The Quick Read: A fourplex is tested as one building, so a unit that pays nothing removes its share of the counted rent while the building’s full payment stays put, and in a pool of several buildings that loss gets spread across every payment in the pool.
- DSCR (debt service coverage ratio) is monthly rent divided by the full monthly housing obligation. On four similar rents, one unit counted at zero cuts the ratio to 75% of what it was, so about 1.20x becomes about 0.90x.
- Vacant and unpaid are different states. Many programs count a vacant, rent-ready unit at the appraiser’s market rent, while an occupied unit that is not paying is reviewed on rent actually received.
- In a pool, the ratio change equals the lost rent divided by the pool’s total payment, so adding buildings softens the blow.
- Clearing 1.00 does not mean the building makes money, and treatment of an empty or unpaid unit varies by program, so confirm it before you apply.
What Does Unpaid Mean to a DSCR Lender?
Unpaid covers three different situations, and underwriting treats each one differently. A unit can be vacant, it can be occupied by a tenant who is not paying, or it can be leased below market. The label you use matters less than what the file can document.
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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.
A vacant unit has no tenant. On many programs it is counted at the appraiser’s market rent, provided the unit is rent-ready. Stricter programs count it at zero. Heavy vacancy across a building can push a file toward being treated as unleased. If you want the single-building version of this question, Lendmire’s piece How DSCR Lenders Treat One Vacant Unit in a Fourplex covers it.
An occupied unit that is not paying is the harder case. The lease exists, but the money is not arriving. A lease alone is a promise. Deposits are proof. Across the programs we place files with, the unit gets reviewed on documented, received rent, and the file needs a written explanation. Some lenders will drop it to market rent. Some will treat it as vacant. Some will want the situation cured first.
A below-market lease is paid but low. The lender usually counts the lower of the lease and the appraiser’s market rent. The ratio sees the lease figure.
| Unit state | Counted rent, one possible treatment | Counted rent, stricter treatment |
|---|---|---|
| Vacant, rent-ready | Appraiser market rent | Zero |
| Occupied, not paying | Market rent, with explanation | Zero or treated as vacant |
| Lease below market | The lease amount | The lease amount |
| Lease above market | Market rent (excess ignored) | Market rent |
Treatment is program convention. It is not a rule written down anywhere that binds every lender, which is why the same building can produce two different ratios on two different programs.
Key Terms Defined
DSCR: the debt service coverage ratio. On a one-to-four unit rental it is counted rent divided by the monthly payment, with no operating costs deducted.
PITIA: principal, interest, taxes, insurance, and association dues. It is the full monthly obligation on the building, and it is the bottom number in the ratio.
Counted rent: the rent the lender actually puts in the top of the ratio for each unit. It can differ from what the tenant pays.
Market rent: the rent an appraiser says a unit should command, built from comparable rentals.
Rent roll: a unit-by-unit schedule of tenants, rents, and lease dates.
Pooled ratio: total counted rent across every building in a pool, divided by the total PITIA of those buildings.
Blanket loan: one loan secured by several properties. Trouble in one property can affect the others because they secure the same debt, which is called cross-collateralization.
How One Unpaid Fourplex Unit Moves the Pooled Ratio, Step by Step
Underwriting follows the same path on most files. It runs unit by unit first and then judges the building as a whole. Here is the sequence.
1. Rent evidence is gathered per unit. That means a rent roll, a lease for each occupied unit, and proof the rent was received, such as bank deposits.
2. The appraisal supplies market rent. For two-to-four unit buildings, the appraisal uses Form 1025, which carries unit-by-unit rent and value together. Fannie Mae’s Selling Guide names Form 1025 as the appraisal report for these buildings, and it sits among the forms in Fannie Mae’s appraiser library. DSCR lenders borrow the format only. No agency rule governs how a DSCR file counts an unpaid unit.
3. The lender picks each unit’s counted rent. Leased units usually count at the lower of lease and market rent. Vacant units follow the program’s rule. Rent that cannot be documented is treated as if the unit were empty.
4. The counted rents are added together and divided by the new loan’s PITIA. On a cash-out refinance, the bottom number is the larger new payment, not the old one.
5. The whole building is judged on that one figure, alongside credit, reserves, and condition.
That fifth step is the key idea. A fourplex is one ratio, not four. Each unit does not have to qualify on its own. The unit rents add up on top, and one building payment sits underneath.
The math of a single dark unit is simple. The ratio falls by that unit’s rent divided by PITIA. With four similar rents, each unit is 25% of the top number. Lose one entirely and the ratio becomes 0.75 times the old figure. All figures below are modeled illustrations, not market data.
| Building | Share of rent from one unit | Ratio if base is 1.20x and unit counts at zero |
|---|---|---|
| Duplex | 50% | 0.60x |
| Triplex | 33.3% | 0.80x |
| Fourplex | 25% | 0.90x |
A fourplex absorbs a hit better than a triplex or duplex. More doors dilute each loss. When rents are unequal, the swing depends on how large the missing rent is relative to the payment. A big unit going dark hurts more than a studio.
If the program counts the same unit at market rent instead, the ratio stays near 1.20x. The unit is still empty and still costs you money. The ratio just does not see it. For the full program picture behind these mechanics, the complete DSCR loans guide walks through how rent is tested across property types.
Why Does Pool Size Change the Damage?
The pooled ratio is total counted rent over total PITIA. So one dark unit costs the pool its rent divided by the pool’s combined payment. Add more buildings to the bottom and the same loss shrinks as a share of the whole.
Run the numbers on a modeled pool of identical fourplexes, each sitting at 1.20x on its own. One unit goes to zero in one building.
| Fourplexes in pool | Pooled ratio after one dark unit | Lowest base ratio that stays at 1.00 or above |
|---|---|---|
| 1 | 0.90x | About 1.33x |
| 2 | 1.05x | About 1.14x |
| 3 | 1.10x | About 1.09x |
| 5 | 1.14x | About 1.05x |
Read the last column as a cushion test. A single fourplex needs roughly a one-third rent cushion over its payment to survive one dark door at zero. A five-building pool needs only a thin cushion. The more doors in the pool, the less any one of them matters.
This is where a pool looks attractive. It is also where it gets risky, as the next section shows.
When a Pool Hides a Weak Building
A pool can pass while one building inside it would fail alone. Picture two fourplexes with equal payments. Building A sits at 1.40x and building B at 1.00x. The pool blends to 1.20x and looks healthy.
Now one unit in building B stops paying and counts at zero. Building B falls to 0.75x. The pool lands near 1.075x. The blend still looks fine, but building B is badly under water on its own.
Two things follow from that.
First, some programs apply individual property floors beneath the blended number. A strong building does not always rescue a weak one. Check this before you assume the blend is all that counts.
Second, cross-collateralization means a building in trouble can pull on the others. If the loan is secured by every property, a default problem at one address does not stay at that address. Pooling spreads the ratio risk, but it concentrates the legal exposure.
That tradeoff is real. A pool absorbs one dark door better than a single-building loan does, and it can be harder to unwind when something goes wrong.
Where the General Rule Breaks
The rules above hold on most files. These cases bend them.
An above-market lease adds nothing. The excess over market rent is ignored. A unit with a stale, generous lease can also hurt you. When the program swaps in market rent, the pooled figure drops more than you expected.
Month-to-month and expired leases often fall back to market rent. Proof of paid rent can support the file, since deposits show what is really coming in.
A tenant who stops paying after closing is a different problem. On the files we place, coverage is a test at application and underwriting. What happens afterward is set by the loan documents, so read them. Do not assume the ratio is monitored monthly, and do not assume it is ignored.
An owner who lives in a unit takes the file out of DSCR territory. 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.
Five or more units move into commercial, income-based underwriting. That style nets out vacancy and operating expenses, which a one-to-four unit DSCR file does not.
Short-term rental units are counted on a different basis. Form 1025 does not capture nightly income, and short-term rental files run through their own program with its own leverage and hosting-history requirements. 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.
Ineligible property types stay ineligible. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs, no matter how well the rent covers.
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.
How Does One Dark Door Compare to Other Shocks?
An unpaid unit is the biggest single hit a fourplex can take, but it is not the only one. Here is a modeled ladder from a 1.20x base on a single building.
| Event | Resulting ratio |
|---|---|
| Base case, all four units counted | 1.20x |
| One unit counted at market rent | 1.20x |
| One unit counted at zero | 0.90x |
| Two units counted at zero | 0.60x |
| Appraised rents 10% lower across all units | 1.08x |
| Payment 10% higher | 1.09x |
| Both of the last two together | 0.98x |
A soft appraisal and a payment increase each take a bite. Together they land just under the line. One empty unit at zero does more damage than either alone, and an empty unit at market rent does none at all. This is why the lender’s counting rule matters more than most investors expect.
Dropping below 1.00 does not end the conversation. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted. Qualification is still subject to lender guidelines, credit approval, and property review. For comparison, 1.00 is where many programs start.
What Should an Investor Do Before Applying?
Decide how the unit will be counted before the appraiser walks the building. These steps usually cost the least first.
1. Lease the unit at market, not at a discount. A lease signed just to fill the unit counts at the lease amount if it is lower than market. A cheap lease can leave you worse off than an honest vacancy.
2. Renew below-market leases at market before the appraisal, where the tenant relationship allows it.
3. Get the rent-ready condition documented for any vacant unit. Photos and a clean unit help.
4. Resolve a non-paying tenant first. Cure it, remove the tenant and re-lease, or plan for the unit to count at zero.
5. Ask each program how it counts an empty or unpaid unit before you pick one. Treatment varies, and a broker who sees many lenders can compare them side by side.
6. Lower leverage if the ratio is thin. Typical purchase leverage on an investment property runs 75%-80% LTV, and a cash-out on a standard rental tops out around 75% LTV. A larger down payment lowers the payment and can lift the ratio. It does not erase credit floors, reserve rules, or property eligibility.
7. Check your cushion. Divide 1.00 by your base ratio. If one dark door at zero would drop you under the line, you need a different program, lower leverage, or a pool.
Reserves also matter. Most programs want about six months of PITIA in the bank, and loans above $1,500,000 typically step up to about nine months. Conservative rate-and-term files at modest leverage can see reserves waived, but reserves vary by lender, leverage, loan size, and transaction type. A reserve balance is your backstop for the gap between the ratio and a real month with a dark door.
Credit works the same way. A 620 floor exists in parts of the network, most programs want around 660, and 700 or higher opens the strongest leverage tiers.
Why Clearing 1.00 Does Not Mean the Building Makes Money
DSCR compares rent to PITIA only. Repairs, turnover, management, utilities, and capital expenses all sit outside the calculation. A building at 1.10x can lose money in a bad year.
An unpaid unit makes this worse than a vacant one. The payment keeps running. Taxes and insurance keep running. Operating costs keep running. On top of that, you may be paying legal costs and carrying a tenant relationship that could end badly. The ratio treats the two situations similarly. Your bank balance does not.
Treat the ratio as a qualification test and your own budget as the cash flow test. The strongest files clear both: enough equity and enough rental coverage.
Frequently Asked Questions
Does one non-paying tenant sink a pooled loan?
Usually not by itself. In a pool of several buildings, one dark unit is a small share of total rent. Some programs apply individual property floors beneath the blended ratio, so a weak building can still cause trouble. A pooled loan also carries cross-collateral exposure, which the ratio does not show.
Is an unpaid unit counted the same way as a vacant one?
Not necessarily. A vacant, rent-ready unit is often counted at market rent, while an occupied unit that is not paying is reviewed on rent actually received. Some lenders treat the two alike and count both at zero. Ask the program how it handles each state.
Does the lender look at collections or just the lease?
Both matter. The lease sets the rent that could count, and bank deposits show whether the rent is arriving. A lease without proof of payment is weaker than a lease with a clean deposit history.
What if a tenant stops paying after the loan closes?
That depends on the loan documents, not on the ratio. DSCR is a test at origination on the files we place, but your payment obligation continues regardless. Read the note and any covenant language carefully before you sign.
Does the effect differ on a duplex or triplex?
Yes. One dark unit is 50% of rent in a duplex, 33.3% in a triplex, and 25% in a fourplex, assuming similar rents. The smaller the building, the harder one unit hits the ratio.
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 these loans through select lenders in its wholesale network, across 41 markets including Washington, D.C. Programs change, every file is underwritten individually, and nothing here is a commitment to lend.
About Lendmire
Lendmire, NMLS# 2371349, is a mortgage brokerage focused on investor financing, arranging DSCR loans in 40 states plus Washington, D.C. — 41 markets total. Qualification is based on the property’s income rather than personal income documentation, subject to lender guidelines, making it a fit for LLC-held rentals and scaling portfolios. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
2. Fannie Mae, Appraisers and Property Underwriting
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Current Carrier vs Re-Quote for an Airbnb DSCR Refinance · How to Refinance a Newly Leased Rental With a DSCR Loan · How to Get a DSCR Lender to Use Your Lease Rent
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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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.