Savings Rates Follow The Central Rate With A Lag

Savings rates move roughly with a central bank's policy rate, but not immediately and not symmetrically. The asymmetry is consistent enough to be predictable in direction.

Deposits are one funding source among several

Banks fund lending from deposits, from wholesale markets and from their own capital, and they choose the mix according to relative cost.

When wholesale funding is cheap or when a bank holds more deposits than it needs, competing hard for savings has little value, and rates stay low regardless of the policy rate.

This is why deposit rates track policy rates loosely rather than mechanically, and why the relationship changes across different phases of a cycle.

Falls pass through faster than rises

A cut in the policy rate reduces what banks earn on their own reserves and on variable lending, so passing it to depositors protects margin and is done promptly.

A rise increases those earnings, and passing it on reduces the gain, so there is no equivalent urgency, and the increase arrives gradually and often incompletely.

The pattern is well documented across markets and is a straightforward consequence of who benefits from each direction of adjustment.

Competitive pressure supplies the missing urgency

Rate rises do eventually reach depositors, driven by institutions seeking deposits and by customers moving balances toward better-paying accounts.

That process depends on customers actually moving, which is why the pass-through is faster in markets where switching is easy and slower where it is not.

Regulatory attention to the gap between policy rates and paid rates has increased in various places, and the rules and expectations vary by jurisdiction and change.

Fixed terms price expectations rather than the current rate

A fixed-rate deposit is priced from what the institution expects rates to average over the term, not from where they stand on the day it is offered.

This is why fixed rates can be lower than instant access rates when cuts are anticipated, and higher when increases are expected, which looks contradictory without the explanation.

It also means the fixed rate contains a forecast, and the saver is accepting that forecast rather than making an independent one.

The real return depends on prices, not the policy rate

What a deposit is worth in purchasing power depends on the gap between the rate paid and the change in prices over the same period.

Policy rates and price changes are related but not equal, so a period of high rates can still leave savers with a negative real return.

Which makes the comparison worth doing in real terms, though this describes how the arithmetic works rather than suggesting what any saver should do with it.