Interest-only DSCR loans

An interest-only DSCR loan lets you pay only the interest for a set period, often the first 10 years of a 30-year loan (or of a 40-year loan, at lenders that offer one), and then pays the balance off over the years that are left. The lower payment raises monthly cash flow and, because many lenders qualify the loan on the interest-only payment, it raises the DSCR too. The costs: nothing comes off the balance during the period, the payment jumps when amortization starts, and lenders price the option a little higher than a fully amortizing loan.

How an interest-only DSCR loan works

For the interest-only period, each payment covers the interest and nothing else: the loan balance times the note rate, divided by 12. No principal is repaid, so the balance on the last day of the period is the amount you borrowed, unless you paid extra along the way. When the period ends, the loan amortizes: the full balance is repaid in level payments of principal and interest over the term that is left.

The common shapes on DSCR loans:

One reason interest-only and 40-year terms are ordinary on DSCR loans is regulatory. A consumer home loan that meets the CFPB's qualified mortgage standard cannot let the borrower defer principal or run longer than 30 years. A DSCR loan is business-purpose credit for a rental you do not live in, which Regulation Z exempts, so those limits do not apply, and the feature is priced instead.

How interest-only lifts the DSCR

On a fully amortizing loan the ratio is rent divided by PITIA. On an interest-only loan, many lenders use the interest-only payment plus taxes, insurance and association dues instead, sometimes called ITIA. A smaller payment in the denominator gives a bigger ratio. How to calculate DSCR covers the formula itself.

On the DSCR topic's example loan, $300,000 at 7.50% (an example rate) on a $400,000 house that rents for $3,250, with $350 of taxes and $150 of insurance a month:

That lift does two things. It can save a file that falls short: an investor on BiggerPockets describes a refinance out of a hard money loan where higher property taxes than planned pushed the ratio under the lender's minimum, and the lender offered 10 years of interest only on a 30-year term instead.

And the same rent supports a larger loan. At a 1.25 target, the largest payment is $3,250 ÷ 1.25 = $2,600, and $2,100 of it is left after taxes and insurance. Amortizing over 30 years at 7.50%, $2,100 a month carries about $300,337; interest-only, it carries $2,100 × 12 ÷ 7.50% = $336,000. The leverage cap still applies: if the program stops at 75% of the $400,000 price, the loan stops at $300,000 however much the rent supports.

Do not assume the lift, though: a lender may count a fully amortizing payment instead, and then the ratio does not improve at all. Ask which payment the lender counts before you build the deal around it.

The payment when the interest-only period ends

The period ends on a fixed date, and the new payment is set by three numbers: the balance (unchanged, unless you paid extra), the rate, and the years left. The fewer the years left, the bigger the jump. The CFPB's booklet on adjustable-rate mortgages states the rule plainly for interest-only ARMs, and it holds for any interest-only loan: the payment rises when the period ends even if rates do not move, and the longer the interest-only period, the bigger the increase. In 2006 five federal financial regulators warned borrowers that payments on interest-only and payment-option loans could double or even triple after the interest-only period or when payments adjust. On a fixed-rate DSCR loan the step is smaller, because the rate stays put, but it is still large.

The CFPB's advice on interest-only loans applies here too: do not count on selling or refinancing before the payment rises, because property values can fall and your finances can change. Plan the deal so it survives the amortizing payment, then treat an earlier exit as a bonus.

The equity you are not building

Every amortizing payment repays some principal. Interest-only payments repay none, so through the whole period your equity grows only from your down payment and any rise in the property's value.

Ten years on the example loan, with no change in the home's value:

The interest-only loan kept $26,717 more in your pocket over the ten years ($222.64 a month) and left you owing $39,615 more. The gap between those two figures, $12,898, is extra interest: the same rate charged on a balance that never shrank. Over the full life of each loan, if nobody sells or refinances, the difference grows:

Most DSCR loans end in a sale or a refinance long before their term, so the ten-year view is the realistic one, and it shows at the exit: the balance is what a sale or a refinance pays off, and a cash-out refinance has less equity to draw on.

You can close the gap yourself. The interest-only payment is usually the interest on what you owe, so principal you pay early lowers the payments after it. That flexibility is the strongest case for the option: pay the amortizing amount in good months and the interest-only amount in lean ones. Check first how the prepayment penalty treats extra principal.

How lenders price interest-only

Interest-only is a priced feature on DSCR rate sheets, and it commonly costs a little more than the same loan fully amortizing. Lenders charge for it in one of two ways:

• A price adjustment: the same rate for more points at closing.
• A rate add: a somewhat higher rate than the same file would get fully amortizing.

How much depends on the lender, your leverage and the rest of the file, so ask for both structures on the same term sheet and compare them. Around the price, some programs also tighten the eligibility rules:

• Lower leverage. Some programs cap an interest-only loan below what they lend on the same loan fully amortizing, on a purchase and on a cash-out refinance.
• A higher score floor at some programs.
• Ratio limits. Some programs limit interest-only on sub-1.00 and no-ratio files, or charge more for the combination.
• Product limits. Some programs offer it only on certain terms, loan sizes or property types.

Compare quotes at the same structure: the same interest-only period, term, prepayment penalty and points. DSCR loan rates explains the rest of the adjustment stack, and how DSCR prepayment penalties work shows how the penalty prices an early exit.

Who an interest-only DSCR loan suits

• Investors who want cash flow first. On the example house, setting aside 5% of rent for vacancy, 5% for repairs and $150 a month for big replacements leaves about $177 a month on the amortizing payment and about $400 on the interest-only one. That cushion covers a vacancy or a repair without reaching into savings.
• Short holds. If you plan to sell or refinance within the interest-only period, the principal you would have repaid is money you keep in the meantime. Match the plan to the prepayment penalty, or the penalty can cost more than the interest-only period saves.
• BRRRR and tight refinances. When a rehabbed property's refinance falls short on the amortizing payment, interest-only can carry it while rents rise, until a later refinance into an amortizing loan. The BRRRR method covers the refinance step.
• Value-add and rising rents. A property you expect to rent for more in a few years can grow into the amortizing payment before the reset.
• Markets where rents lag prices. Interest-only can lift a ratio that would otherwise need a costlier below-1.00 program.

Who it does not suit

• A long hold that only works on the lower payment. At the example's rent, the 30-year version leaves about $142 a month short after the same set-asides once the period ends ($3,250 less $2,916.78 of PITIA, less $475). If the rent has not grown by then, you are feeding the property.
• Investors who would spend the difference. The savings are only an advantage if they go into reserves, principal or the next deal.
• Flat rent markets with rising insurance. Ten years of rising costs and a payment step at the end compound each other.
• A plan that depends on a refinance. Rates, values and lending rules in ten years are unknown; a deal should not need a refinance to survive.

Questions to ask before you choose interest-only

1. Which payment do you qualify the loan on: the interest-only payment, the fully amortizing one, or the payment after the period?
2. What does interest-only cost here, in rate or in price, at my leverage?
3. What is the maximum loan-to-value with interest-only, and does it change on a cash-out?
4. How long is the interest-only period, and over how many years does the loan amortize after it?
5. Is the rate fixed through the reset, or is this an ARM whose rate can also change?
6. How does the prepayment penalty treat extra principal and a payoff inside the window?
7. What does the ratio look like at the post-reset payment? Run it yourself at both payments; GoDoor's quote calculator does the math on your own figures.

General education, not financial, tax or legal advice. Figures are examples: rates, rules and programs change, and every lender sets its own. Last checked November 4, 2026. How we research these guides.