Interest rates set the price of your biggest expense, and they move whether you're paying attention or not. You can't predict them — nobody reliably can — but you can position your portfolio so that rate moves in either direction don't dictate your outcomes.
Deals should work at today's rate
Underwrite every purchase at the rate you can actually lock today, not the rate you hope to refinance into. If a deal only pencils after a future refinance to a lower rate, the deal doesn't pencil — you're buying an option on rate cuts and paying full price for it. A deal that cash-flows at today's rate gets better if rates fall and survives if they don't.
When rates fall
Falling rates hand you two levers: refinance existing debt (run the break-even — closing costs divided by monthly savings) and reprice your buying power, since every payment supports a bigger loan. Beware the second lever: falling rates lift everyone's buying power, so purchase prices usually rise to absorb the difference. The refinance lever is the reliable one.
When rates rise
Fixed-rate debt you already hold becomes an asset — a 30-year loan at 5% in a 7.5% world is worth keeping, which argues against selling and in favor of holding or borrowing against equity elsewhere. Rising rates also soften prices and thin the buyer pool, which is when cash-flow-focused buyers with financing lined up find the best deals.
Worked example
You hold a $200,000 balance at 7.25% and rates drop to 6.0%. Monthly savings ≈ $165; closing costs ≈ $5,000; break-even ≈ 30 months on a property you'll hold ten years — refinance. Your other loan is at 4.75%: rates would need to fall below roughly 3.5% before touching it makes sense. Same portfolio, opposite answers.
When this rule of thumb breaks
Rate strategy is secondary to deal quality: a mediocre property at a great rate is still a mediocre property. Waiting for rates "to come down" has an invisible cost — missed years of rent growth, amortization, and appreciation often exceed the interest saved. And adjustable-rate debt turns this whole topic from strategy into exposure: if a reset could break your cash flow, fix the structure before optimizing anything else.