How to calculate DSCR: the formula, a worked example, what counts as good, and DSCR loans

Blog · June 7, 2026 · 14 min read

By TrueCap · built by a Philadelphia rental investor

DSCR = NOI ÷ annual debt service. It tells you whether a rental's operating income covers its loan payments, and it's the ratio a DSCR loan qualifies on. This guide works one property through the formula with TrueCap's calculator, shows where the common 1.25 floor comes from, and explains how DSCR loans work, including why a lender's DSCR can come out higher or lower than yours.

The DSCR formula

DSCR = Annual NOI ÷ Annual debt service

NOI = gross rent − vacancy − operating expenses (before the mortgage)

DSCR (debt service coverage ratio) compares what a property earns from operations with what its loan costs. At 1.00, net operating income exactly covers the payments. At 1.25, NOI is 25% more than the debt service. Below 1.00, the property doesn't earn its own mortgage and the difference comes out of your pocket.

Two edge cases. With no loan there's no debt service and no denominator, so DSCR on a cash purchase is undefined: TrueCap shows it as N/A — no debt service. And when NOI is negative, DSCR is negative too: a financed deal that loses money before the mortgage shows a negative ratio, not zero.

How to calculate DSCR in four steps

Step 1: Compute NOI

Start with a year of scheduled rent. Subtract a vacancy allowance, then the operating expenses: property taxes, insurance, maintenance, management, utilities you pay and HOA dues. Leave the mortgage out. TrueCap keeps the CapEx reserve below the NOI line: it lowers your cash flow but not NOI or DSCR. Whichever convention you use, use it every time. The full walkthrough is in how to calculate NOI.

Step 2: Compute annual debt service

Monthly principal and interest × 12. Some DSCR programs use PITIA instead: principal, interest, taxes, insurance and association dues (Fannie Mae's Selling Guide lists every component). A larger denominator gives a lower ratio, so ask which one the lender uses before you run the numbers. TrueCap's mortgage payment calculator shows the monthly principal and interest on its own line, next to taxes and insurance.

Step 3: Divide

NOI ÷ annual debt service = DSCR. Round to two decimals, and ask the lender how it rounds: 0.996 is below 1.00 even when it displays as 1.00.

Step 4: Compare with the written program

Get the lender's formula, minimum ratio, accepted rent evidence and leverage limits in writing.

Worked example: TrueCap's sample rental

These figures come from TrueCap's calculator, run on the sample rental the analyzer loads, where you can change any input: a $265,000 single-family house renting for $3,050 a month, bought with 20% down and a 30-year loan at 6.6%. The tax and insurance rates are the sample's assumptions; on a real deal, use the property's own tax bill and quote. The calculator rounds each monthly expense to the dollar, so each annual line below is its monthly figure × 12.

Gross rent: $3,050 × 12 = $36,600
Vacancy (5% of rent, $153 a month): −$1,836
Property taxes (1.49% of price, $329 a month): −$3,948
Insurance (0.5% of price, $110 a month): −$1,320
Maintenance (5% of rent, $153 a month): −$1,836
Management (8% of rent, $244 a month): −$2,928
NOI: $24,732
Loan: $212,000 at 6.6% for 30 years = $1,354 a month principal and interest
Annual debt service: $16,247

DSCR = $24,732 ÷ $16,247 = 1.52

The property earns about $1.52 of NOI for every $1.00 of loan payment. The sample also sets aside a 5% CapEx reserve ($153 a month). Because that sits below NOI, it lowers the cash flow (about $554 a month here) but not the DSCR.

Solve it backwards: what 1.25 allows

Divide NOI by a target ratio to get the most debt service it supports: $24,732 ÷ 1.25 = $19,786 a year ($1,649 a month). At 6.6% over 30 years that pays for a loan of about $258,000, 97% of the price. So on this property the ratio isn't what limits the loan; the maximum loan-to-value is. Each DSCR lender's matrix sets its own; for a conventional one-unit investment purchase, Freddie Mac's cap is 85%.

On a thinner deal the ratio binds. Take the harshest case from the stress test below: rent 10% lower ($2,745) and a rate a point higher (7.6%). NOI falls to $21,744 against $17,963 of debt service, a DSCR of 1.21. At 1.25 the debt service can be at most $21,744 ÷ 1.25 = $17,395 a year, a loan of about $205,000. That takes about $60,000 down (23%) instead of $53,000. Or keep 20% down and pay less: the calculator reaches 1.25 at a price of about $258,000, $7,000 under the $265,000 in the example.

TrueCap Pro's Offer Ceiling runs the price version for you: the highest price that still meets your targets, including a DSCR you set.

What is a good DSCR?

Above 1.00, NOI covers the debt under your formula. How far above is your cushion against a vacant month, a repair or a tax increase. As a lender screen, 1.25 shows up in two published multifamily standards, and HUD goes lower:

Freddie Mac's Optigo fixed-rate multifamily term sheet sets a 1.25x minimum amortizing DCR for every loan term, and notes that adjustments may be made depending on the property, product and market.
The federal risk-retention rule, 12 CFR 244.17, requires a DSC ratio of 1.25 or greater for a multifamily loan (five or more dwelling units) to count as a qualifying loan, 1.5 for a leased commercial property and 1.7 for other commercial real estate.
HUD's 221(d)(4) program goes lower: Mortgagee Letter 2026-01 lists 1.15 for market-rate projects and 1.11 for its middle-income option.

All three are multifamily and commercial standards. For a house or a duplex, Fannie Mae's Selling Guide counts the rent as a net dollar figure rather than a coverage ratio (see below), and each DSCR lender or program sets its own minimum coverage threshold. Some programs allow lower coverage with different leverage, reserves, pricing, or property restrictions.

DSCR	What it tells you
Below 1.00	NOI doesn't cover the loan payments under this formula; you cover the gap.
1.00 – 1.15	Covers the debt with little room. Treat it as a yellow zone: acceptable only with a specific plan to raise rents or refinance.
1.15 – 1.25	Some cushion, but under the 1.25 floor of the multifamily standards above.
1.25 – 1.50	At or above that common floor. Stress-test it before you rely on it.
Above 1.50	A wide cushion (the sample is 1.52). Check whether a large down payment is what produces it.

Where you buy changes how hard 1.25 is

At the same price, rate and down payment, more NOI per dollar of price means a higher DSCR. Rent against price is a rough market proxy. HUD's housing market analyses put the average apartment rent at $1,125 a month against an average existing-home price of $265,000 in the Memphis area (about 0.42% of price per month, as of June 1, 2024), and $1,572 against $594,800 in the Phoenix area (about 0.26%, as of January 1, 2025). Apartment rents set against all home sales aren't any one property's yield, but the gap shows why the same 1.25 takes more equity in some metros. See the Memphis and Phoenix rental market data for HUD's Fair Market Rents there.

When a DSCR under 1.25 can still work

A rent path you can document. Tenants below market with leases ending soon. Underwrite the turnover cost and the timeline, not just the new rent.
A value-add you control. BRRRR and rehab deals are judged on the stabilized DSCR. Be honest about which number the lender will see at refinance (the BRRRR method walks through it).
A house hack. If you'll live in one unit, measure the deal against the rent you pay now, not against a DSCR.

Hope isn't on the list. A 1.05 with no plan pays its mortgage only when nothing goes wrong.

Your DSCR vs the lender's DSCR

Your DSCR and a lender's can come out higher or lower than each other, because the formula and the accepted rent can differ. Three versions on the same sample rental:

Your operating DSCR, NOI ÷ principal and interest: 1.52.
Rent ÷ PITIA: $3,050 ÷ $1,793 = 1.70. PITIA here is $1,354 of principal and interest, $329 of taxes and $110 of insurance.
NOI ÷ PITIA: 1.15. This one counts taxes and insurance twice, because NOI has already paid them. If a lender quotes it, ask whether its numerator is gross rent or NOI.

Some DSCR programs compare rent to PITIA rather than using the investor's NOI-based ratio. Ask the lender for its written formula and rebuild it next to your own number, not instead of it: a rent-to-PITIA ratio leaves out vacancy, maintenance and management, so the lender's 1.70 can pass a property whose operating DSCR is thin. The lender is underwriting its own downside, not your return.

Conventional loans count a rental differently again. On a purchase, Fannie Mae's Selling Guide takes 75% of gross rent and subtracts PITIA: a net dollar figure that feeds your debt-to-income ratio, not a coverage ratio. On the sample that's 75% × $3,050 − $1,793 = about $495 a month.

The rent can differ too. A lender may take it from the appraisal rather than your lease or estimate; Fannie Mae's form for a single-family rental is the Single-Family Comparable Rent Schedule (Form 1007). Before you lock a rate or pay non-refundable fees, ask which rent the lender will use, whether a signed lease or the appraiser's figure wins, and how it handles a request to reconsider the value if the appraised rent comes in low.

DSCR loans: how lenders use the ratio

A DSCR loan is an investor loan that qualifies mainly on the property's coverage ratio instead of your personal debt-to-income ratio. The legal backdrop: Regulation Z treats credit to buy, improve or maintain a rental property you don't occupy as business-purpose credit, outside its consumer rules, including the ability-to-repay and qualified-mortgage requirements. That's why you'll see DSCR loans called non-QM. (A property you'll live in for more than 14 days in the coming year counts as owner-occupied, and different rules apply.)

How it differs from a conventional investment loan

Fannie Mae and Freddie Mac loans qualify you, not the property:

Income. Documented income and a debt-to-income ratio: Fannie Mae's maximum is 50% for loans run through Desktop Underwriter, and lower for manual underwriting.
Credit. Fannie Mae sets no minimum credit score for loans run through Desktop Underwriter; a manually underwritten loan needs 620 for a fixed rate or 640 for an ARM.
Borrower. Fannie Mae buys loans made to borrowers who are natural persons, with narrow exceptions for certain trusts, so a loan to your LLC is outside the program.
Portfolio. Fannie Mae allows up to 10 financed properties for a second-home or investment loan run through Desktop Underwriter.
Leverage. Freddie Mac allows up to 85% LTV on a one-unit investment purchase and 75% on 2–4 units, and 75% and 70% on a cash-out refinance.

A DSCR program swaps the income test for the property test. Each lender sets the rest in its own matrix.

Who compares DSCR loans

These are reasons to get a DSCR quote, not proof it's the right or cheapest loan.

Self-employed with paper losses. Depreciation and business deductions lower taxable income (depreciation is a rental deduction under IRS Publication 527). Conventional programs apply their own income rules; a DSCR program may not use tax returns to calculate DTI.
At the financed-property limit. Past the agency cap, alternatives include DSCR, bank portfolio and commercial loans; compare them on total cost.
Buying in an LLC. Some DSCR and portfolio programs may permit eligible entities; ask whether a personal guaranty and specific vesting documents are required. Choose the entity with legal and tax advice first (rental property LLCs covers the trade-offs).
Strong property, tight personal DTI. A property-coverage program can remove personal DTI as the main ratio, but not credit, liquidity, identity or guarantor review.

What lenders check

Requirements vary by lender, program, state, borrower, and property, and each lender sets its own in a written matrix or term sheet. Expect it to cover:

Minimum DSCR and the formula behind it.
Down payment. Purchase programs require borrower equity. The matrix's maximum LTV can drop for a lower DSCR, lower credit, a cash-out or the property type.
Credit and reserves. Score, credit history and the cash reserves the matrix requires.
Documents. Identity and entity documents, credit authorization, asset statements, the appraisal and rent support, insurance and title. Many programs don't use tax returns or W-2s to calculate DTI, but a lender can still ask for them.
Property and use. Unit count, condo or rural status and short-term-rental use can change the matrix or rule the property out.

A DSCR above the program minimum satisfies one condition; it does not guarantee approval.

What DSCR loans cost

Pricing is quote-specific and can move daily. DSCR loans can be priced differently from comparable conventional investment-property loans, and a rate-only comparison is incomplete. Compare same-day written quotes for the same loan amount, with points, lender fees, reserves, amortization, recourse and any prepayment penalty included. Stronger coverage, better credit and lower leverage can improve pricing under a particular matrix.

Feature	DSCR loan	Conventional investment loan
Qualifies on	The property's coverage ratio, as the program defines it	Your documented income and DTI (Fannie Mae: up to 50% through Desktop Underwriter)
Borrower	Some programs permit entities; ask about guaranties	Natural persons (Fannie Mae)
Portfolio limit	No agency cap; lender exposure limits can apply	Up to 10 financed properties (Fannie Mae, Desktop Underwriter)
Credit score	Matrix-specific	No minimum through Desktop Underwriter; 620 fixed-rate or 640 ARM if manually underwritten (Fannie Mae)
Maximum LTV	Matrix-specific	85% for a one-unit purchase, 75% for 2–4 units (Freddie Mac)
Rate and fees	Quote-specific	Quote-specific

The conventional column cites Fannie Mae's Selling Guide and Freddie Mac's LTV table, linked above. DSCR matrices are each lender's own.

Using a DSCR loan to refinance out of short-term money? See hard money vs a DSCR loan and refinancing a rental property for the post-refi DSCR math.

Stress-test your DSCR before you apply

One ratio is one set of assumptions. On the sample rental, TrueCap's calculator gives:

Base case: 1.52
Rent 10% lower ($2,745): 1.34
Rate 1 point higher (7.6%): 1.38
Both: 1.21, under 1.25

The rent can fall to about $2,600 a month, 15% under the $3,050 assumed, before DSCR drops below 1.25, and to about $2,190 before NOI stops covering the payment. If every scenario clears the lender's written minimum with room left, you have a cushion. If only the base case does, a lower appraised rent or a higher rate at lock can push the ratio under the minimum.

Check the tax line too. In some states (California under Proposition 13, for example), a sale resets the assessed value to the purchase price, so underwrite the tax bill at your price, not the seller's. Property tax reassessment covers how to estimate it.

In the free TrueCap analyzer, change the rent or the rate and run it again; the DSCR sits next to cash flow, cap rate and cash-on-cash. TrueCap Pro's sensitivity grid runs the rent, vacancy and rate combinations at once.

FAQ

What's the DSCR formula?

DSCR = annual NOI ÷ annual debt service. NOI is gross rent minus vacancy and operating expenses (taxes, insurance, maintenance, management), before the mortgage. Annual debt service is the monthly principal-and-interest payment × 12; some DSCR programs use PITIA (principal, interest, taxes, insurance and association dues) instead. A DSCR of 1.25 means NOI is 1.25 times the debt service: $30,000 of NOI against $24,000 of annual payments.

What is a good DSCR for a rental property?

1.25 or higher is a common lender benchmark — the property's net operating income covers its annual debt payments 1.25 times over, leaving a 25% cushion. From 1.15 to 1.25 there's some cushion, but less than that benchmark; from 1.0 to 1.15 the property covers its debt with little room; below 1.0 its NOI doesn't cover its own mortgage payments. The 1.25 figure comes from multifamily lending standards; a lender on a house or a duplex sets its own minimum.

Is a DSCR of 1.0 good?

No — 1.0 is break-even, not good. At exactly 1.0, NOI equals debt service, so one vacant month, one furnace repair, or one insurance premium increase pushes the property into negative cash flow. Treat 1.0-1.15 as a yellow zone: acceptable only with a specific plan to raise rents or refinance, never as a steady state.

What DSCR do lenders require?

There is no market-wide minimum. Each lender or program sets its own minimum coverage threshold, and some programs allow lower coverage with different leverage, reserves, pricing, or property restrictions. Freddie Mac's Optigo multifamily loans and the federal risk-retention rule for multifamily loans use 1.25, and HUD's 221(d)(4) program uses 1.15, or 1.11 for its middle-income option. Ask for the current written formula, minimum, accepted rent evidence, leverage, pricing and reserve rules.

How is the lender's DSCR different from mine?

Some DSCR loan programs divide gross monthly rent by PITIA (principal, interest, taxes, insurance, association dues); ask your lender for its written formula. Your operating DSCR divides NOI (rent minus vacancy, maintenance, management and the other operating costs) by debt service. Lenders can also differ on the rent they accept, lease treatment, vacancy or management adjustments and rounding, so the lender's result can be higher or lower than yours. Compute both.

What happens if my DSCR is right at the lender's minimum?

You're at risk: appraised rent coming in 5% below your number can tip you below the minimum. Don't lock a rate or pay non-refundable fees until you've confirmed the appraised rent on the appraiser's Single-Family Comparable Rent Schedule (Form 1007), and ask how the lender rounds: 0.996 is below 1.00 even when it displays as 1.00.

Can DSCR be negative?

Yes, when NOI is negative: the property loses money before the mortgage is paid. TrueCap shows that negative ratio rather than a zero. Re-check the rent, vacancy and operating-expense inputs, treat the result as a serious coverage warning, and ask the lender how its own formula treats the property.

What is the DSCR on a cash purchase?

Undefined — with no loan there's no debt service, so the ratio has no denominator. TrueCap reports DSCR as N/A — no debt service on cash deals rather than showing a misleading number. For a cash purchase, judge the deal on cap rate and cash-on-cash return instead.

Can a DSCR be too high?

Not from a coverage standpoint: a 2.0 DSCR is very safe against the debt. But a high ratio produced by a large down payment means more of your cash sits in the property. Whether that lowers your cash-on-cash return depends on leverage: when the loan costs more each year than the property yields (negative leverage), more equity raises cash-on-cash; when it costs less, more equity lowers it.

What is a DSCR loan?

A DSCR (Debt Service Coverage Ratio) loan is generally a business-purpose, non-QM investment-property loan that uses the property's rental coverage as a primary qualifying metric instead of personal DTI. Clearing a program's DSCR threshold is only one condition: lenders can still review credit, liquidity and reserves, borrower or guarantor background, entity documents, property eligibility, appraisal, insurance, and other program requirements.

Do DSCR loans need a down payment?

Yes. Purchase programs require borrower equity, and each lender's matrix sets its own maximum LTV. The actual maximum can be lower based on DSCR, credit, property type, loan purpose, experience, or market. A quoted LTV is a program limit, not a promise that the file will close at that leverage.

What do DSCR loans cost?

There is no single DSCR rate. Quotes can change daily and vary with credit, LTV, DSCR, property type, occupancy, loan size, reserves, points, prepayment terms, and lender. DSCR pricing can differ from comparable conventional financing, and only same-day written quotes with matching fees and prepayment terms support a useful comparison.

When should I use a DSCR loan instead of a conventional loan?

A DSCR loan can be worth comparing when income-based conventional underwriting is a constraint, the borrower wants an eligible entity structure, or a lender's property-coverage approach better fits the transaction. Compare it with conventional and portfolio options using total cost, recourse, reserves, prepayment terms, documentation, and exit plan—not the note rate alone.

What documentation do DSCR loans require?

Requirements vary by lender, program, state, borrower, and property. Many DSCR programs do not use tax returns, W-2s, or pay stubs to calculate personal DTI, but a lender may still request income or business documents for compliance, exceptions, guarantor review, ability-to-repay questions, or another condition. Expect identity and entity documents, credit authorization, asset and reserve evidence, appraisal or rent support, insurance, title, and transaction documents, then confirm the lender's checklist in writing.

Can I use a DSCR loan for a short-term rental (Airbnb)?

Some programs allow short-term-rental properties, but eligibility and income methodology vary. A lender may use long-term market rent, documented operating history, or a specialized appraisal method, and it may impose different leverage, reserves, licensing, management, or market restrictions. Confirm the exact income evidence and property-use rules before relying on projected STR revenue.