An interest-only loan is a mortgage where, for an initial period, your monthly payments cover only the interest — none of the principal. After that period ends, the loan “resets” and you begin paying principal and interest, usually over the remaining term.
How it actually works
A common structure: 10 years of interest-only payments, followed by 20 years of full principal-and-interest payments on a 30-year loan. Two things every borrower should understand:
- Your payment will jump at reset. The same balance must now be paid off in fewer years, so the new payment is significantly higher.
- You’re not building equity from payments during the interest-only period. Your balance stays the same unless the property appreciates or you pay extra voluntarily.
Who uses them — and why
- Investors who want maximum cash flow during a renovation or hold period.
- Borrowers with irregular income (commissions, bonuses, business income) who prefer lower baseline payments.
- Short-term holders who plan to sell or refinance before the reset.
The risks
- Payment shock at reset, which can strain or break a budget.
- No forced equity buildup — if the market dips, you could owe more than the home is worth with nothing paid down.
- Refinancing isn’t guaranteed. If your value, income, or the lending environment changes, your exit plan can evaporate.
Interest-only loans are specialized tools, not starter loans. They can work for disciplined borrowers with a clear plan for the reset — sale, refinance, or comfortably affording the higher payment. If you’re considering one, have a lender walk you through the exact reset payment in dollars, not just in theory, and talk through the risks with a financial advisor.