Quick Answer: If you already have a fixed-rate loan that is locked and closed, the principal-and-interest payment does not rise when the news says rates are up. Escrow can still rise. If you are shopping, a higher rate means a higher P&I or a lower price you can afford.
Run these numbers
If you already have a fixed-rate loan that is locked and closed, the principal-and-interest payment does not rise when the news says rates are up. Escrow can still rise. If you are shopping, a higher rate means a higher P&I or a lower price you can afford.
The size of a 1% move
On a $320,000 loan (a $400,000 house with 20% down), 6.5% 30-year P&I ≈ $2,023. At 7.5%, P&I ≈ $2,237. About $214 a month. Over 30 years that is tens of thousands of extra interest if you never refinance.
Buying power falls too. If you must keep P&I at $2,023, the loan you can carry shrinks when rates rise. That is why affordability calculators ask for the rate.
ARMs and floating periods
An adjustable-rate mortgage can reset after the fixed period. Caps limit each adjustment, but the payment can still jump. If you are not planning to move before the reset, model the worst cap, not the teaser.
Worked example
Keep price $400,000 and 20% down in the calculator. Toggle 6.0%, 6.5%, and 7.5%. Only P&I should move if tax and insurance rates are unchanged. Read more on the 30-year calculator. Educational only — not a lock.
Mortgage Calculator editorial team
Organization byline. Pages are editorially reviewed; we do not invent CFA/CFP credentials or user-count testimonials. Formulas are documented on the methodology page.
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