Savings Account Calculator: How Much Interest Will You Earn in 2026?

Leaving money in a Chase or Bank of America savings account at 0.01% APY is not "safe." It's a slow guaranteed loss to inflation. High-yield savings accounts at online banks are currently paying 4.20% to 4.50% APY with the same FDIC protection. The difference in interest earned is significant.

Current Top Savings Account Rates (2026)

| Bank | APY | Min. Balance | Notes | |------|-----|-------------|-------| | Marcus by Goldman Sachs | 4.50% | $0 | No fees, online only | | Ally Bank | 4.20% | $0 | 24/7 customer service | | SoFi | 4.30% | $0 | Requires direct deposit | | Discover Online Savings | 4.15% | $0 | No fees | | Chase Savings | 0.01% | $0 | Traditional bank | | Bank of America | 0.01% | $0 | Traditional bank |

These rates change. Check current offers before moving money. But the gap between online banks and traditional banks has been persistent for years and is unlikely to disappear.

$10,000 at 4.50% vs 0.50% Over Time

This is what the compounding math looks like on $10,000 with no additional contributions:

| Year | 4.50% APY (Marcus) | 0.50% APY (Average Big Bank) | Difference | |------|--------------------|------------------------------|------------| | 1 | $10,450 | $10,050 | $400 | | 3 | $11,412 | $10,151 | $1,261 | | 5 | $12,462 | $10,253 | $2,209 | | 10 | $15,530 | $10,511 | $5,019 |

Over 10 years, the rate difference generates over $5,000 more on a $10,000 deposit. That's real money for doing nothing differently except where you park it.

Interest Earnings by Balance and Bank

Here's what you'd earn in year one at different balance levels across three different APYs:

| Balance | Marcus (4.50%) | Ally (4.20%) | Chase (0.01%) | |---------|----------------|--------------|----------------| | $5,000 | $225 | $210 | $0.50 | | $10,000 | $450 | $420 | $1.00 | | $25,000 | $1,125 | $1,050 | $2.50 | | $50,000 | $2,250 | $2,100 | $5.00 |

At $50,000, the difference between Marcus and Chase is $2,245 per year. That's a vacation, a car payment, or a contribution to your retirement account.

How Compound Interest Works in Savings Accounts

Most high-yield savings accounts compound daily and credit interest monthly. The APY (Annual Percentage Yield) already accounts for this compounding when quoted, so you can use it directly for annual calculations.

The basic formula:

Final Balance = Principal x (1 + APY)^Years

For $10,000 at 4.50% over 3 years: $10,000 x (1.045)^3 = $10,000 x 1.141 = $11,412

Simple. The compounding is already baked into the APY figure.

Monthly Contributions Make a Much Bigger Difference

The tables above show a lump sum with no new deposits. If you're adding money every month, the math changes dramatically.

$10,000 initial deposit plus $500/month at 4.50% APY:

| Year | Balance | |------|---------| | 1 | $16,520 | | 3 | $29,978 | | 5 | $45,044 |

The monthly contributions dwarf the interest at this stage. That's why your savings rate matters more than chasing the best rate by 0.1%.

Is a High-Yield Savings Account Better Than a CD?

Right now, 12-month CD rates from Marcus are around 5.10% versus their savings account at 4.50%. The CD pays more but locks your money for a fixed term with a penalty for early withdrawal.

Use a savings account when:

• You may need the money within 12 months
• You want to keep adding to the balance
• You value liquidity over the last 0.5% in yield

Use a CD when:

• You have a set amount you won't need
• Rates are falling and you want to lock in current yields

Taxes on Savings Account Interest

Savings account interest is ordinary income, taxed at your marginal rate. If you're in the 22% bracket and earn $450 in interest on $10,000, you'll owe about $99 in federal income tax. You'll receive a 1099-INT from your bank.

This doesn't make high-yield accounts less worthwhile. Even after-tax, 4.50% beats 0.01% by a factor of 300.

Run the Numbers

See exactly how your savings grow with compound interest using the Compound Interest Calculator. Model different APYs, contribution amounts, and time horizons to find the strategy that works for your situation.