DSCR Calculator

What is DSCR?

DSCR — Debt Service Coverage Ratio — is the single most important number in non-QM investor lending. It measures whether a rental property can pay its own mortgage out of its own rent. The formula is simple:

DSCR = Monthly Gross Rent / Monthly PITIA

A DSCR of 1.00 means rent exactly covers the mortgage (principal + interest + taxes + insurance + HOA). A DSCR of 1.25 means rent covers the mortgage with 25% to spare — which is the level most conventional lenders and the strongest DSCR lenders reward with best pricing. Below 0.75 means rent falls meaningfully short of debt service, and the lender pool shrinks sharply.

Unlike a conventional investment-property loan, a DSCR loan does not look at your personal income, W-2, tax returns, or debt-to-income ratio. The property qualifies itself. That's why DSCR is so useful for self-employed investors, LLC-vested investors, W-2 earners who have already hit the Fannie Mae 10-financed-property cap, foreign nationals, and anyone scaling a portfolio faster than their personal tax returns can keep up with.

A worked DSCR example

Let's take a single-family rental in Indianapolis. Purchase price $225,000, 25% down ($56,250), loan amount $168,750 at 7.25% on a 30-year fixed. That produces a P&I payment of roughly $1,151/mo. Add property tax of $2,800/yr ($233/mo), insurance of $1,200/yr ($100/mo), and no HOA. PITIA = $1,484. Market rent on the 1007 appraisal form comes back at $1,725.

DSCR = $1,725 / $1,484 = 1.16. That puts this deal in the 1.00–1.24 tier — broad lender access, 80% LTV available for strong credit, and mainstream pricing. Nothing heroic, nothing scary. It closes.

DSCR tier cheat sheet

How lenders actually use your DSCR

DSCR isn't a gate — it's a dial. It controls three things that really matter: your loan-to-value (LTV), your rate, and whether you qualify at all. Here's the short version of how it plays into each.

The DSCR ↔ LTV grid

Most national DSCR lenders publish an LTV matrix that looks like a chessboard. On one axis is FICO (620 → 760+), on the other is DSCR (no-ratio → 0.75 → 1.00 → 1.25+). The square where they intersect is your maximum LTV. For a 720 FICO borrower with a 1.15 DSCR on an SFR, you'll typically see 80% LTV purchase and 75% cash-out. Drop the DSCR to 0.90 with the same credit and you're more likely at 75% purchase / 70% cash-out.

DSCR-driven rate adjustments

On top of LTV, DSCR adjusts your rate. A typical lender rate-sheet pricing adjustment ("LLPA" or "add-on") for DSCR looks like:

• ≥ 1.25: 0 to −0.125% (a small rate discount)
• 1.00 – 1.24: baseline — no adjustment
• 0.75 – 0.99: +0.25 to +0.50%
• Sub-0.75 / No-ratio: +0.50 to +0.875%

These add up. Going from a 0.90 to a 1.25 DSCR on a $300,000 loan is roughly $85/month in interest — over $30,000 across a 30-year hold. That's why we build tools like the qualification estimator and the DSCR vs conventional comparison — small structural tweaks (bigger down, I/O, adjusting taxes) can unlock material savings.

DSCR ratio examples — 5 real properties

To ground the numbers, here are five representative deals across property types. All use realistic rent, tax, and insurance figures for the market.

1. SFR — Memphis, TN

Purchase $185,000 · 25% down · loan $138,750 · rate 7.00% · P&I $923 · tax $115/mo · insurance $95/mo · HOA $0 · rent $1,525. PITIA $1,133 · DSCR 1.35 · best pricing tier.

2. Duplex — Columbus, OH

Purchase $280,000 · 25% down · loan $210,000 · rate 7.25% · P&I $1,432 · tax $220/mo · insurance $140/mo · HOA $0 · combined rent $2,450. PITIA $1,792 · DSCR 1.37 · best pricing, full 80% LTV available at purchase.

3. Short-term rental — Gatlinburg, TN

Purchase $475,000 · 25% down · loan $356,250 · rate 7.625% (STR add-on) · P&I $2,521 · tax $395/mo · insurance $250/mo · HOA $0 · STR gross $4,800 (AirDNA 12-mo). PITIA $3,166 · DSCR 1.52 · qualifies for 75% LTV STR program; many lenders cap STR LTV below SFR.

4. Condo — Miami, FL

Purchase $340,000 · 25% down · loan $255,000 · rate 7.375% · P&I $1,762 · tax $480/mo · insurance $180/mo (condo HO6) · HOA $510/mo · rent $2,900. PITIA $2,932 · DSCR 0.99 · this is the classic "HOA kills DSCR" file — 0.99 drops you out of the best-pricing tier into the 0.75–0.99 bucket. Restructure: bigger down or I/O.

5. 5-unit small multifamily — Cleveland, OH

Purchase $395,000 · 30% down · loan $276,500 · rate 7.50% · P&I $1,934 · tax $410/mo · insurance $220/mo · HOA $0 · rent $4,250. PITIA $2,564 · DSCR 1.66 · 5+ unit property, slightly different lender pool (small-balance MF) but strong DSCR gives full access.

Common DSCR pitfalls

DSCR looks simple on paper and trips up experienced investors in practice. The five most common mistakes we see on broker intake calls:

1. Inflating projected rent. You can't beat the appraiser. The lender uses the 1007 market rent (or lesser of 1007 and lease). Plugging in your optimistic number wastes everyone's time.
2. Forgetting HOA. Condos, PUDs, and townhomes have dues that often run $200–$700/mo. HOA is PITIA. Always include it.
3. Using net rent instead of gross. DSCR is gross rent ÷ PITIA. Vacancy, repairs, management, and capex belong in your cash-on-cash model, not in the lender's DSCR math.
4. Mixing up I/O and amortizing payments. A 7.5% I/O payment on $200K is $1,250/mo; the fully amortizing 30-year P&I is $1,398. That's a DSCR difference of ~0.08 on a $2,800/mo rent — can move you across a tier boundary.
5. Ignoring flood insurance. If the property is in a mapped flood zone, a separate flood policy is required and is part of PITIA. A $1,200/yr flood premium = $100/mo = a potential DSCR swing from 1.02 to 0.97.

PITIA vs. PITI — the taxes and insurance debate

Some investors ask why taxes and insurance count in DSCR at all — after all, aren't those "operating expenses" rather than "debt service"? The answer: in the DSCR-lender world, almost every lender uses PITIA, not just P&I. The logic is that taxes and insurance are non-negotiable monthly obligations secured against the property — miss them and the lender's collateral is in jeopardy — so they're underwritten alongside debt service.

A tiny subset of lenders will run DSCR on PITI only (excluding HOA) or even P&I only for certain interest-only programs. These produce flattering ratios but don't reflect what most lenders will actually use. When in doubt, assume full PITIA — that's the conservative and realistic number.

Where DSCR lenders get "rent" from

The number you plug into the calculator isn't always the number the lender uses. Understanding how the lender arrives at their rent figure prevents the classic "my deal looked 1.15 but they used 0.98" surprise.

Appraiser Form 1007 (single-family) / 1025 (2–4 unit)

For an SFR or small multifamily, the appraiser provides a market rent addendum (1007 for SFR, 1025 for 2–4 unit). They pull 3–5 comparable active listings and closed leases, make adjustments for bedroom count, bath count, square footage, and condition, and arrive at a single market-rent number. On most purchase DSCR files, this single number is what drives the DSCR calculation — period.

Lesser-of rule on refinances

On a refinance of an already-tenanted property, most lenders use the lesser of (a) the 1007 market rent and (b) the actual in-place lease rent. If your tenant is paying below market, that's the number — even if market rent is higher. Exception: many lenders allow the 1007 number when the lease rolls within 90 days of closing, or when the unit is vacant at appraisal.

Short-term rental — 1007-STR or AirDNA

For STR deals, the lender wants 12 months of actual booking revenue (from AirDNA, StayScan, or the investor's Airbnb/VRBO revenue export) or a 1007-STR addendum with STR-specific comps. The gross revenue is typically haircut 20–30% to account for cleaning, platform fees, and seasonality — then divided by 12 to produce the monthly DSCR input.

Mid-term / furnished rentals

A growing category — 30-day-minimum furnished rentals targeting traveling nurses, corporate relocations, and insurance-displacement stays. Most DSCR lenders treat mid-term as long-term for DSCR purposes (use the standard 1007 number), but a few specialty lenders will run mid-term at 90% of its actual furnished-rate income. Ask before you submit.

Amortization quick-reference

If you need a back-of-napkin P&I number before running the full calculator, here's the payment per $100,000 borrowed on a 30-year fixed:

Multiply by your loan amount in hundred-thousands. A $237,500 loan at 7.50% = 2.375 × $699 = $1,660/mo P&I. Rough but close enough for DSCR sanity-checks.

Advanced levers — moving a tight DSCR

If your deal lands at 0.95–0.99 DSCR, you're close enough that small structural changes flip it into the 1.00–1.24 tier — worth another 0.375% in rate. The levers, in order of impact per dollar of effort:

1. Interest-only structure. Cuts the monthly payment 10–14% depending on rate. Moves a 0.97 DSCR to roughly 1.10. Only available on select DSCR programs, typically requires 25%+ down and 680+ FICO.
2. 40-year amortization. Available at some DSCR lenders — stretches P&I out another 10 years, drops the monthly ~7%. Mild DSCR boost, small rate add-on (~0.125%).
3. Rate buydown. Pay 1–2 points up front to drop rate 0.25–0.50%. Does the math make sense? Only if you plan to hold past the break-even point (typically 3–4 years). Check against our prepayment analyzer.
4. Larger down payment. Drops loan amount directly. Each 5% reduction in LTV typically moves DSCR by 0.06–0.08 — enough to clear a tier on tight files.
5. Tax protest / re-assessment. Long shot but sometimes works. If the tax assessor's value is clearly inflated, a successful protest can drop taxes 10–20%. Worth filing on commercial/MF automatically; less common on SFR.

DSCR vs. cash-on-cash — two different questions

A strong DSCR does not automatically mean a strong cash-on-cash return, and vice versa. They measure different things and matter to different parties:

• DSCR is the lender's question: "Will this property pay its own mortgage?" Gross rent ÷ PITIA. The lender cares because it determines default risk.
• Cash-on-cash is your question: "What return am I earning on my down payment?" (Annual net cash flow after all expenses) ÷ total cash invested. This determines whether the deal beats your opportunity cost.

A property can have a 1.40 DSCR and a 2% cash-on-cash return if the down payment and closing costs are huge and the net rent after vacancy/maintenance is thin. Conversely a property can have a 1.05 DSCR and a 12% cash-on-cash return if the down payment is small relative to the net operating profile. Run both numbers. The lender cares about the first; you should care more about the second.

Seasonal adjustments and vacancy reality

The DSCR calculator uses gross scheduled rent — a point-in-time number — but real rental income oscillates through the year. Here's how experienced investors sanity-check their DSCR figure against what actually hits the bank:

• Long-term rental vacancy: typical annualized vacancy runs 5–8% in stable markets, 10–15% in high-turnover college towns or transient markets. A 1.15 DSCR on paper often runs at 1.03–1.08 effective DSCR after vacancy. Lenders don't care (they only use gross rent), but your own pro forma should.
• STR seasonality: a Gulf Coast beach STR might gross $8K/mo in June and $2K/mo in January. Lender uses the annual average divided by 12. Your actual cash flow does not — it's lumpy, and you need 3 months of PITIA in reserve just to survive the off-season.
• Mid-term rentals: traveling nurse contracts are 13 weeks — one bad turn can leave the unit empty for 30–60 days. Most mid-term operators buffer with a 20% effective-vacancy assumption even when the nominal occupancy is 100%.
• Rent growth assumptions: don't bake 5% annual rent growth into year-1 DSCR math. Use current market rent for year 1, then model conservative growth for years 2–5 separately when evaluating long-term IRR.

Next steps

• Read our full guide to what a DSCR loan is and how it works — deeper than this page, covers every program variant.
• Review the full DSCR loan requirements — credit minimums, reserves, seasoning, property types.
• Run the qualification estimator to see your estimated rate, LTV, and probability of approval.
• Compare DSCR side-by-side with conventional investment financing on our DSCR vs conventional calculator.
• Or go straight to lender matching — we shop 40+ DSCR lenders and return your top 3 offers in one business hour.