Rates & Mortgages · Jul 22, 2026 · 7 min read
How Interest Rates Impact Your Buying Power
A small change in your mortgage rate can shave six figures off the price of the house you can afford. Here is the math — with examples.
The hidden tax called interest
When central banks adjust policy rates by even a quarter of a point, mortgage lenders re-price the loans they offer borrowers within hours. Yet most homebuyers shop by sticker price, not by what they can actually finance month-to-month.
A quick example
A 30-year mortgage at 4% with a $2,500 monthly budget finances roughly $523,000. Raise the rate to 7% and the same monthly payment finances only $376,000 — a 28% drop in buying power without a single dollar changing hands.
Three takeaways for global buyers
- Rate beats price. Watch your central bank, not just the listings.
- Term matters. Stretching from 25 to 30 years lowers the payment but raises the total interest meaningfully.
- Currency matters. If you earn in one currency and borrow in another, you are also taking an FX bet.
Use the calculator on this site to plug your numbers in. Even a 50bps move is worth modeling before you sign anything.