DSCR vs Debt-to-Income Ratio
The debt service coverage ratio (DSCR) divides a property's net operating income by its loan payments, so it tests whether the property can carry its own debt. The debt-to-income ratio (DTI) divides a borrower's monthly debt payments by gross monthly income, so it tests the person. Home loans are underwritten mainly on DTI; investment and commercial loans often rely on DSCR.
DSCR vs DTI side by side
| DSCR | DTI | |
|---|---|---|
| Formula | Net operating income ÷ annual debt service | Monthly debt payments ÷ gross monthly income |
| Tests | The property | The borrower |
| Better when | Higher (more income per dollar of debt) | Lower (less income committed to debt) |
| Expressed as | A multiple, e.g. 1.25× | A percentage, e.g. 36% |
| Typical loans | Investor "DSCR" loans, commercial and multifamily loans | Owner-occupied mortgages; most conventional, FHA and VA loans |
| Who sets the limit | Each lender or investor program | Loan program rules, e.g. the Fannie Mae Selling Guide, plus lender overlays |
Full definitions: DSCR, Debt-to-Income Ratio.
When each ratio is used
If you are buying a home to live in, your DTI decides how much you can borrow: the lender adds your new housing payment to your other debts and compares the total with your verified income.
If you are financing a rental through a DSCR or commercial loan, the lender cares first whether the rent supports the payment. Your personal income may matter less, but the property's documented rent and expenses matter more.
Many investors meet both: a conventional loan on a rental is underwritten on DTI, with program rules deciding how much of the expected rent can offset the new payment.
How the two limits shape a deal
A DSCR limit caps the loan to what the property's NOI can support at the lender's rate, so a higher rate or lower rent shrinks the loan and raises the cash you need. A DTI limit caps the loan to what your income can support, so a borrower with other debts can be stopped even when the property itself performs well.
Each lender sets its own minimum DSCR; 1.25× is a widely used benchmark in commercial lending, and some investor programs accept lower ratios with other conditions. Treat any single number as a rule of thumb, not a standard.
DSCR stress test
Debt service coverage ratio compares NOI with the yearly mortgage payments. Lenders often want 1.25× or more; the test shows how fast it drops when rent, vacancy, expenses or the rate move.
- DSCR
- 1.26×
- At or above 1.25×
- NOI per year
- $23,454
- Debt service per year
- $18,680
- Rent -15%1.02× · Covers the debt, below 1.25×
- Rent -10%1.10× · Covers the debt, below 1.25×
- Current rent1.26× · At or above 1.25×
- Rent +5%1.34× · At or above 1.25×
- 0%1.34× · At or above 1.25×
- 5%1.26× · At or above 1.25×
- 10%1.17× · Covers the debt, below 1.25×
- 15%1.09× · Covers the debt, below 1.25×
- Current expenses1.26× · At or above 1.25×
- Expenses +15%1.17× · Covers the debt, below 1.25×
- Expenses +30%1.08× · Covers the debt, below 1.25×
- 6.75% (current)1.26× · At or above 1.25×
- 7.75%1.14× · Covers the debt, below 1.25×
- 8.75%1.04× · Covers the debt, below 1.25×
Show the numbers as a table
| Change | Scenario | DSCR | Cash flow / month |
|---|---|---|---|
| Rent | Rent -15% | 1.02× | −$95 |
| Rent | Rent -10% | 1.10× | $22 |
| Rent | Current rent | 1.26× | $255 |
| Rent | Rent +5% | 1.34× | $372 |
| Vacancy | 0% | 1.34× | $378 |
| Vacancy | 5% | 1.26× | $255 |
| Vacancy | 10% | 1.17× | $132 |
| Vacancy | 15% | 1.09× | $9 |
| Expenses | Current expenses | 1.26× | $255 |
| Expenses | Expenses +15% | 1.17× | $121 |
| Expenses | Expenses +30% | 1.08× | −$13 |
| Interest rate | 6.75% (current) | 1.26× | $255 |
| Interest rate | 7.75% | 1.14× | $93 |
| Interest rate | 8.75% | 1.04× | −$76 |
Formula
DSCR = NOI ÷ Annual debt service (principal and interest)Assumptions
- 30-year fixed loan, no points; one unit with no other income, HOA or utilities.
- Vacancy is taken off gross rent; management, maintenance and the capital-expenditure reserve are a share of collected rent.
- Each scenario changes one input and keeps the rest; real stress usually comes in combinations.
- Lender DSCR minimums vary from about 1.00× to 1.40×.
Worked example: one deal, two tests
DSCR and DTI on the same rental purchase
Illustrative example - round numbers, not current market data. Calculated with Reaixo's calculator engines.
Assumptions
- Rental NOI
- $26,400 a year
- Rental loan
- $260,000 at 7.25%, 30 years
- Borrower gross monthly income
- $9,000
- Borrower housing payment and other debts
- $2,150 and $650 a month
| Step | Calculation | Result |
|---|---|---|
| 1. Rental principal and interest | $260,000 at 7.25% over 360 months | $1,773.66 |
| 2. Annual debt service | $1,773.66 × 12 | $21,284 |
| 3. DSCR (property test) | $26,400 ÷ $21,284 | 1.24× |
| 4. DTI before the rental | ($2,150 + $650) ÷ $9,000 × 100 | 31.1% |
| 5. DTI counting the full rental payment, no rent credit | ($2,150 + $650 + $1,773.66) ÷ $9,000 × 100 | 50.8% |
DSCR / DTI: 1.24× / 50.8%. The property covers its own loan 1.24× over, which a DSCR lender looks at. A lender underwriting the borrower's personal income sees a DTI of 50.8% if none of the rent is counted. How much rental income counts is set by the loan program, so the same deal can pass one test and strain the other.
What this calculation leaves out
- Programs differ in how much expected rent they credit toward DTI and in the DSCR they require; check the lender's guidelines.
- DSCR here uses principal and interest only; some lenders add taxes, insurance and HOA dues to the debt figure.
Common misconceptions
- A DSCR loan ignores the borrower. Lenders still check credit, reserves and experience; they just weigh the property's income more heavily.
- Rental income always offsets the new payment for DTI. How much counts depends on the program, documentation and your landlord history.
- A DSCR above 1.0 means the deal is safe. A ratio just above 1.0 leaves little room for vacancy or a rate change.
Frequently asked questions
What is the difference between DSCR and DTI?
DSCR measures the property's income against its loan payments; DTI measures the borrower's income against all their debt payments. One tests the asset, the other the person.
Do DSCR loans check debt-to-income?
Usually not in the conventional sense. They qualify the loan mainly on the property's rental income, though credit, reserves and down payment still matter.
What DTI do lenders allow?
It depends on the program. Fannie Mae's Selling Guide sets a 36% base maximum for manually underwritten loans, up to 45% with compensating factors and up to 50% through automated underwriting; lenders may be stricter.
What is a good DSCR for a rental?
Higher is safer. Many lenders look for at least 1.0× to 1.25×, but the minimum is set by each lender and program.
Calculators and guides
Recommended next step
Stress rent, vacancy and rate to see how close the property runs to a lender's minimum.
Test a rental's DSCR →Sources and review
- Selling Guide B3-6-02, Debt-to-Income Ratios, Fannie Mae. Supports: Fannie Mae maximum DTI ratios for manually and automatically underwritten loans.
- What is a debt-to-income ratio?, Consumer Financial Protection Bureau. Supports: How a debt-to-income ratio is calculated.
Where this applies: United States. Federal disclosure rules (TILA/Regulation Z, RESPA) apply nationwide; loan-program limits are set by Fannie Mae, Freddie Mac, FHA, VA or the individual lender.
Last reviewed: · Updated:
Worked examples use illustrative round numbers, not current market data. Rates, limits and program rules change - confirm current figures with your lender or a qualified professional.
General educational information, not financial, legal, tax or real estate advice. Rules vary by loan program, transaction and location - verify important decisions with qualified professionals.