The Quick Read: Guest house or ADU rent counts toward coverage only when the unit is legal, separately rentable, and supported by the appraisal’s rent schedule, and even then the ratio is just one of several gates that decide a large-balance rental loan, alongside leverage, credit, reserves, and a second appraisal. The ratio formula does not change at large sizes. What changes is how much rent the property must produce and how much of the file rests on one appraiser’s opinion.
- Coverage is the property’s accepted monthly rent divided by its monthly obligation. Larger loans mean a larger obligation, so rent must rise with price.
- A permitted, rentable ADU can move a file from thin coverage to a comfortable cushion. An unpermitted one is usually left out of rent and often out of value too.
- Leverage steps down as the loan grows, and a second appraisal is required above $2,000,000, subject to underwriting.
- Model every deal twice: once with the secondary unit’s rent and once without it.
Key Terms Defined
Super jumbo is an industry label for a very large loan. No regulator defines it. A jumbo loan is simply one above the conforming loan limit, which Orrick’s summary of the annual limit announcement puts at $832,750 for a one-unit property in most counties, with a high-cost ceiling of $1,249,125. Super jumbo has no fixed starting point. In the programs Lendmire works with, it describes balances well past those limits.
DSCR (debt service coverage ratio) is the property’s monthly rent divided by its monthly obligation. A ratio of 1.00 means rent matches the obligation exactly.
PITIA is principal, interest, taxes, insurance, and association dues. ITIA is the same list without principal, used when a loan is interest-only.
ADU is an accessory dwelling unit: a separate living space on the same lot, such as a garage apartment or a backyard cottage. A guest house is the same idea under a looser name. What matters to a lender is the unit’s legal status, not its nickname.
Rent schedule is the appraiser’s opinion of market rent for the property. It is where the coverage number usually starts.
Haircut is a discount a program applies to an income figure before counting it.
DSCR Calculator
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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 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 15, 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.
What Does Coverage Mean at Super Jumbo Size?
Coverage means the same thing at every loan size. Divide accepted rent by the full monthly obligation. Most programs do not subtract management, repairs, or vacancy from that ratio, so a file can pass the lender’s test and still run thin in real life.
Size changes the picture in two ways. First, price tends to climb faster than rent as properties get more expensive. A luxury home often rents for a smaller share of its value than a modest duplex does, so coverage gets harder to reach at the top of the market. Second, the other gates tighten before the ratio does.
DSCR loans qualify primarily on property-level rental income covering the payment, subject to lender guidelines. Scotsman Guide describes DSCR loans as qualifying on the property’s rent rather than personal income, and it reports that the average non-QM borrower carried a 776 FICO in the most recent year it measured. Non-QM does not mean weak credit.
Across the wholesale network Lendmire places files with, the loan ladder runs from $150,000 to $10,000,000. Lendmire’s standard program stops at $3,000,000, and the larger ladder carries qualified investors past it. Short-term-rental files stop at $2,000,000. Here is how leverage steps down on an investment property at a coverage of 1.00 or better. Every figure is a ceiling through select programs, subject to underwriting.
| Loan band | Purchase (investment property) | Rate-and-term refinance |
|---|---|---|
| $150K–$1M | 80% | 80% |
| $1M–$1.5M | 75% | 75% |
| $1.5M–$2M | 75% | 75% |
| $2M–$3M | 75% | 75% |
| $3M–$4M | 65% | 65% |
| $4M–$6M | 60% on review | 60% on review |
| $6M–$10M | 60% on review | 60% on review |
These bands are loan amounts, not purchase prices. Multiply price by leverage first, then read the band for the resulting loan. Cash-out follows a lower ladder and stops above $3,000,000. Above $4,000,000, every request is reviewed case by case before submission, and it is purchase or rate-and-term only.
Credit is the second gate. The program floor is 660 on loans to $3,000,000 and 700 above that. The top leverage cell in each band needs more. It takes 660 or better for the first band, 700 or better from $1M to $1.5M, and 720 or better from $1.5M to $3M. Above $3,000,000, the top cell needs 700 or better. A lower score drops you to a lower-leverage cell in the same band.
Above $3,000,000, the overlay also requires a clean 0x30x24 housing history and 48 months since any credit event. It is limited to citizens and permanent residents, and it excludes rural property. Acreage is capped at ten acres on a non-rural property.
Reserves are six months of PITIA on the subject property, or twelve for first-time investors. The calculation uses ITIA on interest-only loans. Cash-out proceeds never count toward reserves above $3,000,000. Two appraisals are required above $2,000,000.
These are the gates that often bind before the ratio does. A file with 1.30x coverage and a 680 score can still lose to a file with 1.05x and a 740.
Does Guest House or ADU Rent Count Toward Coverage?
Sometimes. It is never automatic. Whether the rent counts depends on the program, the unit’s legal status, the appraisal, the income evidence, and how the unit will be used. Most programs in the network lean on the appraisal’s determination. If the appraiser does not recognize the unit as a rentable dwelling, the lender rarely will.
| Unit status | Evidence needed | Likely treatment | Risk |
|---|---|---|---|
| Permitted, rentable, leased | Lease, permit, rent schedule | Rent usually counts | Low |
| Permitted, vacant or new | Rent schedule only | Appraiser’s opinion carries it | Medium |
| Legal-nonconforming | Local confirmation, appraisal | Program-dependent | Medium |
| Unpermitted | Permit path to legalize | Often excluded from rent and value | High |
| Short-term guest house | Operating history or STR analysis | Counts at a discount, if allowed locally | High |
| Owner or family use | Written use plan | Usually excluded | High |
Before any ADU rent counts, a lender will want four questions answered. Is the unit permitted or legal-nonconforming? Is it on the same legal parcel as the main house? Do recorded restrictions or association rules limit separate rental? Does the insurance policy cover it as a rented dwelling?
A fifth question catches many files late. How many secondary units sit on the lot? Some programs finance only one ADU, so a property with a main house, a guest house, and a pool cabana needs a program check before anyone orders an appraisal.
How Underwriting Treats the Rent, Step by Step
Step one: pick the income method. The program decides which evidence it accepts: a signed lease, the appraiser’s market rent, or operating history for short-term rentals. Some programs use only the appraiser’s number. Others allow a variance when a lease exists. If your lease and the appraiser’s figure disagree, the lender decides which one governs, and that choice can change your coverage ratio.
Step two: the appraisal sets value and rent. Value drives leverage. Rent drives coverage. The form depends on how the appraiser classifies the property. Fannie Mae’s appraisal forms guide is a useful reference for what the forms are, even though DSCR programs set their own rules. It names Form 1007, a single-family comparable rent schedule, and Form 1025, a small residential income property report for two to four units. It also notes that a one-unit appraisal form can be used when a property includes an illegal second unit or ADU.
Some programs treat a house plus an ADU as a two-unit property. Others treat it as a one-unit property with an accessory structure. The classification changes the form, the rent evidence, and sometimes the eligible leverage. Ask early.
Step three: the ADU gate. The legal-status questions above get answered here. A unit that fails the gate drops out of both rent and value in most programs.
Step four: comps. This is the weak point. Appraisers often struggle to find sales of a house plus ADU, and that gets worse on luxury properties where few similar homes sell. Investors can help by sending sales comps themselves, searching listing language like guest house, casita, and ADU. Treat that as a practical tip, not a rule.
Step five: the second appraisal. Above $2,000,000, two appraisals are required. Two appraisers can reach different conclusions about the secondary unit’s rent and value. Consistency between the property description, the rent schedule, and the sketch matters. When one appraisal supports the ADU and the other ignores it, the file stalls until the gap is resolved.
A Worked Example: Same Loan, Three Ways
Run the numbers on one hypothetical loan with the same monthly obligation in all three cases. The ratios below are modeled assumptions for illustration, not market data.
| Scenario | Rent counted | Coverage read | Result |
|---|---|---|---|
| Main house only | Main house | About 0.92x | Below 1.00 |
| Main house plus permitted ADU | Both units | About 1.21x | Clears 1.00 with cushion |
| Main house plus unpermitted ADU | Main house only | About 0.92x | Below 1.00, value may drop |
In this model the ADU adds roughly 0.29x of coverage. That is the difference between a file that needs a restructure and one that works at full leverage. The third row is the trap. The ADU rent is excluded, and if the appraiser also leaves the unit out of value, the loan-to-value calculation runs on a lower number. That can mean more cash to close.
Rent-to-price compression is why a guest house can matter so much on a luxury property. When the main house rents for a thin slice of its value, a second rentable dwelling can carry a large share of the file. But the guest house cannot rescue everything. If the main house is far from covering the obligation, the ADU’s rent has to be unusually strong, and the appraiser has to support it with comps. That is a lot to ask of one opinion.
Long-Term, Short-Term, or Personal Use?
How you use the guest house changes whether its rent counts and what evidence supports it.
| Use | Income evidence | Treatment |
|---|---|---|
| Long-term tenant | Lease plus rent schedule | Standard rent treatment |
| Short-term rental | Operating history or STR analysis | 80% of gross, 1.00+ coverage |
| Owner, family, or staff | None | Rent usually excluded |
Short-term rental income has no lease to point to. On a refinance, programs that accept it look at twelve months of operating history. On a purchase, they use the appraisal’s short-term-rent analysis. In the network, income is counted at 80% of gross, coverage must reach 1.00 or higher, and the borrower must be an experienced investor. These files stop at $2,000,000 and are not eligible for the no-ratio path. If your loan is larger, the guest house must qualify on long-term rent instead. Lendmire’s piece on whether a super jumbo DSCR loan needs long-term rent above the short-term ceiling covers that tension.
Municipal permission to run a short-term rental must be documented for the specific property. 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. A strong booking history does not override a local ban.
Owner use is the quiet trap. If you, your family, guests, or staff use the guest house part of the year, a lender may exclude its rent altogether or ask for a written use plan. Keep clear records either way. 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.
For the lease question, see Lendmire’s piece on whether a super jumbo DSCR loan uses the old lease or the rent analysis.
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 If Coverage Falls Short?
Work the fixes in order. Each step costs less than the one after it.
1. Confirm the ADU is legal and rentable. If it is, make sure the appraisal captures it. If it is not, ask what legalizing it would take before ordering anything.
2. Check the program match. The wrong classification can drop rent that a different program would count.
3. Lower the leverage. Reducing the loan lowers the monthly obligation and improves the ratio. It also moves you to a better leverage cell.
4. Use interest-only. The network offers a 120-month interest-only period on 30- and 40-year terms, up to 75% leverage. It is reviewed on ITIA instead of PITIA, which lifts coverage because principal drops out of the denominator.
5. Look at sub-1.00 programs. Coverage below 1.00 is a real path through select programs in the network, up to $2,000,000. Leverage and terms adjust, subject to underwriting.
6. Reconsider the structure. A smaller loan, a different property, or a different loan type may fit better. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.
A 1.00x baseline is common because rent covers the payment at that level. Programs that go lower generally ask for more cash down, tighter credit, or different terms. Lendmire arranges these through lenders that review each file individually.
Stress Test: How Much Rent Can Fall?
Cushion matters more than the headline ratio. Take the 1.21x file with the permitted ADU. A 10% rent decline leaves coverage near 1.09x. A 15% decline leaves it near 1.03x. The file breaks 1.00 at a drop of about 17%.
Now take the main-house-only version at 0.92x. It starts below the line, and a 10% decline puts it near 0.83x. The ADU does not just lift the ratio. It builds the room that absorbs a soft rental year or a vacant stretch.
Also stress the ADU itself. If the guest house sits empty for a few months, does the file still hold? If the answer depends entirely on that unit staying rented, the cushion is thinner than the ratio suggests.
Who This Does Not Fit
Super jumbo DSCR fits an investor buying or refinancing luxury rental property who prefers qualification on the property’s rent rather than traditional personal-income documentation, and who may hold title in an entity, subject to program terms with no layered entities. It fits less well in a few cases.
- The property is a second home. Rent generally does not count toward qualifying, and DSCR is for investment properties only.
- The rent cannot carry the file. A strong-income borrower with weak property rent may be better served by a full-documentation jumbo loan, which is reviewed on traditional personal-income documentation and W-2s.
- The income is documented through deposits. A bank-statement loan is reviewed on documented income under the applicable program, subject to lender guidelines.
| Factor | Super jumbo DSCR | Full-doc jumbo | Bank-statement |
|---|---|---|---|
| Qualifies mainly on | Property rent | Traditional personal-income documentation, W-2s | Deposit history |
| Fits | Rental property | Borrower with strong income | Self-employed income |
| ADU rent matters | Directly | Rarely | Rarely |
Many investors mix these. A DSCR loan suits the rental holding. Another loan type may suit the home they live in.
Pre-Application Checklist for Secondary Units
Gather these before the appraisal is ordered, not after.
- Leases, or a rent roll that separates main-house rent from ADU rent.
- Permit and certificate of occupancy evidence for the ADU.
- Insurance showing the ADU as a rented dwelling.
- Entity documents, if closing in an LLC. Eligibility depends on program terms.
- Short-term rental operating history and local permit documentation, if relevant.
- A written statement of who uses each unit and when.
- Any association rules on separate rental.
- Sales comps with listing language like guest house, casita, or ADU.
Order matters. Settling legality and program fit first means you do not pay for an appraisal on the wrong program. In a deal of this size, one appraisal is a meaningful cost, and two are required above $2,000,000.
Across the network, the files that hold together at this size tend to share one habit. The borrower shows up with the unit’s permit, the rent schedule, and a clear use plan before the appraiser arrives. The ones that stall usually have a surprise in the description of the property. An ADU the owner calls a guest house can read as an unpermitted addition once the appraiser sees it.
For more on how the product works overall, see Lendmire’s complete DSCR loans guide.
Frequently Asked Questions
Does an unpermitted guest house count as rent on a super jumbo DSCR loan?
Usually not. Most programs exclude it from both rent and value, and some decline the property outright. In some cases the loan can work on the main dwelling alone. Ask what it would take to legalize the unit before you apply.
Does the required coverage ratio go up at super jumbo size?
The ratio formula stays the same, but leverage, credit, reserves, and appraisal requirements tighten as the loan grows. A file with strong coverage can still be limited by those gates. Coverage at 1.00 earns full leverage for the band, subject to underwriting.
Can a permitted ADU rescue a file with thin main-house rent?
It can help, but there are limits. The appraiser must support the unit’s rent with comps, and luxury ADU comps are scarce. Model the file with and without the ADU. If it only works with the unit’s rent and no cushion, restructure before applying.
Can I count a short-term-rented guest house at its full booking income?
No. Programs that accept short-term income count it at 80% of gross. It requires coverage of 1.00 or higher and an experienced investor. These files stop at $2,000,000, and local permission must be documented for the specific property.
Should I send comps to the appraiser myself?
Often yes, when comparable sales of a house plus ADU are scarce. Search listings for guest house, casita, and ADU, and share them through your lender or broker. This is a practical tip, not a requirement, and the appraiser makes the final call.
Next Step
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. Lendmire is a broker arranging business-purpose financing through select lenders in its wholesale network across 41 markets, including Washington, D.C. Every file is underwritten individually, and nothing here is a commitment to lend.
Lendmire’s self-employed mortgages page presents both super jumbo programs, bank statement and DSCR, side by side.
About Lendmire
Lendmire is a DSCR-focused mortgage brokerage, NMLS# 2371349, placing investor loans across 41 markets, including Washington, D.C. DSCR eligibility is generally reviewed by the lender around a property’s rental income rather than personal income documentation, which fits LLC-held rentals, self-employed investors, and portfolios scaling past conventional financed-property limits.
Scotsman Guide named Lendmire a Top Mortgage Workplace in 2026.
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References
1. Orrick Infobytes: FHFA announces increases to conforming loan limits
2. Scotsman Guide: Which groups are driving non-QM lending
3. Fannie Mae Selling Guide B4-1.2-01
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: How to Refinance 5 to 50 Doors in LLCs on a Super Jumbo DSCR Loan · Can an Investor With 5 to 50 Doors in LLCs Use a Super Jumbo DSCR Loan? · Should Eight Luxury Houses Share One Super Jumbo DSCR Portfolio Loan?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.