HYSA Interest Calculator

Calculate exactly how much interest you will earn in a high-yield savings account (HYSA) with daily compounding and optional monthly deposits. Compare APY rates and see the difference between a 0.05% big-bank account and a 4-5% online HYSA.

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What Is a High-Yield Savings Account?

A high-yield savings account (HYSA) is an FDIC-insured savings account that pays significantly more interest than a traditional big-bank savings account. Where the national average savings rate is often around 0.4-0.6% APY, online banks and credit unions commonly pay 4-5% APY on liquid, no-minimum HYSAs. Interest is typically compounded daily and paid monthly. This calculator takes your starting balance, APY, time horizon, and monthly contributions, then projects your ending balance and total interest earned — so you can quantify the cost of leaving money in a low-rate account.

How HYSA Interest Is Calculated

Most HYSAs compound interest daily using the formula A = P(1 + r/n)^(nt), where P is principal, r is the annual rate as a decimal, n is compounding periods per year (365 for daily), and t is time in years. On a $10,000 balance at 4.5% APY with daily compounding, you earn roughly $460 in the first year — compared with about $5 in a 0.05% big-bank account. Adding monthly deposits multiplies the effect because each new deposit starts earning interest immediately on a compounding base.

APY vs APR — Why the Difference Matters

HYSAs advertise APY (annual percentage yield), which already factors in compounding. APR (annual percentage rate) is the simple interest rate before compounding. A 4.4% APR with daily compounding produces about 4.5% APY. When comparing accounts, always compare APY to APY — not APY to APR — or the higher-compounding account will appear worse than it is. This calculator asks for APY and does the daily-compound math internally, so your projection reflects what you will actually see at year-end.

HYSA vs CD vs Money Market

A HYSA keeps money fully liquid with no withdrawal penalty, which makes it ideal for emergency funds and short-term savings goals. A certificate of deposit (CD) locks money in for a fixed term (3 months to 5 years) in exchange for a slightly higher rate — but early withdrawal forfeits several months of interest. Money market accounts (MMAs) are similar to HYSAs but often include check-writing and debit access. For most savers, a HYSA is the right default because the rate gap versus CDs is usually small and flexibility is worth preserving.

HYSA Interest Calculator: 2026 Rate Benchmarks

In June 2026, top FDIC-insured online HYSAs are paying roughly 4.00%–4.60% APY, tracking the current federal funds target range. The national average savings rate sits near 0.59%, which means a $25,000 balance earning the average rate produces about $148/year — versus about $1,138/year at 4.55%. The FDIC publishes the official national rate cap weekly at FDIC National Rates and Rate Caps — check it before you accept any bank's pitch on "above-average" rates. Updated 2026-06-19.

HYSA Tax Treatment and the $10 1099-INT Threshold

Every dollar of HYSA interest is taxable as ordinary income in the year it is credited — even if you never withdraw it. Banks issue a Form 1099-INT for any account that pays $10 or more in interest during the calendar year (smaller amounts are still taxable, just not reported). Per IRS Form 1099-INT guidance, the interest reports on Schedule B if your total interest exceeds $1,500, and gets added to your federal AGI taxed at your marginal bracket (currently 10–37%). State tax also applies in most states except Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, and Wyoming. Run this HYSA interest calculator to project the gross amount, then multiply by your marginal rate to estimate the net-of-tax return.

Best HYSA Rates by Bank (June 2026 Snapshot)

Run the calculator against the leading FDIC-insured online HYSA APYs as of June 2026. Rates compiled from each bank's published rate page and cross-checked against the FDIC National Rates and Rate Caps weekly file:

Always click through to the bank's own page to verify the rate before opening — APYs reprice within 2–4 weeks of any Fed-funds move and intro promos sometimes vanish without notice. The FDIC national savings average sits at 0.59%, so even the lowest entry above is 7x the national mean. Updated 2026-07-03.

HYSA Real Return: APY Minus Inflation (2026)

The APY on this HYSA interest calculator is your nominal return — the sticker rate before inflation eats purchasing power. Your real return is APY minus CPI inflation. Per the BLS Consumer Price Index (June 2026 release), headline CPI is running at 3.0% year-over-year (all items, all urban consumers, seasonally adjusted). A 4.50% HYSA therefore delivers a +1.50% real return — the first meaningfully positive real HYSA return since 2020. Compare with 2022, when top HYSAs paid 3.0% APY against 9.1% CPI — a –6.1% real loss. This is why the "stuff cash in a big-bank savings account at 0.59%" default silently drains buying power: at current 3.0% CPI it is a –2.4% real return. Run the calculator, then subtract the current 12-month CPI from your APY to see whether the account is actually protecting your purchasing power.

HYSA Interest Calculator: FDIC Insurance, Rate Ceilings, and 2026 Fed Policy

The HYSA interest calculator above is only as good as the rate you enter — and rates in 2026 are shaped directly by Federal Reserve FOMC decisions. The current federal funds target range sits at 4.25%–4.50% after two 25bp cuts in early 2026, and top online HYSAs track this range within 25–50 basis points. Every deposit up to $250,000 per depositor per FDIC-insured bank per ownership category is protected — verify your bank on FDIC BankFind before opening. Beware "HYSA-like" accounts at neobanks that are NOT direct FDIC members; they route deposits to a network of partner banks, which may not aggregate coverage the way you expect. When the Fed cuts rates again (markets price two more 25bp cuts by year-end 2026), rerun this calculator with the new APY — a 0.50% cut on a $50,000 balance costs you $250/year in interest.

Last updated 2026-07-15.