A $1,000 deposit could earn about $35 in interest in a year, if you put it in a high-yield savings account with a 3.50% APY. The amount of interest your money earns depends on the bank account and its APY. In a brick-and-mortar savings account with a 0.30% APY, a $1,000 deposit would only earn about $3. Savings rates can -- and do -- go up and down. These changes will affect the amount of interest you earn.