Interest-only is not a separate loan product. It is a payment structure layered on top of a program you already qualify for, most often a DSCR loan. During the interest-only period you pay interest alone, which reduces the monthly payment and improves the property's coverage ratio. Understanding what happens when that period ends is the whole discipline of using it well.
How Interest-Only Works
For a defined initial period, your monthly payment covers interest only — no principal. The loan balance stays flat during that time. When the interest-only period ends, the loan converts to fully amortising and the payment steps up, because the remaining principal must now be repaid over the shorter remaining term.
The trade in one line: A lower payment now, a higher payment later, and no equity built through amortisation in between. Whether that is a good trade depends entirely on what you do with the difference.
Why Investors Use It on DSCR Deals
On a DSCR loan, your qualifying ratio is the property's rent divided by its full monthly obligation. Because an interest-only payment is lower than a fully amortising one, the same rent produces a higher coverage ratio.
That has two practical consequences. First, a deal sitting just below a lender's coverage floor may clear it with an interest-only structure. Second, the monthly cash flow the property actually throws off is higher during the IO period, which matters if you are funding renovations, building reserves, or accumulating a down payment for the next acquisition.
This is especially relevant in high-price markets where prices have outrun rents — parts of California, Colorado's Front Range, the Seattle metro, and similar markets where standard amortising payments compress ratios below common thresholds.
What Happens When the IO Period Ends
This is the part borrowers underplan. At the end of the interest-only period the loan recasts: the full original balance amortises over the remaining term, which is shorter than it would have been. The payment increase is therefore larger than simply adding principal to your current payment.
Investors generally handle that in one of three ways, and you should know which is yours before you sign:
- Refinance before or at the recast, into a new loan — subject to rates and property performance at that time, neither of which you control.
- Sell the property within the interest-only window, treating it as a defined hold.
- Absorb the higher payment, having used the IO period to grow rents or improve the property so it comfortably covers the amortising figure.
A plan that depends on rates being lower later is not a plan. A plan that works at today's rates, with the IO period as upside, is.
When It Makes Sense
- A property in a lease-up or renovation phase where near-term cash flow is tight
- A deal whose coverage ratio needs help to clear a lender's floor
- A defined shorter hold with a clear exit — sale or planned refinance
- An investor deliberately redeploying the payment difference into acquisitions
- A high-price market where the amortising payment simply does not pencil
The Real Risks
- No amortisation. Your balance does not fall. If values stay flat, your equity does too.
- Payment shock at recast. The step up is larger than most borrowers model, because the term is shorter.
- Refinance risk. An exit that assumes you can refinance assumes rates, property income, and lending conditions cooperate. None are guaranteed.
- It masks a weak deal. If a property only works interest-only, the underlying deal may not work at all — that is worth confronting before closing, not after.
- Prepayment penalties. Common on investor programs and directly relevant if your plan is to refinance out.
Program parameters differ between lenders and change with market conditions. The figures here describe what is typical across the Non-QM market — your actual terms depend on your scenario, so submit your deal for real numbers.
