Open any banking app and you will see a number designed to make you feel responsible: your savings account balance, growing by some advertised percentage. The problem is that this number lies to you every single day, and the lie is so normalized that pointing it out feels almost rude.
The concept is called the real interest rate, and it is simply the nominal rate your bank advertises minus the rate at which prices are rising. If your savings account pays 4% and inflation runs at 3.5%, your real return is 0.5%. You are not building wealth; you are running on a treadmill set to a very slight incline. For much of the past two decades, that treadmill was actually tilted downward.
The silent tax nobody voted for
Inflation functions as a tax on cash holdings, but unlike actual taxes, it requires no legislation and generates no receipts. A household that diligently saved $50,000 in a traditional savings account paying 0.5% during the low-rate era of the 2010s watched that money lose purchasing power year after year. The account balance grew; what it could buy shrank. This is not a bug in the system. It is the system working exactly as monetary policy intends when central banks want to encourage spending over hoarding.
The psychological trick is that nominal gains feel like real gains. Seeing your balance increase from $50,000 to $50,250 activates the same reward centers as genuine profit, even when groceries now cost $51,000 worth of last year's dollars. Banks understand this perfectly well, which is why they advertise the nominal rate in large fonts and mention inflation approximately never.
When positive rates still mean negative returns
The recent era of higher interest rates has created a new confusion. Savers see 4% or 5% advertised on high-yield accounts and assume they are finally being rewarded for their prudence. In some periods, this is true—when inflation falls below the nominal rate, real returns turn positive and cash actually grows in purchasing power. But the relationship is not fixed, and it requires constant monitoring that most people reasonably do not have time to perform.
The deeper issue is that even positive real returns on savings accounts tend to be modest compared to long-term equity returns, which have historically averaged several percentage points above inflation over multi-decade periods. Cash is not meant to be a wealth-building vehicle; it is meant to be a store of value and a source of liquidity. Confusing these functions leads to portfolios that feel safe but systematically underperform.
Our take
Financial literacy campaigns love to celebrate the virtue of saving, and saving is indeed virtuous. But the celebration conveniently omits the part where the instrument most people use to save—the humble bank account—is designed to preserve capital at best and erode it at worst. The real scandal is not that banks pay low rates; it is that the entire framework of nominal versus real returns is treated as arcane knowledge rather than basic consumer information. Every savings account statement should be required to show your balance in last year's dollars. It would be a small, clarifying cruelty.
