Sofia keeps about $20,000 in a checking and savings combination at the bank she has used since college. She is not careless. She negotiates her car insurance, she uses coupons, she would never leave a tip calculator unchecked. She has simply never thought of her bank as something that is charging her, because banks do not send a bill for the interest they decline to pay. As of June 2026, her savings sits near the national average of 0.38%, which on her balance comes to about $76 a year.
(Sofia is a composite. The story is illustrative. The math is real and typical.)
What the Bank Gap Index measures
Most personal finance coverage tells you what the best account pays. That is half the picture. The number that actually describes your situation is the distance between what your bank pays and what the best account pays, because that distance is what your loyalty is costing you. We track that distance and call it the Bank Gap Index.
The construction is simple. Take the best widely available deposit rate, subtract the rate the typical bank pays, and you have the gap. As of June 2026, the top of the market sits near 4.40% and the national average sits near 0.38%, so the headline gap is about 3.6 percentage points.
SwitchWize Bank Gap Index
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On a $20,000 balance, that gap is worth about $804 a year. Best available: 4.40% APY. National average: 0.38% APY.
Updated from live rate data. Gap = best widely available rate − FDIC national average.
A percentage gap is abstract, so we price it in dollars on a real balance. On Sofia's $20,000, a 3.6-point gap is worth about $720 a year. That is the number her bank never prints, the interest it keeps by paying her near the floor while the top of the market pays near the ceiling.
Why today widened the case, not the gap
The gap did not move much today. What moved is the story you could tell yourself about it closing. The Fed held its benchmark at 3.50% to 3.75% and erased the single rate cut it had projected for 2026, with the median policymaker now expecting rates flat to higher and a hike openly possible.
That matters because of where the gap comes from. It is not set by the Fed. It is set by banks deciding how little they can pay and still keep your deposit. A large bank with millions of customers who never leave has no competitive pressure, so it pays near the floor. An online bank with no branches has to win every dollar, so it pays near the ceiling. The Fed's rate is the tide; the gap is the distance between two boats that choose how high to float. When the Fed was expected to cut, you could at least imagine the top boat drifting down toward yours, shrinking the gap without you lifting a finger. Today the Fed removed that current. Top rates have eased only slightly since May, and the reason to expect them to fall to the floor is gone. The gap is closer to fixed than it was yesterday, which means Sofia's $720 a year is closer to fixed too.
Why the smartest savers miss it
The gap survives on a single misperception: that a savings account is a place to store money rather than a product that is priced. Sofia comparison-shops everything with a sticker, because the cost is visible. Her bank's cost is invisible by design. It arrives as an absence, the interest that never showed up, and people do not haggle over an absence. There is also the insurance illusion. Because her account and a top account carry the identical federal guarantee, they feel like the same product, when the only identical thing about them is the safety, not the pay. The guarantee is real. The sameness is not. One pays her $76 a year and the other pays about $800.
What to do with the gap
- Measure your bank by the gap, not by the brand, because the question that decides your interest is not whether the bank is reputable but how far below the top it is paying you.
- Convert the gap to dollars on your own balance, since a 3.6-point gap is easy to ignore and $720 a year is not.
- Treat the move as the lowest-risk decision you will make, because closing the gap means earning the top rate on the same federally insured dollar, with no market exposure added.
- Re-check the gap, not the Fed, since the distance between the floor and the ceiling is the thing that governs your money, and it moves on bank behavior, not on the benchmark.
The Fed spent today confirming that no one is coming to close the gap for Sofia. Her bank will keep paying her $76 a year on $20,000 for as long as she reads its silence as fairness. The top of the market would pay her about $800 on the same insured balance, and the only thing standing between those two numbers is the decision to treat her bank like the priced product it has always been.
Sofia is a composite character used to illustrate typical math. Her balance and bank are hypothetical; the average and top deposit rates, the Federal Reserve decision, and the resulting dollar figures are real as of June 2026. The Bank Gap Index value shown is drawn from the SwitchWize rate archive and must be confirmed before publishing. This article is educational and is not financial advice.
Related reading: the Bank Gap Index methodology and the top-paying accounts we track.
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Start Money Map →Bank Gap Index methodology and current value: SwitchWize rate archive. Public benchmark figures cited to primary sources. Rate data reviewed June 17, 2026.