Saving
A rate that reverts is really two rates with a date between them
Introductory pricing on a savings account is a real return for a limited period followed by whatever the provider chooses afterwards, and the second half is where most of the money is held.
By Harsh Vardhan4 min read
The headline covers part of the term
Savings accounts are frequently advertised at a rate that applies for an opening period and then falls to something else. The advertised figure is not dishonest; it is simply the price of a limited-time offer, in the same way a shop’s opening discount is a real discount that ends. What makes it consequential for a household is that money, unlike a shopper, tends to stay put.
The structure has an obvious commercial logic. Attracting deposits is expensive, and an institution that pays a competitive rate to new money while paying less to money that has already arrived spends its budget where it changes behaviour. Every provider faces the same incentive, which is why the pattern is so widespread rather than the practice of any particular firm.
The result is that two people with identical balances at the same institution can be earning quite different amounts, and the difference is not skill. It is the date on which each of them opened the account.
The average is the number that matters
If money is going to sit somewhere for several years, the useful figure is not the opening rate but the average across the whole holding period. Consider an illustration with invented numbers. An account pays 4% for twelve months and 1% thereafter. Held for a year, it paid 4%. Held for four years without moving, it averaged 1.75%, which is a very different proposition from the one advertised.
A plain account paying a steady 2.5% throughout would have beaten it comfortably over that four-year stretch while never once appearing attractive in a comparison table. Rates are not usually these numbers and this is arithmetic rather than a description of any market, but the shape is the point.
So the question a saver is really answering is not which rate is highest today. It is whether they will actually move the money when the period ends.
The offer is priced on the assumption you will not move
Inertia is not a moral failing, it is a predictable feature of how people handle administrative tasks with no deadline. Moving an account requires remembering, choosing, opening, transferring and closing — none of it difficult, all of it easy to postpone indefinitely. And nothing prompts it, because the rate falling is not an event that announces itself in a way anyone notices.
Providers can and do model this. The economics of an introductory offer depend on a substantial share of deposits remaining after the rate falls, which means the cost of the offer is partly recovered from the customers who stay. Anyone who reliably moves is being subsidised by anyone who does not.
The response that actually works is not resolve but a reminder. A date in a calendar, set when the account is opened, converts a task with no deadline into one with a date — which is the only difference between things that get done and things that do not.
Conditions that quietly change the rate
Beyond the reversion date, several other terms can move the effective return, and they vary by product and by country. Some accounts pay the headline rate only up to a balance ceiling and much less above it. Some require a minimum monthly deposit, or reduce the rate in any month a withdrawal is made. Some pay a bonus rate that is contingent on conditions being met every month without exception.
None of these are traps in themselves. They are ways of paying more to the behaviour a provider wants, and if the behaviour suits the household anyway, the return is real. The problem arises when a condition is missed and the rate quietly drops for that period without any notification that would make it obvious.
Reading the conditions is dull and it is the whole difference between the advertised rate and the received one. The received rate is what buys things.
What this is worth relative to other levers
It is worth keeping the size of this in perspective. On a small balance, the difference between a good rate and a mediocre one is modest in absolute terms, and the effort of chasing it may be better spent elsewhere — on reducing a borrowing cost, for example, where the rates involved are usually far higher. The gap matters most where the balance is large and the horizon long.
It also interacts with what cash is for. Money held for access is not primarily trying to earn; money held for a distant purpose may not belong in cash at all. The rate question sits inside those larger ones rather than above them.
Products, rates and rules differ by country and change constantly, so nothing here describes any specific account or recommends one. What generalises is the structure — an advertised rate with a date attached is two rates, and the second one applies for longer.
Common questions
How do I know when an introductory rate ends?
The term is stated when the account is opened, and the most reliable approach is to record the date somewhere that will prompt you rather than relying on the provider to make it prominent. Some jurisdictions require notification of rate changes, but a notice is easy to miss among ordinary correspondence.
Is it worth moving savings every year to chase rates?
That depends on the size of the balance and the value of your time, since the same percentage difference is worth very little on a small sum and a good deal on a large one. Many people set a periodic review instead of chasing continuously, which captures most of the benefit for a fraction of the effort.
Why do providers pay new customers more than existing ones?
Because the payment is buying something — a new deposit — and existing money is already there. The offer is a marketing cost aimed at behaviour that changes, and its economics assume a proportion of balances will remain once the introductory period ends.
Harsh writes about spending, saving, debt, mostly the parts other people skip and prefers a plain explanation to a clever one.
