HYSA Calculator

Enter your balance and, if you like, what it earns now. This shows what the same money makes in a high-yield savings account, what staying put costs you each year, and the honest arithmetic behind the comparison: APY handled the way banks actually pay it, taxes and inflation included rather than ignored.

Data reviewed: August 2026. Figures here come from published sources and change over time. How we verify

Put this calculator on your website for free

Copy one snippet and give your visitors a working HYSA Calculator.

The gap, in one sentence

In August 2026 the best widely available high-yield savings accounts pay roughly 3.8 to 4.5% APY, the FDIC's national average for ordinary savings accounts is 0.38%, and the standard savings account at several of the biggest US banks pays 0.01%. Those are all the same product, with the same federal insurance, holding the same dollars. The only thing that differs is the number, and the number differs by a factor of several hundred.

The formula

monthly rate = (1 + APY)^(1/12) − 1
end balance = balance × (1 + r)^months + deposit × ((1 + r)^months − 1) ÷ r
interest = end balance − everything you put in

The first line is the one worth a second look. APY already includes compounding: that is its legal definition, and it is why money left alone for exactly one year earns exactly the APY. Some calculators divide the APY by 12 and compound it again, which quietly promises more than the bank will pay. On $10,000 at 4.10%, that shortcut claims $417.79 of first-year interest against the $410.00 your statement will actually show. This page computes it the way the bank does, because matching your statement is worth more than beating it by eight invented dollars.

Worked example

You have $10,000 in an ordinary savings account at the national average, 0.38% APY, and you are looking at a high-yield account paying 4.10%.

After one year: $410.00 of interest in the high-yield account against $38.00 where it is. The difference is $372.00 for changing nothing except the account.

Adding $200 a month lifts the first year's high-yield interest to $454.77. And if the money is at a typical big-bank 0.01%, the first-year gap widens to $409.00.

Left for five years at today's rates, the lump sum earns $2,225.13 in the high-yield account against $191.45 where it is: a gap of $2,033.69, with the usual caveat that a variable rate five years out is an illustration, not a promise.

Moneymaxxing, priced

There is a name going around for squeezing more out of the money you already have: moneymaxxing. Lists of its moves all open the same way, with the high-yield switch, and the arithmetic explains why. Moving an account takes most people about twenty minutes. On the $10,000 big-bank example above, those minutes are worth $409 in the first year, which is over $1,200 an hour. Almost nothing else a person can legally do with twenty minutes pays that.

The same arithmetic is less kind to the rest of the list. An hour spent stacking discount codes to save $6 paid $6 an hour. A bank sign-up bonus that takes real hours of hoop-jumping for $200 might pay $40 an hour, and it is taxable. None of that makes those moves wrong, but they are hobbies with a rebate, while the account switch is the one item on the list priced like professional work. Do the first move first.

And one ordering rule outranks the whole list: debt first. Paying down a credit card at 24% is a guaranteed, tax-free 24% return, which beats the best savings rate on this page roughly six times over. A high-yield account is where money goes after the expensive debt is gone, alongside the boring fundamentals every advisor puts ahead of optimization: an emergency fund and the retirement match, in that order.

What a low rate actually costs you

With inflation running at 3.4% year over year (CPI, July 2026), a dollar in a 4.10% account gains about 0.68% a year in real purchasing power. The same dollar at 0.38% loses about 2.92% a year in what it can buy, and at 0.01% very slightly more. A low-rate savings account does not hold money still. It moves it backwards, slowly and politely, which is easy to miss because the dollar figure on the statement never goes down.

The two honest caveats

The rate is variable. A high-yield savings rate can change any day, and it moves with the Federal Reserve. Every figure past month twelve on this page assumes today's rate holds, which history says it will not, in one direction or the other. If you want a locked rate for a known term, that is a certificate of deposit, and our CD ladder calculator prices the trade between locking money up and keeping it reachable.

Interest is taxable, including by your state. Savings interest is ordinary income on a 1099-INT. Treasury bills and I bonds are exempt from state income tax and savings interest is not, so in a high-tax state a slightly lower Treasury yield can quietly beat a slightly higher savings yield after tax. Our I bond calculator runs that comparison with the taxable-equivalent yield done properly.

The insurance question, answered plainly

A high-yield account at an FDIC member bank carries the same insurance as the account at your branch bank: $250,000 per depositor, per bank. The higher rate is not risk being priced in. An online bank has no branches to pay for, and the rate is mostly that saving handed back to depositors. The two things worth checking are that the bank is genuinely FDIC insured (or NCUA, for a credit union), and that your balance sits under the limit; past $250,000, a second bank is the standard answer.

Frequently asked questions

What is a HYSA?

A high-yield savings account: an ordinary savings account, usually at an online bank, paying a much higher rate than the standard account at a branch bank. In August 2026 the top published rates run roughly 3.8 to 4.5 percent APY, while the FDIC's national average for ordinary savings accounts is 0.38 percent and the standard savings account at several of the biggest US banks pays 0.01 percent. Same product, same insurance, very different number.

Are high-yield savings accounts safe?

At an FDIC member bank, yes, in exactly the way any savings account is: deposits are insured up to $250,000 per depositor, per bank. The higher rate is not extra risk being priced in. Online banks have no branches to pay for, and the rate is largely that saving handed back. Check the bank is FDIC insured (or NCUA for a credit union) and that you are below the insurance limit, and the safety question is answered.

What is the difference between APY and interest rate?

APY includes compounding and the plain interest rate does not, which is why the APY is always the slightly larger number of the two and the one that matches what lands in your account over a year. It is also why this calculator converts APY to a monthly rate as (1 + APY)^(1/12) - 1 rather than dividing by 12: dividing by 12 and compounding again counts the compounding twice and promises slightly more than the bank will pay.

Can my HYSA rate change?

Yes, at any time and without asking you. High-yield savings rates are variable and move with the Federal Reserve, which is the honest limit of any multi-year projection on this page: years beyond the first assume today's rate holds. If you want a rate locked for a fixed term, that is what certificates of deposit are for, and our CD ladder calculator prices the trade between locking and staying liquid.

Is HYSA interest taxable?

Yes. It is ordinary income, your bank reports it on a 1099-INT once it passes $10, and it is taxed at your marginal federal rate and, in most states, your state rate too. That last part is the quiet difference from Treasury bills and I bonds, which are exempt from state tax. In a high-tax state, a slightly lower Treasury yield can beat a slightly higher HYSA yield after tax, and our I bond calculator does that comparison properly.

Is moneymaxxing worth it?

The first move on every moneymaxxing list, moving idle cash to a high-yield account, is worth checking with real numbers: on $10,000 sitting at a typical big-bank 0.01 percent, the switch is worth about $409 in the first year for roughly twenty minutes of effort, which is over $1,200 an hour. Almost nothing else on those lists pays a fraction of that per hour. The honest ordering the trend sometimes skips: fundamentals first. Paying down a 24 percent credit card beats any savings rate on earth, six times over.

Why does my big bank pay so little?

Because it can. Branch banks hold deposits from people who chose them for the branches, the app, or habit, not the rate, and those deposits mostly stay when rates elsewhere rise. There is nothing improper about it, and nobody needs to feel foolish for having such an account; most people were never told the gap existed. But it is a real gap: 4.10 percent against 0.01 percent is 410 times the interest on the same dollars.

How much should I keep in savings versus investing?

A savings account is for money with a job in the next few years: the emergency fund, the house deposit, the tax bill. For those, the guarantee matters more than the yield. Money you will not touch for a decade has historically done far better invested, which is a different calculator and a different conversation. The mistake this page can catch is the opposite one: long-term money is at least a choice, while an emergency fund at 0.01 percent is just a donation.

Related calculators