The financing guide introduces DSCR (debt service coverage ratio) loans as the option worth asking about when your existing mortgage already leaves little room in your personal debt-to-income. This tool runs the actual math lenders use to decide, plug in a property’s numbers and see where it lands, then see exactly what down payment would move it into the strongest qualification range.

How This Number Is Actually Calculated

DSCR for a residential 1-4 unit property is gross monthly rent divided by PITIA, principal, interest, taxes, insurance, and HOA dues, all combined into one monthly figure. That's a genuinely different formula than the cap rate and cash-on-cash return covered in the property analysis guide, which nets out real operating expenses like maintenance and vacancy before ever getting to a number. DSCR doesn't touch those, it only asks whether the gross rent covers the loan payment. A property can clear this calculator comfortably and still be a mediocre deal once the real numbers from the analysis guide are applied, they're answering two different questions, not the same one from two angles.

What Lenders Actually Want to See

A DSCR of 1.00 means the rent exactly covers the payment, breakeven, with nothing left over. Most lenders want at least 1.00 to consider the loan at all, and 1.25 or higher is where a lot of lenders offer their strongest pricing. Some lenders will fund below 1.00 with sufficient reserves or a larger down payment, but that's the exception, not the rule, and it typically comes with a real rate premium.

The Down Payment Lever

If a property doesn't clear the range you're hoping for, the calculator shows exactly what down payment, at the same rent and rate, would get it there. This isn't a rough estimate, it's the same amortization math run in reverse, solving for the loan amount that produces the target payment, then backing into the down payment that loan implies. If the number that comes back is uncomfortably high, that's real information about the specific deal, not a reason to force it.

Interest-Only: The Other Lever

Some DSCR lenders offer an interest-only structure specifically because it helps marginal deals qualify, removing principal from the monthly payment lowers PITIA and raises the ratio, without the loan balance actually going down. The calculator includes this as a toggle so you can see the real difference it makes on a specific deal before deciding whether it's worth asking a lender about.

What This Tool Doesn't Cover

This estimates the property-side math only. Your personal credit score, cash reserves, and the specific lender's exact minimum still matter and vary by lender, some have no minimum at all and price purely on reserves and credit. Rates used here are whatever you enter, not a live market rate, confirm current pricing with an actual DSCR lender before treating this as a final number.

Putting It Together

Run a property's real numbers here before assuming DSCR financing is or isn't an option, the math is fast and the reverse down-payment calculation often reveals more flexibility than expected. Then take the result to the property analysis guide to answer the separate, equally important question this tool doesn't ask: is it actually a good deal.

Sources:

• https://lendingone.com/insight/a-guide-to-dscr-loans-for-real-estate-investors/
• https://www.offermarket.us/blog/debt-service-coverage-ratio-loan-full-guide
• https://griffinfunding.com/non-qm-mortgages/dscr-loans/
• https://newfi.com/dscr-loan-requirements/
• https://requitygroup.com/insights/what-is-a-dscr-loan