Interest-Only Multifamily Loans: How IO Periods Work by Program Interest-Only Multifamily Loans: How IO Periods Work by Program

By Multi-Family USA Editorial Team · Reviewed by Josh Bauerle · Published 2026-10-08 · Updated 2026-10-08 · 12 min read

What does interest-only mean on a multifamily loan?

An interest-only (IO) loan requires only interest payments for a set period. There is no scheduled principal reduction during that period, so the monthly payment is lower than on a fully amortizing loan with the same balance and rate. After the IO period ends, the loan either begins to amortize, which raises the payment, or it matures and the balance is due.

There are two common shapes:

• Partial-term IO. The first part of the term is interest-only, and the loan amortizes afterward. A 10-year loan with 3 years of IO then amortizes over the remaining period according to the loan’s amortization schedule.
• Full-term IO. Interest only for the entire term, with the whole balance due at maturity.

The central point of this page is that IO is a cash-flow tool, not usually a leverage tool. On agency, HUD and bank loans, lenders size as if the loan were amortizing, so IO rarely increases the loan amount. It does lower your payment, which helps distributions, reserves and renovation budgets. The cost is a higher balance at maturity.

This page covers how IO works program by program. For underlying program terms, start with agency stabilized loans, Freddie Mac Optigo, Fannie Mae small loans, bank loans and bridge loans.

Interest-only rules by program

Two cautions. First, the program sheets say “available,” not “approved.” The lender and the specific tier or tests decide whether IO appears in your quote. Second, rules change. Freddie Mac’s sheets are dated 4/26 for fixed- and floating-rate loans and 11/25 for supplementals, and both say terms can change without notice.

Interest-only sizing still depends on DSCR; see commercial DSCR explained.

Why IO rarely increases proceeds

Agency

Fannie Mae’s Guide is explicit. Under Section 203.02, the lender calculates Underwritten DSCR on a level debt service payment that includes amortization, at the greater of the actual note rate or the Underwriting Interest Rate Floor, and when the loan has an IO period it must use the same level payment regardless of the length of the IO period. The IO period therefore does not help the DSCR test.

Freddie Mac says the same thing in its sheets. The footnote on its fixed- and floating-rate grids reads that the DCR calculated for partial-term and full-term interest-only periods uses an amortizing payment. Full-term IO loans additionally have lower leverage caps than amortizing loans. For a 7-year term, the maximum LTV is 80% for amortizing and partial-term IO loans and 65% for full-term IO loans.

Banks

The OCC’s Comptroller’s Handbook on Commercial Real Estate Lending says that even if a loan permits interest-only payments, the property should still meet the bank’s repayment capacity requirements as though the loan were amortizing, and that LTV and as-if-amortizing coverage requirements for IO loans are generally more conservative than those for amortizing loans. It also states that interest-only tenors are typically three to five years maximum, and that renewing or extending a loan on an interest-only basis can indicate a troubled loan unless mitigated.

The exception: debt tests on interest cost

Some lenders, particularly bridge and debt funds, size on interest coverage against the floating rate rather than on an amortizing payment. In that case an IO period does support larger proceeds, but the lender will usually apply other tests such as debt yield, a rate cap and extension requirements. That is a different underwriting model from agency or bank debt, which is why bridge loans can reach higher leverage during lease-up. See our bridge loan page.

Worked example (hypothetical numbers)

The figures below are round, invented numbers for a stabilized 40-unit building. They show the mechanics, not a quote or a market rate.

Under the agency method, the loan is limited by the amortizing payment, so the 1.25x test supports about $4.33 million no matter how much IO the loan has. A lender that sized on the IO payment alone would allow about $5.12 million, which is why some bridge-style lenders reach more proceeds than agency or bank lenders on the same NOI, and why they cost more and expect a quick takeout.

The trade-off shows up at maturity. On a 10-year loan with the same rate:

Five years of IO leaves about $360,000 more to refinance or pay at year 10 than full amortization, in exchange for roughly $45,500 less debt service in each of those five years. If rates are higher or values are lower when the loan matures, that larger balance is what you must refinance. Test it in the multifamily mortgage calculator and the loan sizing calculator, and model refinance risk using our rate risk guide.

When interest-only fits

• You have a stabilized property with a clear plan for the cash savings, such as reserves, renovations or distributions.
• Your NOI is growing, and you expect the building to be worth more at maturity.
• You will sell or refinance before or soon after the IO period ends.
• You are comfortable with a lower leverage cap on full-term IO if the program has one.
• You have modeled the balance at maturity and the refinance test, not just the payment.

When it does not fit

• If you need more proceeds on agency or bank debt. The sizing rules above mean IO rarely raises the loan amount. Improve NOI or look at other loan types.
• If coverage is thin on an amortizing basis. Lenders test as if the loan amortizes, so IO does not rescue a property that barely covers the amortizing payment.
• If you plan a long hold with no refinance plan. Full amortization builds equity automatically. IO does not.
• If you want HUD financing. HUD 223(f) loans are fully amortizing. See HUD 223(f).
• If you are buying a 1-4 unit rental. This site covers 5+ unit loans. Smaller rentals have their own DSCR loans at DSCR Authority.

IO and your other loan choices

Interest-only interacts with several other decisions. A supplemental loan can be full-term IO at Freddie Mac under the grid above. A prepayment structure is applied to the unpaid balance, and with IO the balance does not fall, so yield maintenance or a step-down premium costs more in dollars than it would on an amortizing loan with the same rate and term. Fixed versus floating is a separate decision; see the fixed-versus-floating comparison.

Step-by-step: how to evaluate interest-only

1. Ask for both quotes. Request pricing with full amortization and with each IO option, and compare the rate and the leverage cap for each.
2. Model the payment and the balance. Use the multifamily mortgage calculator for the payment and balance at the IO end date and at maturity.
3. Check coverage on an amortizing basis. Run the DSCR calculator with the amortizing payment, because that is what lenders test.
4. Check debt yield. The debt yield calculator shows NOI against the loan amount independent of payment structure.
5. Check the exit cost. Add a prepayment premium estimate with the yield maintenance calculator.
6. Get the lender view. Send the scenario to our deal review desk to compare lenders.

Questions to ask your lender

1. Is interest-only available on my asset and tier, and for how long?
2. What is the maximum LTV and minimum DSCR with IO versus without?
3. Which payment do you use to test coverage?
4. Does the IO period change the rate, fees or prepayment structure?
5. What is the amortization schedule after the IO period ends?
6. What are the maturity balance and the refinance test?

Related loan programs

Compare this with Freddie Mac Optigo and multifamily supplemental loans, where the IO rules are written in the product sheets.

Sources

• Fannie Mae, Multifamily Guide, Section 203.02: Underwritten DSCR, accessed October 8, 2026.
• Freddie Mac, Optigo Fixed-Rate Loans product sheet, 4/26, accessed October 8, 2026.
• Freddie Mac, Optigo Floating-Rate Loan product sheet, 4/26, accessed October 8, 2026.
• Freddie Mac, Optigo Supplemental Loan product sheet, 11/25, accessed October 8, 2026.
• Office of the Comptroller of the Currency, Comptroller’s Handbook: Commercial Real Estate Lending, Version 2.0, March 2022 (reputation-risk references removed March 2025), accessed October 8, 2026.

What this page does not do

Multi-Family USA is a lender-matching service operated by LendCity America. It does not originate loans, and nothing here is a commitment or a rate quote. Program terms change, and lenders add overlays, so verify every figure in a current written term sheet. This content is educational and should be combined with advice from your financing, legal, tax and accounting professionals.

Frequently asked questions