Best high-yield savings interest rates today, September 28, 2025 (Earn up to 4.25% APY)

Overview of Savings Interest Rates - The national average savings account rate is currently 0.40%, a significant increase from 0.06% three years ago [2] - Some of the best savings rates available today exceed 4% APY, with the highest being 4.25% APY offered by Poppy Bank as of September 28, 2025 [3] Interest Earnings from Savings Accounts - The interest earned from a savings account is determined by the annual percentage rate (APY), which accounts for the base interest rate and compounding frequency [3] - For an average interest rate of 0.40% with daily compounding, a $1,000 deposit would yield $4.01 in interest after one year, resulting in a total balance of $1,004.01 [4] - In contrast, a high-yield savings account with a 4% APY would grow a $1,000 deposit to $1,040.81, earning $40.81 in interest over the same period [4] Impact of Deposit Amount on Interest Earnings - The amount deposited in a savings account directly affects the interest earned; for example, a $10,000 deposit in a high-yield savings account at 4% APY would result in a total balance of $10,408.08 after one year, earning $408.08 in interest [5]