Is your bank savings shrinking? What a real interest rate tells youWhether deposit interest keeps pace with prices comes down to this one idea

I used to think the same way everyone does: money in the bank is as safe as it gets, the interest might be thin, but at least you are not losing anything. Then one year I went back through my old numbers, lined up what I had saved against what that money could actually buy at the time, and realised the balance had climbed while what it could buy had shrunk. That was the first time I properly looked into the term real interest rate, and the moment it clicked, I finally understood that a deposit being steady and a deposit holding its value are two completely different things. This is not an argument for moving your money out of the bank. It is an attempt to walk through the maths clearly enough that you can check your own money and decide for yourself what happens next.

Let me be upfront about where I stand: money for emergencies and anything you need soon should stay exactly where it is, this is not an article meant to talk you into moving money on impulse. All I want to help you work out is whether interest is keeping pace with prices, what you do with that answer is entirely up to you. My own mistake was never that deposit rates are low, it was that for a long stretch I never thought to run this calculation at all, and by the time I did, a slice of the purchasing power I had built up over those years had already quietly slipped away.

First, one term to understand: the real interest rate

The rate your bank quotes you, the one printed on the deposit slip or shown in the app, is technically the nominal interest rate. It only tells you how much the number itself has grown, not whether what that money can buy has grown along with it. What actually decides whether you are getting richer is the real interest rate: strip out the effect of rising prices, and what is left is the real change in your purchasing power. This distinction matters, because every decision later in this piece about whether to act rests on the real rate, not the nominal one.

As a rough rule, the real interest rate is roughly the nominal rate minus the inflation rate. Say your deposit paid a certain rate in a given year and prices rose by a different amount over the same period, subtract one from the other and you get a rough sense of how your purchasing power moved that year, positive means it grew, negative means it shrank. The more precise version is the Fisher equation: (1 + nominal rate) ÷ (1 + inflation rate) − 1, and the two methods barely differ when rates and inflation are both fairly low.

Here is a feel for the numbers: say your deposit pays 2% a year in nominal interest, and prices over the same period rose 4% (purely an illustrative pair of numbers, your own figures depend on where and when you live, so go by the current published data for your own location). The real rate works out to roughly 2% minus 4%, or about negative 2%. Your balance genuinely went up. What it can buy, though, is less than it could a year ago.

Why deposits so often lag behind prices

I wondered about this too at first, shouldn't a bank offer a reasonable rate, so why does the sum so often come out negative. What I eventually understood is that this is not the bank shortchanging anyone, deposits were simply never designed as a tool for outrunning inflation.

Rates on current or easy-access accounts are usually low enough to ignore, and fixed-term rates run a bit higher but still often trail price rises over the same period, especially once inflation picks up, when the gap tends to widen further. What a deposit really sells you is two things: the safety of your principal and the convenience of getting it back whenever you want, not returns. A bank can only promise instant access because it is not taking big risks with your money, so the return was never going to be high either.

How true this is varies a great deal by place and period. In some places deposit rates have kept pace with prices for stretches of time, in others they have trailed for years. What matters is your own location, so go by the current official figures and the rate your bank is actually publishing, not numbers from somewhere else.

There is an easy trap hiding here too. Because a balance can only go up, never down on its own, most people naturally feel like they are getting richer, and hardly anyone thinks to set rising prices next to that balance and compare the two. The comfort of watching the number climb is real. Whether your purchasing power is climbing along with it is something you only find out by actually doing the sum, which is exactly why I would tell you not to just glance at the balance, go check the real rate specifically.

How to check whether your savings are shrinking

The method itself is plain: take your deposit rate, subtract the inflation rate where you live, and if the result is negative, that money is shrinking, if it is positive, it is at least roughly keeping up with prices, maybe even a little ahead.

You need two numbers. One is your account's current interest rate, easy to find in the banking app or on the deposit slip. The other is the recent inflation rate for where you live, available from your local statistics office or central bank. Subtract one from the other and you have a rough answer, no fancier tool required.

If doing the sum yourself feels like a hassle, this site's inflation and purchasing power calculator will lay it out for you, just enter the rate and the inflation figure.

This is not a one-off calculation. Rates get adjusted, inflation moves up and down, a positive answer last year is not guaranteed to still be positive this year. Building a habit, say checking every six months or once a year, is far more useful than doing it once and never again.

Real rate negative: what an ordinary person can do

When the number comes out negative, most people's first instinct is get the money out now, I would say hold on, there are a few layers worth separating first.

First, emergency money and anything you will need soon should stay in savings, leave it alone. That money's job was never to grow, it is there to be pulled out the moment you actually need it, and even if its buying power slips a little over time, the trade for being able to access it instantly is worth it. Moving it elsewhere for a bit more yield can leave you without cash exactly when you need it most. How much counts as enough varies by person, usually enough to cover a few months of basic living costs, and only you really know that number.

Second, only the money left over, the amount you are sure you will not need soon and can afford to lose, is worth considering for a partial move into inflation-resistant assets. How much to move and into what is not the focus of this piece, two other HoldValue guides cover that: safe-haven assets compared lines up gold, dollars, bonds and bitcoin against each other, and how much to allocate works out what a small slice actually means in practice so you do not overcommit. Worth adding here too, there is no need to act all at once, moving gradually and testing as you go is steadier than emptying years of savings in one move.

Third, and this is the point I most want to leave you with, seeing clearly that your savings are shrinking does not mean swinging to the opposite extreme. I have seen plenty of people run this calculation, get worked up, pull every last bit of savings out, and pile it all into something highly volatile on the logic that it is losing value sitting still anyway. That is really just betting your principal, and the risk involved is far bigger than slow shrinkage. I have made that impulsive mistake myself.

A few common misconceptions

• Treating a fixed-term deposit as holding its value. A fixed-term deposit protects the number, not the fact that your purchasing power might still shrink. If prices rise faster than the interest during that stretch, the amount you get back at maturity is the same or more in number, but genuinely buys less.
• Treating a high-yield product the same as a deposit. Seeing an investment product that pays noticeably more than a bank deposit and assuming it must just be a better deposit, while overlooking that the higher payout usually comes with higher risk attached. It is not a risk-free deposit, so read the product details and risk rating carefully.
• Going all-in on high-risk assets on impulse once you see a deposit is shrinking. This is the extreme mentioned in the section above. Working out that your savings are shrinking is not a reason to bet everything, that just trades slow shrinkage for the possibility of a much bigger loss.
• Mixing up purchasing power shrinking with something being wrong at the bank. A negative real rate means prices are rising faster than interest, it has nothing to do with whether the particular bank you use is sound or whether your deposit itself is safe. Keep the two worries separate instead of letting one feed the other.

FAQ

If my real interest rate is negative, should I pull all my savings out right away?

No. Emergency money and anything you will need soon should stay in savings, that is what the steadiness and easy access are for. Only money you can afford to lose and are sure you will not need soon is worth considering for inflation-resistant assets. Pulling your emergency fund out too, just to dodge the shrinkage, means gambling with money you cannot afford to risk.

Does a fixed-term deposit count as holding its value?

Not entirely. A fixed-term deposit protects the number, your principal will not shrink in nominal terms. But if prices rise faster than the interest during that period, what the matured amount can buy is actually less than before, which is what a negative real interest rate means. It protects the figure, not automatically your purchasing power.

What is the difference between a savings deposit and short-term government bonds?

Both lean toward being steady and liquid, but they are not the same thing. Deposits are usually backed by some form of deposit insurance, with the exact rules depending on where you live, and you can withdraw at any time. Short-term bonds mean lending money to a government in exchange for interest, and how you take part and how liquid it is varies by region. See Short-term bonds: why steady, and how to buy for the details.

How exactly do you work out a real interest rate?

A rough method is the nominal interest rate minus the inflation rate. A more accurate one is the Fisher equation: (1 + nominal rate) ÷ (1 + inflation rate) − 1. Plug in your own deposit rate and your local inflation rate, or just use this site's inflation and purchasing power calculator.

Sources

• International Monetary Fund (IMF): public macro data on inflation across economies, useful for comparing against deposit rates.
• World Bank: public databases on inflation and interest rates by country.

For the actual rate and inflation figures, follow what your local central bank, statistics office and bank currently publish, the numbers in this piece are for illustrating the method only.

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HoldValue is an independent education site. It explains how safe-haven assets work and where the risks are, so you can judge for yourself before acting. We never operate accounts for anyone and never collect sensitive information.

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