How a Rate Hike Affects Your Monthly Payment
When the Federal Reserve raises interest rates, variable-rate loans — including adjustable-rate mortgages (ARMs) and HELOCs — reset to the new benchmark, directly increasing your monthly payment. The larger your outstanding balance and the longer your remaining term, the more a 1% hike will cost you each month.
This calculator uses the standard amortization formula to compare your current and post-hike payments. For example, on a $300,000 loan with 20 years remaining, a rate increase from 6% to 7% raises the monthly payment by about $195, adding roughly $2,340 per year to your costs.
To manage rate hike risk, consider: (1) building a cash buffer to absorb higher payments, (2) making extra principal payments to reduce the balance before the rate adjusts, or (3) refinancing to a fixed-rate loan while rates are still manageable. Knowing the exact dollar impact helps you plan ahead rather than react.
Frequently Asked Questions
Yes. Enter your current outstanding balance as the loan balance, your current rate, the new rate after adjustment, and the remaining term. The result shows exactly how much your monthly payment will change.
The formula assumes the new rate applies immediately for the remaining term, which is standard for most ARM resets. The payment shown reflects what you'd owe each month at the new rate going forward.