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What your bank quietly costs you while the balance sits still

Your banking app shows a number that never goes down. So the money must be fine — right? Set a balance, pick the accounts you actually use, and race them against current U.S. inflation. The question this page answers: is money at your bank growing, or quietly shrinking? Every number is sourced, computed in front of you, or clearly labeled as an assumption.

Three doors for the same dollars: watch them separate

The solid lines are what your deposit becomes in each type of account, at the national rates as of June 2026. The dashed red line is the balance your money would need to reach just to stand still — the deposit compounding at the current 4.2% inflation rate (BLS, May 2026). That line is an illustrative assumption: it shows what happens if current inflation persisted, not a forecast. Green shading means an account is beating it; red means it's falling behind.

Your balance $10,000 Years parked 5 yrs Accounts (toggle to compare)

Rates as of June 2026: average national savings APY 0.38% (FDIC), top high-yield savings APY 4.15% (Bankrate). Checking is shown as ≈0% — most checking accounts pay little or no interest, so it's modeled at zero, labeled as such. At least one account stays selected.

↑ Solid lines: your balance. Dashed line: the balance that merely keeps its buying power (illustrative, assumes 4.2%/yr inflation persists). Click the stat cards below — each explains its own math.

This is the balance your banking app will show for average savings: –. Deposits compound: balance × (1 + APY)^years. Notice it never goes down — nominal balances in an insured account don't. That's real safety against one kind of loss (bank failure), and it's exactly what makes the other kind of loss invisible.

Same account, same years — but converted into today's buying power by dividing out inflation: –. The nominal balance is the number on the screen; the real balance is what it buys. This uses the current 4.2% CPI rate held constant (illustrative assumption — actual future inflation will differ). It's the same nominal-vs-real distinction that makes a yearly raise feel fine while it quietly shrinks — see The Quiet Pay Cut.

The gap between what average savings gives you and what the high-yield door (4.15% APY, Bankrate, Jun 2026) would have given the same deposit over the same years: –. Same money, same insurance category, same effort to deposit — different door. No one sends you a bill for this; it simply never arrives.

Your account preserves buying power only if its APY ≥ inflation. With inflation at 4.2% (BLS CPI-U, May 2026), that's the break-even. The average savings account pays 0.38% (FDIC, Jun 2026), so each year it loses (1.0038 ÷ 1.042) − 1 ≈ −3.7% of buying power — if current inflation persisted. Even the 4.15% high-yield account sits a hair under the bar. The lesson isn't "banks bad": it's that the break-even is a moving bar, and you can't know if you're clearing it without checking both numbers.

"My money is safe" and "my money is shrinking" — both true

FDIC insurance covers $250,000 per depositor, per insured bank, per ownership category (FDIC). That guarantee is about the nominal number: if the bank fails, you get your dollars back. It says nothing about what those dollars will buy. Worked example below: $10,000 parked for 5 years at the sourced June-2026 rates, with 4.2% inflation held constant (illustrative assumption).

Checking

modeled at ≈0% (labeled assumption)

$10,000

Real buying power: ≈ $8,141 of today's dollars

$10,000 × 1.00⁵ = $10,000 · real = $10,000 ÷ 1.042⁵

Average savings

0.38% APY · FDIC national rate, Jun 2026

$10,191

Real buying power: ≈ $8,297 of today's dollars

$10,000 × 1.0038⁵ = $10,191 · real = ÷ 1.042⁵

High-yield savings

4.15% APY · Bankrate top HYSA, Jun 2026

$12,254

Real buying power: ≈ $9,976 — roughly treads water

$10,000 × 1.0415⁵ = $12,254 · real = ÷ 1.042⁵

All three balances are FDIC-safe. None of the three is inflation-safe — at 4.2%, keeping full buying power would take $10,000 × 1.042⁵ ≈ $12,284. The high-yield account misses by about $30; the average account misses by about $2,093. Nominal safety and preserved value are two different promises, and only one of them is in the deposit agreement.

Understand the ideas behind the chart

Five concepts explain everything you just saw. Open each one.

APY vs APR: which way is compounding working?

APY (annual percentage yield) is what an account actually earns in a year with compounding included — interest earning interest on itself. APR (annual percentage rate) is the simple rate before compounding, and it's the number loans lead with. The direction matters: on savings, compounding works for you, so APY ≥ the stated rate. On debt, it works against you, so the true yearly cost of carrying a balance is higher than the APR suggests. Rule of thumb: banks advertise the flattering number in each direction — APY on deposits, APR on loans. Always compare like with like.

Why does the average savings rate stay near zero?

Because most deposits don't move. Switching banks feels like work — direct deposits, autopays, the account you've had since sixteen — so large banks can pay almost nothing and keep the money anyway. Economists call this deposit stickiness. Banks that do compete for deposits (often online, with lower branch costs) pay dramatically more for the identical product: the June-2026 spread was 0.38% national average vs 4.15% at the top (FDIC; Bankrate). That's not a scandal — it's a market pricing your inertia. The only lever you control is being the depositor who checks.

Nominal vs real: the two versions of your balance

Your nominal balance is the number on the screen. Your real balance is what that number buys — nominal divided by how much prices have risen. A bank statement only ever shows you the first one, which is why money can shrink while the app says it grew. The same split applies to paychecks, and it's the whole story of The Quiet Pay Cut: ten raises, rising nominal pay, falling real pay. Habit worth keeping: whenever you see a dollar amount across time, ask "nominal or real?" before you decide how to feel about it.

FDIC insurance: what $250,000 of coverage does — and doesn't — protect

FDIC deposit insurance covers $250,000 per depositor, per insured bank, per ownership category (FDIC). If your insured bank fails, you get your deposits back — that protection is real, automatic, and has held since 1933. But read what it insures: the dollar amount. It protects you against bank failure, not against inflation. A fully insured account earning 0.38% while prices rise 4.2% is losing buying power with a government guarantee that the shrinking number will be delivered in full. Both facts are true; neither cancels the other.

The six-withdrawal myth

You may have heard savings accounts allow only six withdrawals a month. That was Regulation D, a Federal Reserve rule — and the six-per-month limit was suspended in 2020. It hasn't applied as a federal requirement since. However, individual banks may still impose their own limits or fees, because the suspension made the cap optional rather than forbidden. So the accurate version is: no federal six-withdrawal rule exists today, but check your own bank's account terms before assuming unlimited access.

Check your understanding

$10,000 parked for 5 years, no deposits or withdrawals: (A) a big-bank savings account at 0.38% APY, or (B) a high-yield savings account at 4.15% APY. How far apart do they end up?

Continue the path

Module 3: Banking Basics See what inflation does to a paycheck All learning tools

Method, honesty notes & sources

What this models — and what it doesn't

It models a single deposit compounding annually at each account's APY, against a reference line of the same deposit compounding at 4.2% — the U.S. CPI-U 12-month change as of May 2026 — held constant for the whole period. That constancy is an illustrative assumption, clearly not a forecast: real inflation moves every month, and so do savings rates. Checking is modeled at ≈0% because most checking accounts pay little or no interest; we deliberately do not hardcode a fake checking APY. This page compares account categories at national benchmark rates — it does not recommend any specific bank or product, and it is education about how interest and inflation interact, not financial advice. No bank is villainized here; the spread between 0.38% and 4.15% is public information, and the math is the same for everyone.

Sources (every figure dated)

Average national savings account APY, 0.38%: FDIC National Rates and Rate Caps (June 2026).
Top high-yield savings APY, 4.15%: Bankrate best high-yield savings accounts survey (June 2026).
U.S. inflation, 4.2% — CPI-U, all items, 12-month change, May 2026: BLS CPI news release.
Deposit insurance — $250,000 per depositor, per insured bank, per ownership category: FDIC deposit insurance resources.
Rates move. All figures are static baselines, last checked June 2026 — this page does not auto-update. Before acting on anything here, check today's rates yourself.