How Are High Yield Savings Accounts Calculated

High yield savings accounts (HYSA) offer higher interest rates than traditional savings accounts, but understanding how they're calculated requires knowing the difference between APR and APY, how compounding works, and the fees involved.

How Banks Earn Yield

Banks earn their yield through several methods:

Interest on deposits: The primary way banks earn yield is by paying interest on customer deposits.
Investment income: Banks invest a portion of deposits in short-term securities to earn additional income.
Loan origination fees: Banks charge fees when customers open new accounts or take out loans.
Service fees: Some banks earn yield by charging monthly maintenance fees on certain accounts.

While HYSAs offer higher rates than traditional savings accounts, they often come with fees or restrictions that may reduce your overall return.

APR vs APY

The key difference between APR (Annual Percentage Rate) and APY (Annual Percentage Yield) is how they account for compounding interest:

APR is the simple annual interest rate, calculated as:

APR = (Interest Earned / Principal) × 100

APY accounts for compounding and is calculated as:

APY = (1 + (Interest Earned / Principal))^(Number of Compounding Periods) - 1

For example, a 1% APR with monthly compounding would result in an APY of approximately 1.01%. The difference becomes more significant with higher rates or more frequent compounding.

Compounding Interest

Compounding interest means your interest earns interest, which can significantly increase your balance over time. The formula for compound interest is:

A = P(1 + r/n)^(nt)

Where:

A = the future value of the investment/loan, including interest
P = the principal investment amount
r = the annual interest rate (decimal)
n = the number of times that interest is compounded per year
t = the time the money is invested or borrowed for, in years

For example, $1,000 at 1% APR compounded monthly for 1 year would grow to approximately $1,010.17, while the same amount at 1% APY would grow to $1,010.00.

Fees and Risks

While HYSAs offer higher rates, they often come with fees and restrictions:

Minimum balance requirements: Many HYSAs require you to maintain a minimum balance to earn the full interest rate.
Monthly maintenance fees: Some accounts charge fees if your balance falls below the minimum.
Withdrawal limits: HYSAs typically limit the number of withdrawals per month.
FDIC insurance: All HYSAs are FDIC-insured up to $250,000 per depositor.

Before opening a HYSA, carefully review the terms and conditions to understand all fees and restrictions.

Comparison Table

Feature	Traditional Savings	High Yield Savings
Typical APR	0.01% - 0.50%	1.00% - 5.00%
Minimum Balance	$0	$100 - $1,000
Withdrawal Limits	6/month	3-6/month
Fees	None	$0 - $12/month
FDIC Insurance	Up to $250,000	Up to $250,000

Frequently Asked Questions

What is the difference between APR and APY?

APR is the simple annual interest rate, while APY accounts for compounding and shows the actual return you'll earn over time.

How does compounding interest work?

Compounding interest means your interest earns interest, which can significantly increase your balance over time. The more frequently interest is compounded, the higher your balance will grow.

What fees should I watch out for with HYSAs?

Watch for minimum balance requirements, monthly maintenance fees, and withdrawal limits. Some accounts may also charge fees for certain transactions.

Are HYSAs safe?

Yes, all HYSAs are FDIC-insured up to $250,000 per depositor, just like traditional savings accounts.