Why Introductory Savings Rates Fall Away

Savings accounts opened at a competitive rate frequently pay far less a year later. The mechanism is a bonus with an expiry date, and it operates by design.

The headline rate is often two components

Many accounts combine an underlying rate with a bonus payable for a fixed period, usually twelve months, and advertise the sum of the two.

When the bonus period ends, the underlying rate remains, and it may be a small fraction of what was advertised.

The structure is disclosed in the terms, but the expiry arrives without the balance moving or the customer doing anything.

Nothing on the account changes visibly at that point either, since the balance is unaffected and only the rate applied to it has moved.

Inertia is what makes the model work

Providers know a large share of balances will remain after the bonus ends, and the arithmetic of the product depends on that.

Acquiring a new customer costs money, and paying a temporary premium is a form of that cost, recovered afterwards from balances that stay.

The customers who move at expiry are effectively subsidised by those who do not, which is a stable arrangement as long as most people do not move.

Closed accounts drift furthest

Products withdrawn from sale still hold existing balances, and there is no competitive pressure on the rate paid to a customer base that cannot grow.

Rates on such accounts often fall further and faster than on current products, sometimes to a token level.

Because statements may arrive infrequently, the change can go unnoticed for years, particularly on accounts opened for a specific purpose and then forgotten.

Notification requirements are limited

Providers are generally required to notify material rate reductions, with the threshold and timing set by local rules that vary and change over time.

A bonus expiring on schedule may not count as a reduction at all, since it was always disclosed as temporary.

Relying on notification is therefore unreliable, which is why a diary entry at the point of opening is the practical safeguard.

Reviewing on a schedule beats reacting

Recording the bonus expiry date when the account is opened converts an unnoticed decline into a scheduled decision.

An annual review of all savings balances catches the closed-product drift as well, which no single account's diary entry would.

Moving a balance is generally straightforward, since transfers between deposit accounts are routine and no assessment or application decision is involved.

The effort is small relative to the difference, particularly on a reserve balance held deliberately for years.