Savings Calculator

The growth of your savings isn't just about how much you initially deposit. Regularly adding even small amounts can dramatically increase your savings over time. Each contribution accelerates the compounding process, helping your balance grow faster. As the table above illustrates, consistently making deposits is usually even more impactful than starting with a larger sum.

Research from the Consumer Financial Protection Bureau (CFPB) confirms this: fixed recurring transfers, such as an automatic weekly or biweekly deposit, produce 1.5 to 3.5 times more savings over a year compared to popular round-up strategies. Setting up an automatic transfer on payday is one of the most effective savings habits you can build.

The mechanism is well-documented in behavioral economics. Richard Thaler and Shlomo Benartzi's landmark Save More Tomorrow program, which defaults employees into automatically increasing their savings rate with each pay raise, lifted participant savings rates from 3.5% to 13.6% in under four years, and 80% of participants stayed enrolled. More than half of large U.S. employers now use the same default-based approach. The lesson is consistent across the literature: defaults beat literacy. Knowing the math doesn't make people save; making the right action automatic does. The recurring contribution field in this calculator is a small version of that nudge. Pick a number you can ignore and let compounding do the rest.

Savings rates move with the Federal Reserve's benchmark interest rate, but banks don't pass through changes equally. After roughly 100 basis points of Fed cuts in late 2024, the five biggest online HYSAs (Ally, American Express, Discover, Marcus, Synchrony) lowered their savings rates by an average of just 83 basis points, not the full 100. Pass-through is incomplete, and the speed at which it arrives varies bank by bank. Even during easing cycles, top HYSAs tend to keep paying meaningfully more than the FDIC national average.

This also means calculator projections are estimates based on today's rates. Your actual returns will drift as rates shift, but the relative advantage of a high-yield account over a 0.01% legacy account is far more durable than the absolute APY itself.

Not every advertised APY is what you'll actually earn. Promotional rates fall into three buckets, and each one distorts the comparison in a different way:

1. Time-limited promos. A flashy 5.25% APY that drops to 3.50% after 6 months. The headline overstates your long-term earnings, and Regulation DD requires the bank to disclose a blended composite APY, but most ads bury it in the fine print.
2. Conditional / qualifying rates. The top APY only kicks in if you keep direct deposit active, run 10–15 debit card transactions a month, enroll in e-statements, or log in regularly. Miss a month and you drop to a much lower base rate.
3. Balance-capped tiers. The headline applies only up to a certain balance. Varo Bank, for example, offers 5.00% APY on the first $5,000 (with qualifying transactions) but only 2.50% on amounts above. A customer with $25,000 actually earns a blended ~3.00%, not 5.00%.

When you select a specific product in the calculator above, we model the tier structure, the cap, and any time-limited promo, so the projected balance reflects what you'll really earn, not the headline number.

Cash sign-up bonuses are a separate game. Major banks now offer $200–$3,000 to open a new account. These can be a great deal, but they aren't the same as a higher ongoing APY: a $600 bonus on a required $25,000 balance is worth roughly 0.60% in extra yield over one year. If a different bank pays even 0.40% more APY than the bonus bank, the higher rate beats the bonus inside about 18 months, and keeps winning every year after.

Many savings accounts have requirements, such as maintaining a minimum balance or paying maintenance fees. Falling below a required minimum can reduce your interest earnings or result in extra fees, ultimately lowering your savings growth.

Some accounts also use tiered rate structures, where the APY varies depending on your balance. A bank might advertise a headline rate of 5.00% APY, but that rate may only apply to balances below $5,000, with a much lower rate on amounts above that threshold. Our calculator accounts for tiered rates when you select a specific product, so the projected growth reflects the tiers that actually apply to your balance.

Savings accounts shine brightest when part of a long-term financial plan. Even modest, consistent deposits can accumulate significantly over the years, especially with frequent compounding. According to the Federal Reserve's 2024 Survey of Household Economics and Decisionmaking, 37% of Americans could not cover a $400 emergency expense with cash on hand. Building even a small savings buffer can make a meaningful difference in financial resilience.

For example, suppose you deposit $1,000 in an account with a 4% APY. Without additional contributions, you'd have about $1,040 after one year and roughly $1,217 after five years. That means interest earned accounts for around 3.85% of your total after one year, increasing to about 17.83% after five years.

Now imagine adding $250 every two weeks. Your balance could grow to around $7,667 after one year, and with continued deposits and compounding, it might reach approximately $37,164 after five years. These examples highlight how small, regular contributions can significantly boost your savings growth over time.

These calculations assume a stable 4% APY. Actual results can vary due to fees, bank policies, and fluctuations in interest rates.

After the Silicon Valley Bank and Signature Bank failures in March 2023, a Gallup poll found that 48% of Americans were worried about the safety of their money in banks, the lowest confidence reading since the 2007–2009 financial crisis. The FDIC responded by launching a national awareness campaign, because the survey surfaced a quieter problem: a large share of those worried respondents didn't know FDIC insurance existed.

Here's what to know. All savings accounts at FDIC-insured banks are protected up to $250,000 per depositor, per bank, per ownership category. Since the FDIC's creation in 1933, no depositor has ever lost a penny of insured funds. A savings account at an online bank carries the exact same federal protection as one at a major national bank, so chasing a higher rate at an unfamiliar online bank is not riskier than staying at Chase, as long as the bank is FDIC-insured and your balance is within the cap. You can verify any bank's FDIC status at FDIC BankFind, and use the FDIC's EDIE calculator to estimate your total coverage across ownership categories. Credit unions offer equivalent protection through the NCUA, insuring deposits up to $250,000 per account holder.

A high-yield savings account isn't always the right home for every dollar. The right vehicle depends on your time horizon, your state tax rate, and how the money is currently parked. Here's how the major options actually compare in early 2026.

T-bills: the state-tax math changes everything

Interest on direct U.S. Treasury obligations (including T-bills) is exempt from state and local income tax under 31 USC § 3124(a). HYSA interest is fully taxable at both levels. That gap creates a meaningful tax-equivalent yield (TEY) advantage for T-bills in any state with a real income tax. The math:

TEY = T-bill yield ÷ (1 − your state marginal rate)

Worked examples on a 4.10% T-bill (early 2026):

• California (13.3% top rate): 4.10% ÷ (1 − 0.133) = ~4.73% TEY, which beats nearly every HYSA on the market.
• New York (10.9%): ~4.60% TEY.
• New Jersey (10.75%): ~4.59% TEY.
• No-income-tax states (TX, FL, WA, NV, TN, SD, WY, AK, NH): TEY = nominal yield, so the HYSA wins on liquidity at the same rate.

T-bills also lock in their yield until maturity, while HYSA rates can drop on a day's notice. The catch: direct T-bill purchases through TreasuryDirect mean you have to pick a maturity, wait for an auction, manually reinvest, and there's no same-day liquidity. Most retail buyers go through Fidelity, Schwab, or Vanguard's brokered T-bill desks instead, which offer a more conventional buying experience and secondary-market liquidity.

I bonds: a complement, not a substitute

Series I Savings Bonds combine a fixed rate (locked at purchase for 30 years) with a variable inflation rate that resets every six months. The current composite is 4.03% APY (Nov 2025–Apr 2026), with a 0.90% fixed component. They're federal-tax-deferred and fully exempt from state and local tax. But three structural rules disqualify them as a primary cash bucket:

• $10,000 per Social Security number per year (electronic, via TreasuryDirect), plus another $5,000 in paper bonds via tax refund.
• 12-month lockup. You literally can't touch the money for the first year.
• 3-month interest forfeiture if you redeem between months 13 and 60. The penalty disappears entirely after 5 years.

Treat I bonds as a long-horizon inflation hedge inside a tax-advantaged wrapper, not as a place to keep your emergency fund.

Brokerage cash sweeps: check what your broker is paying you

If you have idle cash sitting in a brokerage account, you may be earning far less than you think. Most brokerages route uninvested cash into a default sweep, and the yields are often near zero even though comparable money market funds at the same brokerage pay market rates. The gap is structural, not transitional:

• Charles Schwab cut its default bank sweep from 0.45% to 0.05% APY over five months in late 2024, an 89% reduction. Schwab held roughly $405 billion in client sweep cash in early 2025.
• Fidelity's default (SPAXX, the Government Money Market Fund) yielded around 3.28% in March 2026.
• Vanguard's default (VMFXX) is in the same range as Fidelity.

In a January 2025 survey of 850 financial advisors, 73% recommended clients keep cash in a separate high-yield savings account rather than a brokerage default sweep. If you bank where you invest, this is worth checking before you do anything else.

A quick decision framework

The rule that follows from the math: in any state with a meaningful income tax, T-bills should be your default cash vehicle for funds you don't need this week, with an HYSA serving the immediate-liquidity layer. In no-income-tax states, the HYSA wins almost everywhere except very long horizons.