DSCR Calculator: Debt Service Coverage Ratio for Investment Properties

DSCR (Debt Service Coverage Ratio) is the key metric lenders use to evaluate whether a rental property generates enough income to cover its own debt payments. Unlike conventional mortgages that look at your personal income, DSCR loans are qualified on the property's cash flow — which is why they're popular with real estate investors who have complex tax returns or multiple properties.

Use the CalcHub DSCR Calculator to see your ratio and whether it meets typical lender requirements.

The Formula

DSCR = Net Operating Income (NOI) ÷ Annual Debt Service NOI = Gross Rental Income − Vacancy − Operating Expenses (taxes, insurance, management, maintenance) Annual Debt Service = Total annual mortgage payments (principal + interest)

What DSCR Ratios Mean

DSCR	Meaning	Lender View
Below 1.0	Property doesn't cover its own debt	Most lenders won't touch it
1.0	Breaks exactly even	Some lenders accept, high risk
1.1–1.15	10–15% cushion	Some DSCR lenders accept (higher rate)
1.2–1.25	20–25% cushion	Standard minimum for most lenders
1.3–1.5	Strong cash flow	Best rates and terms
Above 1.5	Excellent cushion	May qualify for max leverage

Most DSCR lenders require a minimum of 1.20–1.25. Some go as low as 1.0 (break-even) for very strong borrowers, but at worse rates.

Worked Example

You're financing a triplex with a loan amount of $450,000 at 7.5%, 30 years.

• Monthly P&I payment: $3,147 → Annual debt service: $37,764

Income side:

• 3 units × $1,400/month × 12 = $50,400 gross potential rent
• Vacancy (5%): −$2,520
• Property taxes: −$5,200
• Insurance: −$1,800
• Management (8%): −$4,032
• Maintenance reserve: −$2,400
• NOI: $34,448

DSCR = $34,448 ÷ $37,764 = 0.91

This doesn't qualify at most lenders. Options: negotiate a lower purchase price, put more down to reduce debt service, or raise rents if the market supports it.

At 30% down instead of 25%, the loan drops to $420,000, debt service to $35,247, and DSCR improves to $34,448 ÷ $35,247 = 0.98 — still not enough.

The problem here is the property cash flow, not just the leverage. You'd need rents of roughly $1,550–$1,600/unit to hit 1.2 DSCR.

DSCR vs. DTI (Conventional Loans)

Factor	DSCR Loan	Conventional Loan
Income qualification	Property NOI	Personal W-2/tax returns
Personal income required	No	Yes
Rate	1–2% higher typically	Lower
Best for	Investors, self-employed	Owner-occupants, W-2 earners
Down payment minimum	20–25%	3–20%
Properties financed	Unlimited typically	Fannie/Freddie limits at 10

DSCR loans became popular after the pandemic as rental demand surged and investors sought simpler qualification. The trade-off is a higher rate.

How to Improve DSCR

1. Increase rents — biggest lever; even $100/month more per unit adds $1,200/year to NOI
2. Reduce vacancy — better tenant retention directly improves NOI
3. Reduce expenses — self-manage, shop insurance, reduce deferred maintenance
4. Lower debt service — larger down payment, buy points, or longer amortization (35 or 40 year, where available)
5. Choose the right property — some markets have structurally better rent-to-price ratios for DSCR qualification

Do lenders use actual rents or market rents for DSCR?

Both methods exist. Some lenders use the actual lease rent; others use a market rent analysis (often from an appraiser's rent schedule). If your property is below market rent, some lenders will use market rent — which could help you qualify even if current tenants are paying less.

Can DSCR loans work for short-term rentals (Airbnb)?

Some DSCR lenders accept short-term rental income, but they typically require 12–24 months of STR income history and may apply a more aggressive vacancy factor. Qualification is harder than for long-term rentals.

What if one unit is owner-occupied?

DSCR loans are for non-owner-occupied investment properties. If you're living in one unit of a duplex, you'd typically use a conventional owner-occupied loan, which counts both the rental income and your personal income.

Related Tools

• Cap Rate Calculator — NOI-based return metric
• Cash-on-Cash Calculator — your actual cash return after debt service
• Vacancy Rate Calculator — model realistic vacancy before DSCR calc