A high-yield savings account (HYSA) pays 4.5–5.25% APY in today's rate environment — compared to 0.62% for the national average savings account and 0.08% for a typical checking account. This High-Yield Savings Calculator shows your HYSA balance over time with daily compounding, tax drag on your inte...
Top HYSAs 2025: 4.5–5.25% · Nat. avg: 0.62%
Most HYSAs compound daily
HYSA interest is taxed as ordinary income each year
US 10-yr avg inflation: ~3.0% · Recent CPI: 2.5–3.5%
FINAL BALANCE
$40,223.28
INTEREST EARNED
$3,223.28
EFF. APY
5.130%
AFTER-TAX INT.
$2,514.16
REAL BALANCE
$37,914.30
BALANCE AFTER 2 YEARS
$40,223.28
INTEREST EARNED
$3,223.28
EFF. APY
5.130%
AFTER-TAX BAL.
$39,514.16
BALANCE GROWTH · NOMINAL vs AFTER-TAX vs REAL
FINAL BALANCE COMPOSITION
MONTHLY INT. (YR 1)
$118.45
TAX DRAG
$709.12
REAL BALANCE
$37,914.30
PURCHASING PWR LOSS
$2,308.98
Live chart · updates as you type
| ACCOUNT TYPE | APY | INTEREST EARNED | FINAL BALANCE | vs YOUR HYSA |
|---|---|---|---|---|
| Top HYSA rate ← yours | 5.00% | $3,223.28 | $40,223.28 | — |
| Avg HYSA rate | 4.50% | $2,887.21 | $39,887.21 | −$336.07 |
| Nat. avg savings | 0.62% | $383.52 | $37,383.52 | −$2,839.76 |
| Checking account | 0.08% | $49.24 | $37,049.24 | −$3,174.04 |
Comparison uses daily compounding, no tax deduction applied. Rates are illustrative (2025). Actual rates vary.
| YEAR | OPENING | CONTRIB. | GROSS INT. | TAX PAID | NET INT. | CLOSING | REAL VALUE |
|---|---|---|---|---|---|---|---|
| Year 1 | $25,000.00 | $6,000.00 | $1,421.40 | $312.71 | $1,108.69 | $32,421.40 | $31,477.09 |
| Year 2 | $32,421.40 | $6,000.00 | $1,801.88 | $396.41 | $1,405.46 | $40,223.28 | $37,914.30 |
| TOTAL | $12,000.00 | $3,223.28 | $709.12 | $2,514.16 | $40,223.28 | $37,914.30 |
Enter your initial deposit — the amount you will open the HYSA with. Many HYSAs have no minimum deposit requirement.
Enter the HYSA annual rate (APR). Top HYSA rates in 2025 range from 4.5% to 5.25%. Check your specific bank's current rate — rates change frequently with Federal Reserve decisions.
Enter the time period in years. Use decimals for partial years (0.5 = 6 months).
Enter a monthly contribution if you plan to add money regularly. Many HYSA holders set up automatic monthly transfers from their checking account.
Select your income tax rate. HYSA interest is taxed as ordinary income each year — this is the tax drag calculation. If your HYSA is inside a Roth IRA, select 0%.
Enter the inflation rate to see your real (purchasing-power-adjusted) return. The calculator shows both the nominal balance and the inflation-adjusted balance — the difference is your purchasing power loss to inflation.
The rate comparison table below shows what the same deposit earns at different savings rates — making it easy to quantify the benefit of a HYSA vs a regular savings account.
Example: $25,000 initial deposit, 5.00% APR, daily compounding, 2 years, $500/month contributions, 22% tax rate, 3.0% inflation. Effective monthly rate: (1+0.05/365)^(365/12)−1 = 0.4176%/month. Final balance: $40,220 approx. Total contributed: $37,000 ($25,000 + $500×24). Total interest: ~$3,220. Tax drag at 22%: ~$708. After-tax interest: ~$2,512. Inflation-adjusted real balance at 3% CPI: ~$37,940 (purchasing power). Comparison: same deposit in a 0.62% savings account earns only ~$400 in interest — HYSA earns ~$2,820 more.
| NAME | FORMULA | DESCRIPTION |
|---|---|---|
| Compound Interest | A = P × (1 + r/n)^(nt) | P = principal, r = APR, n = compounding freq., t = years |
| Effective Monthly | i_m = (1 + r/n)^(n/12) − 1 | Effective monthly rate from any compounding frequency |
| Effective APY | APY = (1 + APR/365)^365 − 1 | True annual yield from daily compounding |
| Tax Drag | Tax Drag = Annual Interest × Marginal Tax Rate | Interest income lost to tax each year — reduces effective yield |
| After-Tax Yield | After-Tax APY = APY × (1 − Tax Rate) | Net yield after income tax on HYSA interest |
| Real Return | Real Return = [(1 + Nominal Rate) ÷ (1 + Inflation)] − 1 | Inflation-adjusted return — may be negative if inflation exceeds HYSA rate |
| Real Balance | Real Balance = Nominal Balance ÷ (1 + Inflation Rate)^Years | Final balance in today's purchasing power dollars |
Disclaimer: This calculator is for informational purposes only. HYSA rates change frequently and the rates shown in the comparison table are illustrative. FDIC insures deposits up to $250,000 per depositor per institution. This is not financial advice.
Last updated: April 29, 2026 · Formula verified by EagleCalculator team · Eagle-eyed accuracy for every calculation.