The Quick Read: It depends on which limit bites first: on a $400K duplex purchase, most programs lend 75%–80% of the lower of price or appraised value, and only if both units’ rent covers the full monthly payment at 1.00 coverage or better on programs that start there. Leverage sets the ceiling. Rent decides whether you reach it. Credit and reserves decide whether the file clears at all.
- Purchase leverage: typically 75%–80% LTV, which means 20%–25% down. Select high-leverage programs reach 85% LTV with roughly a 700+ score.
- Rate-and-term refinance: the ceiling is 85% LTV on select programs and the strongest files.
- Cash-out refinance: tops out around 75% LTV on standard long-term rentals, with about 6 months of seasoning as the common expectation.
- Rent test: 1.00 is where many select programs start. Stronger ratios open stronger leverage and pricing.
- Credit and cash: most programs want around a 660 score, and reserves commonly run about 6 months of PITIA.
What Actually Sets the Loan Amount?
Two tests set it, and the smaller result wins. The leverage test multiplies the lower of price or appraised value by the program’s LTV cap. The rent test asks whether the duplex’s rent supports the payment on that loan. A DSCR lender never picks a loan amount from the ratio alone. The ratio checks whether a given amount holds up.
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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.
LTV means loan-to-value: the loan as a percentage of the property’s value. DSCR means debt service coverage ratio: monthly rent divided by the full monthly housing payment. That payment is principal, interest, taxes, insurance, and any association dues, known together as PITIA.
There is no government ceiling on these loans. They are non-QM investor loans, so each program sets its own limits. Two investors can buy identical $400K duplexes and walk away with different maximum loans because their rents, credit, and cash differ.
What Does the Leverage Test Say About a $400K Price?
On a purchase, most files land at 75%–80% LTV. That is 20%–25% down. Across the wholesale network Lendmire places files with, a few select high-leverage programs reach 85% LTV, usually with a score around 700 or higher. This article keeps them as percentages on purpose.
| Transaction | Typical LTV ceiling | Down payment |
|---|---|---|
| Purchase, standard | 75%–80% | 20%–25% |
| Purchase, select high-leverage | up to 85% | about 15% |
| Rate-and-term refinance | up to 85% | n/a |
| Cash-out refinance, long-term rental | about 75% | n/a |
Those are ranges, not promises. Each lender’s guidelines, your credit profile, and the property drive the final number.
One detail trips up new buyers: LTV applies to the lower of the contract price or the appraised value. If the appraisal lands under $400K, the lender applies its percentage to the smaller figure. You then cover the gap in cash, or you renegotiate. A thin appraisal hits the leverage test first and the rent test second, because the appraiser also gives an opinion of market rent.
Loan size is rarely the obstacle here. Standard programs run up to $3,000,000, and a $400K duplex sits far below any step-up in reserves or structure.
How Does the Rent Test Work on a Duplex?
The rent test adds both units’ rent and compares the total to one payment. That is the duplex advantage. Two rents carry one set of taxes, one insurance policy, and one loan. A duplex often shows a stronger ratio than a single-family rental at the same price.
Here is the sequence a lender follows:
1. Work out rent used for lender review. This is the rent the lender uses for the math, not the number in the listing. On most programs it is the lower of the in-place lease rent and the appraiser’s market-rent opinion.
2. Total the rent used for lender review for both units.
3. Build the full payment: principal, interest, taxes, insurance, and any association dues. On an interest-only structure, principal drops out of the payment.
4. Divide rent by payment. A result of 1.00 means rent equals the full monthly obligation. Anything lower means rent falls short.
The appraiser’s form matters here. Fannie Mae’s appraisal form guidance lists Form 1025 for two- to four-unit properties and Form 1007 for one-unit rentals only. That makes 1025 the standard small-income form for a duplex. The blank Form 1025 includes a rent schedule that compares each unit’s actual rent to the appraiser’s opinion of market rent. This is only context on how appraisers document rent. It is not a requirement of any DSCR program, and agency loan rules do not govern DSCR files.
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.
Which Limit Wins? Three $400K Duplex Scenarios
These scenarios use a $400K price and DSCR ratios only. The ratios are modeled assumptions, not market data, and every outcome stays subject to lender guidelines, credit approval, and property review.
| Scenario | Leverage | Coverage | What binds |
|---|---|---|---|
| A | 75% purchase LTV | about 1.4x | The leverage cap |
| B | 80% purchase LTV | about 1.05x | Rent, barely |
| C | 80% purchase LTV | below 1.00 | Rent |
Scenario A: leverage binds. Picture an investor buying at 75% LTV with rent covering the payment around 1.4x. The rent could support a bigger loan. The program’s leverage cap says no. To borrow more, this investor needs a program with a higher LTV ceiling and the credit score that goes with it. More rent does nothing here. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
Scenario B: rent barely clears. Say you buy at 80% LTV and the rent lands near 1.05x. On paper the loan works. In practice a small move in taxes or insurance, or an appraiser’s market rent that comes in lower than the lease, can slide the ratio under 1.00. Investors in this spot should run the numbers on the lower of lease rent and market rent before they sign a contract. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.
Scenario C: rent falls short. Now the same 80% request comes in below 1.00. You have options, and none of them is free:
- Put more down. Lower leverage shrinks the payment and lifts the ratio.
- Move to a sub-1.00 program. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted. 1.00 is where many select programs start, and the sub-1.00 path is a separate one.
- Restructure the payment. Select lenders in the network offer interest-only periods and extended 40-year terms. ARM structures also exist for investors who want them.
- Raise the rent. Documented leases that reflect real market rent help, as long as the appraiser’s market-rent opinion agrees.
- Pick a different property. Sometimes the honest answer is a duplex that rents for more.
How Much Cash Does a $400K Duplex Really Take?
Count five buckets: the down payment, closing costs, prepaid items such as insurance and tax escrows, reserves, and any appraisal gap. Down payment gets the attention. Reserves surprise people.
Reserves are liquid funds left after closing. They vary by lender, leverage, loan size, and transaction type. About 6 months of PITIA is common. Conservative rate-and-term files at modest leverage under $1,500,000 can see reserves waived. Loans above that size typically step up to about 9 months. A $400K duplex falls in the first group, but the numbers move with leverage.
At 20%–25% down, a lot of investors keep the extra cash in the bank instead of pushing to a higher LTV. That choice has a real tradeoff. A larger down payment lowers the payment and lifts the ratio. It never erases leverage caps, credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.
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 Rent Do You Need? Back-Solving the Loan
You can work the math in reverse. Start with the payment the loan creates, then ask what rent it takes to hit the program’s floor. If the program starts at 1.00, rent must at least equal the full payment. If you want the cushion that opens stronger pricing and leverage, rent needs to run well above the payment.
Four inputs move the required rent:
- Loan size. A bigger loan means a bigger payment. Leverage does this directly.
- Taxes and insurance. Both sit inside PITIA, so a high-tax county or a costly insurance market raises the rent you need. Budget for them by county.
- Payment structure. Interest-only, longer terms, and fixed versus adjustable all change the payment.
- Rent used for lender review. The lower-of-lease-or-market-rent rule can pull the number below what the listing says.
A duplex with one vacant unit complicates this. Appraisers typically give a market-rent opinion for the empty unit, and lenders often use that figure. A unit rented well under market, though, drags the lease side of the “lower of” test down. Plan for both.
What Changes the Number?
| Factor | Effect on the loan |
|---|---|
| Low appraisal | Shrinks the leverage test and may cut rent |
| Credit score | 620 is a floor in parts of the network. Most programs want about 660, and 700+ unlocks the strongest leverage |
| Higher taxes or insurance | Pushes PITIA up and the ratio down |
| Interest-only period | Lowers the payment on the rent test |
| Short-term rental use | Purchases to 75% LTV, refinance about 70%, cash-out 70% |
| Cash-out instead of purchase | Ceiling drops to about 75% on standard rentals |
A short word on short-term rental duplexes. These programs usually want a 640+ score and about 12 months of hosting history. 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. If that is your plan, Lendmire’s piece How Much a DSCR Lender Will Lend on a Vacation Rental in an LLC goes through that structure. Holding the duplex in an LLC is common, subject to lender program eligibility.
One practitioner point. Across the lenders in our network, the loan amount on a small multifamily deal gets decided at appraisal more often than at application. The listing rent looks fine, then the market-rent opinion comes in lower, and the ratio moves. Investors who check rent comps before they go under contract avoid most of those surprises.
Does Clearing 1.00 Mean the Duplex Cash Flows?
No. DSCR compares rent to PITIA and nothing else. Repairs, vacancy, management, utilities, and capital expenses all sit outside the calculation. A duplex can clear 1.00 and still lose money after a roof repair and two months of vacancy.
That is why many investors treat the lender’s number as a floor, not a target. The lender asks whether the rent covers the loan. You have to ask whether the deal pays you. Tax treatment varies; consult a qualified professional.
Also remember what DSCR loans skip. The loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. Credit, assets, reserves, the appraisal, and entity documents still get reviewed. And these programs do not finance manufactured homes, log homes, or barndominiums. If your duplex is one of those, it falls outside the network’s programs.
DSCR vs. Conventional on a Duplex
| Factor | DSCR loan | Conventional investment loan |
|---|---|---|
| Reviewed on | Property rental income | Personal income and debt-to-income |
| Tax returns | Not the focus of review | Typically required |
| Best fit | Investors with complex or self-employed income | Borrowers with strong Traditional employment income |
| Leverage on a purchase | Typically 75%–80% | Varies by lender |
If your personal income is strong and simple, a conventional loan can make sense. If your income is irregular, or you are adding your fifth rental, DSCR often fits better. Lendmire’s complete DSCR loans guide walks through that choice in detail.
Frequently Asked Questions
Is there an official maximum DSCR loan on a duplex?
No official cap applies, because these loans do not go through government-sponsored channels. Each program sets its own limits. For a $400K duplex, the practical limit is the program’s LTV ceiling and the rent coverage, not a dollar maximum. Standard programs run up to $3,000,000.
Can I live in one unit and still use a DSCR loan?
Usually not. DSCR financing is built for non-owner-occupied investment property. If you plan to live in one unit, a different type of loan generally fits that purchase. Once you move out and rent both units, DSCR becomes a natural option for a later refinance.
What if the appraisal comes in below $400K?
The lender applies its LTV percentage to the lower appraised value, so the loan shrinks. You can bring more cash, negotiate the price, or walk. A low appraisal can also lower the market-rent opinion, which affects the ratio as well.
Does one vacant unit sink the loan?
Not automatically. Lenders typically look at the appraiser’s market rent for an empty unit, and some programs want a signed lease. Coverage can still clear 1.00 with one unit vacant if the numbers allow. Vacancy does cut your margin, so test the ratio both ways.
How much do I need in reserves on a duplex this size?
About 6 months of PITIA is common. Conservative rate-and-term files at modest leverage under $1,500,000 can see reserves waived, and larger loans step up. Reserves vary by lender, leverage, and transaction type.
Ready to Test Your Own Duplex?
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, Lendmire arranges DSCR financing through select lenders across 41 markets, including Washington, D.C. Bring the lease or rent comps, your credit picture, and your cash plan. The leverage and rent tests will show where your $400K duplex lands.
About Lendmire
Lendmire (NMLS# 2371349) is a DSCR-focused mortgage broker that helps arrange investor financing across 41 markets, including Washington, D.C., through wholesale and investor-lending channels. DSCR eligibility is generally reviewed by the lender around the property’s rental income rather than personal income documentation, subject to lender guidelines — which works for self-employed investors, LLC operators, and portfolios above four financed properties. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 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. Fannie Mae’s appraisal form guidance
2. Fannie Mae / Freddie Mac Form 1025 (blank form)
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How a Portfolio DSCR Lender Sizes a Loan Without Tax Returns · How a DSCR Lender Reads a Rental Held Without an LLC or Business License · How Much a DSCR Loan Lends on a Rental Purchase
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- 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.