An interest-only loan lets you pay nothing toward principal for a fixed term—typically five, seven, or ten years. Your payment covers interest alone, so it starts lower than a fully amortizing loan at the same rate. That window can buy breathing room for rental cash flow, a bonus-heavy W-2, or commission income that arrives in chunks. But when the interest-only period ends, the loan recasts: you'll owe principal and interest on the remaining balance, and the payment climbs—sometimes sharply.
How the interest-only period works
Imagine a $400,000 loan at 7.25% interest-only for the first ten years. Your monthly payment is roughly $2,417—only the interest. On a thirty-year fully amortizing loan at the same rate, you'd pay about $2,728, an extra $311 each month. These figures are illustrative; rates and products are subject to change and this is not a commitment to lend. During those ten years your principal balance stays $400,000; you're not building equity through paydown, only through property appreciation.
What happens at recast
At year ten the loan recasts to fully amortize over the remaining twenty years. Now you owe principal and interest on $400,000 spread across 240 months. At the same 7.25% rate, the new payment jumps to approximately $3,142—a $725 increase. If rates have moved or the loan includes an adjustment feature, the swing can be larger. Borrowers who haven't prepared for that step often refinance before recast, sell the property, or tap other liquidity.
Cash-flow uses for investors and variable earners
Real-estate investors prize interest-only loans when rental income barely covers a standard payment but the property will appreciate or be repositioned within a few years. The lower payment preserves cash for repairs, another down payment, or reserves. Self-employed borrowers and commission salespeople use the structure to smooth lumpy income: a smaller monthly obligation leaves room to absorb lean months, then make lump principal payments during flush quarters. The loan gives you permission to pay more anytime, but it doesn't require it—flexibility that matters when revenue swings.
The discipline it demands
Interest-only is not auto-pilot. You must plan for recast or exit before it arrives. That means tracking property value, monitoring rate environments, and keeping reserves liquid. If you treat the lower payment as permanent spending money instead of a strategic tool, recast will hurt. The structure works when you deploy the saved cash flow toward wealth-building—additional properties, business reinvestment, tax-advantaged accounts—and know exactly how you'll handle year eleven. Consult a CPA or attorney; this is not tax or legal advice.
The Alliance take
Interest-only loans suit disciplined borrowers with a clear exit or income plan, not someone hoping to stretch into a home they can't afford when the recast clock runs out. If your strategy and reserves support it, the tool is powerful. If you're flying blind, it's a trap. Ready to model the math? Visit our calculators or start an application to see whether interest-only fits your scenario.