A central bank sets one interest rate, and almost nobody borrows or lends at it. The path from that decision to a household payment runs through several intermediate steps.
The policy rate applies to banks
The headline rate governs what banks earn on reserves held at the central bank and what they pay to borrow there.
That anchors the rate at which banks lend to each other overnight, and short-term money market rates follow it closely.
Everything a household experiences is downstream of that, priced by commercial lenders who add their own funding costs, risk assessment and margin.
Variable products move first
Loans explicitly linked to the policy rate reprice automatically, which is why some mortgage payments change within a billing cycle.
Products described as standard variable are set by the lender rather than by formula, so they move when the lender decides and by an amount it chooses.
Fixed products do not move at all until they mature, so a rate change reaches households in waves over several years as fixed terms expire and are replaced at whatever the prevailing pricing has become.
Expectations arrive before the decision
Markets price the likely path of rates continuously, and fixed-rate products are funded from those market rates rather than from the current policy rate.
Fixed mortgage pricing therefore often moves weeks before a meeting, and can be unchanged on the day of an expected decision.
A decision that matches expectations may produce no visible change, while an unexpected signal about future meetings moves pricing more than the rate itself.
Savings and borrowing rates move unevenly
Lenders pass increases to borrowers faster and more fully than to savers, and the gap between the two is the margin that funds the business.
Competition for deposits is what closes that gap, and it varies with how much funding banks need at the time.
This asymmetry is a persistent and widely documented feature of retail banking rather than a temporary lag in any particular period.
The wider effect takes far longer
Beyond individual products, rate changes work through business investment, hiring and asset prices, and those responses unfold over quarters.
Central banks act with that delay in mind, which is why decisions respond to forecasts rather than to the most recent data.
The transmission chain explains why an announced change feels remote at first and then arrives all at once when a fixed term ends, and why the household effect of a decision is still spreading long after the news coverage has moved on.