Extend IO when the existing loan is in line with current market and the lender will grant the extension for a small rate bump and amendment fee . Refinance fully when current rates are materially below the existing rate, cash-out is needed, or structural improvements justify the prepay cost.
How to evaluate each path
IO extension mechanics: the lender extends the IO period (typically by 1 to 3 years) in exchange for a small rate adjustment (typically 5 to 15 bps) and a modest amendment fee (typically 0.10% to 0.25% of outstanding balance). The amortization schedule shifts; principal payments resume after the extended IO period.
Best candidates for IO extension: agency multifamily loans with strong sponsor relationships, life-co loans where the property has performed in line with underwriting, bank perm loans with strong deposit relationships. Lenders willing to entertain extensions on properties they are happy to keep on book.
An interest-only extension can preserve near-term cash flow while leaving more principal outstanding. Compare the payment savings, amendment costs, interest, maturity balance and remaining loan terms before deciding.
When full refi is the better answer: current market rates 50 bps or more below the existing rate, cash-out is needed for partner buyout or capital deployment, structural improvements (recourse removal, MAC tightening, tighter cash-trap negotiation) justify the refi cost, or the existing loan has covenants or reporting burdens the borrower wants to escape.
Combination approach: some sponsors negotiate IO extension as a bridge to a full refi 12 to 24 months later, preserve cash flow now while waiting for a more favorable rate environment for the full refi. Coordinate timing carefully to avoid layered fees.
Sources
- Quarterly Survey of Commercial/Multifamily Mortgage Bankers Originations · Mortgage Bankers Association · 2026-Q1
- Senior Loan Officer Opinion Survey on Bank Lending Practices (SLOOS) · Board of Governors of the Federal Reserve System · 2026-Q1