A fixed-rate mortgage locks your interest rate, and therefore your principal-and-interest payment, for the term, while a variable-rate mortgage moves up or down with a benchmark rate over time. The one-sentence answer: choose fixed when you value certainty or expect rates to rise, and consider variable when you can tolerate payment swings and rates are stable or falling. Neither is universally better; the right pick depends on your budget cushion, your time in the home, and your read on where rates are heading. This is general information, not personalized advice, so verify current rates and your own numbers with a lender.
How the two compare
The trade is certainty versus potential savings. A fixed rate removes the guesswork; a variable rate hands you the upside if rates drop and the downside if they rise.
| Feature |
Fixed rate |
Variable rate |
| Rate over term |
Stays the same |
Moves with a benchmark |
| Payment predictability |
High |
Lower; can change |
| If rates rise |
You are protected |
Your payment increases |
| If rates fall |
You miss the drop unless you refinance |
Your payment can decrease |
| Best for |
Certainty, long stays, rising-rate fears |
Risk tolerance, shorter stays, stable rates |
| Main risk |
Paying more if rates fall |
Payment shock if rates climb |
A variable rate sometimes starts lower than the comparable fixed rate, which is the lure. The catch is that the saving is not guaranteed; it depends on what rates do next, which no one reliably predicts.
Who each one suits
Fixed rates suit people who want a payment they can plan a budget around for years, who plan to stay in the home a long time, or who worry rates will climb. Variable rates can suit borrowers with enough budget cushion to absorb an increase, those who expect to move or refinance soon, or those who believe rates are flat to falling. Before deciding, run the numbers on a worst-case payment, and see our guide to choosing a mortgage for the full checklist.
Which should you choose?
- Would a higher payment strain your budget? Choose fixed; the certainty is worth it.
- Planning to stay many years? Fixed protects you across the whole horizon.
- Have a real cushion and a short expected stay? Variable can pay off.
- Expect rates to fall and can stomach the risk? Variable gives you the upside.
- Cannot sleep with an uncertain payment? That answer alone points to fixed.
What to skip
- Choosing variable purely for a lower starting rate without stress-testing a higher payment.
- Assuming you can perfectly time a refinance later; you may not be able to.
- Ignoring fees and penalties that differ between products.
- Treating a rate forecast as a fact; even experts get the direction wrong.
FAQ
Is a fixed or variable mortgage cheaper?
A variable rate sometimes starts lower, but the total cost depends on future rate moves. Fixed costs more for the certainty it provides.
When does a variable mortgage make sense?
When you have budget room to absorb increases, expect to move or refinance soon, or believe rates are stable to falling.
What happens to a variable rate if rates rise?
Your payment rises with the benchmark, which can strain a tight budget. Stress-test a higher payment before choosing variable.
Should I just pick the lowest rate?
Not by itself. Weigh certainty, how long you will stay, and your ability to handle a payment increase, not only the headline number.
Where to go next
How to choose a mortgage, What is a mortgage, and How to save money for a house.