Why a 12% return can leave you with less than a 6% one

InvestWise4U · 2026-09-01 · 4 min read

Two people each put money away for a year. One earns 12%. The other earns 6%. The one earning 12% ends up worse off.

That is not a trick question. It happens constantly, and understanding why is the single most useful thing you can do before comparing any two savings or investment products.

The number on the poster is not the number you keep

The rate a bank advertises is the nominal return. It tells you how many more rupees, dollars or dirhams you will have at the end of the year. It tells you nothing about what those units will actually buy.

Inflation is the difference. If prices rise 9% over the year while your money grows 12%, your purchasing power has grown by roughly 3%. That 3% is your real return, and it is the only figure that answers the question you actually care about: can I buy more next year than I can today?

So our two savers:

  • 12% nominal, where inflation ran at 9% — roughly 3% real
  • 6% nominal, where inflation ran at 2% — roughly 4% real

The second person got the smaller headline and the better outcome. Nothing about the first product was dishonest. The number was simply answering a different question than the one being asked.

This is why comparing a rate you saw in one country against a rate you saw in another tells you almost nothing on its own. The gap between the two is doing all the work.

Three more things that quietly shrink the number

Inflation is the largest wedge between the advertised rate and reality, but it is rarely the only one.

Fees. A 1.5% annual management fee on a fund returning 8% is not a small detail — it is nearly a fifth of your return, taken every year whether the fund does well or badly. Look for the total expense ratio rather than any single headline charge, and check whether there is an entry or exit load on top.

Lock-in. Many of the highest advertised rates require you to leave the money untouched for a fixed term. That is a real cost even if you never touch it, because it removes your ability to respond to anything — an emergency, a better opportunity, a change of plan. Ask specifically what happens if you withdraw early. On many term deposits the penalty is not a small fee; it is the loss of most of the interest you had earned, which can drop your effective return close to zero.

Tax. Interest, dividends and capital gains are frequently taxed at different rates, and sometimes the least tax-efficient option is the one with the most attractive headline. A government savings certificate paying slightly less than a corporate deposit can still leave you with more, purely because of how each is treated.

None of these are hidden exactly. They are disclosed. They are just disclosed in a different place from the number on the poster.

A worked example

Say you have a sum to place for one year and two options:

  1. A term deposit advertising 11%, with a 12-month lock-in and an early withdrawal penalty that forfeits most accrued interest
  2. A money-market fund advertising 9.2%, with a 1.1% expense ratio and same-week access to your money

The first looks clearly better by 1.8 percentage points. But after the fund's fee, the second returns about 8.1%, against 11% — so the deposit is ahead by roughly 2.9 points on paper.

Now add the part most comparisons leave out. If there is a realistic chance you need that money within the year, the deposit's 11% is not really 11%. It is 11% if nothing goes wrong and close to nothing if something does. The fund's 8.1% is 8.1% either way.

Which is better depends entirely on how likely you are to need the money — which is a fact about your life, not about the products. That is the part a comparison table cannot tell you, and the part worth thinking hardest about.

What to ask before you commit

Five questions will get you most of the way on almost any product:

  • What is the real return — the advertised rate minus current inflation?
  • What are the total annual fees, including anything charged on entry or exit?
  • What exactly happens if I need this money early, in numbers rather than in words?
  • How is the return taxed, and does that change the ranking against the alternatives?
  • Is the minimum investment within what I can commit without leaving myself short?

If a provider cannot answer these plainly, that is itself information.

Nominal returns flatter. Real returns tell the truth.

Why this site works the way it does

Every option in our comparison shows the expected yield, the real return after inflation, the fees, the lock-in period and the minimum — side by side, in the same units, for the market you actually live in. Not because those numbers are exciting, but because the headline rate on its own is the most reliable way to reach a decision you will regret.

You can see how the scoring works if you want the full method, including what we weigh and what we deliberately ignore.

This is educational information, not personalised financial advice. Inflation, tax treatment and product terms vary by country and change over time, and the figures used above are illustrative examples rather than current market rates. Always confirm the terms with the provider before committing money, and speak to a licensed professional for advice specific to your circumstances.