The Quick Read: To qualify, the duplex’s combined rent must cover its full monthly payment (principal, interest, taxes, insurance and any HOA dues), and you must meet the credit, down payment and reserve tests. The loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. Your wages and debt-to-income ratio are not the test. In Detroit, the property tax bill after you buy is the line most likely to move the number.
- Rent coverage: select programs start at 1.00, and stronger ratios open better pricing and leverage.
- Leverage: most purchases land at 75%-80% LTV on an investment property, subject to lender guidelines.
- Credit: a 620 floor exists in parts of the network, and most programs want around 660.
- Reserves: about 6 months of PITIA is common, and more on larger loans.
- Detroit swing factor: underwrite the uncapped tax bill, not the seller’s.
DSCR stands for debt service coverage ratio. It compares what the property earns to what it costs to carry. For a duplex, it is a clean test, because you have two rent streams against one payment. This guide walks the whole path in order. For the broader picture, see Lendmire’s complete DSCR loans guide.
DSCR Calculator
Run the numbers in your market
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.
Key Terms Defined
DSCR (debt service coverage ratio): monthly rent divided by the monthly housing payment. A 1.20 means rent is 20% larger than the payment.
PITIA: principal, interest, taxes, insurance and any association dues. It is the full payment in the denominator.
LTV (loan-to-value): the loan amount as a percentage of the property’s value. A 75% LTV means a 25% down payment. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.
Market rent: the rent an appraiser says a unit should earn, based on comparable rentals. It can differ from the rent in a lease.
Reserves: liquid cash left after closing, usually counted in months of PITIA.
Seasoning: the waiting period a lender wants between two events, such as owning a property before a cash-out refinance.
What Does “Qualifying” Mean on a Duplex?
You pass three tests: the property, the rent, and the borrower. Fail one and the others do not rescue the file.
The property test is simple. 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. You cannot live in the duplex and use this product.
The rent test is the ratio. Add both units’ rents, divide by the single building payment, and compare the result to what the program needs. Most programs we place files with start at 1.00. That is a floor for select programs, not a universal standard. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted.
The borrower test covers credit, down payment and reserves. Those come after the property clears.
One caution that matters on every file: clearing 1.00 is not the same as positive cash flow. The ratio compares rent to PITIA only. Repairs, vacancy, management, utilities and capital expenses sit outside it.
Which Formula Applies to a Duplex?
For a one-to-four unit rental, the test is rent divided by the full housing payment. That is the version used here. Commercial and multifamily lending uses a different measure, net operating income divided by annual debt service.
You will see both online, which confuses people. They are two tools for two property classes. A duplex is residential, so the simple rent-over-payment version applies.
You may also see 1.25 to 1.50 quoted as the benchmark. That range comes from business-loan lending and does not apply to a rental loan on a duplex. Rental DSCR requirements vary by lender and program, and the figures that matter for this article are the network ranges below.
Does Your Duplex Fit the Program?
Check four things before you write an offer. These are the common points where a Detroit file stalls.
1. Occupancy. You cannot occupy a unit. If you plan to live in one side, look at owner-occupied financing first. Once you move out and the property is a pure rental, DSCR becomes available.
2. Unit count. Two units is a standard duplex.
3. Property type. Manufactured homes, log homes and barndominiums are not offered in the network’s DSCR programs. Detroit’s older brick two-flats are not affected.
4. Loan size. Standard programs run up to $3,000,000. Smaller balances route through select lenders in the network. Detroit duplexes can be inexpensive, so loan size is worth confirming early.
Condition matters too. A duplex that cannot be rented as-is needs a different plan. Rehab-heavy buildings typically need a bridge or rehab loan first, then a refinance once the units are stabilized and leased.
How Does the Lender Count Rent on Two Units?
Each unit gets its own rent figure, and the figures are totaled. Common practice is to compare the lease against the appraiser’s market rent and use the more conservative number.
The appraiser reports rent for each unit. For two- to four-unit properties, the appraisal form is Fannie Mae’s Form 1025, the Small Residential Income Property Appraisal Report. The one-unit rent schedule, Form 1007, is not used for a duplex. DSCR lenders borrow these forms. Your loan is not an agency loan.
| Situation | Typical treatment |
|---|---|
| Both units leased | Lease vs. market rent, per unit |
| One unit vacant | Appraiser’s market rent supports it |
| Both units vacant | Market rent from the appraisal |
| Voucher tenant | Appraiser’s market rent still governs |
Whether a lender credits subsidized rent is a program question. A voucher contract rent does not override the appraiser’s opinion. The Detroit Housing Commission says a voucher unit must meet Housing Quality Standards and that the rent must be reasonable. Reasonableness is judged against comparable units.
So the lease in the seller’s folder is a starting point. The appraisal is the number that usually decides.
Building the Payment Side
The denominator is the full PITIA, and you control more of it than you think. Rent is mostly set by the market. Leverage, insurance and tax planning are choices.
- Principal and interest fall as your down payment rises.
- Taxes are an input, so a good rent-to-price ratio can still fail on a heavy tax bill.
- Insurance varies widely by building age and condition. Get a quote before you offer.
- Association dues apply only if the duplex sits in an association.
A larger down payment lowers the payment and can lift 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.
The Detroit Tax Trap
The seller’s tax bill understates yours. Michigan resets the taxable value after a sale.
Under Proposal A, a transfer of ownership causes the taxable value to uncap in the calendar year after the transfer. The taxable value then becomes equal to the assessed value, and that assessed value is one-half of the assessor’s estimate of market value.
Here is what that does to a listing. A long-time owner may have a taxable value held well below market for years. You do not inherit that. Outlier Media analyzed the tax roll and found Detroit homes would see an average increase of about $1,403 in property taxes if sold today. That is a citywide figure for homes. It is not a duplex number and not an investor-purchase average.
The cause is structural. U-M Detroit says the high effective rate is driven by both high tax rates and low home values. That combination hits cheap duplexes hardest. Cheaper properties may be assessed at a higher share of market value, which makes the tax line proportionally heavier in your denominator.
The practical rule is short. Underwrite the uncapped tax, not the listing’s tax. A pro-forma built on the seller’s bill overstates your coverage. Lenders generally run the full tax figure, so your own math should match.
Worked Examples: One That Passes, One That Falls Short
These use ratios only, as modeled assumptions rather than market data.
A duplex that passes. Say you buy at 75% LTV with a 700 score, and both units are leased. The appraiser’s market rents support the leases. After you build in the uncapped tax and a real insurance quote, combined rent covers the full payment at roughly 1.25x. That clears a 1.00 program with room to spare, which can support better pricing and leverage. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.
A duplex that falls short. Now picture a different building with the same leverage and score. On the seller’s capped tax bill, a quick pro-forma shows coverage near 1.10x, which looks fine. Swap in the uncapped tax and a real insurance quote, and coverage drops to roughly 0.95x. Nothing about the rent changed. The file moved because the denominator did.
You have four levers:
| Lever | Effect on the ratio |
|---|---|
| Larger down payment | Lowers the payment |
| Better insurance quote | Lowers the payment |
| Stronger rent support | Raises the numerator |
| Sub-1.00 select-lender path | Accepts lower coverage, leverage and terms adjusted |
The last row is a real path, but it is a different program. It is available through select lenders in the network, with leverage and terms adjusted. Qualification is subject to lender guidelines, credit approval and property review.
A practitioner note from files like this: the miss is almost never rent. It is the tax and insurance lines, entered from a listing sheet instead of from a post-sale estimate. Fixing those two inputs before you offer saves more deals than any rate conversation.
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 the Borrower Must Show
Across the wholesale network, these are the ranges we see. Programs change, and every file is underwritten individually.
- Credit: a 620 floor exists in parts of the network. Most programs want around 660, and 700 or more unlocks the strongest leverage tiers.
- Leverage on a purchase: most files land at 75%-80% LTV on an investment property, meaning 20%-25% down. Select high-leverage programs reach 85% LTV with roughly a 700 or higher score.
- Reserves: commonly around 6 months of PITIA, stepping up to about 9 months above $1,500,000. Reserves vary by lender, leverage, loan size and transaction type.
- Documents: credit authorization, purchase contract, leases or a rent roll if tenanted, an insurance quote, bank statements for reserves, and entity documents if you close in an LLC, depending on program guidelines.
You do not submit pay stubs or tax returns as the basis for approval. Qualification runs on the property’s income. Note that this is different from saying no paperwork is needed. You still document the property, the entity and your cash.
Detroit Issues That Touch the Loan
Rental compliance. The city issues a Certificate of Compliance after a 15-point property condition inspection. Registration alone does not make a unit rentable. The compliance step is separate.
This is a cost and timing item, not a loan input. It does shape how soon a vacant unit can realistically carry a tenant, so confirm the building’s status early and budget for repairs. A lease may be hard to enforce on an uncertified unit.
Low prices. Inexpensive duplexes can run into minimum loan sizes. Smaller balances route through select lenders in the network rather than standard programs, so ask about this before you fall in love with a very low price.
Rehab-heavy buildings. If units are not rentable on day one, the loan sequence changes. Bridge or rehab money comes first, then a refinance after stabilization.
Out-of-state buyers. Distance does not by itself disqualify a borrower. The file still needs a leased or rentable property and a plan for managing it.
From First Look to Closing
1. Screen the building. Confirm it is a true two-unit, non-owner-occupied purchase with rentable units.
2. Model the real payment. Use the uncapped tax and a live insurance quote.
3. Check your profile. Credit tier, down payment and reserves.
4. Get the loan structured. A broker can compare options across lenders.
5. Order the appraisal. It sets market rent per unit and value.
6. Assemble documents. Leases, entity papers, bank statements.
7. Underwriting. The lender reviews the property, rent, credit and reserves together.
Lendmire is a broker. It arranges DSCR loans through select lenders in its wholesale network, across 41 markets including Washington, D.C. Lenders review eligibility and approve.
Is DSCR the Right Loan?
| Factor | DSCR loan | Conventional owner-occupied |
|---|---|---|
| Reviewed on | Property rent vs. payment | Your income and debt |
| Occupancy | Non-owner-occupied | You live in a unit |
| Entity closing | Possible, per program | Usually personal name |
If you plan to live in one side, start with owner-occupied financing. If it is a pure rental, DSCR usually fits better.
Common Reasons Detroit Duplex Files Stall
- Tax assumed from the listing. Fix: use the uncapped figure.
- Lease rent above market rent. Fix: plan around the appraiser’s number.
- Uncertified or unrentable unit. Fix: confirm status and repair before the appraisal.
- Loan size below standard minimums. Fix: ask about select-lender routing.
- Thin reserves. Fix: document liquid cash before you apply.
- Ratio just under the target. Fix: raise the down payment or reprice insurance.
Frequently Asked Questions
Do I need a minimum credit score to qualify for a DSCR loan on a Detroit duplex?
A 620 floor exists in parts of the network, and most programs want around 660. A score of 700 or higher unlocks the strongest leverage tiers. Exact requirements depend on the lender, leverage and property.
Can I live in one unit of the duplex?
No, not with a DSCR loan. These loans are for non-owner-occupied investment properties. If you want to occupy a unit, owner-occupied financing comes first, and DSCR becomes an option once the property is a pure rental.
Will the lender use my lease or the appraiser’s rent?
Common practice is to compare the two and use the more conservative figure for each unit. Treatment varies by program. Plan your coverage around the appraiser’s market rent, not the lease alone.
What if one unit is vacant?
A vacant unit is typically supported by the appraiser’s market-rent opinion, based on comparable rentals. A unit that cannot be rented as-is, or lacks Detroit’s compliance certificate, complicates the plan.
Can I buy in an LLC?
Often yes, subject to lender program eligibility. Expect entity documents as part of the file.
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. If you are weighing whether the rent alone can carry the file, Lendmire’s piece Can Duplex Rent Alone Qualify You for a DSCR Loan in Detroit? goes deeper.
Detroit’s reset-on-sale tax rules mean the duplex that looks best on the listing is not always the one that clears coverage after closing, so the smartest offer is the one priced against the bill you will actually pay.
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.
Get Started
Ready to find the right loan for you?
See your offer in seconds. No credit pull, no obligation.
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 Selling Guide B4-1.2-01
2. Detroit Housing Commission, Program Participants
3. Michigan Treasury, Changes in Ownership
4. Outlier Media, Detroit property tax bills
5. U-M Detroit, Detroit’s high property taxes
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Should You Use a DSCR Loan to Invest Out of State? · How to Lower Your Loan-to-Value on a Rental Before a DSCR Refinance · Can a Nantucket Rental Qualify for a DSCR Loan on Its Rent Alone?
Guides: DSCR Loans in Detroit, MI · DSCR Loans in Michigan
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
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.