that supports the value and rent, and insurance that will cover the home. For the full mechanics, Lendmire’s complete DSCR loans guide walks through the basics.
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.
Why Does the Permit Matter More Than the Ferry?
The permit is the gating item because short-term rental income only helps your file if the rental is legal. San Juan County requires a permit to rent a single-family home or accessory dwelling unit for short-term stays. The county’s vacation rental page says advertising or operating without one carries a $2,300 penalty, and ads must show the permit or compliance number.
Permits are also capped per island. New permits are scarce, so most buyers are really buying an existing permit along with the house.
That cuts both ways. A valid, transferable permit can make a property more valuable.
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.
How Do You Confirm a Rental Is Legal Before You Buy?
Confirm it before you make an offer, not at appraisal. A lender cannot count income the law does not allow, and a deal that looks strong on paper can fall apart on this one fact. Work through this order:
1. Ask the seller for the permit number or compliance number. A listing that says “vacation rental” is not proof.
2. Ask county staff to confirm the permit is active. Check that annual compliance filings are current and that the permit covers the bedroom count being advertised.
3. Ask whether the permit transfers on sale. Get the answer in writing from the county, not from the listing agent.
4. Check the plat’s CC&Rs and any HOA rules. Private covenants can be stricter than county code.
5. Check town rules if the property sits inside Friday Harbor. The town has its own rules, so verify with both the county and the town.
6. Share the results with your broker before the appraisal. The lender can then choose the right income basis.
Do this during due diligence. If the answer is no, you want to learn it while you can still walk away.
Does Each Island Work the Same Way?
No. The county sets different caps by island, and two islands do not allow short-term vacation rentals at all. This table summarizes the county’s published figures.
| Island | Short-term permit cap | DSCR income basis if no permit |
|---|---|---|
| San Juan Island | 337 | Long-term rent |
| Orcas Island | 211 | Long-term rent |
| Lopez Island | 135 | Long-term rent |
| Outer islands | 10 | Long-term rent |
| Shaw and Waldron | Not allowed by ordinance | Long-term rent only |
Eastsound Village Commercial properties are treated differently and do not need the same permit, but they must still meet county requirements. Confirm any exception with the county before you rely on it.
What Does the Income Basis Change?
The income basis you use can move the same house from borderline to comfortable. Here is a modeled example, not a market fact. Picture one island home with a valid, transferable permit, and run it two ways.
| Scenario | Income lender can count | Likely coverage |
|---|---|---|
| Permitted short-term rental | Trailing 12-month rental history | Roughly 1.3x |
| Same home on long-term rent | Lease or market-rent appraisal | Roughly 1.05x |
| Unpermitted short-term rental | Long-term rent only | Roughly 1.05x |
| Shaw or Waldron home | Long-term rent only | Roughly 1.05x |
Those ratios are assumptions chosen to show the shape of the decision. The permitted short-term version clears 1.00 with room to spare. The long-term version clears it narrowly. If the permit turns out to be invalid, the stronger number disappears, and the file has to stand on the lower one.
Seasonality matters here too. Island demand runs heavily in the warm months, so a trailing 12-month figure is more defensible than a few peak months.
What Will the Lender Still Ask For?
Even a strong coverage ratio does not erase the other tests. The strongest files clear both: enough equity and enough rental coverage. Across the wholesale network Lendmire works with, the typical ranges look like this, subject to lender guidelines and every file being underwritten individually:
- Leverage: most purchase files land at 75% to 80% LTV on an investment property, meaning 20% to 25% down. Select high-leverage programs reach 85% LTV with roughly a 700+ score. Cash-out refinances top out around 75% LTV across most of the network.
- Credit: a 620 floor exists in parts of the network. Most programs want about 660, and 700+ unlocks the strongest leverage tiers.
- Reserves: commonly around 6 months of PITIA, stepping up to about 9 months on loans above $1,500,000. Conservative files at modest leverage can see reserves waived.
- Loan size: up to $3,000,000 on standard programs.
- Coverage: 1.00 is where many select programs start. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted.
A larger down payment lowers the monthly obligation and can lift the ratio. It never overrides a credit floor, a reserve rule, or a property restriction.
Property type matters on islands. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs. Some island and rural properties fall in those categories, so check the construction type early.
The appraisal is also where thin island comps can show up. For a long-term rental, expect a rent schedule on the appraisal (the form is commonly called a 1007), and for small multi-unit properties an income-focused appraisal (a 1025). Island comps can be sparse, which makes a good appraiser and realistic expectations worth more than optimism.
What If the Permit Isn’t There?
Underwrite the property as a long-term rental. This is the fallback that keeps many island deals alive. The lender counts lease income or the appraiser’s market rent, and the short-term story becomes upside you cannot bank on.
If long-term coverage lands under 1.00, there are still paths. Programs below 1.00 are available through select lenders in the network, with leverage and terms adjusted. No-ratio structures are available only through select lenders, generally for borrowers who already own a primary residence. Expect more cash down and different terms either way.
If the numbers only work with short-term income and no permit exists, the honest answer is to pass or renegotiate. Do not build a purchase on income the county will not let you earn.
Two other details are worth knowing. A tenancy of 30 days or more is treated differently from a vacation stay, and switching a property between uses needs clean documentation. Also, if a home has two dwellings on one lot, ask the county how a short-term permit applies to each before you count on either.
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.
Does Passing the Test Mean the Deal Pays?
No. DSCR compares rent to PITIA only. Repairs, vacancy, management, utilities, and capital expenses sit outside the calculation, so clearing 1.00 is not the same as positive cash flow.
Islands add a logistics layer. Access is by ferry, and disruptions happen. During one recent crew shortage, KUOW reported that 13 of 18 vessels were out of service, with service largely restored by the next morning. That does not change loan eligibility. It does affect contractors, guest turnover, and what you can realistically earn in slow months.
Tax treatment varies; consult a qualified professional.
Key Terms Defined
DSCR: the ratio of a property’s monthly rent to its full monthly obligation. Above 1.00 means rent covers the payment on paper.
PITIA: principal, interest, taxes, insurance, and association dues. It is the monthly obligation the rent is measured against.
LTV: loan-to-value, the loan amount as a percentage of the property’s value.
Reserves: liquid cash you hold after closing, usually counted in months of PITIA.
Certificate of compliance: the annual county filing that keeps a short-term rental permit in good standing.
Frequently Asked Questions
Can I use short-term rental income to qualify on a San Juan Islands home?
Yes, if the rental is legal and the permit is valid. On a purchase, short-term rental programs go up to 75% LTV, and refinances sit around 70%. Expect a 640+ credit score and about 12 months of hosting history. Short-term rental purchases start at 1.00 coverage, and short-term rental refinances also start at 1.00. Without a valid permit, income is limited to long-term rent. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.
Is a DSCR loan harder to get on an island than on the mainland?
Not because of the location itself. The ratio is calculated the same way. The extra friction comes from permit verification, thinner appraisal comps, and insurance, all of which you can check before making an offer.
What happens if the permit does not transfer to me?
Then the short-term income cannot support your loan. The file falls back to long-term rent, which usually lowers the ratio. Get the transfer answer from the county in writing before you rely on it.
Does a DSCR loan qualify a log cabin or manufactured home on an island?
No. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs, regardless of location or rent.
How much do I need down?
Most purchases fall at 75% to 80% LTV, which means 20% to 25% down. Reserves are separate and commonly about 6 months of PITIA.
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. As a broker arranging financing through select lenders in its wholesale network across 41 markets, including Washington, D.C., Lendmire can review your scenario before you write an offer. This is not a commitment to lend.
Island rentals reward buyers who check the permit first and the ratio second.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage brokerage specializing in DSCR investor loans, helping arrange financing across 41 markets, including Washington, D.C., through wholesale and investor-lending channels. The model centers on property-level rental income reviewed by the lender rather than W-2 documentation, subject to lender guidelines, suiting entity-owned and multi-property investors. Lendmire holds Scotsman Guide Top Mortgage Workplace recognition for 2025 and 2026.
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Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. San Juan County, Vacation Rentals Information
2. KUOW: Ferry Service Snarled Across Puget Sound Region
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Can You Get a DSCR Loan on a Vacant Rental With No Lease? · Is a 40-Year DSCR Loan Worth It on a Rental? · Can a Trust Hold Title on a DSCR Rental Loan?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
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- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
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.