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DSCR BasicsFebruary 17, 2025

Interest-Only DSCR Loans: How They Work and When to Use Them

Interest-only DSCR loans lower your monthly payment during the IO period — which can dramatically improve your DSCR ratio and cash flow. Here's how they work.

What Is an Interest-Only DSCR Loan?

An interest-only (IO) DSCR loan is a mortgage where, for an initial period (typically 5 or 10 years), you pay only the interest on the loan — no principal reduction. After the IO period ends, the loan recasts to a fully amortizing payment over the remaining term.

The primary appeal for investors: a lower monthly payment during the IO period, which produces a higher DSCR ratio on the same property.

How Interest-Only Affects the DSCR Calculation

Here's a comparison on a $300,000 loan at 8.0% interest:

  • Fully amortizing 30-year payment:
,201/month (P+I)
  • Interest-only payment:
    • ,000/month (IO)

    If this property rents for

    ,500/month and total PITIA (with taxes + insurance) is:

    The IO structure turns a property that wouldn't qualify into one that does — and it also produces better monthly cash flow during the IO period.

    Typical IO Period Structures

    What Happens When the IO Period Ends

    When the IO period expires, your payment jumps — sometimes significantly — because you're now amortizing the full original loan balance over fewer years.

    Example: $300,000 loan, 8.0% rate, 10-year IO followed by 20-year amortization:

    Plan for this recast. If your rent hasn't grown enough by year 10 to absorb the payment jump, you may need to refinance or sell before the IO period expires.

    Who Should Use Interest-Only DSCR Loans?

    Properties Where Rents Are Expected to Rise

    If you're buying in a high-growth market (Nashville, Charlotte, Austin), rent growth over 5-10 years may make the post-IO payment fully serviceable. You benefit from lower payments today while rents catch up.

    Value-Add Properties Not Yet at Market Rent

    If you're acquiring a below-market property and plan to renovate and raise rents, IO allows you to carry the property cheaply during the improvement phase, then refinance once rents and value have increased.

    High-Leverage Investors Optimizing Cash Flow

    Investors who want to maximize monthly cash flow in the near term, and plan to sell or refinance before the IO period ends, use IO loans as a tactical choice — not a permanent financing strategy.

    Cautions With Interest-Only DSCR Loans

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    For business-purpose loans on non-owner-occupied investment properties only.

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    For business-purpose loans on non-owner-occupied investment properties only.