APY is the annual percentage yield on a savings account, certificate of deposit, or money market. It tells you the actual return you will earn in one year, after the effect of compounding.
This guide explains what APY means, the formula behind it, how it differs from APR, and how to use APY to compare savings accounts in 2026. For a plain-English version of the same concept, see our companion piece on APY meaning and what it tells you in practice.
APY vs Interest Rate
Banks quote two related numbers on savings accounts:
- Interest rate: the simple annual rate, ignoring compounding.
- APY: the effective rate, including compounding.
If a HYSA quotes a 4.90% interest rate compounded daily, the APY is 5.02%. The APY is always the truer number, and U.S. law (Regulation DD) requires banks to disclose APY on all deposit accounts.
The APY Formula
APY = (1 + r/n)^n - 1, where r is the simple interest rate and n is the compounding periods per year.
Most banks compound daily (n = 365). Some compound monthly (n = 12) or quarterly (n = 4). The more frequent the compounding, the higher the APY for the same simple rate. A 5.00% rate compounded monthly produces a 5.12% APY, while 5.00% compounded daily produces 5.13%. The gap looks small in percentage terms but matters on six-figure balances.
Why APY Matters
APY is the only fair way to compare savings accounts. Two accounts can have the same simple rate but different APYs because their compounding frequencies differ.
Comparing APY to APY also lets you ignore marketing tricks like quoting rates that compound monthly to make them look closer to a daily-compounding competitor.
Worked Example: $5,000 Over Two Years
Numbers help fix this in memory. With $5,000 sitting in three different accounts and no further deposits, daily compounding produces these balances after two years:
- 0.40% APY: about $5,040.
- 4.00% APY: about $5,408.
- 4.75% APY: about $5,486.
The difference between 4.00% and 4.75% APY on $5,000 is about $78 over two years. The difference between 0.40% and 4.75% is roughly $446. APY shopping pays off.
APY on Different Products
APY shows up on most deposit-style products:
- High-yield savings accounts: variable APY, can change at any time. See our explainer on what a HYSA is and how high-yield savings accounts work for the full picture.
- CDs: fixed APY for the full term.
- Money market accounts: variable APY, often tiered by balance.
- Checking accounts: rare, but a few online banks pay APY on balances above a threshold.
For a deeper comparison of where to put cash long term, our guide to high-yield savings accounts and roundup of high-interest savings accounts walk through the strongest current options.
Tracking APY Across Accounts
If you have multiple accounts at different APYs, an app like Monarch Money can pull every account into one dashboard so you can see, at a glance, which balances are working hardest for you and which are sitting at low APYs.
Monarch Money
Monarch Money
Monarch Money simplifies personal finance by uniting all your accounts in one place—secure, ad-free, and built for couples. 50% off your first year when you sign up via Firstcard!
Standout feature
#1 rated budgeting app (WSJ). 50% off first year via Firstcard.
Fees
$14.99/mo or $99.99/yr ($8.33/mo)
Pros
Beautiful, ad-free interface (4.9★ App Store). Best budgeting app for couples and families. Comprehensive account syncing and cash flow forecasting.
Cons
No free tier — requires paid subscription.
APY vs APR
APY (annual percentage yield) is for things you earn money on. APR (annual percentage rate) is for things you owe money on. Our explainer on what APR means and how it shows up on credit cards and loans covers the borrowing side in detail.
On a credit card, APR ignores compounding. The card's effective annual interest is closer to the daily-compounded equivalent. That is why paying the balance in full each month, before any interest accrues, saves so much money.
Common Mistakes With APY
- Comparing the simple rate of one bank to the APY of another: the APY of the same product is always slightly higher.
- Assuming a teaser APY (5.50% for the first 90 days) holds forever; check the ongoing rate.
- Forgetting that APY is variable on most accounts and can drop without notice.
- Leaving large balances at a 0.40% bank because the APY went unchecked for two years.
- Assuming a higher APY in marketing always wins; sometimes a lower APY at a no-fee bank yields more after costs.
Tax Implications of APY Earnings
The IRS taxes savings interest at your ordinary income rate, the same rate you pay on wages. There is no preferential rate the way long-term capital gains are taxed.
A $20,000 balance at 4.50% APY earns about $920 in a year. If your marginal tax rate is 24%, roughly $221 of that goes to federal income tax, and you keep about $699. State tax may take more depending on where you live. Banks send a 1099-INT for any year you earn $10 or more in interest.
APY and Credit Building
APY does not appear on your credit report and does not directly affect your credit score. But strong saving and credit building work together.
While your savings earn APY, a Firstcard credit builder card reports on-time payments to all three bureaus. Each month you grow APY in savings and history in credit, two parallel tracks that build financial health.
For an account that pays a strong APY on everyday checking dollars, Current Banking offers up to 4.00% APY (with a $200 qualifying direct deposit), no monthly fee, no minimum balance, paychecks up to 2 days early, and $200 of fee-free overdraft coverage.
Current Banking
Current Banking
Current is a mobile-first banking app with no monthly fee and no minimum balance. Members can earn up to 4.00% APY with a qualifying direct deposit of $200, receive direct-deposit paychecks up to 2 days early, and overdraft up to $200 fee-free.
Standout feature
4.00% APY on Savings Pods (with a $200+ qualifying direct deposit) plus paycheck up to 2 days early — both included on the standard account for free
Fees
Free
Pros
$0 monthly fee; up to 4.00% APY on Savings Pods with qualifying direct deposit; paycheck up to 2 days early;
Cons
No physical branches
Frequently Asked Questions
What is a good APY in 2026?
Anything above 4.0% APY on a HYSA is competitive in 2026. The very top of the market sits between 4.5% and 5.0% APY, while the national average is closer to 0.40%.
Does APY change?
On variable-rate products like HYSAs and money market accounts, yes. The bank can change the APY at any time, often in response to Federal Reserve moves. CDs lock the APY for the full term.
How is APY interest taxed?
Interest earned on APY-paying accounts is taxed as ordinary income in the year it is credited. The bank sends a 1099-INT for any year you earn $10 or more in interest.
Can APY be negative?
In the U.S., no. Banks must pay APY of at least 0% on deposit accounts. Some foreign banks have offered negative APY at points in the past decade as a monetary policy tool.
Does compounding frequency really matter?
A little. Daily compounding adds about 0.01 to 0.02 percentage points to the effective APY versus monthly compounding at the same simple rate, which is meaningful only on large balances over many years.
