Scenario
What happens if mortgage rates fall to 5%?
Same $750K condo, same 20% down payment — just a lower rate. Here's exactly what a drop from 6.25% to 5% does to the monthly payment and the long-term rent-vs-buy math.
Educational scenario, not a rate forecast. Mortgage rates move for reasons well beyond anyone's control — this shows the effect of a rate change, not a prediction that it will happen.
The immediate effect
$474 less per month — but the same cash to close
A lower rate only changes the mortgage payment. It has no effect on the down payment or closing costs, which are set by price and down payment percentage, not rate.
| Metric | 6.25% (current) | 5% (scenario) | Change |
|---|---|---|---|
| True monthly cost | $5,701 | $5,227 | -$474/mo |
| Cash to close | $168,750 | $168,750 | No change — rate doesn't affect down payment or closing costs |
The long-term effect
At 5%, the gap stops widening instead of tripling by year 20
A lower rate makes buying meaningfully more competitive at every checkpoint. At 6.25%, under these assumptions (4%/yr appreciation, 6%/yr investment return, 6% selling cost), the rent-vs-buy gap keeps growing — from about $112,000 at year 5 to $326,000 by year 20. At 5%, it barely moves after year 10.
| Year | Gap at 6.25% | Gap at 5% |
|---|---|---|
| Year 5 | -$112,219 | -$69,225 |
| Year 10 | -$170,231 | -$73,491 |
| Year 15 | -$240,428 | -$76,718 |
| Year 20 | -$326,357 | -$79,508 |
Negative numbers mean renting and investing is ahead by that amount. At 6.25%, that lead keeps growing every year, mostly because the owner's monthly gap versus rent keeps widening. At 5%, the gap between owning and renting is small enough that renting and investing's lead levels off instead of compounding further.
Why a rate drop changes the trajectory, not the winner
A rate drop lowers the cost of owning, not the cost of the alternative
Renting and investing keeps compounding at the same assumed return regardless of what mortgage rates do. A lower rate helps buying by shrinking the monthly gap the renter would otherwise invest — at this price point, that's enough to stop the gap from widening further, but not enough to close it.
What would close the gap further
Combine a lower rate with a higher home-appreciation assumption or a lower investment-return assumption — see the down-payment opportunity-cost article for how much the return assumption alone matters.
Rates aren't the only lever
A longer expected stay, a larger down payment, or a lower purchase price all move this calculation too — test combinations directly on the calculator.
Next step
Try the rate scenario yourself
Click "Mortgage → 5%" on the calculator to reproduce this instantly, then combine it with your own price, rent, and down payment.